TEKELEC
10-K, 1999-03-31
RADIO & TV BROADCASTING & COMMUNICATIONS EQUIPMENT
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<PAGE>   1
                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                    FORM 10-K
                ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF
                       THE SECURITIES EXCHANGE ACT OF 1934

FOR THE FISCAL YEAR ENDED DECEMBER 31,1998       COMMISSION FILE NUMBER 0-15135

                                     TEKELEC
             (Exact name of registrant as specified in its charter)

          CALIFORNIA                                           95-2746131
  (State or other jurisdiction of                           (I.R.S.Employer
  incorporation or organization)                          Identification Number)

               26580 WEST AGOURA ROAD, CALABASAS, CALIFORNIA 91302
               (Address of principal executive offices) (Zip Code)

       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (818) 880-5656
        SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT: NONE
           SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:

                        COMMON STOCK, WITHOUT PAR VALUE
                                (Title of class)

         Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.

Yes [X]        No [ ]


         Indicate by check mark if disclosure of delinquent filers pursuant to
Item 405 of Regulation S-K is not contained herein, and will not be contained,
to the best of registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K. [ ]


         The aggregate market value of the voting stock held by non-affiliates
of the registrant, based upon the last reported sale price of the Common Stock
on March 1, 1999 as reported on The Nasdaq Stock Market, was approximately
$486,000,000.

         The number of shares outstanding of the registrant's Common Stock on
March 1, 1999, was 54,515,592.

                       DOCUMENTS INCORPORATED BY REFERENCE

         Portions of the registrant's definitive Proxy Statement to be delivered
to shareholders in connection with their Annual Meeting of Shareholders to be
held on May 14, 1999 are incorporated by reference into Part III of this Annual
Report.

<PAGE>   2

                                     TEKELEC
                      INDEX TO ANNUAL REPORT ON FORM 10-K
                  For the fiscal year ended December 31, 1998

<TABLE>
<CAPTION>
                                                                                Page
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<S>        <C>                                                                  <C>
                                  PART I
Item 1.    Business..........................................................     3
Item 2.    Properties........................................................    23
Item 3.    Legal Proceedings.................................................    23
Item 4.    Submission of Matters to a Vote of Security Holders...............    23

                                  PART II

Item 5.    Market for Registrant's Common Equity and Related
           Stockholder Matters...............................................    24
Item 6.    Selected Consolidated Financial Data..............................    25
Item 7.    Management's Discussion and Analysis of Financial Condition
           and Results of Operations.........................................    26
Item 7A.   Quantitative and Qualitative Disclosures about Market Risk........    36
Item 8.    Financial Statements and Supplementary Data.......................    36
Item 9.    Changes in and Disagreements with Accountants on Accounting
           and Financial Disclosure..........................................    36

                                 PART III

Item 10.   Directors and Executive Officers of the Registrant................    37
Item 11.   Executive Compensation............................................    37
Item 12.   Security Ownership of Certain Beneficial Owners and Management....    37
Item 13.   Certain Relationships and Related Transactions....................    37

                                  PART IV

Item 14.   Exhibits, Financial Statement Schedules, and Reports on Form 8-K..    38
</TABLE>



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                                     PART I

ITEM 1.  BUSINESS.

         Tekelec (the "Company") designs, manufactures and markets innovative
switching solutions and diagnostic systems for the global communications
marketplace. Tekelec's solutions enable both traditional carriers and new
emerging carriers to rapidly deliver advanced communications products and
services in order to compete in today's fast-evolving public communications
network environment.

         The Company's EAGLE(R) STP switching platform enables operators of
wireline and wireless networks to deliver Intelligent Network (IN) and Advanced
Intelligent Network (AIN) services such as Caller ID, voice messaging, personal
number calling, Service Provider Local Number Portability and customized routing
and billing, as well as digital wireless services such as Personal
Communications Systems (PCS) and Global Systems for Mobile (GSM). Derived from
the EAGLE switching platform, the Company's IP7(TM) suite of products enables
traditional carriers and new entrants to pursue cost-reduced and
performance-enhanced network architectures based on Internet Protocol (IP),
Asynchronous Transfer Mode (ATM) or other "packet" technologies.

         The Company's switching products have been sold primarily to U.S.
Regional Bell Operating Companies (RBOCs), competitive local exchange carriers
(CLECs), interexchange carriers (IXCs), PCS and cellular operators,
international Postal Telephone and Telegraph Companies (PTTs) and independent
telephone companies (ITCs).

         Switching products have been sold primarily through the Company's U.S.
direct sales force. In order to pursue emerging opportunities in Europe, the
Company established in 1998 a sales, marketing and support office in London. In
addition to the Company's direct sales efforts, the Company markets its
switching products through reference relationships with the Company's diagnostic
distributor base, and to a lesser extent through various third-party
distribution and marketing relationships.

         The Company's MGTS and Chameleon diagnostic product lines enable
carriers and communications equipment suppliers to ensure conformance to
specifications and to evaluate network performance in controlled environments,
without subjecting "live" networks to risk. Introduced in 1998, the MGTS
Sentinel(TM) enables carriers to monitor the performance of in-service networks.

         The Company sells its diagnostic systems worldwide to long distance
carriers, telephone operating companies, communications equipment manufacturers,
wireless and cellular network operators and government agencies. The MGTS, MGTS
Sentinel and Chameleon products are sold through the Company's direct sales
force and through its global distributor network. 



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INDUSTRY BACKGROUND

         The telecommunications industry has experienced and is continuing to
experience rapid and dynamic changes resulting from deregulation and, more
importantly, significant advances in switching technologies that, until
recently, were applied only in data networks. The migration of these data
technologies to the Public Switched Telecommunications Network (PSTN) is
commonly referred to as "convergence", and frequently includes a reference to
voice telephony over Internet Protocol or voice telephony over Asynchronous
Transfer Mode.

         Convergence generally includes telecommunications carriers' objective
to channel traditional circuit-based voice switching technologies over more
technologically efficient and cost-effective packet-switched technologies.
Ideally, true convergence would allow carriers to use identical network
architectures and infrastructure to accommodate traditional voice traffic and
rapidly growing data payloads.

         For more than a century, engineering the PSTN has revolved primarily
around voice call statistics. Measurements such as average call duration,
percentage of local calls versus long distance, and the distribution of calls
throughout each day have historically determined the size of switching devices
and the transmission paths to facilitate them. A measurable change in any of
these statistics would significantly affect the capability of the network to
perform as expected.

         The vast majority of PSTN communications paths in today's network are
circuit-oriented. Consequently, for the duration of the call dialogue, the
circuit connecting users of the network is considered dedicated to that dialogue
and a certain unit of bandwidth is consumed for the duration of the call. This
model is known as circuit-switched communications, wherein a physical circuit is
completely dedicated to the transmission.

         An alternative model of communications is the "packet switched" model.
Under this model, communications are packaged in discrete units and routed on a
packet-by-packet basis. Packet switching is significantly more cost- and
material-efficient than circuit switching in that packets are not exchanged when
the dialogue is not active. Industry research suggests that transmitting the
same amount of "data" via packet-switching technologies would prove more
efficient than traditional circuit switching by at least one order of magnitude.

         Even though the core of some voice transmission networks is "packet
oriented," these networks still do not benefit from the full advantages of
completely packetized networks. The maximum benefit of end-to-end packet
switching will only be realized when the switching components (versus the
transmission components) in today's networks are migrated from circuit switch
technology to packet switch technology.

         While the critical elements of the future converged voice and data
networks have yet to be defined, most industry experts expect a highly complex
protocol called Common Channel Signaling System #7 ("SS7") to play a key
enabling role in their deployment.



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<PAGE>   5

Intelligent Network and Advanced Intelligent Network Switching

         The Intelligent Network (IN) utilizes SS7 to provide the basis for
virtually all new telecommunications services. The IN architecture uses two
separate but parallel paths; one to handle the voice or data traffic and a
second to carry the signaling information for call set up and routing. Network
operators utilize the IN architecture to increase the efficiency of their
networks by offloading signaling traffic onto the SS7 network, thus freeing up
trunk line capacity needed for revenue generating traffic.

         A second generation Intelligent Network called the Advanced Intelligent
Network (AIN) is used by carriers and service providers seeking to differentiate
themselves by offering advanced voice and data communications services. The AIN
is a network architecture and a set of standards designed to allow network
operators to create, deploy and modify these services quickly and economically.
AIN services represent the merging of telephony with database information
through SS7 signaling. Such services include Caller ID, voice messaging,
personal number calling, Service Provider Local Number Portability and
customized routing and billing as well as digital wireless services such as PCS
and GSM.

         Network operators are increasingly using SS7 networks as a source of
competitive advantage to introduce new services through software changes in IN
elements rather than in central office switches. The key network elements in the
IN and AIN architecture are as follows:

               Signal Transfer Point (STP) - An STP is a switch that handles the
signaling messages used to set up telephone calls, queries external databases
for routing and processing information and dispatches call handling
instructions.

               Service Switching Point (SSP) - An SSP is a component of the
central office switch that sets up trunk connections. When an SSP identifies an
AIN call, it routes a signaling message to the STP and awaits further
instructions for call processing.

               Service Control Point (SCP) - Traditionally, an SCP has been a
computer database that is accessed by STPs or SSPs for customer call routing and
other special information required for AIN services. The Company has developed
applications that integrate SCP functionality into the EAGLE STP, such as the
Company's EAGLE STP / LNP product.

         Additional components of the AIN architecture include Service Creation
Environments (SCE) used to create new software-based services and Service
Management Systems (SMS) used for billing, administration and management.

         While SS7 has been available since the 1980s, to date it has been used
principally to support intelligent services such as call set-up, 800 number
calling and calling card verification. AIN standards and services have only
recently emerged and the number and complexity of these services continue to
grow. Services such as Caller ID, voice messaging, personal number calling,
Service Provider Local Number Portability and customized routing and billing as
well as digital wireless services such as PCS and GSM all require SS7 networking
technology. The growth of the Internet has also increased the need for SS7 to
provide signaling connectivity for 



                                       5
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evolving networks based on Internet Protocol (IP) and Asynchronous Transfer Mode
(ATM) and to implement internet offload solutions to carry internet traffic more
efficiently.

         The accelerating rate of introduction of these new enhanced services
enabled by SS7 has placed increasing demand for functionality and capacity on
the installed base of older generation STPs. These devices are, in most cases,
modified central office digital switches that fundamentally were not optimized
for AIN purposes. In addition, the telecommunications industry is evolving
towards an architecture of more intelligent distributed switching in which
software will allow for third party developers to be involved in creating
applications.

         The FCC's June 1996 order requiring that Incumbent Local Exchange
Carriers (ILECs) provide competitors with the ability to transition customers to
their networks without changing the customer's existing telephone number (i.e.,
Service Provider Local Number Portability) is having a dramatic impact upon the
SS7 network and telecommunications network service providers.

         With competition among network operators accelerating the deployment of
AIN services, the strategic and economic value of sophisticated switching
equipment optimized for SS7 applications is rapidly increasing. In addition, the
importance of SS7 network-to-network operators mandates extremely high
reliability and fault tolerance from the equipment as well as higher throughput
and scaleability to support the rapid and unpredictable growth in enhanced AIN
services. Companies that offer SS7-based products that are built on scaleable,
open distributed architectures, enable AIN applications, or offer integrated,
multi-service platforms such as the EAGLE STP / LNP solution, can benefit from
this industry shift.

Diagnostic Tools

         The proliferation of standards and protocols, growth of the Internet
and Intranet and the increasing complexity of communications equipment and
networks are creating a need for new, more sophisticated diagnostic systems
capable of simultaneously testing multiple existing and emerging technologies.
Network operators use diagnostic tools to efficiently monitor network
performance, simulate network services and test interoperability of equipment.
In an increasingly competitive environment, network operators need diagnostic
systems that can reduce time to market by shortening the testing cycles
necessary to model and implement new services. In addition, network operators
require advanced diagnostic solutions that verify reliability of network
elements, offer flexibility to support new standards and protocols as they
emerge and enable them to centralize the testing expertise within their
organizations.

         Equipment manufacturers use diagnostic tools to design and test their
products, such as switches, hubs and routers, for conformance to new and
existing standards and to simulate network operating conditions. Manufacturers
seek diagnostic tools that enable them to shorten their product development
cycles and reduce their testing costs as these elements are principal
contributors to product development time and expense. Furthermore, diagnostic
tools with a flexible architecture are necessary to accommodate the rapid
changes in technology.



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<PAGE>   7

PRODUCTS

Network Switching Products

         EAGLE STP. The Company introduced the EAGLE STP in early 1992. The
EAGLE STP is designed to meet the demands of SS7 switching and features a fully
distributed, standards-based open architecture. Its distributed open
architecture, high capacity and throughput are tailored to the SS7 switching
needs of common carriers, local exchange carriers, PCS and cellular operators
and IP-based carriers. The EAGLE STP is economically scaleable in configurations
from 2 to 500 links. Ongoing software releases provide continual product
improvement to meet the evolving needs of end users. As is required in SS7
networks, the EAGLE is sold and deployed in pairs, for redundancy. The EAGLE has
the following features:

         Designed for SS7 Standards. The EAGLE STP is designed to exceed the
requirements for STPs as defined by Bell Communications Research (Bellcore) and
presently supports both American National Standards Institute (ANSI) and
International Telephone and Telegraph Consultative Commission (CCITT) SS7
standards. Bellcore defines the standards used primarily by the RBOCs for
equipment used in their networks. See "Sales, Marketing and Support."

         Powerful, Distributed Architecture. The EAGLE STP features a fully
distributed, open architecture, utilizing Intel x86 microprocessors. The
performance of the product results from its uniquely distributed architecture
and the elimination of central processors. In the EAGLE STP, all SS7 network
intelligence, including SS7 routing information, is distributed among up to 250
signaling interface processors. Each interface is interconnected via a
high-speed, redundant bus subsystem. The bus subsystem utilizes two
counter-rotating 125 Mbps buses and features proprietary switching and buffering
algorithms, which minimize collision and guarantee message delivery between all
attached interfaces. All interfaces attached to the bus subsystem are
hot-swappable, so that interface repair or replacement does not affect system
operation.

         Software Architecture. The EAGLE STP's software is fully modular and
written entirely in industry-standard programming languages. All software is
released in complete versions, eliminating the need for interim patching and
minimizing the potential for errors. EAGLE STP software is optimized for the
capacity and redundancy features of the host hardware.

         Open Software Interfaces. Users of the EAGLE STP can rapidly add new
functionality and value-added services to their network, utilizing the EAGLE
STP's open software interfaces. Features enabling these open interfaces include:
STP LAN, which allows users to attach inexpensive general purpose computers to
the EAGLE for network analysis; Database Transport Access, which allows users to
change the behavior of protocols in their network without relying on the
vendor's development cycles; and X.25 to SS7/IS.41 Protocol Conversion which
allows first-generation legacy cellular switches to interwork with the more
advanced SS7 cellular network. A significant capability enabling Service
Provider Local Number Portability on the EAGLE allows carriers to eliminate the
need for significant numbers of dedicated Service Control Point (SCP) general
purpose computers.



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         Ease of Operation and Maintenance. EAGLE STP installations generally do
not require any enhancements to the central office's power supply, cooling
system or flooring and require less than 36 square feet of space. An EAGLE STP
can usually be installed in less than one week. No scheduled maintenance is
required to support the EAGLE STP, eliminating the requirement for on-site
personnel.

         Prices for a pair of EAGLE STPs typically range from approximately
$250,000 to $5,000,000, depending on configuration and associated software
applications.

Network Diagnostics Products

         Equipment manufacturers and network service providers utilize Tekelec's
diagnostic products to perform a wide variety of test applications that
simulate, monitor and analyze network communications infrastructures. The
Company's proprietary simulation language enables the controlled imitation of
communications devices and nodes in conjunction with variable traffic loads. Its
analysis software packages support full-rate monitoring, selective capture and
triggering of digitized pulses transmitted through a network. Uses of the
Company's diagnostic products include the following:

         - Designing Communications Equipment. By simulating existing and
emerging communications devices and nodes (e.g., digital switches, STPs, SCPs,
routers and intelligent hubs) and protocols (e.g., IP, ATM, High-Speed Frame
Relay, SS7, Fast Ethernet, SMDS, ISDN, FDDI, BERT and Token Ring), the Company's
products enable engineers to quickly design communications devices that will
transition seamlessly into emerging network infrastructures, minimizing
potential breakdowns of network components deployed throughout the network.

         - Ensuring Product Reliability. By simulating actual network conditions
within an operating environment, including protocol errors and other network
failures, the Company's products can help ensure that communications equipment
manufacturers produce devices that will operate error-free, thus accelerating
time to market and potentially reducing costly failures after installation.

         - Verifying Certification. By executing conformance and performance
test suites, network operators and manufacturers use the Company's products to
rapidly verify that communication devices meet specified standards (e.g., IP,
ATM, Frame Relay, SS7, ISDN and BERT).

         - Monitoring Networks. By collecting and analyzing traffic, the
Company's products can monitor the health of networks on a continuous basis and
provide advance notice of potential system failures, allowing quicker service
restoration or even service failure prevention.

         - Troubleshooting. By identifying the specific location and type of
communication error, the Company's products can isolate which network device has
failed (e.g., router, intelligent hub, switch port, edge switch). The Company's
products help technicians and engineers repair devices and networks promptly and
minimize expensive downtime associated with service failure.



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<PAGE>   9

         The Company's principal intelligent network diagnostic products are
described below.

         MGTS. The MGTS system is used primarily for SS7-based device
simulation, load generation and network monitoring. In its fully configured
form, the system includes Tekelec's proprietary programming tool, PASM, that can
be used to design customized testing scenarios. The MGTS software runs on Sun
Microsystems and Hewlett-Packard UNIX operating systems with an X-Windows, Motif
graphical user interface. The MGTS system supports a number of protocols,
including SS7, AIN, GSM, IS.41, CDMA and PCS. The system is scaleable and can
support any number of links with multiple systems and can be networked over
large geographical areas.

         MGTS Companion(TM). The compact and portable MGTS Companion takes the
power and capabilities of the lab-based MGTS to the field. It is used by field
technicians in first office application testing, equipment installation
acceptance testing and complex signaling systems integration. MGTS companion
also enables sophisticated field-based troubleshooting of installed signaling
products. With PASM, MGTS Companion enables field technicians to either develop
custom test scenarios, or use scenarios that were designed in the lab, to
simulate or test intelligent network services for wireline and wireless
networks. MGTS Companion is also used to test roaming and other GSM network
services.

         MGTS Sentinel(TM). Introduced in mid-1998, MGTS Sentinel is a complete
network maintenance and diagnostic system that provides telephony operators
total visibility of and access to their SS7 networks. MGTS Sentinel includes
network surveillance capabilities and fault-management functions. It provides a
combination of passive monitoring and proactive testing capabilities that enable
service providers to perform problem detection and analysis as well as verify
fixes from a centralized location on a single platform. In addition to reducing
operations costs, MGTS Sentinel enables network operators to enhance the quality
of the services they provide. It also has an open interface to accommodate
additional applications such as those used for fraud prevention, billing
verification, and quality of service measurement.

         The Company's principal data network diagnostic products are described
below.

         Chameleon(R) Open. The Chameleon Open is a multiprotocol communications
analyzer that features a flexible modular architecture, multiple LAN, MAN, WAN
and GAN technologies and protocols, simultaneous interoperability between
different technologies, and full bandwidth capabilities from low data
transmission rates to high-speed optical interfaces. Technologies supported
include ATM, SMDS, High-Speed Frame Relay, FDDI, ISDN, WAN DS-1/E1, Fast
Ethernet, Ethernet, BERT and Token Ring. The Chameleon Open's user-friendly
interface allows customers to quickly diagnose their network or switch
performance and detect any upper layer violations within the protocol stack
utilized within the network or switch fabric. The Chameleon Open's products are
available in two configuration options: portable 6 slot test application
(Chameleon Open) or the rack-mounted 12 slot test application (Chameleon
Open-X). Each Chameleon Open product operates with the same hardware and
software packages, and thus provides customers with the most flexible test
applications for portability and remote testing.



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         Chameleon 32+. The Chameleon 32+ protocol analyzer supports a variety
of protocols and technologies including SS7, ISDN, IS-41, X.25/X.75, SNA and
Frame Relay, enabling network operators as well as equipment manufacturers to
perform active network diagnostics, troubleshoot network or device problems on
existing network equipment and validate new equipment being developed. The
Chameleon 32+ can be utilized for extensive monitoring and simulation testing
for a wide array of protocols and interfaces including: X.25, X.75, QLC, PSH,
SNA, Async, Bisync, ISDN, SS7, IS-41, OSI, DPNSS, DASS 2, DMI, V.120, DDCMP, U
Interface, Frame Relay, ASAI, SCAI, Digital Test Access and BERT.

         List prices for the Company's principal diagnostic products for
equipment design and test range from approximately $50,000 to $200,000,
depending on configuration. List prices for the Company's principal diagnostic
products for network monitoring and maintenance range from approximately $50,000
to $2,000,000, depending on configuration.

         Compliance with Industry Standards

         The Company's products are designed to meet a significant number of
standards and regulations, some of which are evolving as new technologies are
deployed. In the United States, the Company's products must comply with various
regulations defined by the FCC and Underwriters Laboratories as well as
standards established by Bellcore and the ANSI. Internationally, the Company's
products must comply with standards established by telecommunications
authorities in various countries as well as with recommendations of the CCITT
and the International Standards Organization (ISO). The failure of the Company's
products to comply, or delays in compliance, with the various existing and
evolving standards could have a material adverse effect on the Company's
business and operating results.

PRODUCT DEVELOPMENT

         The communications market is characterized by rapidly changing
technology, evolving industry standards and frequent new product introductions.
Standards for new services such as AIN, PCS, IP and ATM are still evolving. As
these standards and the demand for services and applications evolve, the Company
intends to adapt its products or develop and support new products. The Company
solicits product development input through discussions with users of the
Company's products and participation in industry organizations and international
standards committees, such as the Telecommunications Industry Association (TIA)
and the ATM Forum, and by closely monitoring the activities of the ITU, ETSI,
ISO and Bellcore.

         The Company's network switching product development group is
principally focused on the release of new software versions to incorporate
enhancements or new features desired by customers and compliance with standards
to enable EAGLE to address additional domestic and international markets. In
addition, the Company plans continued improvement of hardware components to
improve performance and capabilities.

         The Company's diagnostic product development activities are principally
focused on expanding the capabilities of the MGTS and Chameleon products,
including their interfaces, software modules and protocol capabilities for
emerging technologies such as AIN and ATM, and adapting these products for the
emerging network operations market. From time to time the 



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Company engages in development projects for special applications for customers.
The Company typically retains the right to use such technology in future
products that are not competitive with the specific application for which the
development work was performed.

         The Company utilizes a common standards-based open architecture
approach in the design of its products. This approach facilitates and
accelerates the development of new applications and products and permits the
Company to enhance existing products by substituting new hardware or software
modules. This modular approach also helps to extend the life cycles of the
Company's products, ensure compatibility among successive generations of
products and simplify manufacturing.

         The Company's success depends, to a substantial degree, upon its
ability to respond rapidly to changes in technology, industry standards and
customer requirements. This requires the timely selection, development and
marketing of enhancements and new products on a cost-effective basis. The
Company has invested and expects to continue to invest substantial resources in
the development of new products and technology and product enhancements. There
can be no assurance that the Company's product development efforts will result
in commercially successful new or enhanced products or that the Company's
products will not be rendered obsolete or noncompetitive by changing technology
or new competitive products.

         Products as complex as those offered by the Company may contain
undetected errors or failures when first introduced or as new versions are
released. Such errors have occurred in the past. Although the Company's products
have not experienced any significant errors, such errors, particularly those
that result in a failure of the Company's switching products, could have a
material adverse effect on the Company's customer relationships, business and
operating results. There can be no assurance that, despite thorough testing by
the Company and by customers, errors will not be found in the Company's
products.

         Product development includes expenditures for research and development,
new product design, enhancement of existing products and selective acquisition
of technology. Research and development expenses amounted to approximately $26.4
million, $21.0 million and $17.1 million in 1998, 1997 and 1996, respectively.
See "Management's Discussion and Analysis of Financial Condition and Results of
Operations."

         The Company's development facilities are located in California, North
Carolina, Washington and Japan. As of March 1, 1999, the Company had 243 persons
engaged full time in product development. The Company believes that recruiting
and retaining highly skilled engineering personnel is essential to its success.
To the extent that the Company is not successful in attracting and retaining its
technical staff, its business and operating results would be adversely affected.

SALES, MARKETING AND SUPPORT

         The Company's sales and marketing strategy for its EAGLE switching
product is to continue to focus on sales to the traditional circuit-based
telephony markets and to expand into the emerging packet-based telephony
networks with new products and applications. The Company also intends to expand
its international presence through additional sales personnel and



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product enhancements targeted to the international market. Current and future
strategic alliances will continue to be an integral component of the strategy to
reach broader markets and attain greater market presence. The network switching
sales cycle typically ranges from three to 18 months depending on the complexity
of a customer's planning, bidding and implementation requirements.

         RBOCs and other large service providers require their suppliers to
continuously participate in Bellcore Technical Auditing programs as new hardware
and software features are introduced. Bellcore provides Technical Auditing
Services ("technical audits") to suppliers of network equipment assessing the
supplier's conformance to certain Bellcore standards which have been adopted by
RBOCs and other service providers. Ongoing technical audits of the EAGLE STP are
conducted by Bellcore and the results of these audits are available to the
Company and its customers. Bellcore does not endorse or certify any product or
service or guarantee its performance. Failure or delay in obtaining favorable
technical audit results could have a material adverse effect on the Company's
ability to sell its EAGLE STP to this large segment of the communications
carrier market.

         The Company's sales and marketing strategy for its MGTS Sentinel
product is to focus on sales to the traditional circuit-based telephony markets
and to expand into the emerging packet-based telephony networks with new
products and applications. The Company also intends to expand its international
presence through additional sales personnel and product enhancements targeted to
the international market.

         The Company's sales and marketing strategy for its other diagnostic
products is to initially target customers' research and development departments
designing the next generation of communications equipment and then to target the
manufacturing groups and ultimate users in network operations as equipment is
manufactured, certified and installed. This strategy permits the Company to gain
expertise in testing emerging technologies in the early stages of their life
cycles.

         Domestic Distribution. The Company sells its switching and diagnostic
products in the U.S. principally through separate direct sales forces and, for
the EAGLE STP to a lesser extent, through strategic relationships with various
third-parties. The Company's direct sales forces operate out of the Company's
headquarters in Calabasas, California and its regional offices located in
Colorado, Illinois, New Jersey, North Carolina, Northern California and Texas.

         International Distribution. The Company sells its switching products
internationally through its direct sales force and a distributor in Korea. The
Company sells its diagnostic products internationally through a network of 30
distributors and a wholly owned subsidiary in Japan. The Company's Japanese
subsidiary, which presently sells only diagnostic products, generated
approximately 12%, 13% and 22% of the Company's revenues for 1998, 1997 and
1996, respectively. During 1998, the Company formed a subsidiary in the United
Kingdom to conduct sales and marketing activities primarily for switching
products.



                                       12
<PAGE>   13

         Tekelec-Airtronic, S.A., an affiliate of the Company, and its wholly
owned subsidiaries are the distributors of the Company's diagnostic products in
France, Italy, Germany, the Netherlands, Belgium, Luxembourg, Portugal, Spain
and China. Twenty four additional independent companies distribute the Company's
products in other Western European countries, the Far East (other than Japan),
Australia, Mexico, Puerto Rico, New Zealand, Latin America, the Middle East and
South Africa. Distributors typically purchase products directly from the Company
pursuant to agreements that are exclusive for a particular territory and are
cancelable by either party upon 90 days notice. Export sales through
international distributors accounted for approximately 7%, 10% and 13% of
revenues in 1998, 1997 and 1996, respectively.

         The Company typically invoices export sales in U.S. dollars and its
foreign subsidiary invoices sales in its local currency. International sales are
subject to inherent risks, including longer payment cycles, unexpected changes
in regulatory requirements and tariffs, difficulties in staffing and managing
foreign operations and distributors, greater difficulty in accounts receivable
collection and potentially adverse tax consequences. Additionally, exchange rate
fluctuations on foreign currency transactions and translations arising from
international operations may contribute to fluctuations in the Company's
business and operating results. Fluctuations in exchange rates could also affect
demand for the Company's products. In addition, due to the technical nature of
the Company's products, certain of the Company's export sales must be licensed
by the Office of Export Administration of the U.S. Department of Commerce. The
Company's products are subject, in certain international jurisdictions, to
reduced protection for the Company's copyrights and trademarks. See Notes A, D
and M to consolidated financial statements.

         Strategic Relationships. The Company believes that it can improve
market penetration and acceptance for its EAGLE products through strategic
relationships with leading communications equipment suppliers. These suppliers
have long-standing relationships with public carriers and provide a broad range
of services to these carriers through their existing sales and support networks.
Tekelec seeks strategic relationships that (i) enhance the Company's presence in
its target markets, (ii) offer products that complement the EAGLE to provide
value-added networking solutions and (iii) leverage the Company's core
technologies enabling the communications equipment suppliers to develop enhanced
products with market differentiation that can be integrated with the EAGLE
platform.

         The Company has a non-exclusive distribution agreement with Lucent, an
exclusive distribution agreement with Daewoo and a strategic marketing and sales
alliance with Bellcore under which the Company and Bellcore will jointly market
each other's products and also exchange interfaces and potentially other product
specifications to allow the interworking of the Company's EAGLE IP7 Gateway and
Bellcore's ISCP(R) System. The Company believes that these relationships
demonstrate recognition of the technical advantages of the EAGLE STP and IP7
products, and that these agreements provide the Company with additional
opportunities to penetrate the SS7 network switching marketplace and the
convergence market. Through the Company's relationships with Lucent, Daewoo and
Bellcore, the Company has enhanced its market presence and its ability to access
leading telephone companies. In general, these agreements can be terminated by
either party on limited notice and, except for Daewoo, do not require minimum
purchases. Furthermore, Lucent and Bellcore are not precluded from selling
products that are competitive with the Company's products. Although the
Company's current 



                                       13
<PAGE>   14

sales through its relationships with Lucent and Bellcore are not significant, a
termination of the Company's relationship with Lucent or Bellcore, or the sale
of competing products by Lucent or Bellcore, could adversely affect the
Company's business and operating results.

         Advertising and Promotion. The Company uses advertising in trade
journals, exhibitions at trade shows, a presence on the Internet via the World
Wide Web and direct mail to promote awareness of the Company and its products.
The Company has been most successful in generating sales through demonstrations
of its products and, therefore, focuses its advertising and promotional
activities on generating opportunities for demonstrations. The Company also
provides extensive training for, and merchandising aids to, its direct sales
force and distributors. These include sales brochures, demonstration systems and
promotional product literature.

         Services, Support and Warranty. The Company believes that customer
service, support and training are important to building and maintaining strong
customer relationships. The Company services, repairs and provides technical
support for its products. The Company maintains an in-house repair facility and
provides ongoing training and telephone assistance to customers and
international distributors from its headquarters in Calabasas, California,
certain U.S. regional offices and its Japanese subsidiary. The Company's
Technical Assistance Center in Morrisville, North Carolina, supports the
Company's switching products on a 24 hour-a-day, seven day-a-week basis. Support
services include 24-hour technical support, remote access diagnostic and
servicing capabilities, extended maintenance and support programs, comprehensive
technical customer training, extensive customer documentation, field
installation and emergency replacement. The Company typically warrants its
products against defects in materials and workmanship for one year after the
sale and thereafter offers extended service warranties. To date, warranty
expenses have been within management's expectations.

CUSTOMERS

         During 1998, the Company shipped approximately 62 pairs of EAGLE STPs
to 35 customers worldwide and 780 units of its diagnostic products to over 190
customers worldwide. The Company's customers include end users and marketing
intermediaries. End users for the Company's EAGLE STP consist primarily of U.S.
ITCs, PCS and cellular operators, interexchange carriers, competitive access
providers, local exchange carriers and RBOCs. End users for the Company's
diagnostic products include long-distance carriers, telephone operating
companies, communications equipment manufacturers, wireless and cellular network
operators and government agencies. No customer accounted for more than 10% of
the Company's revenues in 1998.

         The Company's diagnostic business is substantially dependent on repeat
business and, therefore, customer satisfaction and loyalty are crucial to its
long-term success. Many of the Company's largest customers in 1998 were
purchasers of the Company's diagnostic systems in prior years.

         Federal and state agencies, including the FCC, regulate many of the
Company's domestic customers. The FCC and a majority of the states have enacted
or are considering regulations based upon alternative pricing methods.
Uncertainty regarding future pricing policies and the cost effectiveness of
deploying public network services may affect demand for communications



                                       14
<PAGE>   15

products, including the Company's products. However, the Company believes that
deregulation of the telecommunications market and new methods of price
regulation as evidenced by the passage of the Telecommunications Act of 1996
could increase the demand for products such as those offered by the Company
which enhance the efficiency of the network or allow the expedited introduction
of new revenue-producing services.

BACKLOG

         Backlog for switching products typically consists of contracts or
purchase orders for both product delivery scheduled within the next 12 months
and EAGLE STP extended service warranty to be provided over the next five years.
Orders for the Company's diagnostic products are usually placed by customers on
an as-needed basis, and the Company has typically been able to ship these
products within 15 to 30 days after acceptance of the purchase order. Because of
variations in the magnitude and duration of orders received by the Company, and
customer delivery requirements, which may be subject to cancellation or
rescheduling by the customer, the Company's backlog at any particular date may
not be a meaningful indicator of future financial results. At December 31, 1998,
the Company's backlog amounted to approximately $72.8 million, of which $45.3
million related to EAGLE STP service warranty. This compared to a backlog of
$59.0 million at December 31, 1997, of which $28.7 million related to EAGLE STP
service warranty.

MANUFACTURING

         The Company's manufacturing operations consist of the procurement and
inspection of components, final assembly, burn-in, quality control testing and
packaging. Printed circuit boards, chassis and most of the other major
components used in the Company's products are subassembled to the Company's
specifications by independent contractors with whom the Company generally has
had long-standing working relationships. The assembled components are then
delivered to the Company's production facilities for final assembly, quality
control testing and product configuration, including software installation. The
Company's products incorporate the Company's proprietary software as well as
software licensed from third parties. The Company believes that its use of
independent contractors for subassembly coupled with in-house final assembly
improves production planning, increases efficiency, reduces costs and improves
quality.

         The Company has a computerized manufacturing inventory control system
that integrates and monitors purchasing, inventory control and production. The
Company's quality control process tests for reliability and conformance with
product specifications and utilizes certain automated software test procedures.
The Company received ISO 9002 certification from Bellcore in 1995, ISO 9001
certification from Bellcore for its network switching operations in 1996 and for
its intelligent network diagnostics operations in 1997.



                                       15
<PAGE>   16

         The Company has obtained CE Mark registration for its principal
diagnostic products and for its EAGLE STP to meet EC regulations for shipment of
products into Europe. As new hardware and software features or new products are
introduced, the Company routinely engages in the process of obtaining CE Mark
registration as needed. Failure or delay in the Company's ability to obtain CE
Mark registration for its products could have a material impact on future sales
in Europe.

         The Company generally uses industry standard components for its
products that are available from multiple sources; however, a few key
components, such as certain microprocessors, video displays and power supplies,
are currently only available from single suppliers. Vendor supply agreements
often include provisions requiring the vendor to maintain a specified level of
key components. The Company believes that inventory levels of key components,
including those maintained by vendors, are adequate. In addition, should any
components become unavailable the Company believes that functionally similar, if
not identical, components could be obtained, and any necessary internal redesign
accomplished, without materially adversely impacting the Company. To date, the
Company has not experienced any significant delays in obtaining components from
its suppliers and independent contractors. However, the electronics industry is
subject to rapid technological change. Components become obsolete and are
discontinued by manufacturers as new succeeding generations are introduced. An
inability to obtain essential components, if prolonged, could materially
adversely affect the Company's business and operating results and damage
customer relationships.

COMPETITION

         Network Switching Products. The market for STPs is highly competitive
and has been highly concentrated among a limited number of dominant suppliers.
The Company expects competition to increase in the future from existing and new
competitors. The Company presently competes with Alcatel Alstom S.A. and
Northern Telecom Ltd. and to a lesser extent with a limited number of other
manufacturers, all of which have significantly greater financial, marketing,
manufacturing and other resources and larger installed customer bases than the
Company. The Company believes that its long-term success will depend on its
ability to further penetrate the major telephone companies, both domestically
and internationally, offer products with the best price/performance profile and
be responsive to customers' needs for new features and services.

         The Company believes that the principal competitive factors in the
network switching products market are product price/performance characteristics
and reliability, customer service and support and the supplier's financial
resources, marketing and distribution capability. The Company anticipates that
responsiveness in adding new features will become an increasingly important
competitive factor. While the Company's competitors have greater financial
resources, the Company believes it competes favorably in other respects.
However, there can be no assurance that new entrants or established competitors
with greater financial resources have not or will not offer products superior in
performance, quality, service and support to, and/or lower in price than, those
of the Company.



                                       16
<PAGE>   17

         Diagnostic Products. The communications diagnostic market is intensely
competitive and subject to rapid technological change and evolving industry
standards. The Company primarily competes in the high performance segment of the
market. Its principal competitor is Hewlett-Packard. The Company also competes
with a number of other manufacturers, some of which have greater financial,
marketing, manufacturing and technological resources than the Company. The
Company believes that its long-term success will depend in part on its ability
to be a leader in offering products that address new emerging industry standards
and to offer a broad line of integrated applications.

         The Company believes that the principal competitive factors in the
communications diagnostic market in which the Company competes are product/price
performance, functionality and reliability, timely introduction of new products,
breadth of integrated product applications, marketing and distribution
capability and customer service and support. The Company believes that it
competes favorably, although there can be no assurance that new or established
competitors will not offer products superior to or lower in price than those of
the Company.

INTELLECTUAL PROPERTY

         The Company relies on a combination of patent, trade secret, copyright
and trademark laws and contractual restrictions to establish and protect
proprietary rights in its products. The Company has entered into confidentiality
and invention assignment agreements with its employees, and enters into
non-disclosure agreements with its suppliers, distributors and appropriate
customers among others so as to limit access to and use and disclosure of its
proprietary information. There can be no assurance that these statutory and
contractual arrangements will prove sufficient to deter misappropriation of the
Company's technologies or independent third-party development of similar
technologies. The laws of certain foreign countries in which the Company's
products are or may be developed, manufactured or sold may not protect the
Company's products or intellectual property rights to the same extent as do the
laws of the United States and thus make the possibility of misappropriation of
the Company's technologies and products more likely. The Company believes that,
because of the rapid pace of technological change in the communications market,
legal protections for its products are less significant factors in the Company's
success than the knowledge, ability and experience of the Company's employees,
the frequency and timely introduction of product enhancements and the quality of
support services provided by the Company.

         The communications industry is characterized by the existence of a
large number of patents and frequent litigation based on allegations of patent
infringement. From time to time, third parties may assert exclusive patent,
copyright, trademark and other intellectual property rights to technologies that
are important to the Company. There are no currently pending material claims
that the Company's products, trademarks or other proprietary rights infringe the
proprietary rights of third parties. However, there can be no assurance that the
Company will not receive communications from third parties in the future
asserting that the Company's products infringe or may infringe the proprietary
rights of third parties. In its distribution agreements and certain of its major
customer agreements, the Company agrees to indemnify its customers for any
expenses or liabilities resulting from claimed infringements of patents,
trademarks or copyrights of third parties. In the event of litigation to
determine the validity of any third-party claims, such litigation, whether or
not determined in favor of the Company, could result in significant expense



                                       17
<PAGE>   18

to the Company and divert the efforts of the Company's technical and management
personnel from productive tasks. In the event of an adverse ruling in such
litigation, the Company might be required to discontinue the use and sale of
infringing products, expend significant resources to develop non-infringing
technology or obtain licenses from third parties. There can be no assurance that
licenses from third parties would be available on reasonable commercial terms,
if at all. In the event of a successful claim against the Company and the
failure of the Company to develop or license a substitute technology, the
Company's business and operating results would be materially adversely affected.

EMPLOYEES

         At March 1, 1999, the Company had 581 employees, comprising 203 in
sales, marketing and support, 71 in manufacturing, 243 in research, development
and engineering and 64 in management, administration and finance. The Company
believes that its future success will depend in part on its ability to attract,
motivate and retain highly qualified personnel. Virtually all of the Company's
employees hold stock options and/or participate in an employee stock purchase
plan. None of the Company's employees is represented by a labor union, and the
Company has not experienced any work stoppages. The Company believes that its
employee relations are excellent.



                                       18
<PAGE>   19

                                    GLOSSARY


<TABLE>
<S>                                               <C>
AIN (Advanced Intelligent Network).............   Bellcore's set of standards for advanced
                                                  intelligent services for the telephone
                                                  networks of Regional Bell Operating
                                                  Companies.

ANSI (American National Standards
   Institute)..................................   The coordinating body for voluntary
                                                  standards groups within the United
                                                  States. ANSI is a member of the
                                                  International Organization for
                                                  Standardization (ISO).

ATM (Asynchronous Transfer Mode)...............   A broadband, low-delay, packet-based
                                                  switching and multiplexing technique.
                                                  Usable capacity is segmented into
                                                  fixed-size cells, consisting of header
                                                  and information fields, allocated to
                                                  services on demand.

BRI (Basic Rate Interface).....................   One interface type used to access the
                                                  Integrated Services Digital Network. The
                                                  BRI allows two simultaneous calls across
                                                  a single pair of copper wires.

CCITT (International Telephone and
   Telegraph Consultative Committee)...........   A United Nations organization that
                                                  establishes international
                                                  telecommunications standards.

El ............................................   The European telecommunications standard
                                                  defining circuits that operate at speeds
                                                  of 2.048 Mbps, similar to T1 lines in
                                                  the United States.

Ethernet.......................................   A standard set of specifications for a
                                                  particular type of LAN that employs
                                                  baseband signaling (single signal on a
                                                  cable) and has a transmission rate of 10
                                                  Mbps.

Fast Ethernet..................................   100 Mbps' technology for workstation
                                                  LANs from the eponymous Fast Ethernet
                                                  Alliance, which includes 3Com and
                                                  SynOptics. It has been adopted by the
                                                  IEEE as the basis for the 100BaseT
                                                  Ethernet standard.

FDDI (Fiber Distributed Data
   Interface)..................................   A standard for operating fiber
                                                  optic-based LANs at 110 Mbps used for
                                                  high speed and backbone applications.

Frame Relay....................................   A variable length packet-based
                                                  transmission technology that is used to
                                                  transmit data at speeds up to 2 Mbps.
</TABLE>



                                       19
<PAGE>   20

<TABLE>
<S>                                               <C>
GAN (Global Area Network)......................   A network of computers connected across
                                                  countries.


GSM (Global Systems for Mobile)................   The standard for a set of protocols for
                                                  digital wireless initially deployed in
                                                  Europe.

IN (Intelligent Network).......................   An out-of-band, packet switched overlay
                                                  network to the in-band Public Switched
                                                  Telephone Network (PSTN). The
                                                  Intelligent Network minimally consists
                                                  of SS7-equipped Central Offices (Service
                                                  Switching Points, or SSPs), packet
                                                  switches (Signal Transfer Points, or
                                                  STPs) and databases (Service Control
                                                  Points, or SCPs).

Internet.......................................   The worldwide system of linked networks
                                                  that is capable of exchanging mail and
                                                  data through a common addressing and
                                                  naming system based on TCP/IP protocols.

Intranet.......................................   A private network that uses Internet
                                                  software and standards.

ISDN (Integrated Services Digital
   Network)....................................   Public digital communications services
                                                  supporting a wide range of data, voice
                                                  and image services accessed by standard
                                                  interfaces integrated with customer
                                                  control.

IS.41..........................................   One of the Interim Standards for North
                                                  American mobile applications for digital
                                                  cellular.

LAN (Local Area Network).......................   A type of high-speed data communications
                                                  arrangement in which multiple computer
                                                  and related products in an office or
                                                  campus environment are connected by
                                                  means of a standard transmission medium
                                                  (typically coaxial cable, twisted-pair
                                                  wire or optical fiber).

MAN (Metropolitan Area Network)................   A high-speed network designed to link
                                                  together sites in a metropolitan or
                                                  campus area. The IEEE has defined its
                                                  802.6 standard for MANs based on the
                                                  Distributed Queue Dual Bus technology.


Mbps (Megabits per second).....................   A measurement unit, equal to 1,048,576
                                                  bits per second, used to describe data
                                                  transfer rates as a function of time.

MSC (Mobile Switching Center)..................   A switch that coordinates trunk call
                                                  set-up to and from users in a digital
                                                  cellular network.

Packet Switching...............................   A data transmission technique whereby
                                                  user information is segmented and routed
                                                  in discrete data envelopes called
                                                  packets, each with its own appended
                                                  control information for routing,
                                                  sequencing and error checking.
</TABLE>



                                       20
<PAGE>   21

<TABLE>
<S>                                               <C>
PCS (Personal Communications
   Systems)....................................   A set of evolving standards and
                                                  protocols providing for the concept of
                                                  one number per user and associated
                                                  advanced intelligent services regardless
                                                  of location primarily involving mobile
                                                  communications.

PDC (Personal Digital
   Communications).............................   A set of protocol standards for Japanese
                                                  digital cellular mobile network
                                                  promulgated by NEC.

Primary Rate Interface (PRI)...................   A T1 or E1 circuit used to carry 23 or
                                                  30 ISDN calls, respectively. In an ISDN
                                                  PRI, a single channel is used for
                                                  signaling for calls placed on all of the
                                                  other channels in the T1 or E1 circuit.

protocol.......................................   A formal set of standards governing the
                                                  establishment of a communications link
                                                  and controlling the format and timing of
                                                  transmissions between two devices.

RBOCs (Regional Bell Operating
   Companies)..................................   Telephone companies created in 1984 as a
                                                  result of the break-up of AT&T.

signaling......................................   The process by which digital information
                                                  is exchanged to establish, control and
                                                  manage connections in a network.

SCE (Service Creation Environments)............   An application in the Advanced
                                                  Intelligent Network which allows for the
                                                  development and customization of new
                                                  telephone services, utilizing Advanced
                                                  Intelligent Network (AIN) "building
                                                  blocks". Using customized Service
                                                  Information Blocks (SIBs) and
                                                  "triggers", users describe services such
                                                  as time-of-day routing. These
                                                  descriptions are loaded into Service
                                                  Control Points (SCPs) or Service Nodes
                                                  (SNs) for execution in the network.

SCP (Service Control Point)....................   A computer database that is accessed by
                                                  STPs for customer call routing
                                                  information and other special
                                                  information required for AIN services.

SMDS (Switched Multi-megabit Data
   Service)....................................   A communications service providing high
                                                  speed, connectionless data transport.

SMS (Service Management System)................   A proprietary application that provides
                                                  the user with a maintenance and
                                                  administration interface to various IN
                                                  and AIN network elements.

SP-LNP (Service Provider Local
   Number Portability).........................   A capability mandated by the Federal
                                                  Communications Commission in June, 1996
                                                  that allows telephone customers to
                                                  change their local service provider
                                                  without changing their telephone number.
                                                  Adding SP-LNP capabilities to the Public
                                                  Switched Telephone Network requires the
                                                  introduction of three new network
                                                  elements and new software capabilities
                                                  in virtually every existing network
                                                  element.
</TABLE>



                                       21
<PAGE>   22

<TABLE>
<S>                                               <C>
SS7 (Common Channel Signaling
   System No. 7)...............................   A complex protocol which governs
                                                  signaling between certain devices in a
                                                  digital telephone network.

SSP (Service Switching Point)..................   An SSP is a component of the central
                                                  office switch that sets up trunk
                                                  connections. When an SSP identifies an
                                                  AIN call, it routes a signaling message
                                                  to the STP and awaits further
                                                  instructions for call processing.

STP (Signal Transfer Point)....................   An STP is a switch that handles the
                                                  signaling messages used to set up
                                                  telephone calls, queries external
                                                  databases for routing and processing
                                                  information and dispatches call handling
                                                  instructions.

T1 ............................................   The North American telecommunications
                                                  standard defining a circuit that
                                                  multiplexes and switches 24 channels and
                                                  operates at speeds of 1.544 Mbps (T3 is
                                                  the equivalent of 27 T1 circuits).

TCP/IP (Transmission Control
   Protocol/Internet Protocol).................   The common name for the suite of
                                                  protocols developed by the U.S.
                                                  Department of Defense in the 1970s to
                                                  support the construction of world- wide
                                                  internetworks. TCP and IP are the two
                                                  best- known protocols in the suite. TCP
                                                  corresponds to Layer 4 (the transport
                                                  layer) of the OSI reference model. It
                                                  provides reliable transmission of data.
                                                  IP corresponds to layer 3 (the network
                                                  layer) of the OSI reference model and
                                                  provides connectionless datagram
                                                  service.

WAN (Wide Area Network)........................   A network that extends beyond the
                                                  distance that can be accommodated by
                                                  local cabling methods. A WAN typically
                                                  utilizes public carrier services to
                                                  connect sites, which may span a city,
                                                  state, country or the world.

xDSL...........................................   Another name for an ISDN BRI channel.
                                                  Operated at the Basic Rate Interface
                                                  (with two 64 kbps circuit switched
                                                  channels), the DSL can carry both voice
                                                  and data signals at the same time, in
                                                  both directions, as well as the
                                                  signaling data used for call information
                                                  and customer data.

X.25...........................................   A protocol for transfer of information
                                                  across packet data networks. X.25 was
                                                  the first packet data technology to be
                                                  widely implemented.
</TABLE>



                                       22
<PAGE>   23

ITEM 2.  PROPERTIES.

         The Company's executive offices, as well as its principal manufacturing
operations, are located in an approximate 58,000 square-foot facility in
Calabasas, California, under a lease that expires in November 2004 with an
option to extend for an additional five years.

         The Company also occupies two facilities comprising 98,000 square feet
in Morrisville, North Carolina, under leases expiring in March and September,
2003, primarily for engineering, product development, customer support and
regional sales activities for its network switching and intelligent network
diagnostics products. In November 1998, the Company agreed to lease a 152,000
square-foot facility in Morrisville, North Carolina. Under the terms of this
lease, the Company will terminate its current leases in North Carolina without
penalty. The Company intends to occupy the new facility and terminate its
current leases upon completion of construction of the new facility currently
scheduled for November 1999. The Company also has five regional sales offices
occupying an aggregate of approximately 9,000 square feet under leases expiring
between 1999 and 2001 in Campbell, California; Aurora, Colorado; Lombard,
Illinois; Tinton Falls, New Jersey and Irving, Texas. Additionally, the Company
has a research and development facility in Woodinville, Washington occupying
approximately 2,100 square feet under a lease expiring in November 1999. The
Company's Japanese subsidiary occupies approximately 10,600 square feet in Tokyo
under leases expiring between April 1999 and November 1999. The Company's
subsidiary in the United Kingdom occupies approximately 300 square feet in
London under a month-to-month lease. The Company believes that its existing
facilities will be adequate to meet its needs at least through 1999, and that it
will be able to obtain additional space when and as needed on acceptable terms.

ITEM 3.  LEGAL PROCEEDINGS.

         Inapplicable.

ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

         Inapplicable.



                                       23
<PAGE>   24
                                     PART II


ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS.

        The Company's Common Stock is traded over the counter on The Nasdaq
Stock Market under the symbol TKLC. The following table sets forth the high and
low closing sales prices for the Common Stock, as reported on The Nasdaq Stock
Market. As of March 1, 1999, there were 238 record holders of the Company's
Common Stock and approximately 9,000 beneficial holders based on information
provided by the Company's transfer agent and proxy solicitation agent.


<TABLE>
<CAPTION>
                                                             High            Low
                                                         -----------    -----------
<S>                                                      <C>            <C>        
1997
   First Quarter .................................       $      5.74    $      4.13
   Second Quarter ................................              9.44           4.75
   Third Quarter .................................             19.85           8.82
   Fourth Quarter ................................             23.57          13.97

1998
   First Quarter .................................       $     22.69    $     14.05
   Second Quarter ................................             25.13          19.94
   Third Quarter .................................             24.63          13.75
   Fourth Quarter ................................             22.25          10.63
</TABLE>


        The Company has never paid a cash dividend. It is the present policy of
the Company to retain earnings to finance the growth and development of its
business and, therefore, the Company does not anticipate paying cash dividends
on its Common Stock in the foreseeable future.


                                       24


<PAGE>   25
ITEM 6. SELECTED CONSOLIDATED FINANCIAL DATA.

        The statement of operations data included in the selected consolidated
financial data set forth below for the years ended December 31, 1998, 1997 and
1996 and the balance sheet data set forth below at December 31, 1998 and 1997
are derived from, and are qualified in their entirety by reference to, the
Company's audited consolidated financial statements and notes thereto. The
statement of operations data set forth below for the years ended December 31,
1995 and 1994 and the balance sheet data set forth below at December 31, 1996,
1995 and 1994 are derived from audited consolidated financial statements of the
Company, which are not included herein.

                        FIVE-YEAR SELECTED FINANCIAL DATA


<TABLE>
<CAPTION>
FOR THE YEARS ENDED DECEMBER 31,                        1998           1997           1996            1995           1994 
                                                      ---------------------------------------------------------------------
                                                                       (thousands, except per-share data)
<S>                                                   <C>            <C>            <C>             <C>            <C>     
STATEMENT OF OPERATIONS DATA:
Revenues ........................................     $176,669       $125,140       $ 72,126        $ 75,276       $ 61,189
Income (Loss) before provision
  for income taxes ..............................       55,551         29,741           (284)          8,450          5,711
Net income (loss) ...............................       39,209         28,996         (2,511)          6,311          4,460
Earnings (Loss) per share(1):
    Basic .......................................     $   0.73       $   0.58       $  (0.05)       $   0.15       $   0.13
    Diluted .....................................         0.67           0.51          (0.05)           0.13           0.12
Weighted average number of shares outstanding(1):
    Basic .......................................       53,518         50,408         47,100          42,116         34,736
    Diluted .....................................       58,708         56,842         47,100          48,207         37,259

BALANCE SHEET DATA (at December 31):
Cash and investments ............................     $113,774       $ 70,518       $ 44,244        $ 43,609       $  7,653
Working capital .................................      108,762         86,354         44,688          56,983         13,466
Total assets ....................................      210,242        136,465         82,518          80,488         34,409
Long-term liabilities ...........................        2,252          2,839          1,061             380            654
Shareholders' equity ............................      165,777        107,877         61,751          63,607         18,720
</TABLE>


- -----------------
(1) Earnings (Loss) per share and weighted average number of shares outstanding
    have been retroactively adjusted to reflect the two-for-one stock split
    effected July 6, 1998.


                                       25


<PAGE>   26
ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
        OF OPERATIONS.

        The following discussion should be read in conjunction with, and is
qualified in its entirety by, the consolidated financial statements and the
notes thereto included in this Annual Report on Form 10-K. Historical results
and percentage relationships among any amounts in the financial statements are
not necessarily indicative of trends in operating results for any future
periods.

CORPORATE ORGANIZATION

        The Company is currently organized into two divisions: Network Switching
and Intelligent Network Diagnostics. In January 1999, the Company scaled down
its Data Network Diagnostics Division and integrated this division into its
Intelligent Network Diagnostics Division. The Company's most successful data
network diagnostics efforts have been in the high speed links environment such
as for SS7 over ATM and High Speed Frame Relay. These programs are synergistic
with the Company's intelligent network diagnostics programs. By combining these
programs, the Company believes it can better focus on future opportunities for
its diagnostic products.


        The Network Switching Division develops and markets products, features
and applications based on the Company's EAGLE platform, a high-capacity packet
switch supporting a variety of advanced switching technologies including SS7,
IP, ATM and others, enabling traditional circuit-based operators and new,
packet-based operators to offer value-added services to their respective 
customers.

        The Intelligent Network Diagnostics Division develops and markets
diagnostic products for the communications marketplace. These products,
principally the MGTS products for intelligent network diagnostics and the
Chameleon family of data network diagnostics products, have been the foundation
of the Company's business and the source of the technology and expertise that
has facilitated the Company's entry into other markets.


                                       26


<PAGE>   27
RESULTS OF OPERATIONS

        The following table sets forth, for the periods indicated, the
percentages that statement of operations items bear to total revenues:


<TABLE>
<CAPTION>
                                                           PERCENTAGE OF REVENUES
                                                        FOR THE YEARS ENDED DECEMBER 31,
                                                      ----------------------------------
                                                       1998          1997          1996 
                                                      ----------------------------------
<S>                                                   <C>           <C>           <C>   
Revenues ......................................        100.0%        100.0%        100.0%
    Cost of goods sold ........................         33.3          33.2          37.0
                                                      ------        ------        ------
Gross profit ..................................         66.7          66.8          63.0
    Research and development ..................         14.9          16.8          23.7
    Selling, general and administrative .......         22.9          27.9          41.4
    Restructuring .............................           --            --           0.4
                                                      ------        ------        ------
Income (Loss) from operations .................         28.9          22.1          (2.5)
    Interest and other income, net ............          2.6           1.7           2.1
                                                      ------        ------        ------
Income (Loss) before provision for income taxes         31.5          23.8          (0.4)
    Provision for income taxes ................          9.3           0.6           3.1
                                                      ------        ------        ------
      Net income (loss) .......................         22.2%         23.2%         (3.5)%
                                                      ======        ======        ======
</TABLE>


        The following table sets forth, for the periods indicated, the revenues
by principal product line as a percentage of total revenues:


<TABLE>
<CAPTION>
                                        PERCENTAGE OF REVENUES
                                    FOR THE YEARS ENDED DECEMBER 31,
                                    --------------------------------
                                       1998       1997       1996
                                    --------------------------------
<S>                                 <C>          <C>        <C>
Network switching .................      66%        58%        35%
Intelligent network diagnostics ...      26         29         36
Data network diagnostics ..........       8         13         29
                                      -----      -----      -----
      Total .......................     100%       100%       100%
                                      =====      =====      =====
</TABLE>

        The following table sets forth, for the periods indicated, the revenues
by geographic territory as a percentage of total revenues:


<TABLE>
<CAPTION>
                                PERCENTAGE OF REVENUES
                           FOR THE YEARS ENDED DECEMBER 31,
                        ------------------------------------
                          1998           1997           1996
                        ------------------------------------
<S>                     <C>            <C>            <C>
North America ..            69%            73%            58%
Japan ..........            12             13             22
Europe .........             4              5              9
Rest of World ..            15              9             11
                        ------         ------         ------
      Total ....           100%           100%           100%
                        ======         ======         ======
</TABLE>


                                       27


<PAGE>   28
1998 COMPARED WITH 1997

Revenues

        The Company's revenues increased by $51.5 million, or 41%, during 1998
due to higher sales of switching products and intelligent network diagnostics
products. Sales of data network diagnostics products decreased both in dollars
and as a percentage of total sales.

        Revenues from switching products increased by 62%, or $44.3 million, to
$116.3 million due primarily to increased EAGLE STP market acceptance worldwide
as reflected by higher international sales, increased sales of upgrades and
software enhancements to the Company's larger EAGLE STP installed base and
higher sales of Local Number Portability (LNP) and Local Service Management
System (LSMS) features. In 1998, the Company sold 62 pairs of EAGLE STPs
compared with 45 pairs in 1997.

        Revenues from intelligent network diagnostics products increased by 27%,
or $9.7 million, to $46.3 million. This increase was primarily driven by higher
sales of development services in Japan and the addition of sales of the
Company's MGTS Sentinel product domestically, partially offset by lower MGTS
product sales in Japan.

        Revenues from data network diagnostics products decreased by 15%, or
$2.5 million, to $14.1 million primarily due to lower sales of the Company's
Chameleon products in all markets, partially offset by increased sales of
third-party data diagnostics products in Japan by the Company's Japanese
subsidiary.

        Revenues in North America increased by $29.9 million, or 33%, as a
result of higher switching and MGTS product sales, partially offset by lower
Chameleon product sales. Revenues in Japan increased by $5.6 million, or 34%,
due primarily to higher sales of MGTS-related development services and
third-party data diagnostics products, partially offset by lower Chameleon and
MGTS product sales. Revenues in Europe increased by $1.1 million, or 16%, due to
higher switching product sales. Other international revenues increased by $15.0
million, 141%, primarily due to higher switching product sales including a large
sale in South Africa.

        The impact of exchange rate fluctuations on currency translations, which
consisted primarily of the translation of Japanese yen into U.S. dollars,
decreased revenues by approximately $1.5 million, or 1%, and did not have a
significant impact on net income.

        The Company believes that its future revenue growth depends in large
part upon a number of factors, including the continued market acceptance of the
Company's products, particularly the EAGLE products and related applications,
the MGTS Sentinel, and market acceptance of the Company's recently introduced
EAGLE IP7 and FALCON product lines. In 1998, the Company experienced significant
revenue growth, particularly in switching products. The Company expects that
switching product sales will continue to grow in 1999, both in dollars and as a
percentage of total revenues, although at a lower percentage rate of growth than
in 1998.


                                       28


<PAGE>   29
Gross Profit

        Gross profit as a percentage of revenues was essentially flat at 67%.
Changes in the following factors, among others, may affect gross profit: product
and distribution channel mix, competition, customer discounts, supply and demand
conditions in the electronic components industry, internal manufacturing
capabilities and efficiencies, foreign currency fluctuations and general
economic conditions.

Research and Development

        Although research and development expenses increased by $5.4 million, or
25%, such expenses decreased as a percentage of revenues from 17% in 1997 to 15%
in 1998. The dollar increase was attributable primarily to ongoing development
expenses in the Network Switching Division with respect to development of new
features for the EAGLE products and consisted principally of expenses incurred
in connection with the hiring of additional personnel and higher depreciation
expense resulting from equipment acquisitions.

        The Company intends to continue to make substantial investments in
product and technology development and believes that its future success depends
in large part upon its ability to continue to enhance existing products and to
develop or acquire new products that maintain its technological competitiveness.

Selling, General and Administrative

        Although selling, general and administrative expenses increased by $5.5
million, or 16%, such expenses decreased as a percentage of revenues from 28% in
1997 to 23% in 1998. The increase in dollars was attributable primarily to
increased infrastructure costs required to meet the needs of the growing EAGLE
installed base and to support higher sales levels of switching and intelligent
network diagnostics products. Sales, general and administrative expenses were
reduced in 1998 by the proceeds from the settlement of an insurance claim in the
amount of approximately $1.7 million, net of applicable costs.

Income Taxes

        During 1998, the Company recorded tax benefits of $3.7 million resulting
from a reduction of its valuation allowance for deferred taxes, and tax benefits
associated with research and development tax credits. The reduction in the
valuation allowance was based on the Company's improved income trend and
management's assessment of various uncertainties related to the Company's
ability to utilize certain research and development tax credit carryforwards.
For the year ended December 31, 1998, excluding the one-time tax benefits, the
Company had a tax provision of $20.0 million, resulting in an effective tax rate
of 36%. For 1997, the Company had an effective tax rate of 33% excluding a
one-time tax benefit of $9.0 million resulting from a reduction of its valuation
allowance for deferred taxes.

Interest, Net

        Net interest income increased by $2.4 million primarily as a result of
higher average investment balances in 1998.


                                       29


<PAGE>   30
1997 COMPARED WITH 1996

Revenues

        The Company's revenues increased by $53.0 million, or 73%, during 1997
due to higher sales of switching products and intelligent network diagnostics
products. Sales of data network diagnostics products decreased both in dollars
and as a percentage of total sales.

        Revenues from switching products increased by 184%, or $46.6 million, to
$71.9 million due primarily to increased EAGLE STP market acceptance principally
in the U.S., and the addition of sales of the Company's LNP and related LSMS
features. Additionally, the EAGLE STP average selling price increased as a
result of the Company's sales of larger systems to the Regional Bell Operating
Company (RBOC) market. In 1997, 45 pairs of EAGLE STPs were sold compared with
26 pairs in 1996.

        Revenues from intelligent network diagnostics products increased by 43%,
or $11.0 million, to $36.6 million. This increase was primarily driven by strong
demand for the Company's MGTS products in all geographic markets, particularly
North America.

        Revenues from data network diagnostics products decreased by 21%, or
$4.6 million, to $16.6 million primarily due to lower sales in all markets for
both the Chameleon Open and the Company's older Chameleon products.

        Revenues in North America increased by $49.5 million, or 118%, as a
result of higher switching and MGTS product sales, partially offset by lower
Chameleon product sales. Revenues in Japan increased by $638,000, or 4%, due
primarily to higher sales of MGTS products partially offset by the impact of
exchange rate fluctuations on currency translations in 1997. Other international
revenues increased by $2.8 million, or 19%, primarily due to higher switching
product sales in the rest of the world and higher MGTS product sales in Europe.

        The impact of exchange rate fluctuations on currency translations, which
consisted primarily of the translation of Japanese yen into U.S. dollars,
decreased revenues by approximately $1.9 million, or 2%, and did not have a
significant impact on net income.


                                       30


<PAGE>   31
Gross Profit

        Gross profit as a percentage of revenues increased from 63% in 1996 to
67% in 1997, due primarily to the addition of sales of higher margin LNP and
LSMS features and improved manufacturing efficiencies due to higher sales
volumes.

Research and Development

        Although research and development expenses increased by $3.9 million, or
23%, such expenses decreased as a percentage of revenues from 24% in 1996 to 17%
in 1997. The dollar increase was attributable primarily to ongoing development
expenses in the Network Switching Division with respect to the Company's LNP and
LSMS features for the EAGLE STP product, and consisted principally of expenses
incurred in connection with the hiring of additional personnel and higher
depreciation expense resulting from equipment acquisitions. Additionally,
research and development expenses increased as a result of the accrual of
certain costs for performance-related award programs.

Selling, General and Administrative

        Although selling, general and administrative expenses increased by $5.1
million, or 17%, such expenses decreased as a percentage of revenues from 41% in
1996 to 28% in 1997. The increase in dollars was attributable primarily to
increased infrastructure costs to meet the needs of the growing EAGLE installed
base and to support higher sales levels of switching and intelligent network
diagnostics products, and the accrual of certain costs for performance-related
award programs.

Income Taxes

        During 1997, the Company recorded a tax benefit of $9.0 million
resulting from a reduction of its valuation allowance for deferred taxes. The
reduction in the valuation allowance was based on the Company's improved income
trend and management's assessment of various uncertainties related to the future
realization of its deferred tax benefits. For the year ended December 31, 1997,
excluding the one-time tax benefit, the Company had a tax provision of $9.7
million, resulting in an effective tax rate of 33%. Although the Company's 1996
pretax results showed a loss, the Company had a tax provision of $2.2 million,
which consisted principally of foreign taxes on the income of the Company's
Japanese subsidiary and reflected the Company's then inability to recognize a
benefit for its U.S. loss and credits carryforwards.

Interest, Net

        Net interest income increased by $685,000 primarily as a result of
higher average investment balances in 1997.

LIQUIDITY AND CAPITAL RESOURCES

        During 1998, cash and cash equivalents decreased by $6.8 million to
$31.9 million, after a net purchase of approximately $50.1 million of short-term
and long-term investments. Operating activities, including the effects of
exchange rate changes on cash, provided $44.5 million. Financing activities,
which represented proceeds from the issuance of Common Stock upon the exercise
of options and warrants, provided $7.6 million and investing activities,
excluding purchases of short-term and long-term investments, used $8.9 million.


                                       31


<PAGE>   32
        Accounts receivable at December 31, 1998, including amounts due from
related parties, increased by 80% compared to December 31, 1997, due primarily
to increased sales levels and a higher concentration of sales at the end of the
fourth quarter of 1998 compared to 1997. Inventories increased by 14% during
1998 primarily to support the increased sales levels and the expanded breadth of
the Company's products. Trade accounts payable and accrued expenses increased by
122% and 86%, respectively, primarily due to the timing of purchases and
increased level of operating expenses incurred by the Company primarily to
support higher sales levels and the Company's product development programs.
Deferred revenues increased by 21% primarily as a result of increased extended
warranty service revenues that are recognized ratably over the warranty period
and the timing of installation activities.

        Capital expenditures were $8.7 million during 1998 and represented the
planned acquisition of equipment principally for research and development,
manufacturing operations and facility expansion. The Company expects capital
expenditures will increase significantly in 1999, principally for the
acquisition of equipment for research and development, sales demonstration and
manufacturing operations to support the Company's planned growth.

        Net cash provided by financing activities in 1998 was $7.6 million,
which represented proceeds from the issuance of Common Stock upon the exercise
of options and warrants.

        In July 1998, the Company renewed its credit facility with a U.S. bank
and increased the maximum line of credit available thereunder from $10.0 million
to $15.0 million. The Company also has lines of credit aggregating $3.9 million
available to its Japanese subsidiary from various Japan-based banks.

        The Company's $15.0 million credit facility is collateralized by
substantially all of the Company's assets, bears interest at, or in some cases
below, the lender's prime rate (7.75% at December 31, 1998), and expires on June
30, 2000, if not renewed. Under the terms of this facility, the Company is
required to maintain certain financial ratios and meet certain net worth and
indebtedness tests for which the Company is in compliance.

        The Company's Japanese subsidiary has collateralized yen-denominated
lines of credit with Japan-based banks, primarily available for use in Japan,
amounting to the equivalent of $3.9 million with interest at the Japanese prime
rate (1.5% at December 31, 1998) plus 0.125% per annum, which expire between
August 5, 1999, and March 31, 2000, if not renewed.

        There were no borrowings by the Company under the lines of credit
described above or any other lines of credit in 1998 or 1997.

        The Company believes that existing working capital, funds generated from
operations and its current bank lines of credit are sufficient to satisfy
anticipated operating requirements at least through 1999. Nonetheless, the
Company may seek additional sources of capital as necessary or appropriate to
fund acquisitions or to otherwise finance the Company's growth or operations;
however, there can be no assurance that such funds, if needed, will be available
on favorable terms, if at all.


                                       32


<PAGE>   33
Foreign Exchange

        International operations are subject to certain opportunities and risks,
including currency fluctuations. In 1998, 1997 and 1996, the percentages by
which weighted average exchange rates for the Japanese yen weakened against the
U.S. dollar were 7%, 9% and 18%, respectively.

        The change in cumulative translation adjustments in 1998 was due
primarily to the strengthening of the Japanese yen against the U.S. dollar when
comparing the exchange rate at December 31, 1998, to that of December 31, 1997.
Realized exchange gains (losses) are recorded in the period when incurred, and
amounted to $56,000, $(273,000) and $(180,000) in 1998, 1997 and 1996,
respectively. Exchange gains and losses include the remeasurement of certain
currencies into functional currencies and the settlement of intercompany
balances.

Readiness for Year 2000

        Background. As the year 2000 approaches, a critical issue has emerged
regarding how existing application software programs, operating systems and
embedded computer chips can accommodate the year 2000 date value. The Company
has a year 2000 project team in place with overall responsibility for the
Company's year 2000 compliance programs. In addition, executive management
regularly monitors the status of the Company's year 2000 remediation plans.

        Project. The Company has identified potential year 2000 risks in four
categories: software and system products the Company sells to customers;
internal business software and information technology systems; systems other
than information technology systems ("Non-IT systems"); and third-party
suppliers to the Company. The Company's year 2000 project includes the following
phases for the first three categories above: (1) identifying year 2000 risks;
(2) assigning priorities to identified risks; (3) testing year 2000 compliance
for risks determined to be material to the Company; (4) correcting problems
determined to be material and not year 2000 compliant; (5) retesting corrections
that have been implemented; and (6) developing contingency plans. With respect
to the Company's third-party suppliers, the Company's year 2000 project consists
of the following phases: (1) contacting suppliers for information concerning
their year 2000 readiness; (2) prioritizing suppliers as to relative importance;
(3) validating supplier responses regarding year 2000 compliance; and (4)
developing contingency plans in the event that one or more suppliers fail to
achieve year 2000 compliance.

        Assessment. The software and systems products that the Company sells to
customers consist of internally developed software, third-party software
licensed by the Company for use in or with the Company's products, hardware
systems designed and manufactured by the Company and hardware systems designed
and manufactured by third parties. The Company has identified priorities,
completed the initial testing phase and begun offering solutions to its
customers. The Company believes that its current product offerings are year 2000
compliant. For past product offerings that the Company is still supporting, the
Company is offering releases that should make such products year 2000 compliant.
However, failure to achieve year 2000 compliance for any products could
materially adversely affect sales in 1999. Additionally, if any of the Company's
mission critical products were to fail in the field as a result of year 2000
noncompliance, such failure could result in substantial liability to the Company
and have a material adverse effect on the Company's financial results, business,
market position, reputation and prospects.


                                       33


<PAGE>   34
Internal business software and systems consist primarily of the Company's
business information systems in the United States and at the Company's Japanese
subsidiary. The Company has completed its initial year 2000 project phases with
respect to its business systems, and is in the process of developing,
implementing and testing the necessary modifications. The Company believes that
its internal business software and systems will be year 2000 compliant. However,
if the Company's business systems are not year 2000 compliant, the Company could
experience interruptions to its production process, development programs and
general business operations.

The Company has been advised by the suppliers of its Non-IT systems, which
consist primarily of environmental systems such as fire suppression and security
systems in the various buildings the Company occupies, that such systems are
year 2000 compliant.

Third-party suppliers provide component parts, purchased assemblies and contract
manufacturing services incorporated by the Company into the products and systems
it sells. The Company is requiring that each of its key suppliers certify
whether they are year 2000 compliant. The Company has also prioritized its
suppliers by level of criticality to the Company's business. Based on
information received from its suppliers, the Company estimates that
approximately 41% of its critical suppliers are presently year 2000 compliant.
The Company plans to monitor its critical suppliers and either develop alternate
sources or increase inventory levels prior to the year 2000 for those vendors
considered to be at risk of not timely achieving year 2000 compliance. However,
there can be no assurance that such alternate sources will be available or that
adequate inventory levels will be attainable if necessary, and the Company could
experience parts shortages and production interruptions if one or more key
third-party suppliers experience year 2000 problems.

        Costs. Incremental costs of the Company's year 2000 project have
consisted of the hiring of two contractors to assist with administrative duties
related to the year 2000 project, consulting by PricewaterhouseCoopers LLP at
the initial stages of the project and a third-party audit team, which provides
year 2000 compliance test audit reports. Such costs in the aggregate have not
been material to the Company's financial position, results of operations or cash
flows. The balance of the effort for the Company's year 2000 project has been by
employees whose costs for this project are not tracked separately. The Company
believes that costs for the remainder of the year 2000 project will not be
material to the Company's financial position, results of operations or cash
flows.

        Risks. The Company's results of operations, financial condition and cash
flows could be materially adversely affected if the Company or any of its key
suppliers or customers do not achieve year 2000 compliance. Although the
Company's year 2000 project is expected to minimize the Company's risks of
experiencing a year 2000 problem, inherent risks and uncertainties exist despite
the Company's efforts. There can be no assurance that a failure on the part of
the Company, its products, its key suppliers or its customers will not be
disruptive to the Company's business. As a result of these uncertainties the
Company is unable to determine at this time whether the consequences of year
2000 failures will have a material effect on the Company's results of
operations, financial condition or cash flows.


                                       34


<PAGE>   35
Reorganization

        In January 1999, the Company announced its decision to scale down its
Data Network Diagnostics Division and integrate the division into its
Intelligent Network Diagnostics Division. In connection with this activity, the
Company will record a charge of approximately $1.8 million in the first quarter
of 1999, which represents a workforce reduction of 25 employees and the
write-off of certain assets related to the Data Network Diagnostics Division.

"Safe Harbor" Statement under the Private Securities Litigation Reform Act of
1995

        The statements that are not historical facts contained in this
Management's Discussion and Analysis of Financial Condition and Results of
Operations and other sections of this Annual Report on Form 10-K are
forward-looking statements within the meaning of the Private Securities
Litigation Reform Act of 1995 that reflect the current belief, expectations or
intent of the Company's management. These statements are subject to and involve
certain risks and uncertainties including, but not limited to, timing of
significant orders and shipments, changes in customer product mix, customer
acceptance of the Company's products, capital spending patterns of customers,
including shifts in such patterns as a result of customers' deferral of product
purchases until the year 2000, competition and pricing, new product
introductions by the Company or its competitors, carrier deployment of
intelligent network services, the level and timing of research and development
expenditures, regulatory changes, readiness for the year 2000 by the Company,
its customers and its suppliers, general economic conditions and other risks
described in this Annual Report on Form 10-K and in certain of the Company's
other Securities and Exchange Commission filings. Many of these risks and
uncertainties are outside of the Company's control and are difficult for the
Company to forecast or mitigate. Actual results may differ materially from those
expressed or implied in such forward-looking statements.


                                       35


<PAGE>   36
ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

        Inapplicable.


ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.

        See the consolidated financial statements of the Company and its
subsidiaries included herein and listed in Item 14 (a) of this Annual Report on 
Form 10-K.


ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
        FINANCIAL DISCLOSURE.

        Inapplicable.


                                       36


<PAGE>   37
                                    PART III

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT.

        The information required by this Item is incorporated by reference to
the sections of the Company's definitive Proxy Statement for the Annual Meeting
of Shareholders to be held on May 14, 1999, entitled "Election of Directors" and
"Executive Officers" to be filed with the Commission.

ITEM 11. EXECUTIVE COMPENSATION.

        The information required by this Item is incorporated by reference to
the sections of the Company's definitive Proxy Statement for the Annual Meeting
of Shareholders to be held on May 14, 1999, entitled "Election of Directors -
Compensation of Directors," "Executive Compensation and Other Information,"
"Board of Directors and Compensation Committee Reports on Executive
Compensation" and "Performance Graph," to be filed with the Commission.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT.

        The information required by this Item is incorporated by reference to
the section of the Company's definitive Proxy Statement for the Annual Meeting
of Shareholders to be held on May 14, 1999, entitled "Common Stock Ownership of
Principal Shareholders and Management," to be filed with the Commission.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS.

        The information required by this Item is incorporated by reference to
the section of the Company's definitive Proxy Statement for the Annual Meeting
of Shareholders to be held on May 14, 1999, entitled "Certain Relationships and
Related Transactions," to be filed with the Commission.


                                       37


<PAGE>   38
                                     PART IV

ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K.

(a)     The following documents are filed as part of this Report:


<TABLE>
<CAPTION>
               CONSOLIDATED FINANCIAL STATEMENTS                                       PAGE
                                                                                       ----
<S>                                                                                    <C>
               -       Report of Independent Accountants                                F-1

               -       Consolidated Statements of Operations for each of the
                       three years in the period ended December 31, 1998                F-2

               -       Consolidated Balance Sheets as of December 31, 1998 and 1997     F-3

               -       Consolidated Statements of Cash Flow for each of the
                       three years in the period ended December 31, 1998                F-4

               -       Consolidated Statements of Shareholders' Equity for each of
                       the three years in the period ended December 31, 1998            F-5

               -       Consolidated Statements of Comprehensive Income for each 
                       of the three years in the period ended December 31, 1998         F-6

               -       Notes to Consolidated Financial Statements                       F-7

               -       Report of Independent Accountants on Financial Statement
                       Schedule                                                         S-1

               -       Schedule II   Valuation and Qualifying Accounts and Reserves
                                     for each of the three years in the period ended
                                     December 31, 1998                                  S-2
</TABLE>


        Schedules which are not listed above have been omitted because they are
not applicable or the information required to be set forth therein is included
in the consolidated financial statements or notes thereto.

               LIST OF EXHIBITS

        3.1     Amended and Restated Articles of Incorporation(1)

        3.2     Bylaws, as amended(2)

        4.1     Rights Agreement dated as of August 25, 1997 between the
                Registrant and U.S. Stock Transfer Corporation as Rights
                Agent(3)


                                       38


<PAGE>   39
        10.1    Amended and Restated 1984 Stock Option Plan, including forms of
                stock option agreements(4)(5)

        10.2    Amended and Restated Non-Employee Director Equity Incentive
                Plan, including forms of stock award certificate and
                nonstatutory stock option agreements(6), as amended February 21,
                1996(5)(7)

        10.3    1994 Stock Option Plan, including forms of stock option
                agreements(6), as amended February 4, 1995(8), March 3, 1995
                (8), January 27, 1996(7), February 26, 1997(9), March 19,
                1997(9), and March 20, 1998(5)(10)

        10.4    Retirement Pension Rules of Tekelec, Ltd.(5)(11)

        10.5    Form of Indemnification Agreement between the Registrant and all
                directors of the Registrant(5)(12)

        10.6    Lease dated as of February 8, 1988 between the Registrant and
                State Street Bank and Trust Company of California, N.A., not
                individually, but solely as an Ancillary Trustee for State
                Street Bank and Trust Company, a Massachusetts banking
                corporation, not individually, but solely as Trustee for the
                AT&T Master Pension Trust, covering the Company's principal
                facilities in Calabasas, California(13)

        10.7    Form of International Distributor Agreement(14) and Schedule of
                Distributors

        10.8    Officers Severance Plan, including form of Employment Separation
                Agreement (5)(15), as amended March 8, 1999

        10.9    Employee Stock Purchase Plan, including form of subscription
                agreement(5)(7)

        10.10   Credit Agreement dated October 22, 1996 between the Registrant
                and Imperial Bank, together with Promissory Note of the
                Registrant dated October 22, 1996(2), amended by First Amendment
                to Credit Agreement dated July 15, 1998, together with
                Promissory Note of the Registrant dated July 15, 1998(1)

        10.11   General Security Agreement dated October 22, 1996 between the
                Registrant and Imperial Bank(2)

        10.12   Agreement dated September 9, 1997 between the Registrant and
                Shigeru Suzuki(3), as amended by Agreement dated January 6,
                1998(16)

        10.13*  Distribution and OEM Agreement dated as of June 1, 1997 between
                the Registrant and Daewoo Telecom, Ltd.(3)

        10.14   Warrants to purchase shares of the Company's Common Stock and
                Schedule of Warrantholders(5)(17)


                                       39


<PAGE>   40
        10.15   Stock Award Agreement dated February 17, 1998 between the
                Registrant and Michael Margolis(16)

        10.16   Lease dated as of November 6, 1998 between the Registrant and
                Weeks Realty, L.P., covering the Company's facilities in
                Morrisville, North Carolina

        10.17   Employment Offer Letter dated January 13, 1999 between the
                Registrant and Teresa Pippin

        21.1    Subsidiaries of the Registrant

        23.1    Consent of PricewaterhouseCoopers LLP

        27.1    Financial Data Schedule for the year ended December 31, 1998

- ----------------------
*       Confidential treatment has been granted with respect to portions of this
        exhibit, and such confidential portions have been deleted and filed with
        the Commission pursuant to Rule 24b-2 promulgated under the Securities
        Exchange Act of 1934.

(1)     Incorporated by reference to the Registrant's Quarterly Report on Form
        10-Q (File No. 0-15135) for the quarter ended June 30, 1998.

(2)     Incorporated by reference to the Registrant's Annual Report on Form 10-K
        (File No. 0-15135) for the year ended December 31, 1996.

(3)     Incorporated by reference to the Registrant's Quarterly Report on Form
        10-Q (File No. 0-15135) for the quarter ended September 30, 1997.

(4)     Incorporated by reference to the Registrant's Registration Statement on
        Form S-8 (Registration No. 33-48079) filed with the Commission on May
        22, 1992.

(5)     Constitutes a management contract or compensatory plan or arrangement
        required to be filed as an exhibit to this Annual Report on Form 10-K.

(6)     Incorporated by reference to the Registrant's Registration Statement on
        Form S-8 (Registration No. 33-82124) filed with the Commission on July
        28, 1994.

(7)     Incorporated by reference to the Registrant's Registration Statement on
        Form S-8 (Registration No. 333-05933) filed with the Commission on June
        13, 1996.

(8)     Incorporated by reference to the Registrant's Registration Statement on
        Form S-8 (Registration No. 33-60611) filed with the Commission on June
        27, 1995.


                                       40


<PAGE>   41
(9)     Incorporated by reference to the Registrant's Registration Statement on
        Form S-8 (Registration No. 333-28887) filed with the Commission on June
        10, 1997.

(10)    Incorporated by reference to the Registrant's Registration Statement on
        Form S-8 (Registration No. 333-71261) filed with the Commission on
        January 27, 1999.

(11)    Incorporated by reference to the Registrant's Annual Report on Form 10-K
        (File No. 0-15135) for the year ended December 31, 1994.

(12)    Incorporated by reference to the Registrant's Annual Report on Form 10-K
        (File No. 0-15135) for the year ended December 31, 1987.

(13)    Incorporated by reference to the Registrant's Quarterly Report on Form
        10-Q (File No. 0-15135) for the quarter ended June 30, 1988.

(14)    Incorporated by reference to the Registrant's Registration Statement on
        Form S-1 (Registration No. 33-4123) filed with the Commission on March
        19, 1986.

(15)    Incorporated by reference to the Registrant's Annual Report on Form 10-K
        (File No. 0-15135) for the year ended December 31, 1993.

(16)    Incorporated by reference to the Registrant's Quarterly Report on Form
        10-Q (Filed No. 0-15135) for the quarter ended March 31, 1998.

(17)    Incorporated by reference to the Registrant's Registration Statement on
        Form S-8 (Registration No. 333-37843) filed with the Commission on
        October 14, 1997.

(b)     REPORTS ON FORM 8-K

        No reports on Form 8-K were filed or required to be filed by the
        Registrant during the quarter ended December 31, 1998.

(c)     EXHIBITS

        See the list of Exhibits under Item 14(a)3 of this Annual Report on Form
        10-K.

(d)     FINANCIAL STATEMENT SCHEDULES

        See the Schedule under Item 14(a)2 of this Annual Report on Form 10-K.


                                       41


<PAGE>   42
                                   SIGNATURES

        Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.

                                     TEKELEC


                                     By: /s/ MICHAEL L. MARGOLIS
                                        -------------------------------------
                                        Michael L. Margolis, President and
                                        Chief Executive Officer

Dated:  March 29, 1999


        Pursuant to the requirements of the Securities Act of 1934, this report
has been signed below by the following persons on behalf of the Registrant and
in the capacities and on the dates indicated.


<TABLE>
<CAPTION>
   Signature                               Title                         Date
   ---------                               -----                         ----
<S>                                <C>                              <C>
/s/  Jean-Claude Asscher           Chairman of the Board            March 29, 1999
- -------------------------------
     Jean-Claude Asscher


/s/  Michael L. Margolis           President, Chief Executive       March 29, 1999
- -------------------------------    Officer and Director
     Michael L. Margolis           


/s/  Robert V. Adams               Director                         March 29, 1999
- -------------------------------
     Robert V. Adams


/s/  Daniel L. Brenner             Director                         March 29, 1999
- -------------------------------
     Daniel L. Brenner


/s/  Howard Oringer                Director                         March 29, 1999
- -------------------------------
     Howard Oringer


/s/  Jon F. Rager                  Director                         March 29, 1999
- -------------------------------
     Jon F. Rager


/s/  Gilles C. Godin               Vice President, Finance and      March 29, 1999
- -------------------------------    Chief Financial Officer
     Gilles C. Godin               
</TABLE>


                                       42

<PAGE>   43
                        REPORT OF INDEPENDENT ACCOUNTANTS


To The Shareholders And Board Of Directors Of Tekelec



In our opinion, the accompanying consolidated balance sheets and the related
consolidated statements of operations, cash flow, shareholders' equity, and
comprehensive income present fairly, in all material respects, the financial
position of Tekelec and its subsidiaries (the "Company") at December 31, 1998
and 1997, and the results of their operations and their cash flows for each of
the three years in the period ended December 31, 1998, in conformity with
generally accepted accounting principles. These financial statements are the
responsibility of the Company's management; our responsibility is to express an
opinion on these financial statements based on our audits. We conducted our
audits of these statements in accordance with generally accepted auditing
standards which require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for the opinion expressed above.






/s/
PricewaterhouseCoopers LLP
Woodland Hills, California
February 2, 1999


                                      F-1


<PAGE>   44
                                     TEKELEC
                      CONSOLIDATED STATEMENTS OF OPERATIONS


<TABLE>
<CAPTION>
                                                                        FOR THE YEARS ENDED DECEMBER 31,
                                                               -----------------------------------------------------
                                                                  1998                 1997                  1996  
                                                               -----------------------------------------------------
                                                                        (thousands, except per-share data)
<S>                                                            <C>                  <C>                  <C>        
REVENUES ...........................................           $   176,669          $   125,140          $    72,126

COSTS AND EXPENSES:
    Cost of goods sold .............................                58,902               41,524               26,682
    Research and development .......................                26,371               21,019               17,076
    Selling, general and administrative ............                40,458               34,971               29,842
    Restructuring ..................................                    --                   --                  327
                                                               -----------          -----------          -----------
      Total costs and expenses .....................               125,731               97,514               73,927
                                                               -----------          -----------          -----------

Income (Loss) from operations ......................                50,938               27,626               (1,801)
Other income (expense):
    Interest, net ..................................                 4,785                2,378                1,693
    Other, net .....................................                  (172)                (263)                (176)
                                                               -----------          -----------          -----------
      Total other income ...........................                 4,613                2,115                1,517
Income (Loss) before provision for income taxes ....                55,551               29,741                 (284)
                                                               -----------          -----------          -----------
    Provision for income taxes .....................                16,342                  745                2,227
                                                               -----------          -----------          -----------
      NET INCOME (LOSS) ............................           $    39,209          $    28,996          $    (2,511)
                                                               ===========          ===========          ===========

EARNINGS (LOSS) PER SHARE(1):
      Basic ........................................           $      0.73          $      0.58          $     (0.05)
      Diluted ......................................                  0.67                 0.51                (0.05)
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING(1):
      Basic ........................................                53,518               50,408               47,100
      Diluted ......................................                58,708               56,842               47,100
</TABLE>


- --------------

(1) Earnings (Loss) per share and weighted average number of shares outstanding
    have been retroactively adjusted to reflect the two-for-one stock split
    effected July 6, 1998.

See notes to consolidated financial statements


                                      F-2


<PAGE>   45
                                     TEKELEC
                           CONSOLIDATED BALANCE SHEETS


<TABLE>
<CAPTION>
                                                                                        DECEMBER 31,
                                                                              -------------------------------
                                                                                  1998                1997  
                                                                              -------------------------------
                                                                               (thousands, except share data)
<S>                                                                           <C>                 <C>        
                                      ASSETS
CURRENT ASSETS:
    Cash and cash equivalents ..........................................      $    31,932         $    38,748
    Short-term investments, at fair value ..............................           37,704              19,773
    Accounts and notes receivable, less allowances
        1998 -- $763; 1997 -- $469 .....................................           54,606              29,141
    Inventories ........................................................           12,872              11,281
    Amounts due from related parties ...................................            1,896               2,286
    Income taxes receivable ............................................               32                 805
    Deferred income taxes, net .........................................            8,616               8,309
    Prepaid expenses and other current assets ..........................            3,317               1,760
                                                                              -----------         -----------
      Total current assets .............................................          150,975             112,103

Long-term investments, at fair value ...................................           44,138              11,997
Property and equipment, net ............................................           12,859               9,841
Deferred income taxes, net .............................................            1,514               1,999
Other assets ...........................................................              756                 525
                                                                              -----------         -----------
      Total assets .....................................................      $   210,242         $   136,465
                                                                              ===========         ===========

                      LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES:
    Trade accounts payable .............................................      $    10,904         $     4,919
    Accrued expenses ...................................................           10,932               5,862
    Accrued payroll and related expenses ...............................            5,660               6,846
    Current portion of deferred revenues ...............................           10,480               7,693
    Income taxes payable ...............................................            4,237                 429
                                                                              -----------         -----------
      Total current liabilities ........................................           42,213              25,749
Long-term portion of deferred revenues .................................            2,252               2,839
                                                                              -----------         -----------
      Total liabilities ................................................           44,465              28,588
                                                                              -----------         -----------

COMMITMENTS AND CONTINGENCIES

SHAREHOLDERS' EQUITY(1):
    Common stock, without par value, 200,000,000 shares authorized;
      issued and outstanding 1998 -- 54,328,512; 1997 -- 52,252,086 ....           92,803              75,627
    Retained earnings ..................................................           72,084              32,875
    Accumulated other comprehensive income (loss) ......................              890                (625)
                                                                              -----------         -----------
      Total shareholders' equity .......................................          165,777             107,877
                                                                              -----------         -----------
      Total liabilities and shareholders' equity .......................      $   210,242         $   136,465
                                                                              ===========         ===========
</TABLE>

- -----------------------
(1) Number of shares outstanding have been retroactively adjusted to reflect the
    two-for-one stock split effected July 6, 1998.

See notes to consolidated financial statements


                                      F-3


<PAGE>   46
                                     TEKELEC
                      CONSOLIDATED STATEMENTS OF CASH FLOW


<TABLE>
<CAPTION>
                                                                        FOR THE YEARS ENDED DECEMBER 31,
                                                              -----------------------------------------------------
                                                                 1998                  1997                 1996 
                                                              -----------------------------------------------------
                                                                                   (thousands)
<S>                                                           <C>                  <C>                  <C>         
CASH FLOW FROM OPERATING ACTIVITIES:
    Net income (loss) ................................        $    39,209          $    28,996          $    (2,511)
    Adjustments to reconcile net income to net cash
      provided by operating activities:
    Depreciation and amortization ....................              5,795                4,790                3,842
    Deferred income taxes ............................                276                  (82)                 (80)
    Stock-based compensation .........................                343                   --                   --
    Changes in assets and liabilities:
      Accounts and notes receivable ..................            (24,873)             (12,537)               1,810
      Inventories ....................................             (1,507)              (3,299)              (1,840)
      Amounts due from related parties ...............                389                   93                  672
      Income taxes receivable ........................                775                 (857)                  --
      Prepaid expenses and other current assets ......             (1,548)                (266)                (564)
      Trade accounts payable .........................              5,660                 (412)               1,776
      Accrued expenses ...............................              4,955                  (49)               1,645
      Accrued payroll and related expenses ...........             (1,225)               2,842                  755
      Deferred revenues ..............................              2,200                6,766                  870
      Income taxes payable ...........................             12,800                 (849)                 370
                                                              -----------          -----------          -----------
        Total adjustments ............................              4,040               (3,860)               9,256
                                                              -----------          -----------          -----------
         Net cash provided by operating activities ...             43,249               25,136                6,745
                                                              -----------          -----------          -----------
CASH FLOW FROM INVESTING ACTIVITIES:
    Purchase of available-for-sale securities ........           (107,272)             (22,737)             (45,033)
    Proceeds from maturity of available-for-sale
        securities ...................................             57,200               18,000               18,000
    Purchase of property and equipment ...............             (8,702)              (6,552)              (6,008)
    (Increase) Decrease in other assets ..............               (195)                  46                   63
                                                              -----------          -----------          -----------
        Net cash (used in) investing activities ......            (58,969)             (11,243)             (32,978)
                                                              -----------          -----------          -----------
CASH FLOW FROM FINANCING ACTIVITIES:
    Repayments of short-term borrowings ..............                 --                   --                 (570)
    Repayment of long-term debt ......................                 --                   --                 (380)
    Repayments of other obligations ..................                 --                   --                  (31)
    Proceeds from issuance of common stock ...........              7,634                8,759                2,050
                                                              -----------          -----------          -----------
        Net cash provided by financing activities ....              7,634                8,759                1,069
                                                              -----------          -----------          -----------
Effect of exchange rate changes on cash ..............              1,270               (1,115)              (1,234)
                                                              -----------          -----------          -----------
        Net increase (decrease) in cash and cash
         equivalents .................................             (6,816)              21,537              (26,398)
                                                              -----------          -----------          -----------
CASH AND CASH EQUIVALENTS AT BEGINNING OF THE YEAR ...             38,748               17,211               43,609
                                                              -----------          -----------          -----------
CASH AND CASH EQUIVALENTS AT END OF THE YEAR .........        $    31,932          $    38,748          $    17,211
                                                              ===========          ===========          ===========

SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
CASH PAID DURING THE YEAR FOR:
      Interest .......................................        $        --          $        --          $        98
      Income taxes ...................................              2,297                2,408                1,970
SUPPLEMENTAL DISCLOSURE OF NON-CASH FLOW ACTIVITY:
      Tax benefit related to stock options ...........              9,199                9,819                   63
</TABLE>


See notes to consolidated financial statements


                                      F-4


<PAGE>   47
                                     TEKELEC
                 CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY


<TABLE>
<CAPTION>
                                                  COMMON STOCK                               ACCUMULATED
                                            --------------------------                           OTHER             TOTAL
                                              NUMBER                          RETAINED       COMPREHENSIVE      SHAREHOLDERS'
                                            OF SHARES(1)     AMOUNT           EARNINGS       INCOME (LOSS)         EQUITY
                                            ---------------------------------------------------------------------------------
                                                                             (thousands)
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                         <C>            <C>              <C>               <C>               <C>        
BALANCE, DECEMBER 31, 1995 .............       46,396      $    54,936      $     6,390       $     2,281       $    63,607
    Exercise of stock options
      and warrants .....................        1,644            2,050               --                --             2,050
    Stock option tax benefits ..........           --               63               --                --                63
    Translation adjustment .............           --               --               --            (1,458)           (1,458)
    Net loss ...........................           --               --           (2,511)               --            (2,511)
- -----------------------------------------------------------------------------------------------------------------------------

BALANCE, DECEMBER 31, 1996 .............       48,040           57,049            3,879               823            61,751
    Exercise of stock options
      and warrants .....................        4,212            8,759               --                --             8,759
    Stock option tax benefits ..........           --            9,819               --                --             9,819
    Translation adjustment .............           --               --               --            (1,448)           (1,448)
    Net income .........................           --               --           28,996                --            28,996
- -----------------------------------------------------------------------------------------------------------------------------

BALANCE, DECEMBER 31, 1997 .............       52,252           75,627           32,875              (625)          107,877
    Exercise of stock options
      and warrants .....................        2,032            7,634               --                --             7,634
    Issuance of restricted stock,
      net of unearned compensation .....           45              343               --                --               343
    Stock option tax benefits ..........           --            9,199               --                --             9,199
    Translation adjustment .............           --               --               --             1,515             1,515
    Net income .........................           --               --           39,209                --            39,209
- -----------------------------------------------------------------------------------------------------------------------------

BALANCE, DECEMBER 31, 1998 .............       54,329      $    92,803      $    72,084       $       890       $   165,777
=============================================================================================================================
</TABLE>

- --------------
(1) Number of shares of Common Stock have been retroactively adjusted to reflect
    the two-for-one stock split effected July 6, 1998.

    See notes to consolidated financial statements


                                      F-5


<PAGE>   48
                                     TEKELEC
                 CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME


<TABLE>
<CAPTION>
                                                      For the Years Ended December 31, 
                                                    -----------------------------------------
                                                      1998            1997             1996 
                                                    -----------------------------------------
                                                                   (thousands)
<S>                                                 <C>             <C>              <C>      
Net income (loss) ...............................   $ 39,209        $ 28,996         $ (2,511)

Other comprehensive income (loss):
    Foreign currency translation adjustments ....      1,515          (1,448)          (1,458)
                                                    --------        --------         --------
Comprehensive income (loss) .....................   $ 40,724        $ 27,548         $ (3,969)
                                                    ========        ========         ========
</TABLE>


See notes to consolidated financial statements


                                      F-6


<PAGE>   49
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


NOTE A -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

PRINCIPLES OF CONSOLIDATION AND PRESENTATION

        The consolidated financial statements include the accounts of the
Company and its subsidiaries. All significant intercompany accounts and
transactions are eliminated. Certain items shown in the December 31, 1997 and
1996 financial statements have been reclassified to conform with the current
period presentation.

ESTIMATES

        The preparation of financial statements requires management to make
estimates and assumptions that affect the reported amounts of assets and
liabilities and disclosure of contingent assets and liabilities at the dates of
the financial statements and revenues and expenses during the reporting periods.
Actual results could differ from those estimates.

CASH AND CASH EQUIVALENTS

        The Company considers all highly liquid debt instruments purchased with
an original maturity of three months or less to be cash equivalents.

INVENTORIES

        Inventories are stated at the lower of cost (first in, first out) or
market.

PROPERTY AND EQUIPMENT

        Property and equipment are stated at cost, less accumulated depreciation
and amortization. Depreciation and amortization are provided using the
straight-line method. The estimated useful lives are:


<TABLE>
<S>                                 <C>
Manufacturing and
    development equipment           3-5 years
Furniture and office equipment      5 years
Demonstration equipment             3 years
Leasehold improvements              The shorter of useful
                                    life or lease term
</TABLE>


LONG-TERM ASSETS

        The Company identifies and records impairment on long-lived assets when
events and circumstances indicate that such assets have been impaired. The
Company periodically evaluates the recoverability of its long-lived assets based
on expected nondiscounted cash flows, and recognizes impairment, if any, based
on expected discounted cash flows.


                                      F-7


<PAGE>   50
PRODUCT WARRANTY COSTS

        The Company generally warrants its products for one year after sale and
provides for estimated future warranty costs at the time revenue is recognized.
At December 31, 1998 and 1997, accrued product warranty costs amounted to $2.3
million and $1.2 million, respectively, and are included in accrued expenses.

REVENUE RECOGNITION

        Revenues from sales of diagnostic products are generally recognized
when products are shipped. Revenues from sales of switching products are
recognized upon shipment to the customer's final site and satisfaction of
related Company obligations, if any. Revenues associated with multiple-element
arrangements (products, upgrades, enhancements and post-contract customer
support) are allocated to each element based on the relative fair value.
Revenues associated with installation are realized upon completion. Extended
warranty service revenues are recognized ratably over the warranty period.
Engineering service revenues are recognized on delivery or as the services are
performed. Development contract revenues are recognized using the
percentage-of-completion method based on the costs incurred relative to total
estimated costs. Provisions for anticipated losses, if any, on development
contracts are recognized in income currently.

INCOME TAXES

        Income tax expense is the tax payable for the period and the change
during the period in non-capital-related deferred tax assets and liabilities.
Deferred income taxes are determined based on the difference between the
financial reporting and tax bases of assets and liabilities using enacted rates
in effect during the year in which the differences are expected to reverse.
Valuation allowances are established when necessary to reduce deferred tax
assets to the amount expected to be realized.

ADVERTISING

        Advertising costs are expensed as incurred and amounted to $781,000,
$669,000 and $620,000 for 1998, 1997 and 1996, respectively.

TRANSLATION OF FOREIGN CURRENCIES

        Translation of foreign currencies is accounted for using the local
currency as the functional currency of the Company's foreign subsidiaries. All
assets and liabilities are translated at exchange rates in effect on the balance
sheet dates while revenues and expenses are translated at average rates in
effect for the period. The resulting gains and losses are included in a separate
component of shareholders' equity. Realized gains (losses) on foreign currency
transactions are reflected in net income (loss) and amounted to $56,000,
$(273,000) and $(180,000) for 1998, 1997 and 1996, respectively.

EARNINGS (LOSS) PER SHARE

        Earnings (Loss) per share are computed using the weighted average number
of shares outstanding and dilutive Common Stock equivalents (options and
warrants), in accordance with Statement of Financial Accounting Standards (SFAS)
No. 128 "Earnings per Share."


                                      F-8


<PAGE>   51
COMPREHENSIVE INCOME

        In 1998, the Company adopted Statement of Financial Accounting Standards
(SFAS) No. 130, "Reporting Comprehensive Income," and accordingly has included a
separate Statement of Comprehensive Income. Comprehensive income generally
represents all changes in shareholders' equity during the period except those
resulting from investments by, or distributions to, shareholders.

SEGMENT INFORMATION

        In 1998, the Company adopted SFAS No. 131, "Disclosures about Segments
of a Business Enterprise and Related Information." SFAS No. 131 supersedes SFAS
No. 14, "Financial Reporting for Segments of a Business Enterprise," replacing
the "industry segment" approach with the "management" approach. The management
approach designates the internal organization that is used by management for
making operating decisions and assessing performance as the source of the
Company's reportable segments. SFAS No. 131 also requires disclosures about
products and services, geographic areas and major customers. The adoption of
SFAS No. 131 did not affect results of operations or financial position but did
affect the disclosure of segment information. See Note M.

NOTE B -- FAIR VALUE OF INVESTMENTS

        The Company has short-term investments in corporate debt securities with
original maturities of less than 90 days whose carrying amounts approximate
their fair values because of their short maturities. These short-term
investments are included in cash and cash equivalents, are classified as
held-to-maturity securities and amounted to $19.4 million and $25.3 million at
December 31, 1998, and December 31, 1997, respectively.

        The Company also had investments classified as available-for-sale
securities included in short-term and long-term investments, categorized as
follows:


<TABLE>
<CAPTION>
                                                                                     DECEMBER 31,
                                                                                -------------------------
                                                                                  1998            1997   
                                                                                -------------------------
                                                                                      (thousands)
<S>                                                                             <C>            <C>       
TYPE OF SECURITY:
Corporate debt securities with maturities of less than one year ...........     $   25,704     $   10,745
U.S. government securities with maturities of less than one year ..........         12,000          9,028
                                                                                ----------     ----------
Total short-term investments ..............................................         37,704         19,773
U.S. government securities with maturities  of between one and two years ..         44,138         11,997
                                                                                ----------     ----------
                                                                                $   81,842     $   31,770
                                                                                ==========     ==========
</TABLE>


These available-for-sale securities are accounted for at their fair value, and
unrealized gains and losses on these securities are reported as a separate
component of shareholders' equity. At December 31, 1998 and 1997, net unrealized
gains or losses on available-for-sale securities were not significant. The
Company utilizes specific identification in computing realized gains and losses
on the sale of investments. Realized gains and losses are reported in other
income and expense, and were not significant for 1998, 1997 and 1996.


                                      F-9


<PAGE>   52
NOTE C -- BUSINESS AND CREDIT RISK

        Financial instruments, which potentially subject the Company to
concentration of credit risk, consist principally of cash, investments and trade
receivables. The Company invests its excess cash in interest-bearing deposits
with major banks, United States government securities, high-quality commercial
paper and money market funds. At times the Company's cash balances may be in
excess of the FDIC insurance limits. With respect to trade receivables, the
Company sells network switching and communications diagnostic systems worldwide
primarily to telephone operating companies, equipment manufacturers and
corporations that use its systems to design, install, maintain, test and operate
communications equipment and networks. Credit is extended based on an evaluation
of each customer's financial condition, and generally collateral is not
required. Credit losses, if any, have been provided for in the financial
statements and to date have been within management's expectations.

NOTE D -- RELATED PARTY TRANSACTIONS

        As of December 31, 1998, the Company's principal shareholder, a director
and his family, and a foreign-affiliated company controlled by the director
owned an aggregate of approximately 27% of the Company's outstanding stock.

        The following is a summary of transactions and balances with these
affiliates:


<TABLE>
<CAPTION>
                                       1998          1997          1996
                                    ----------    ----------    ----------
                                                 (thousands)
<S>                                 <C>           <C>           <C>       
Product sales ..................... $    4,269    $    4,471    $    4,130
Purchases of inventory ............         --           212           125
Director's fees and expenses ......         51           104            59
Due from affiliates ...............      1,896         2,286         2,381
Due to affiliates .................         --            --           145
</TABLE>


        The amounts due from and to the affiliates are non-interest bearing.

        In August 1996, the Company entered into a consulting agreement with a
director, pursuant to which such director earned $30,000 and received a warrant
to purchase 120,000 shares of the Company's Common Stock. This agreement
terminated December 31, 1996.


                                      F-10


<PAGE>   53
NOTE E -- RESTRUCTURING

        During the third quarter of 1996, the Company recorded restructuring
charges amounting to $327,000 which represent severance pay and benefit costs
for eight terminated employees in research and development and support
functions, and other costs related to the consolidation of the Company's Ohio
research facility into the Company's North Carolina facility. The costs
consisted of the following:


<TABLE>
<CAPTION>
                                         (thousands)
<S>                                      <C> 
Severance pay ..........................     $250
Other accrued expenses .................       57
Property and equipment write-down ......       20
                                             ----
                                             $327
                                             ====
</TABLE>


        At December 31, 1997, all identified employees had been terminated, and
all severance costs and other accrued expenses had been paid.

NOTE F -- INCOME TAXES

        The provision for income taxes consists of the following:


<TABLE>
<CAPTION>
                                 FOR THE YEARS ENDED DECEMBER 31,
                          ---------------------------------------------
                             1998             1997             1996 
                          -----------      -----------      -----------
                                           (thousands)
<S>                       <C>              <C>              <C>        
CURRENTLY PAYABLE:
    Federal ............. $    10,736      $     5,394      $        --
    State ...............       3,500            1,554                1
    Foreign .............       1,794              390            2,392

DEFERRED:
    Federal .............       2,134           (5,974)              --
    State ...............      (1,338)            (745)              --
    Foreign .............        (484)             126             (166)
                          -----------      -----------      -----------
                          $    16,342      $       745      $     2,227
                          ===========      ===========      ===========
</TABLE>


                                      F-11


<PAGE>   54
The primary components of temporary differences that gave rise to deferred taxes
at December 31, 1998 and 1997 are as follows:


<TABLE>
<CAPTION>
                                                  DECEMBER 31,
                                               1998           1997
                                           ---------------------------
                                                  (thousands)
<S>                                        <C>             <C>        
DEFERRED TAX ASSETS:
    Net operating loss carryforward ....   $        --     $     3,319
    Foreign tax credit carryforward ....            --             247
    Allowance for doubtful accounts ....           258             257
    Inventory adjustments ..............         1,708           1,715
    Depreciation and amortization ......           188             223
    Research and development
        credit carryforward ............         4,447           2,756
    Accrued liabilities ................         2,191           3,154
    Warranty accrual ...................           885             515
    Other ..............................           453             370
                                           -----------     -----------
    Total deferred tax asset ...........        10,130          12,556
    Less, valuation allowance ..........            --          (2,248)
                                           -----------     -----------
    TOTAL NET DEFERRED TAX ASSET .......        10,130          10,308
                                           -----------     -----------
CURRENT PORTION ........................         8,616           8,309
                                           -----------     -----------
LONG-TERM PORTION ......................   $     1,514     $     1,999
                                           ===========     ===========
</TABLE>


The valuation allowance for deferred taxes decreased by approximately $2.2
million during the year ended December 31, 1998. The reduction in the valuation
allowance is based on the Company's improved income trend and management's
assessment of various uncertainties related to the Company's ability to utilize
certain research and development tax credit carryforwards. Realization of the
net deferred tax assets of $10.1 million is dependent on the Company generating
sufficient taxable income in the future. Although realization is not assured,
the Company believes it is more likely than not that the deferred tax assets
will be realized. The amount of the deferred tax assets considered realizable,
however, could be reduced in the future if estimates of future taxable income
are reduced.


                                      F-12


<PAGE>   55
The provision for income taxes differs from the amount obtained by applying the
federal statutory income tax rate to income before provision for income taxes as
follows:


<TABLE>
<CAPTION>
                                                              FOR THE YEARS ENDED DECEMBER 31,
                                                     -----------------------------------------------
                                                        1998               1997             1996 
                                                     -----------------------------------------------
                                                                        (thousands)
<S>                                                  <C>               <C>               <C>         
Federal statutory provision (benefit) ...........    $    19,443       $    10,112       $       (97)
State taxes, net of federal benefit .............          1,530               534                --
Foreign taxes ...................................            335               226               785
Reduction in valuation allowance ................         (2,248)           (8,960)               --
Utilization of operating loss carryforwards .....             --              (499)               --
Research and development credits ................         (2,111)             (723)               --
Nontaxable FSC income ...........................           (865)               --                --
Loss for which no tax benefit was recorded ......             --                --             1,182
Temporary differences for which no
    tax benefit was recorded ....................             --                --               252
Other ...........................................            258                55               105
                                                     -----------       -----------       -----------
Actual income tax provision .....................    $    16,342       $       745       $     2,227
                                                     -----------       -----------       -----------
Effective tax rate ..............................           29.4%              2.5%            784.0%
</TABLE>


At December 31, 1998, the Company had available research and development credit
carryforwards of $4.4 million, which will begin to expire in the year 2007.

The Company has not provided for federal income taxes on $13.1 million of
undistributed earnings of its foreign subsidiaries that have been reinvested in
their operations.

NOTE G -- INVENTORIES

        The components of inventories are:


<TABLE>
<CAPTION>
                              DECEMBER 31,
                       --------------------------
                          1998           1997  
                       --------------------------
                              (thousands)
<S>                    <C>            <C>        
Raw materials ......   $     3,830    $     3,738
Work in process ....         2,064          2,448
Finished goods .....         6,978          5,095
                       -----------    -----------
                       $    12,872    $    11,281
                       ===========    ===========
</TABLE>


                                      F-13


<PAGE>   56
NOTE H -- PROPERTY AND EQUIPMENT

        Property and equipment consist of the following:


<TABLE>
<CAPTION>
                                                              DECEMBER 31,
                                                       ----------------------------
                                                          1998             1997  
                                                       ----------------------------
                                                              (thousands)
<S>                                                    <C>              <C>        
Manufacturing and development equipment ..........     $    23,024      $    17,645
Furniture and office equipment ...................           9,677            7,773
Demonstration equipment ..........................           4,038            3,964
Leasehold improvements ...........................           1,953            1,397
                                                       -----------      -----------
                                                            38,692           30,779

Less, accumulated depreciation and amortization ..         (25,833)         (20,938)
                                                       -----------      -----------
                                                       $    12,859      $     9,841
                                                       ===========      ===========
</TABLE>


NOTE I -- LINES OF CREDIT

        In July 1998, the Company renewed its credit facility with a U.S. bank
and increased the maximum line of credit available thereunder from $10.0 million
to $15.0 million. The Company also has lines of credit aggregating $3.9 million
available to its Japanese subsidiary from various Japan-based banks.

        The Company's $15.0 million credit facility is collateralized by
substantially all of the Company's assets, bears interest at, or in some cases
below, the lender's prime rate (7.75% at December 31, 1998), and expires on June
30, 2000, if not renewed. Under the terms of this facility, the Company is
required to maintain certain financial ratios and meet certain net worth and
indebtedness tests for which the Company is in compliance. There have been no
borrowings under this credit facility.

        The Company's Japanese subsidiary has collateralized yen-denominated
lines of credit with Japan-based banks, primarily available for use in Japan,
amounting to the equivalent of $3.9 million with interest at the Japanese prime
rate (1.5% at December 31, 1998) plus 0.125% per annum, which expire between
August 5, 1999 and March 31, 2000, if not renewed. There have been no borrowings
under these lines of credit.

NOTE J -- COMMITMENTS AND CONTINGENCIES

        The Company leases its office and manufacturing facilities together with
certain office equipment under operating lease agreements. Lease terms generally
range from one to ten years; certain building leases contain options for renewal
for additional periods and are subject to increases up to 10% every 24 months.


                                      F-14


<PAGE>   57
        Total rent expense was $2.5 million, $2.5 million and $2.4 million for
1998, 1997 and 1996, respectively.

        Minimum annual noncancelable lease commitments at December 31, 1998 are:


<TABLE>
<CAPTION>
For the Years Ending December 31,
- ---------------------------------                              (thousands)
<S>                                                            <C>        
1999 .......................................................   $     2,476
2000 .......................................................         2,940
2001 .......................................................         2,729
2002 .......................................................         2,730
2003 .......................................................         2,797
Thereafter .................................................        13,427
                                                               -----------
                                                               $    27,099
                                                               ===========
</TABLE>


NOTE K -- STOCK OPTIONS AND EMPLOYEE BENEFIT PLANS

        The Company has various stock option plans with maximum terms of ten
years under which 29.1 million shares of the Company's Common Stock have been
issued or reserved for issuance. The terms of options granted under these option
plans are determined at the time of grant, generally vest ratably over a three-
to five-year period, and in any case the option price may not be less than the
fair market value per share on the date of grant. Both incentive stock options
and nonstatutory stock options can be issued under the option plans.

        The Company also has Employee Stock Purchase Plans ("ESPP"), with
maximum terms of ten years, the latest of which expires in the year 2006, and
under which 800,000 shares of the Company's Common Stock have been authorized
and reserved for issuance. Eligible employees may authorize payroll deductions
of up to 10% of their compensation to purchase shares of Common Stock at 85% of
the lower of the market price per share at the beginning or end of each
six-month offering period.


                                      F-15


<PAGE>   58
        Statement of Financial Accounting Standards No. 123, "Accounting for
Stock-Based Compensation" ("SFAS 123"), encourages but does not require
companies to record compensation cost for stock-based employee compensation
plans at fair value for awards granted subsequent to December 31, 1995. The
Company has chosen to continue to account for stock-based compensation using the
intrinsic value method prescribed in Accounting Principles Board Opinion No. 25
"Accounting for Stock Issued to Employees," and related interpretations.
Accordingly, no compensation expense has been recognized for the Company's stock
option and purchase plans. Had compensation costs under these plans been
determined based upon the methodology prescribed under SFAS 123, the Company's
net income (loss) and diluted earnings (loss) per share would approximate the
following proforma amounts (in thousands except per-share data):


<TABLE>
<CAPTION>
                                        As Reported         Proforma
                                        ----------         ----------
<S>                                     <C>                <C>       
YEAR ENDED DECEMBER 31, 1998:
    Net income ......................   $   39,209         $   32,836
    Earnings per share (diluted) ....         0.67               0.56

Year Ended December 31, 1997:
    Net income ......................   $   28,996         $   26,646
    Earnings per share (diluted) ....         0.51               0.47

Year Ended December 31, 1996:
    Net loss ........................   $   (2,511)        $   (3,777)
    Loss per share (diluted) ........        (0.05)             (0.08)
</TABLE>


        The effects of applying SFAS 123 in this proforma disclosure are not
indicative of future amounts, and additional awards in future years are
anticipated.

        A summary of the status of the Company's stock options, as of December
31, 1998, 1997 and 1996, and the changes during the year ended on those dates
are presented below (shares in thousands):


<TABLE>
<CAPTION>
                                                        1998                      1997                       1996
                                                --------------------------------------------------------------------------
                                                            Wgtd. Avg.                 Wgtd. Avg.               Wgtd. Avg.
                                                Shares     Exer. Price     Shares     Exer. Price     Shares    Exer. Price
                                                ------     -----------     ------     -----------     ------    -----------
<S>                                             <C>        <C>             <C>        <C>             <C>       <C>    
Outstanding at beginning of year .......        8,298        $  4.50       9,672        $  2.43       9,352        $  2.07
Granted - price equals fair value ......        1,959          20.25       2,722           7.27       2,446           3.36
Granted - price greater than fair value           340          17.71         339          10.33       2,738           3.56
Exercised ..............................        1,838           2.88       3,777           1.87       1,380           1.00
Cancelled ..............................          321           8.15         658           3.72       3,484           3.56
                                                -----                      -----                      -----
Outstanding at year-end ................        8,438           8.90       8,298           4.50       9,672           2.43
                                                =====                      =====                      =====


Options exercisable at year-end.........        2,550                      2,273                      3,918
Options available for future grant......        3,528                      3,513                      1,992
Weighted average fair value of 
   options granted during the year:
    Exercise price equals fair value 
    at grant date ......................       $13.92                     $ 5.23                     $ 2.42
    Exercise price greater than fair 
    value at grant date.................        11.85                       6.89                       1.08
</TABLE>


                                      F-16


<PAGE>   59
        The following table summarizes information about stock options
outstanding at December 31, 1998 (shares in thousands):


<TABLE>
<CAPTION>
                                        Options Outstanding           Options Exercisable 
                            -------------------------------------   -------------------------
                                           Wgtd. Avg.
                              Number       Remaining    Wgtd.Avg.     Number      Wgtd. Avg.
                            Outstanding   Contractual   Exercise    Outstanding    Exercise
Range of Exercise Price     at 12/31/98       Life       Price      at 12/31/98     Price
- ---------------------------------------------------------------------------------------------
<S>                         <C>           <C>           <C>         <C>           <C>   
$0.66 to $ 0.99                  686          4.59      $ 0.86          609         $ 0.85
 1.00 to   3.78                1,940          6.86        3.10          815           3.14
 3.82 to   5.55                2,609          7.51        4.47          833           4.35
 7.07 to  10.63                  560          8.64        8.17          117           7.78
14.08 to  20.94                2,168          9.15       19.28          139          17.69
21.25 to  23.69                  475          9.36       21.96           37          22.36
                               -----                                  -----  
 0.66 to  23.69                8,438          7.72        8.90        2,550           4.27
                               =====                                  =====
</TABLE>


        The fair value of options granted during 1998, 1997 and 1996 is
estimated as $15.7 million, $6.9 million and $3.3 million, respectively, on the
dates of grants using the Black-Scholes option-pricing model with the following
assumptions: (i) dividend yield of 0%, (ii) expected volatility of 81%, 86% and
87%, respectively, for 1998, 1997 and 1996, (iii) weighted average risk-free
interest rates of 5.3%, 6.4% and 6.2% for 1998, 1997 and 1996, respectively,
(iv) weighted average expected life of 5.1 years, 5.1 years and 4.8 years for
1998, 1997 and 1996, respectively, and (v) assumed forfeiture rate of 50%, 58%
and 64%, respectively, for 1998, 1997 and 1996.

        During 1998, 1997 and 1996, approximately 103,000, 161,000 and 247,000
shares, respectively, were purchased under the Company's ESPP at weighted
average exercise prices of $13.94, $5.07 and $2.40, respectively. At December
31, 1998, 1997 and 1996 there were approximately 427,000, 530,000 and 691,000
shares, respectively, available for future grants. The weighted average fair
values of ESPP shares granted in 1998, 1997 and 1996 were $7.37, $2.23 and $1.18
per share, respectively.

        In 1997, the Company granted warrants to purchase 521,000 shares of
Common Stock. The grant date fair values of these warrants was $7.44 per share.
There were no warrants granted in 1998. See Note N.

        The Company has a 401(k) tax-deferred savings plan under which eligible
employees may authorize from 2% to 12% of their compensation to be invested in
employee-elected investment funds managed by an independent trustee. As
determined annually by the Board of Directors, the Company may contribute
matching funds of up to 50% of the employees' payroll deductions. During 1998,
1997 and 1996, the Company's contributions amounted to $654,000, $401,000 and
$187,000, respectively.


                                      F-17


<PAGE>   60
NOTE L --EARNINGS PER SHARE

        The following table provides a reconciliation of the numerators and
denominators of the basic and diluted per-share computations for the years ended
December 31, 1998, 1997 and 1996:


<TABLE>
<CAPTION>
                                                NET INCOME (LOSS)         SHARES            PER-SHARE
                                                  (NUMERATOR)         (DENOMINATOR)           AMOUNT
                                                -----------------------------------------------------
FOR THE YEAR ENDED DECEMBER 31, 1998:                     (thousands except per-share amount)
<S>                                             <C>                   <C>                   <C>     
Basic EPS ...........................             $ 39,209                53,518             $   0.73
Effect of Dilutive Securities - Stock
    Options and Warrants ............                   --                 5,190
                                                  --------              --------
Diluted EPS .........................             $ 39,209                58,708             $   0.67
                                                  ========              ========             ========

FOR THE YEAR ENDED DECEMBER 31, 1997:

Basic EPS ...........................             $ 28,996                50,408             $   0.58
Effect of Dilutive Securities - Stock
    Options and Warrants ............                   --                 6,434
                                                  --------              --------
Diluted EPS .........................             $ 28,996                56,842             $   0.51
                                                  ========              ========             ========

FOR THE YEAR ENDED DECEMBER 31, 1996:

Basic EPS ...........................             $ (2,511)               47,100             $  (0.05)
Effect of Dilutive Securities - Stock
    Options and Warrants ............                   --                    --
                                                  --------              --------
Diluted EPS .........................             $ (2,511)               47,100             $  (0.05)
                                                  ========              ========             ========
</TABLE>


        The computation of diluted number of shares excludes unexercised stock
options and warrants that are anti-dilutive. The numbers of such shares excluded
were 1.3 million, 89,000 and 9.9 million for the years ended December 31, 1998,
1997 and 1996, respectively.

        There were no transactions subsequent to December 31, 1998, which, had
they occurred prior to December 31, 1998, would have changed materially the
number of shares in the basic or diluted earnings per share computations.


                                      F-18


<PAGE>   61
NOTE M --OPERATING SEGMENT INFORMATION

        The Company has adopted Statement of Financial Accounting Standards
(SFAS) No. 131, "Disclosures about Segments of an Enterprise and Related
Information," which requires the reporting of certain financial information by
operating segment and geographical area. The Company's reportable operating
segments are strategic operating units that are managed separately due to their
different products or geographic location. The Network Switching operating
segment develops and supplies the Company's EAGLE product, a high-capacity
packet switching platform. The Intelligent Network Diagnostics operating segment
develops and supplies diagnostic products for intelligent networks. The Data
Network Diagnostics operating segment develops and supplies diagnostic products
for data networks (see Note P). The Japan Diagnostics operating segment sells
the Company's and third parties' diagnostic products to customers in Japan.
Transfers between operating segments are made at prices reflecting market
conditions. Geographic areas for which revenues from external customers are
reported are determined by the destination of the sale.


                                      F-19


<PAGE>   62
The Company's operating segments and geographical information are as follows (in
thousands):


OPERATING SEGMENTS


<TABLE>
<CAPTION>
                                                                 Net Sales             
                                            -------------------------------------------------------
                                               1998                   1997                   1996 
                                            -------------------------------------------------------
                                                                   (thousands)
<S>                                         <C>                    <C>                    <C>      
Network Switching .................         $ 116,259              $  71,941              $  25,359
Intelligent Network Diagnostics ...            33,116                 29,905                 20,790
Data Network Diagnostics ..........             8,100                 11,552                 15,427
Japan Diagnostics .................            21,981                 16,384                 15,746
Intercompany Eliminations .........            (2,787)                (4,642)                (5,196)
                                            ---------              ---------              ---------
    Total net sales ...............         $ 176,669              $ 125,140              $  72,126
                                            =========              =========              =========
</TABLE>


<TABLE>
<CAPTION>
                                                               Operating Income        
                                              ----------------------------------------------------
                                                1998                  1997                  1996 
                                              ----------------------------------------------------
                                                                  (thousands)
<S>                                           <C>                   <C>                   <C>      
Network Switching .................           $ 47,186              $ 22,591              $   (598)
Intelligent Network Diagnostics ...             11,544                11,956                 3,516
Data Network Diagnostics ..........             (3,466)               (2,196)               (1,656)
Japan Diagnostics .................              4,342                 3,450                 4,156
Intercompany Eliminations .........                283                   152                   102
General Corporate .................             (8,951)               (8,327)               (7,321)
                                              --------              --------              --------
    Total operating income (loss) .           $ 50,938              $ 27,626              $ (1,801)
                                              ========              ========              ========
</TABLE>

ENTERPRISE WIDE DISCLOSURES

The following table sets forth, for the periods indicated, revenues from
external customers by principal product line:


<TABLE>
<CAPTION>
                                                         1998                 1997                 1996 
                                                       --------------------------------------------------
<S>                                                    <C>                  <C>                  <C>     
Network Switching .............................        $116,259             $ 71,941             $ 25,359
Intelligent Network Diagnostics ...............          46,305               36,570               25,586
Data Network Diagnostics ......................          14,105               16,629               21,181
                                                       --------             --------             --------
    Total revenues from external customers ....        $176,669             $125,140             $ 72,126
                                                       ========             ========             ========
</TABLE>


The following table sets forth, for the periods indicated, revenues from
external customers by geographic territory:


<TABLE>
<CAPTION>
                                                         1998                 1997                 1996 
                                                       --------             --------             --------
<S>                                                    <C>                  <C>                  <C>     
North America .................................        $121,288             $ 91,404             $ 41,853
Japan .........................................          21,981               16,384               15,746
Europe ........................................           7,738                6,687                6,498
Rest of World .................................          25,662               10,665                8,029
                                                       --------             --------             --------
    Total revenues from external customers ....        $176,669             $125,140             $ 72,126
                                                       ========             ========             ========
</TABLE>


                                      F-20


<PAGE>   63
The following table sets forth, for the periods indicated, long-lived assets by
geographic area in which the Company holds assets:


<TABLE>
<CAPTION>
                               1998                1997                1996 
                             -----------------------------------------------
<S>                          <C>                 <C>                 <C>    
United States ......         $12,348             $ 9,370             $ 7,375
Japan ..............           1,216                 996               1,387
Other ..............              51                  --                  35
                             -------             -------             -------
    Total Assets ...         $13,615             $10,366             $ 8,797
                             =======             =======             =======
</TABLE>


There were no customers accounting for 10% or more of revenues in 1998. Sales to
one customer accounted for 23% of revenues in 1997 and included sales from the
Network Switching, Intelligent Network Diagnostics and Data Network Diagnostics
operating segments. Sales to one customer for the Japan Diagnostics operating
segment accounted for 12% of revenues in 1996.

NOTE N -- COMMON STOCK

        On July 6, 1998, the Company effected a two-for-one stock split. All
references to number of shares and per-share amounts have been restated to
reflect the stock split.

        At December 31, 1998 and 1997, the Company had warrants outstanding to
purchase an aggregate of 319,000 and 409,000 shares of its Common Stock,
respectively, as more fully discussed as follows.

        In July 1997, the Company issued warrants to purchase a total of 360,000
shares of its Common Stock to five directors and one corporate officer at $14.08
per share. These warrants vest and become exercisable in 12 equal quarterly
installments beginning on September 30, 1997. At December 31, 1997, 355,000 of
these warrants were outstanding. During 1998, 36,000 of these warrants were
exercised, and 319,000 were outstanding at December 31, 1998.

        In January 1997, the Company issued warrants to a director and corporate
officer to purchase 161,000 shares of its Common Stock at $4.67 per share, all
of which vested in 1997. At December 31, 1997, 54,000 of these warrants were
outstanding, all of which were exercised during 1998.

        In February 1998, the Company granted a restricted stock award of 30,000
shares of its Common Stock to a director and corporate officer in connection
with the commencement of his employment. The restricted shares vest in five
equal annual installments beginning in February 1999. This award was valued at
$607,000, which is being recognized as stock-based compensation expense over the
term of the award.

        In January 1998, the Company granted a restricted stock award for an
aggregate of 15,000 shares of its Common Stock to its five non-employee
directors. The restricted shares became fully vested in January 1999. This award
was valued at $240,000, all of which was recognized as stock-based compensation
expense in 1998.


                                      F-21


<PAGE>   64
NOTE O -- QUARTERLY FINANCIAL SUMMARY (UNAUDITED)


<TABLE>
<CAPTION>
For the Years Ended December 31,                                              QUARTERS
                                                  First              Second               Third              Fourth
                                               ----------------------------------------------------------------------
                                                                (thousands, except per-share data)
<S>                                            <C>                 <C>                 <C>                 <C>       
1998
Revenues ...............................       $   34,908          $   42,949          $   49,658          $   49,154
Gross profit ...........................           23,503              28,818              32,998              32,448
Income before provision for income
 taxes .................................           10,735              13,488              16,734              14,594
Net income .............................            6,656               8,365              10,372              13,816
Earnings per share:
    Basic ..............................       $     0.13          $     0.16          $     0.19          $     0.26
    Diluted ............................             0.11                0.14                0.18                0.24


1997
Revenues ...............................       $   20,577          $   25,077          $   36,112          $   43,374
Gross profit ...........................           13,899              16,065              23,763              29,889
Income before provision for income
  taxes ................................            2,397               3,846               9,532              13,966
Net income .............................            1,628               3,370              15,061               8,937
Earnings per share:
    Basic ..............................       $     0.03          $     0.07          $     0.30          $     0.17
    Diluted ............................             0.03                0.06                0.26                0.15
</TABLE>


        Tekelec typically operates with a limited backlog, and most of its
revenues in each quarter result from orders received in that quarter. Further,
Tekelec typically generates a significant portion of its revenues for each
quarter in the last month of the quarter. Tekelec establishes its expenditure
levels based on its expectations as to future revenues, and if revenue levels
were to fall below expectations this would cause expenses to be
disproportionately high. Therefore, a drop in near-term demand would
significantly affect revenues, causing a disproportionate reduction in profits
or even losses in a quarter. Tekelec's quarterly operating results may fluctuate
as a result of a number of factors, including general economic and political
conditions (such as recessions in the U.S. and Japan), capital spending patterns
of Tekelec's customers, including shifts in such patterns as a result of
customers' deferral of product purchases until the year 2000, increased
competition, variations in the mix of sales, fluctuation in proportion of
foreign sales, and announcements of new products by Tekelec or its competitors.

NOTE P -- SUBSEQUENT EVENT

        In January 1999, the Company announced a plan to scale down its Data
Network Diagnostics Division and integrate the division into its Intelligent
Network Diagnostics Division. In connection with this activity the Company will
record a charge of approximately $1.8 million in the first quarter of 1999,
which includes a workforce reduction of 25 employees and the write-off of
certain assets related to the Data Network Diagnostics Division.


                                      F-22


<PAGE>   65

       REPORT OF INDEPENDENT ACCOUNTANTS ON FINANCIAL STATEMENT SCHEDULE


To The Shareholders And Board Of Directors Of Tekelec



Our report on the consolidated financial statements of Tekelec and its
subsidiaries is included on page F-1 of this Form 10-K. In connection with our
audits of such financial statements, we have audited the related financial
statement schedule at December 31, 1998, 1997 and 1996 and for each of the three
years in the period ended December 31, 1998, as included on page S-2 of this
Form 10-K.

In our opinion, the financial statement schedule referred to above, when
considered in relation to the basic financial statements taken as a whole,
presents fairly, in all material respects, the information required to be
included therein.






/s/
PricewaterhouseCoopers LLP
Woodland Hills, California
February 2, 1999


                                      S-1


<PAGE>   66
                                                                     SCHEDULE II

                                           TEKELEC
                        VALUATION AND QUALIFYING ACCOUNTS AND RESERVES


<TABLE>
<CAPTION>
  Column A                                   Column B                    Column C                    Column D            Column E
- ---------------------------------------------------------------------------------------------------------------------------------
                                                                        Additions
                                            Balance at         Charged to        Charged to         Deductions           Balance at
                                            Beginning          Costs and           Other             and other             End of
Description                                 of Period           Expenses          Accounts          Adjustments            Period
- ---------------------------------------------------------------------------------------------------------------------------------
                                                                       (thousands)
<S>                                          <C>                 <C>                 <C>              <C>                 <C>    
Year ended December 31, 1996:

Allowance for doubtful accounts              $   391             $    --             $ --             $    23             $   368
Product warranty ...............                 879               1,083               --                 407               1,555
Inventory provision ............               1,165                 391               --                 241               1,315
Deferred tax valuation allowance              10,271               4,719               --                  --              14,990

Year ended December 31, 1997:

Allowance for doubtful accounts              $   368             $   101             $ --             $    --             $   469
Product warranty ...............               1,555                 655               --                 990               1,220
Inventory provision ............               1,315                 775               --                 750               1,340
Deferred tax valuation allowance              14,990                  --               --              12,742               2,248

Year ended December 31, 1998:

Allowance for doubtful accounts              $   469             $   475             $ --             $   181             $   763
Product warranty ...............               1,220               2,388               --               1,261               2,347
Inventory provision ............               1,340               1,021               --                 621               1,740
Deferred tax valuation allowance               2,248                  --               --               2,248                  --
</TABLE>


                                      S-2


<PAGE>   67
                                  EXHIBIT INDEX


<TABLE>
<CAPTION>
                                                                               Sequentially
Exhibit                                                                         Numbered
Number                        Description                                         Page
- ------                        -----------                                         ----
<S>        <C>                                                                 <C>
10.7       Schedule of Distributors.................................

10.8       Amendment No. 1 to Tekelec Officer Severance Plan dated 
           March 8, 1999............................................

10.16      Lease dated as of November 6, 1998 between the Registrant 
           and Weeks Realty, L.P., covering the Company's facilities 
           in Morrisville, North Carolina...........................

10.17      Employment Offer Letter dated January 13, 1999 between 
           the Registrant and Teresa Pippin..........................


21.1       Subsidiaries of the Registrant...........................

23.1       Consent of PricewaterhouseCoopers LLP....................

27.1       Financial Data Schedule for the year ended
           December 31, 1998........................................
</TABLE>



<PAGE>   1
                                     TEKELEC
                            SCHEDULE OF DISTRIBUTORS
                        SUBJECT TO STANDARD INTERNATIONAL
                             DISTRIBUTION AGREEMENT


<TABLE>
<S>                                               <C>
DISTRIBUTOR                                       TERRITORY

Altech Instruments Pty, Ltd.                      South Africa
Bynet                                             Israel
Eagle Telecom                                     Puerto Rico
Etek                                              Columbia
Euro Tech Far East, Ltd.                          Hong Kong
Grupo Ingedigit                                   Venezuela
Heli-Ocean Technology                             Taiwan
HITECH                                            Brazil
Industrial Electro-Communications, Inc.           Philippines
KDC Corporation                                   South Korea
Lagercrantz Communication                         Sweden
Medcom, S.A. de C.V.                              Mexico
MIBO Integra                                      Slovenia
Nichecom                                          New Zealand
Pernec Corp.                                      Malaysia
PT Tridaya Setiamanungeal                         Indonesia
Reycom Electronica SRL                            Argentina
Sintel                                            Norway, Denmark
Sirretta LTD                                      Great Britain
ST Computer Systems                               Singapore
Tecono Oy                                         Finland, Baltics
Tekelec Airtronic SPA                             Italy
Tekelec Airtronic B.V.                            The Netherlands,Luxembourg,Belgium
Tekelec Airtronic GMBH                            Germany
Tekelec-Airtronic, S.A.                           France
Tekelec Australia, Pty. Ltd.                      Australia
Tekelec China                                     China
Tekelec Espana, SA                                Spain and Portugal
Tenet                                             India
Twintech Design Co. Ltd.                          Thailand
</TABLE>



<PAGE>   1
                                                                    EXHIBIT 10.8



                               AMENDMENT NO. 1 TO
                                     TEKELEC
                             OFFICER SEVERANCE PLAN


                  Section(d) of the Tekelec Officer Severance Plan is hereby
amended to read in its entirety as follows:

                  "(d) (i) If in connection with, or within two years following,
                  a Change in Control of the Company, (A) an Eligible Officer's
                  employment with the Company (or the Acquiror) is terminated by
                  the Company (or the Acquiror) without Cause or (B) an Eligible
                  Officer terminates his/her employment with the Company (or the
                  Acquiror) for "Good Reason," then all of such Eligible
                  Officer's then unvested options and other rights to purchase
                  or acquire securities or other property of the Company or the
                  Acquiror (including but not limited to any options or rights
                  assumed by the Acquiror in connection with the Change in
                  Control), other than any such options or rights that were
                  granted after the effective date of the Change in Control,
                  shall automatically vest and become immediately exercisable in
                  full and all of such Eligible Officer's options and rights to
                  purchase securities or other property of the Company and/or
                  the Acquiror (other than any such options and rights that are
                  granted after the effective date of the Change in Control,
                  which options and rights shall be governed by the terms
                  thereof) shall be exercisable for a period of one year
                  following the effective date of such Eligible Officer's
                  termination of employment with the Company or the Acquiror, as
                  the case may be (notwithstanding any terms or provisions to
                  the contrary in any applicable stock option plan, stock option
                  agreement or other plan or agreement); provided, however, that
                  any such option or other right shall not be exercisable after
                  the expiration of the term of such option or other right set
                  forth in the option agreement or other agreement evidencing
                  such right.

                           (ii) If in connection with a Change in Control of the
                  Company described in Section 2(e)(iii) of this Plan, an
                  Eligible Officer is not offered, at least ten days prior to
                  the effective date of such Change in Control, employment with
                  the Acquiror after the effective date of the Change in Control
                  on terms and conditions generally no less favorable to the
                  Eligible Officer than the terms and conditions of his/her

<PAGE>   2

                  employment in effect with the Company immediately prior to the
                  effective date of the Change in Control, then all of such
                  Eligible Officer's unvested options and other rights to
                  purchase or acquire the Company's securities that are
                  outstanding immediately prior to the effective date of the
                  Change in Control shall automatically vest and become
                  immediately exercisable in full and all of such Eligible
                  Officer's options and rights to purchase or acquire the
                  Company's securities that are outstanding immediately prior to
                  the effective date of the Change in Control shall be
                  exercisable for a period of one year following the effective
                  date of such Change in Control (notwithstanding any terms or
                  provisions to the contrary in any applicable stock option
                  plan, stock option agreement or other plan or agreement);
                  provided, however, that any such option or other right shall
                  not be exercisable after the expiration of the term of such
                  option or other right set forth in the option agreement or
                  other agreement evidencing such right."



Dated:   March 8, 1999


<PAGE>   1
                                                               EXHIBIT 10.16


                         LEASE AGREEMENT BY AND BETWEEN
                               TEKELEC, as Tenant
                                       AND
                         WEEKS REALTY, L.P., as Landlord
                        PARAMOUNT CENTER, MORRISVILLE, NC


<PAGE>   2
                                TABLE OF CONTENTS

1.      PREMISES AND TERM.

2.      BASE RENT, TAXES, INSURANCE, COMMON AREA MAINTENANCE, AND SECURITY
        DEPOSIT.

3.      COMPLIANCE WITH LAWS AND USE.

4.      REPAIR AND MAINTENANCE.

5.      ALTERATIONS.

6.      SIGNS.

7.      INSPECTION.

8.      UTILITIES.

9.      ASSIGNMENT AND SUBLETTING.

10.     FIRE AND CASUALTY DAMAGE.

11.     LIABILITY.

12.     CONDEMNATION.

13.     HOLDING OVER.

14.     QUIET ENJOYMENT.

15.     EVENTS OF DEFAULT.

16.     REMEDIES.

17.     LANDLORD'S LIEN.

18.     MORTGAGES.

19.     MECHANIC'S LIENS.

20.     NOTICES.

21.     BROKER'S CLAUSE.

22.     LANDLORD'S LIABILITY.

23.     RULES AND REGULATIONS.

24.     HAZARDOUS MATERIALS.

25.     [INTENTIONALLY DELETED.]

26.     COVENANT OF TENANT.

27.     MISCELLANEOUS.


                                       i


<PAGE>   3
EXHIBIT A- THE LAND

EXHIBIT B- FLOOR PLAN

EXHIBIT C- PLANS AND SPECIFICATIONS

EXHIBIT C-1 - SCHEDULE

EXHIBIT C-2 - DESIGN CRITERIA

EXHIBIT D- RULES AND REGULATIONS

EXHIBIT E- ADJACENT PROPERTY 


                                       ii


<PAGE>   4
                                LEASE AGREEMENT

        THIS LEASE AGREEMENT (the "Lease"), is made and entered into as of the
6th day of November, 1998, by and between TEKELEC, a California corporation (the
"Tenant"), and WEEKS REALTY, L.P., a Georgia limited partnership authorized to
do business in North Carolina as WEEKS REALTY LIMITED PARTNERSHIP (the
"Landlord").

                              W I T N E S S E T H:

        1. PREMISES AND TERM. In consideration of the obligation of Tenant to
pay rent as herein provided, and in consideration of the other terms, provisions
and covenants hereof, Landlord hereby leases to Tenant and Tenant hereby leases
from Landlord, certain premises comprised of 152,372 rentable square feet in a
building to be constructed in a development known as Paramount Center,
Morrisville, NC (the "Building") situated on certain land (the "Land") in the
County of Wake, State of North Carolina, more particularly described on Exhibit
A, attached hereto and incorporated herein by reference, together with all
rights, privileges, easements, appurtenances and immunities belonging to or in
any way pertaining to the premises (hereinafter referred to as the "Premises").
The obligations of Tenant shall commence hereunder upon the Commencement Date
and the delivery of the Premises by Landlord to Tenant.

        A floor plan of the Premises is attached hereto and made a part hereof
as Exhibit B. Except as expressly set forth herein, the Premises are leased by
Tenant "as is". Any upfit performed by Landlord to prepare the Premises for
occupancy by Tenant shall be conducted in a good and workmanlike manner. The
taking of possession by Tenant shall be deemed conclusively to establish that
the Premises and any improvements thereto are in good and satisfactory condition
as of when possession was taken. Tenant further acknowledges that no
representations as to the repair of the Premises, nor promises to alter, remodel
or improve the Premises have been made by Landlord, unless such representations
or promises are expressly set forth in this Lease. Within five days of the
Commencement Date, Tenant shall, upon demand of Landlord, execute and deliver to
Landlord a letter of acceptance of delivery of the Premises, acknowledging the
Commencement Date and Termination Date, the square footage leased, the square
footage of the Building, and the dates for increase in payment of base rent
hereunder. The Letter shall reflect an adjustment of the Commencement Date and
the Termination Date hereunder to reflect the corrected dates for purposes of
this Lease in the event the Premises are not occupied on the Commencement Date
provided in this Lease.

        Notwithstanding anything to the contrary contained herein, Tenant shall
not be required to take any corrective action with respect to any condition or
design which constitutes a latent defect in the Premises by virtue of Tenant's
acceptance of the Premises. If any latent defect affects Tenant's quiet
enjoyment of the Premises, constitutes a dangerous condition or is required to
be corrected by law, then Landlord will undertake the appropriate corrective
action at Landlord's cost. As between Landlord and Tenant, nothing in this
paragraph shall be construed to impose on Tenant or subject Tenant to any
liability to any third party for injury to property or persons arising out of
latent defects unless such latent defects were created by Tenant or its
employees, agents or contractors in the course of repair work or physical
improvements or alterations to the Premises performed by Tenant or its
employees, agents or contractors. As between Landlord and Tenant, nothing in
this paragraph shall be construed to impose on Landlord or subject Landlord to
any liability to any third party for injury to property or persons arising out
of latent defects unless such latent defects were created by Landlord or its
employees, agents or contractors in the course of construction of the upfit of
the Premises by Landlord, its employees, agents or contractors.

        All upfit of the Premises shall be performed by Landlord in accordance
with plans and specifications for the Premises (the "Plans") which are subject
to the approval of Landlord and Tenant, a copy of which shall be attached hereto
and made a part hereof as Exhibit C. Landlord shall provide Tenant with an
allowance in an amount up to .50 per rentable square foot of the Premises for
use by Tenant in its obtaining drawings for the upfit of the Premises. The
drawings obtained by Tenant are subject to the review and approval of Landlord.
The contractor of Landlord shall use reasonable efforts to solicit three bids
from subcontractors for each of the major trades performing upfit of the
Premises, including, mechanical, electrical, plumbing, and drywall.


                                       1


<PAGE>   5
        Landlord shall provide Tenant with an upfit allowance for the Premises
in the amount of $20.00 per rentable square foot of the Premises (the "Upfit
Allowance"). The Upfit Allowance shall be used to upfit the Premises based upon
the provisions of Exhibit C. The base building design shall be in accordance
with the Design Criteria, attached hereto and made a part hereof as Exhibit C-2.
Should the upfit costs for the Premises be less than the Upfit Allowance, Tenant
shall be allowed to upgrade the improvements to the Premises, as reasonably
approved by Landlord, to fully utilize the entire Upfit Allowance, to apply any
or all of the remaining Upfit Allowance to the costs of Tenant for architectural
fees, or Tenant may elect to have Landlord apply the remaining Upfit Allowance
(together with the reduced financing costs and commissions of Landlord)
multiplied by a factor of eleven and one quarter percent (11.25%) to reduce the
base rent due hereunder, proportionately over the entire Lease term, all as
reasonably determined by Landlord. Should the upfit costs for the Premises be
greater than the Upfit Allowance, the excess over the Upfit Allowance up to an
amount equal to $25.00 per rentable square foot of the Premises (together with
the financing costs and commissions of Landlord) shall be amortized and repaid
plus interest at a rate of ten and one-half percent (10.5%) per annum,
proportionately over the entire Lease term as Additional Rent, all as reasonably
determined by Landlord (and any current increases in base rent each year shall
remain at the same percentage increase). Any cost and expense incurred by
Landlord in upfitting the Premises in excess of $25.00 per rentable square foot
of the Premises (the "Excess") shall be borne by Tenant and payable by Tenant to
Landlord within thirty days of demand by Landlord to Tenant. Failure by Tenant
to pay the Excess upon demand as aforesaid is an event of default hereunder, and
in addition, to all other remedies available to Landlord at law, or in equity
for such event of default, Landlord may recover from Tenant the cost it incurs
in preparing the Premises for another tenant which amount shall be reduced by
any amounts that Landlord may recoup from a new tenant.

        Attached hereto as Exhibit C-1 is a schedule for the upfit of the
Premises, including the dates by which Tenant must make certain decisions
regarding the Premises (the "Schedule"). Landlord and Tenant shall use diligent
good faith efforts to ensure construction of the Premises remains on schedule in
accordance with the Schedule, provided, however, that in no event shall the
failure of Landlord to deliver the Premises to Tenant on or prior to the
Commencement Date (as hereinafter defined) constitute a default by Landlord
under this Lease.

        TO HAVE AND TO HOLD the same for a term commencing on the date a
temporary certificate of occupancy is issued for the Premises (the "Commencement
Date"), and ending on the date that is one hundred and twenty months (120)
thereafter, unless sooner terminated pursuant to the provisions hereof (the
"Termination Date"). The Commencement Date and Termination Date shall be
extended due to delays beyond the control of Landlord, including, but not
limited to, acts or omissions of Tenant, force majeure, delays in obtaining
permits, licenses or other approvals, acts of God, delays caused by Tenant,
and/or inclement weather, including site conditions or winter weather that
prohibit or adversely affect construction (the "Excused Delays"). In the event
the Commencement Date has not occurred by November 1, 1999 due to acts or
omissions of Landlord (with such date being extended for any Excused Delays),
Landlord shall credit against the first installment(s) of base rent due
hereunder from Tenant an amount equal to one day's base rent for each day the
Commencement Date is delayed. In the event the Commencement Date has not
occurred by November 1, 1999 due to acts or omissions of Tenant (with such date
being extended for any Excused Delays), Landlord shall receive from Tenant on
the Commencement Date an amount equal to one day's base rent for each day the
Commencement Date is delayed. The aforesaid monetary amounts shall act as a sole
and exclusive remedy to each party hereto for any delay in the Commencement
Date.

        Option to Renew. Provided there is no default or event of default by
Tenant under the Lease, Tenant shall have the option to renew the term of the
Lease for one renewal term of five years (the "Renewal Term") at the then
prevailing market rate, as determined by Landlord provided Tenant shall provide
Landlord written notice of its desire to renew the term of the Lease at least
nine months prior to the Termination Date. Failure of Tenant to provide Landlord
with the aforesaid written notice shall render the rights of Tenant to renew or
extend the term of this Lease null and void. Upon the exercise by Tenant of its
option to renew, all of the terms and conditions of this Lease shall apply with
base rent being the then prevailing market rate, and


                                       2


<PAGE>   6
Tenant shall have no further rights to renew or extend the term of this Lease.
The date of the commencement of the Renewal Term shall be the date after the end
of the current Lease term.

        Right to Terminate Prior Leases. Effective the Commencement Date herein
and provided that (i) there is no default or event of default under this Lease,
the Lease by and between Landlord and Tenant for Enterprise Center II dated
February 24, 1995 (the Lease, and all amendments thereto shall be referred to
herein collectively as the "Enterprise II Lease"), or the Lease by and between
Landlord and Tenant for Enterprise Center IV dated July 28, 1998 (the Lease and
all amendments thereto shall be referred to herein collectively as "Enterprise
IV Lease"), and (ii) Tenant shall have entered into occupancy of the Premises
upon delivery of same by Landlord as provided herein, Landlord will (1)
terminate the Enterprise IV Lease and the Enterprise II Lease, and (2) release
Tenant from any and all of its obligations under the Enterprise II and IV Leases
(other than the obligation of Tenant to pay rent and all other obligations
thereunder until the termination of each such Lease at the rates and in the
amounts then in effect under such Leases, and any other obligations that
expressly survive such termination, as provided in such Leases).

        Adjacent Land. During calendar year 1999 for so long as there shall be
no default or event of default under the Lease by Tenant, Landlord shall refrain
from leasing to a third party certain land of Landlord located adjacent to the
Land as more particularly described on Exhibit E, attached hereto and made a
part hereof (the "Adjacent Property"). During calendar year 2000 for so long as
there shall be no default or event of default under the Lease by Tenant and
provided Tenant shall pay the interest charges of Landlord and the ad valorem
taxes of Landlord for the Adjacent Property, Landlord shall refrain from leasing
the Adjacent Property to a third party. During calendar year 2001 for so long as
there shall be no default or event of default under the Lease by Tenant, and
provided Tenant shall continue to pay the interest charges of Landlord and the
ad valorem taxes of Landlord for the Adjacent Property and in addition, Tenant
shall pay Landlord an amount equal to an eleven percent (11%) return on the
investment of Landlord in the Adjacent Property, as reasonably determined by
Landlord, Landlord shall refrain from leasing the Adjacent Property to a third
party. Failure of Tenant to comply strictly with any of the aforesaid conditions
precedent shall render null and void all rights of Tenant hereunder with respect
to the Adjacent Property, and Landlord may lease the Adjacent Property without
any obligation or liability to Tenant. Should Tenant fail to lease the Adjacent
Property on or prior to December 31, 2001, Tenant shall have no further rights
with respect thereto and Landlord may lease the Adjacent Property without any
obligation or liability to Tenant.

2.      BASE RENT, TAXES, INSURANCE, LAWN DRIVEWAY AND PAVED PARKING AREA
        MAINTENANCE, SECURITY DEPOSIT.

                (a) Tenant agrees to make monthly payments of base rent to
        Landlord for the Premises ("base rent"), in advance, without demand,
        deduction or offset, in lawful money of the United States, at an annual
        rate in the following amounts:

            Year 1 $11.95 per rentable square foot of the Premises.

            Year 2 $11.95 per rentable square foot of the Premises.

            Year 3 $12.31 per rentable square foot of the Premises.

            Year 4 $12.68 per rentable square foot of the Premises.

            Year 5 $13.06 per rentable square foot of the Premises.

            Year 6 $13.45 per rentable square foot of the Premises.

            Year 7 $13.85 per rentable square foot of the Premises.

            Year 8 $14.27 per rentable square foot of the Premises.

            Year 9 $14.70 per rentable square foot of the Premises.

            Year 10 $15.14 per rentable square foot of the Premises.

                Rent payments for any fractional calendar month at the end, or
        the beginning of the term of the Lease, shall be prorated.

                The first lease year hereunder shall commence on the
        Commencement Date and shall end on the last day of the twelfth full
        calendar month thereafter. The first lease year shall include the first
        twelve (12) full calendar months of the term and any partial calendar
        month occasioned by the commencement of rent on a date other than the
        first


                                       3


<PAGE>   7
        day of a calendar month. Each successive lease year shall commence on
        the anniversary date of the first day of the first full calendar month
        of the first lease year.

        (b) TAXES

                Beginning on the Commencement Date and continuing for the entire
        term hereof, Tenant shall pay to Landlord, as additional rental,
        Tenant's pro rata share of all taxes, assessments and governmental
        charges of any kind or nature whatsoever levied or assessed against the
        Land and the Building by any municipality, county, or other governmental
        agency (the "TAXES"), which shall be based upon the ratio of the
        rentable square footage of the Building occupied by Tenant to the total
        rentable square footage of the Building. Tenant shall pay its pro rata
        share of the Taxes in advance in equal monthly installments in such
        amounts as are reasonably estimated for each year by Landlord at the
        beginning of each calendar year during the term, each such installment
        being made along with payments of base rent hereunder. Tenant's share of
        Taxes for the initial year of the term is estimated by Landlord to be
        $.84 per square foot per year or $10,666.04 per month. Landlord shall
        promptly notify Tenant of the total actual taxes assessed against the
        Land and the Building, attaching a copy of the tax or special assessment
        bill and shall specify (i) Tenant's pro rata share thereof, and (ii) the
        excess, if any, of Tenant's pro rata share over Landlord's estimation of
        Taxes for such tax year. Tenant shall pay the excess amount so specified
        to Landlord within fifteen (15) days following receipt by Tenant of
        Landlord's letter. Failure by Tenant to pay Landlord such amount within
        the period designated shall constitute a non-payment of rent by Tenant
        and a default of Tenant's obligation under the Lease, and Landlord shall
        be entitled to all remedies provided for in this Lease upon default in
        payment of rent. If the first year for which Tenant's pro rata share of
        the Taxes are due or the final year of the term hereof do not coincide
        with the calendar year, Tenant's pro rata share of the Taxes for the
        portion of that year shall be prorated according to the number of months
        during which Tenant was in possession of the Premises. In the event
        Landlord's estimation of Taxes shall exceed the actual amount of Taxes,
        the amount paid by Tenant for such year shall be adjusted between
        Landlord and Tenant and Tenant shall receive a credit against the next
        due installment of rent hereunder in such excess amount unless this
        Lease has expired or been otherwise terminated, in which event Landlord
        shall pay to Tenant such excess amount within fifteen (15) days
        following receipt by Tenant of Landlord's letter.

                (c) INSURANCE

                Beginning on the Commencement Date and continuing for the entire
        term hereof, Tenant shall pay to Landlord, as additional rental,
        Tenant's pro rata share of the insurance premiums (the "Insurance
        Expense") for commercial general liability, fire and extended coverage
        on the Building and the Land, which shall be based upon the ratio of the
        rentable square footage of the Building to the total rentable square
        footage of the Building. Tenant shall pay its pro rata share of the
        Insurance Expense in advance in equal monthly installments in such
        amounts as are reasonably estimated by Landlord at the beginning of each
        calendar year during the term, each such installment being made along
        with payments of base rent hereunder. Tenant's pro rata share of the
        Insurance Expense for the initial year of the term is estimated by
        Landlord to be $.03 per square foot per year or $380.93 per month.
        Landlord shall promptly notify Tenant of the total amount of the actual
        Insurance Expense, and at Tenant's request, attaching a copy of the
        Insurance Expense invoice related thereto and shall specify (i) Tenant's
        pro rata share thereof, and (ii) the excess, if any, of Tenant's pro
        rata share over Landlord's estimation of the Insurance Expense for such
        year. Tenant shall pay the excess amount so specified to Landlord within
        fifteen (15) days following receipt by Tenant of Landlord's letter.
        Failure by Tenant to pay Landlord such amount within the period
        designated shall constitute a non-payment of rent by Tenant and a
        default of Tenant's obligation under the Lease, and Landlord shall be
        entitled to all remedies provided for in this Lease upon default in
        payment of rent. If the first year for which Tenant's pro rata share of
        the Insurance Expense is due or the final year of the term hereof do not
        coincide with the calendar year, Tenant's pro rata share of the
        Insurance Expense for the portion of that year shall be prorated
        according to the number of months during which Tenant was in


                                       4


<PAGE>   8
        possession of the Premises. In the event Landlord's estimation of the
        Insurance Expense shall exceed the actual amount of the Insurance
        Expense, the amount paid by Tenant for such year shall be adjusted
        between Landlord and Tenant and Tenant shall receive a credit against
        the next due installment of rent hereunder in such excess amount unless
        this Lease has expired or been otherwise terminated, in which event
        Landlord shall pay to Tenant such excess amount within fifteen (15) days
        following receipt by Tenant of Landlord's letter.

        (d)     LAWN, DRIVEWAY, INTERIOR COMMON AREA, AND PAVED PARKING AREA
                MAINTENANCE

                Beginning on the Commencement Date and continuing for the entire
        term hereof, Tenant shall pay to Landlord, as additional rental,
        Tenant's pro rata share of the cost to Landlord of the lawn, interior
        common area, and driveway and paved parking area maintenance related to
        the Land upon which the Premises are located (the "CAM Expense") which
        shall be based upon the ratio of the rentable square footage of the
        Building occupied by Tenant to the total rentable square footage of the
        Building. The CAM Expense shall include, without limitation, the costs
        of lawn maintenance, driveway and parking area maintenance for the
        Premises and for the streets and roadways providing access to the
        Building and the Land, management and supervisory fees, exterior
        lighting maintenance, snow removal, waste removal, repair and
        maintenance of paved areas, cleaning supplies, miscellaneous building
        supplies, sweeper brushes, supplies for materials used in common by all
        tenants of the complex in which the Premises are located, external paint
        for the Building, exterior and interior common area maintenance,
        elevator repair and maintenance, external plumbing for the Building,
        exterior lighting in common areas, insect and pest extermination,
        security guards for the complex in which the Premises are located, signs
        for the complex in which the Premises are located, fuel for vehicles and
        street sweepers used by Landlord in the complex in which the Premises
        are located and miscellaneous maintenance expenses. Tenant shall pay its
        pro rata share of the CAM Expense in advance in equal monthly
        installments in such amounts as are reasonably estimated for each year
        of the term of this Lease by Landlord at the beginning of each calendar
        year during the term, each such installment being made along with
        payments of base rent hereunder. Tenant's pro rata share of the CAM
        Expense for the initial year of the term is estimated by Landlord to be
        $1.71 per square foot per year or $21,713.01 per month. Failure by
        Tenant to pay Landlord said amount within the period designated shall
        constitute a non-payment of rent by Tenant and a default of Tenant's
        obligation under the Lease, and Landlord shall be entitled to all
        remedies provided for in this Lease upon default in payment of rent. In
        the event Landlord's estimation of the CAM Expense shall exceed the
        actual amount thereof, calculated on an annual basis, the amount paid
        by Tenant for such year shall be adjusted between Landlord and Tenant
        and Tenant shall receive a credit against the next due installment of
        rent hereunder in such excess amount unless this Lease has expired or
        been otherwise terminated, in which event Landlord shall pay to Tenant
        such excess amount within fifteen (15) days following the receipt by
        Tenant of Landlord's letter. Landlord shall notify Tenant on an annual
        basis of the actual CAM Expense of Tenant for the Premises.

        (e)     RECONCILIATION OF EXPENSES.

                Landlord shall promptly notify Tenant of the total actual (i)
        Taxes assessed against the Land and the Building, (ii) Insurance
        Expense, and (iii) CAM Expense, attaching a copy of the tax or special
        assessment bill, the insurance invoice, or the calculation of CAM
        Expense, as applicable, and shall specify (i) Tenant's pro rata share
        thereof, and (ii) the excess, if any, of Tenant's pro rata share over
        Landlord's estimation for each calendar year. Tenant shall pay the
        excess amount so specified to Landlord within fifteen (15) days
        following receipt by Tenant of Landlord's letter. Failure by Tenant to
        pay Landlord such amount within the period designated shall constitute a
        non-payment of rent by Tenant and a default of Tenant's obligation under
        the Lease, and Landlord shall be entitled to all remedies provided for
        in this Lease upon default in payment of rent. If the first year for
        which Tenant's pro rata share of Taxes, Insurance Expense, or CAM
        Expense (hereinafter collectively, the "Expenses") are due or the final


                                       5


<PAGE>   9
        year of the term hereof do not coincide with the calendar year, Tenant's
        pro rata share of Expenses for the portion of that year shall be
        prorated according to the number of months during which Tenant was in
        possession of the Premises. In the event Landlord's estimation of
        Expenses shall exceed the actual amount of Expenses, the amount paid by
        Tenant for such year shall be adjusted between Landlord and Tenant and
        Tenant shall receive a credit against the next due installment of rent
        hereunder in such excess amount unless this Lease has expired or been
        otherwise terminated, in which event Landlord shall pay to Tenant such
        excess amount within fifteen (15) days following receipt by Tenant of
        Landlord's letter.

        (f)     [INTENTIONALLY DELETED]

        (g)     PROVISIONS TO SURVIVE LEASE TERMINATION

                All outstanding obligations of Tenant under the provisions of
        this Section 2 shall survive the termination of the Lease, for whatever
        reason, or any extension or renewal hereof.

        3.      COMPLIANCE WITH LAWS AND USE.

                (a) The Premises shall be used only for the following purposes:
        for a service center, research and development, and light manufacturing,
        the operation of a cafeteria for use by its employees and visitors, and
        general office use related thereto. Tenant shall conduct no activity
        that will result in the discharge of harmful gases, affluents or other
        wastes or toxic substances. Outside storage, including, without
        limitation, trucks and other vehicles, is prohibited without Landlord's
        prior written consent, not to be unreasonably withheld. Tenant shall at
        its sole cost and expense obtain any and all business licenses and
        permits necessary for its use of the Premises. Tenant shall comply with
        all governmental laws, ordinances and regulations relating to the use of
        the Premises, and shall promptly comply with all governmental orders and
        directives for the correction, prevention and abatement of nuisances in
        or upon, or connected with, the Premises, all at Tenant's sole expense,
        only if caused by Tenant, its agents, employees, licensees, or invitees.
        Tenant shall not permit any objectionable or unpleasant odors, smoke,
        dust, gas, noise or vibrations to permeate in or emanate from the
        Premises, nor take any other action which would constitute a nuisance or
        would disturb or endanger any other tenants of the Building or
        unreasonably interfere with their respective premises. Without
        Landlord's prior written consent, Tenant shall not receive, store or
        otherwise handle any product, material or merchandise which is
        explosive, inflammable, combustible, corrosive, caustic or poisonous,
        other than in the normal course of its business, in which event, all
        such materials shall be handled in accordance with all applicable laws.
        Tenant will not permit the Premises to be used for any purpose or in any
        manner (including, without limitation, any method of storage) which
        would render the insurance thereon void or the insurance risk more
        hazardous or cause the State Board of Insurance or other insurance
        authority to disallow any sprinkler credits. Tenant shall give notice to
        Landlord immediately upon the occurrence of any accident in the Premises
        or upon Tenant's discovery of any defects thereon or in any fixtures or
        equipment located therein or upon the occurrence of any emergency in the
        Premises or the Building.

                (b) Tenant, at its expense, in its use of the Premises and in
        making any alterations, renovations, upfit or modifications of the
        Premises shall comply with all laws, ordinances, orders, rules and
        regulations of state, federal, municipal or other agencies or bodies
        having jurisdiction relating to the use, condition and occupancy of the
        Premises, including, but not limited to, the provisions of the Americans
        with Disabilities Act of 1990, as amended, and with recorded covenants,
        conditions and restrictions applicable for the Land and Building.

        4.      REPAIRS AND MAINTENANCE.

                (a) Landlord shall at its expense maintain only the roof,
        downspouts, gutters, foundation, utility lines located outside the
        Premises and the structural soundness of the


                                       6


<PAGE>   10
        exterior walls of the Building in good condition and repair in
        accordance with the standards for buildings of similar size and utility
        in Wake County, NC subject to reasonable wear and tear. Landlord shall
        wash the exterior windows of the Premises on a quarterly basis. Tenant
        shall repair, and pay for, any damage to the foregoing caused by the
        negligence of Tenant or Tenant's employees, agents or invitees, or
        caused by Tenant's default hereunder. The term "walls" as used herein
        shall not include windows, glass or plate glass, doors, special store
        fronts or office entries. Tenant shall immediately give Landlord written
        notice of defect or need for repairs, after which Landlord shall have
        reasonable opportunity to repair same or cure such defect. Landlord's
        liability with respect to any defects, repairs or maintenance for which
        Landlord is responsible under any of the provisions of this Lease shall
        be limited to the cost of such repairs or maintenance or the curing of
        such defect and any costs to repair any resultant damage to the trade
        fixtures of Tenant.

                (b) Tenant shall at its own cost and expense keep and maintain
        all parts of the Premises (except those for which Landlord is expressly
        responsible under the terms of this Lease) in good condition, promptly
        making all necessary repairs and replacements, including, but not
        limited to, windows, glass and plate glass, doors, any special office
        entry, interior walls, finish work, floors and floor covering, heating
        and air conditioning systems, dock boards, truck doors, dock bumpers,
        plumbing work and fixtures and regular removal of trash and debris.
        Tenant shall not be obligated to repair any casualty covered by the
        insurance to be maintained by Landlord pursuant to subparagraph 10(A)
        below. To the extent deemed necessary by Landlord, Landlord shall make
        available to Tenant for its use in effecting repairs, any warranties
        with respect to components of the Building.

                (c) Tenant shall enter into a maintenance contract providing for
        the periodic maintenance of all hot water, heating and air conditioning
        systems and units in the Premises, and removal and replacement of
        filters, and shall enter into a janitorial contract providing for the
        daily cleaning of the Premises. These contracts shall be with parties
        and upon such terms and conditions as shall be reasonably approved by
        Landlord. Tenant shall provide Landlord a copy of such contracts within
        thirty days of the Commencement Date.

                (d) Tenant shall not damage any demising wall of the Building,
        or disturb the integrity and support provided by any demising wall and
        shall, at its sole cost and expense, promptly repair any damage or
        injury to any demising wall caused by Tenant or its employees, agents or
        invitees.

                (e) Tenant and its employees, customers and licensees shall have
        the non-exclusive right to use the parking areas as may be designated by
        Landlord in writing, subject to reasonable rules and regulations as
        Landlord may from time to time prescribe and subject to rights of
        ingress and egress of other tenants. Parking shall be available at the
        Building for the non-exclusive use of Tenant at a ratio of five spaces
        per 1,000 rentable square feet. Included within this ratio shall be
        seven parking spaces located adjacent to the Building near the entrance
        to the Premises that shall be marked as spaces for visitors. Landlord
        shall not be responsible for enforcing Tenant's parking rights against
        any third parties. Landlord may require, at its option, in its sole
        discretion, that Tenant, its employees, invitees, and visitors use
        certain numbered spaces to be designated by Landlord.

        5.      ALTERATIONS. Tenant shall not make any alterations, additions or
        improvements to the Premises (including, but not limited to, roof and
        wall penetrations) without the prior written consent of Landlord, Tenant
        may, without the consent of Landlord, but at its own cost and expense
        and in a good workmanlike manner, erect such shelves, bins, machinery
        and trade fixtures as it may deem advisable, without altering the basic
        character or structure of the Premises or improvements and without
        overloading or damaging the Premises or improvements, and in each case
        complying with all applicable governmental laws, ordinances, regulations
        and other requirements. Tenant shall not make any alterations, additions
        or improvements to the Premises which will contravene


                                       7


<PAGE>   11
        Landlord's policies insuring against loss or damage by fire or other
        hazards, including but not limited to commercial general public
        liability, or which will prevent Landlord from securing such policies in
        companies acceptable to Landlord. If any such alterations, additions or
        improvements cause the rate of fire or other insurance on the Premises
        by companies acceptable to Landlord to be increased beyond the minimum
        rate from time to time applicable to the Premises for permitted uses
        thereof, Tenant shall pay as additional rent the amount of any such
        increase promptly upon demand by Landlord. Any and all alterations,
        additions, improvements, partitions and fixtures erected by Tenant shall
        be the property of Landlord and shall remain at the Premises upon
        termination of the Lease or upon earlier vacating of the Premises. All
        shelves, bins, machinery and trade fixtures installed by Tenant may be
        removed by Tenant prior to the termination of this Lease provided such
        removal may be accomplished without damage to the Premises or to the
        primary structure or structural qualities of the buildings and other
        improvements situated on the Premises. Tenant shall repair any damage to
        the Premises, or the Building as a result of any alteration, or repair
        by Tenant, its employees, agents, invitees, or contractors to the
        Premises.

        6.      SIGNS.

                (a) Tenant shall have the right to install signs upon the
        Premises only when first approved in writing by Landlord, such approval
        not to be unreasonably withheld, and subject to any applicable
        governmental laws, ordinances, regulations and other requirements.
        Tenant shall remove all such signs upon the termination of this Lease.
        Such installations and removals shall be made in such manner as to avoid
        injury or defacement of the Premises, and Tenant shall repair any injury
        or defacement, including, without limitation, discoloration of the
        Building caused by such installation and/or removal.

                (b) Included within the Upfit Allowance shall be signage for the
        Premises that shall include (i) a monument sign on the Land with the
        name of Tenant; and (ii) a sign on the exterior of the Premises. All
        signage shall be in form, substance, color, and shape, subject to the
        reasonable approval of Landlord.

        7.      INSPECTION. Landlord and Landlord's agents and representatives
        shall have the right to enter and inspect the Premises at any reasonable
        time during business hours upon reasonable notice except in the event of
        an emergency when Landlord or Landlord's agents may access the Premises
        at any time and without notice for the purpose of ascertaining the
        condition of the Premises or in order to make such repairs as may be
        required or permitted to be made by Landlord under the terms of this
        Lease or in order to show the Premises to any prospective purchaser or
        lender. During the period that is six (6) months prior to the end of the
        term hereof, Landlord and Landlord's agents and representatives shall
        have the right to enter the Premises at any reasonable time during
        business hours upon reasonable notice for the purpose of showing the
        Premises to any prospective tenant and shall have the right to erect on
        the Premises a suitable sign indicating the Premises are available.
        Tenant shall schedule with Landlord at least sixty (60) days prior to
        vacating the Premises a time mutually agreeable to the parties hereto
        for a joint inspection of the Premises prior to vacating. In the event
        of Tenant's failure to give notice or arrange such joint inspection,
        Landlord's inspection at or after Tenant's vacating the Premises shall
        be conclusively deemed correct for purposes of determining Tenant's
        responsibilities for repairs and restoration.

        8.      UTILITIES. Landlord agrees to provide at its cost, all utility
        line connections into the Premises. Tenant shall pay all charges for all
        water, electrical, telephone, sewer, and other utilities or services
        used on or from the Premises, together with any taxes, penalties,
        surcharges or the like pertaining thereto, including, but not limited
        to, any costs for utilities used by Tenant at the Premises after normal
        business hours, 8:00 AM to 5:00 PM, Monday - Friday. Tenant shall also
        pay for any utility maintenance charges and shall furnish all
        replacement electric light bulbs and replacement tubes required for the
        Premises. If any such services are not separately metered to Tenant,
        Tenant shall pay a reasonable proportion as determined by Landlord of
        all charges jointly metered with other


                                       8


<PAGE>   12
        tenants of the Building. Landlord shall in no event be liable for any
        interruption or failure of utility services on the Premises, unless
        caused by the negligence of Landlord in which event Landlord shall use
        reasonable efforts to effect the reconnection of such services.

        9.      ASSIGNMENT AND SUBLETTING. Tenant shall not sublet the Premises
        in whole or in part or sell, assign, lien, encumber, or in any manner
        transfer this Lease or assign or delegate the management or permit the
        use or occupancy of the Premises or any part thereof by anyone other
        than Tenant without the prior written consent of Landlord, which consent
        shall not be unreasonably withheld. Landlord and Tenant acknowledge and
        agree that the foregoing provisions have been freely negotiated by the
        parties hereto and that Landlord would not have entered into this Lease
        without Tenant's consent to the terms of this Paragraph 9.

                No assignment, transfer, mortgage, sublease or other
        encumbrance, whether or not approved, and no indulgence granted by
        Landlord to any assignee or subtenant, shall in any way impair the
        continuing primary liability (which after an assignment shall be joint
        and several with the assignee) of Tenant hereunder, and no approval in a
        particular instance shall be deemed to be a waiver of the obligation to
        obtain Landlord's approval in any other case. If for any approved
        assignment or sublease Tenant receives rent or other consideration,
        either initially or over the term of the assignment or sublease, in
        excess of the base rent hereunder, or in case of a sublease of part of
        the Premises, in excess of the portion of such rent fairly allocable to
        such part, after appropriate adjustments to assure that all other
        payments called for hereunder are appropriately taken into account,
        Tenant shall pay to Landlord as additional rent one-half of the excess
        of each such payment of rent or other consideration received by Tenant
        promptly after its receipt.

                Anything contained in the foregoing provisions of this section
        to the contrary notwithstanding, neither Tenant nor any other person
        having an interest in the possession, use occupancy or utilization of
        the Premises shall enter into any lease, sublease, license, concession
        or other agreement for use, occupancy or utilization of space in the
        Premises which provides for rental or other payment for such use,
        occupancy or utilization base, in whole or in part, on the net income or
        profits derived by any person from the Premises leased, used, occupied,
        or utilized (other than an amount based on a fixed percentage or
        percentages of receipts or sales), and any such purported lease,
        sublease, license, concession or other agreement shall be absolutely
        void and ineffective as a conveyance of any right or interest in the
        possession, use, occupancy or utilization of any part of the Premises.

        10.     FIRE AND CASUALTY DAMAGE.

        A.      Landlord agrees to maintain standard fire and extended coverage
        insurance covering the Building in an amount not less than 80% (or such
        greater percentage as may be necessary to comply with the provisions of
        any co-insurance clauses of the policy) of the "replacement cost"
        thereof as such term is defined in the Replacement Cost Endorsement to
        be attached thereto, insuring against special causes of loss, including,
        the perils of fire, and lightning, such coverages and endorsements to be
        as defined, provided and limited in the standard bureau forms prescribed
        by the insurance regulatory authority for the State of North Carolina.
        Subject to the provisions of subparagraphs 10(C), 10(D) and 10(E) below,
        such insurance shall be for the sole benefit of Landlord and under its
        sole control.

        B.      If the Premises should be damaged or destroyed by any peril
        covered by the insurance to be provided by Landlord under subparagraph
        10(A) above, Tenant shall give immediate written notice thereof to
        Landlord.

        C.      If the Premises should be totally destroyed by any peril covered
        by the insurance to be provided by Landlord under subparagraph 10(A)
        above, or if they should be so damaged thereby that rebuilding or
        repairs cannot in Landlord's reasonable estimation be completed within
        one hundred and eighty (180) days after the date upon which Landlord is
        notified by Tenant of such damage, this Lease shall terminate and the
        rent shall be


                                       9


<PAGE>   13
         abated during the unexpired portion of this Lease, effective upon the
         date of the occurrence of such damage.

        D.      If the Premises should be damaged by any peril covered by the
        insurance to be provided by Landlord under subparagraph 10(A) above, but
        only to such extent that rebuilding or repairs can, in Landlord's
        reasonable estimation, be completed within one hundred and eighty (180)
        days after the date upon which Landlord is notified by Tenant of such
        damage, this Lease shall not terminate, and Landlord shall, at its sole
        cost and expense, thereupon proceed with reasonable diligence to rebuild
        and repair the Premises to substantially the condition in which they
        existed prior to such damage, except that Landlord shall not be required
        to rebuild, repair or replace any part of the partitions, fixtures,
        additions and other improvements which may have been placed in, on or
        about the Premises by Tenant. If the Premises are untenantable in whole
        or in part following such damage, the rent payable hereunder during the
        period in which they are untenantable shall be reduced to such extent as
        may be fair and reasonable under all of the circumstances.

        E.      Notwithstanding anything herein to the contrary, in the event
        the holder (the "Holder") of any indebtedness secured by a mortgage or
        deed of trust covering the Premises requires that the insurance proceeds
        be applied to such indebtedness, then Landlord shall have the right to
        terminate this Lease by delivering written notice of termination to
        Tenant within fifteen (15) days after such requirement is made by any
        such holder, whereupon all rights and obligations hereunder thereafter
        accruing shall cease and terminate; provided, however, upon its receipt
        of notice from the Holder that insurance proceeds shall be applied
        toward the indebtedness, Landlord shall act reasonably to seek to obtain
        sufficient financing to repair and restore the Premises at an interest
        rate, under terms and conditions, and with a lender all as approved by
        Landlord, in its sole discretion.

        F.      Each of Landlord and Tenant hereby releases the other from any
        loss or damage to property caused by fire or any other perils insured
        through or under either by way of subrogation or otherwise for any loss
        or damage to property caused by fire or any other perils insured in
        policies of insurance covering such property, even if such loss or
        damage shall have been caused by the fault or negligence of the other
        party, or anyone for whom such party may be responsible; provided,
        however, that this release shall be applicable and in force and effect
        only with respect to the loss or damage occurring during such times as
        the releasor's policies shall contain a clause of endorsement to the
        effect that any such release shall not adversely affect or impair said
        policies or prejudice the right of the releasor to recover thereunder
        and then only to the extent of the insurance proceeds payable under such
        policies. Each of Landlord and Tenant agrees that it will request its
        insurance carriers to include in its policies such a clause or
        endorsement. If extra cost shall be charged therefor, each party shall
        advise the other thereof and of the amount of the extra cost, and the
        other party, at its election, may pay the same, but shall not be
        obligated to do so.

        11. LIABILITY. Landlord shall not be liable to Tenant or Tenant's
employees, agents, patrons or visitors, or to any other person whomsoever, for
any injury to person or damage to property on or about the Premises to the
extent resulting from and/or caused by the negligence or misconduct of Tenant,
its agents, employees, patrons or visitors, or of any other person entering upon
the Premises. Tenant hereby covenants and agrees that it will at all times
indemnify, defend and hold safe and harmless Landlord (including, without
limitation, its trustees and beneficiaries if Landlord is a trust), and
Landlord's agents, employees, patrons and visitors from any loss, liability,
claims, suits, costs, expenses, including without limitation attorney's fees and
damages, arising out of any such damage or injury, excluding only injury to
persons or damage to property to the extent such injury or damage is caused by
the negligence, willful misconduct, acts or omissions of Landlord or its agents
or employees, or the failure of Landlord to repair any part of the Premises
which Landlord is obligated to repair and maintain hereunder within a reasonable
time after the receipt of written notice from Tenant of needed repairs.


                                       10


<PAGE>   14
        Tenant shall not be liable to Landlord or Landlord's employees, agents,
patrons, or visitors, or to any other person whomsoever, for any injury to
person or damage to property on or about the Premises, to the extent resulting
from and/or caused by the negligence or misconduct of Landlord, its agents,
employees, patrons or visitors. Landlord hereby covenants and agrees that it
will at all times indemnify, defend and hold safe and harmless Tenant
(including, without limitation, its trustees and beneficiaries if Tenant is a
trust), and Tenant's agents, employees, patrons, and visitors from any loss,
liability, claims, suits, costs, expenses, including, without limitation
attorneys' fees and damages, arising out of any such damage or injury, excluding
only injury to persons or damage to property to the extent such injury or damage
is caused by the negligence, willful misconduct, acts or omissions of Tenant or
its agents or employees, or the failure of Tenant to repair any part of the
Premises which Tenant is obligated to repair and maintain hereunder within a
reasonable time after the receipt of written notice from Landlord of needed
repairs.

        Tenant shall procure and maintain throughout the term of this Lease a
policy or policies of insurance, at its sole cost and expense, insuring both
Landlord and Tenant against all claims, demands or actions arising out of or in
connection with: (i) the Premises; (ii) the condition of the Premises; (iii)
Tenant's operations in and maintenance and use of the Premises; and (iv)
Tenant's liability assumed under this Lease, in which the limits of commercial
general liability shall not be less than $5,000,000.00 with respect to each
occurrence, not less than $5,000,000 with respect to personal injury or death of
a single person, not less than $5,000,000 general aggregate, and not less than
$5,000,000 with respect to products completed operations aggregate.

        All such policies shall be procured by Tenant from responsible insurance
companies with at least an A rating from Best's. Certified copies of such
policies, together with receipt evidencing payments of premiums thereof, shall
be delivered to Landlord prior to the Commencement Date. Not less than fifteen
(15) days prior to the expiration date of any such policies, certified copies of
the renewals thereof (bearing notations evidencing the payment of renewal
premiums) shall be delivered to Landlord. Such policies shall further provide
that not less than thirty (30) days prior written notice shall be given to
Landlord before such policy may be canceled or changed to reduce insurance
provided thereby.

        12. CONDEMNATION.

        A.      If the whole or any substantial part of the Premises should be
        taken for any public or quasi-public use under governmental law,
        ordinance, or regulation, or by right of eminent domain, or by private
        purchase in lieu thereof, and the taking would prevent or materially
        interfere with the use of the Premises by Tenant for the purposes
        provided herein, this Lease shall terminate and the rent shall be abated
        during the unexpired portion of this Lease, effective when the physical
        taking of the Premises shall occur.

        B.      If part of the Premises shall be taken for any public or
        quasi-public use under any governmental law, ordinance or regulation, or
        by right of eminent domain, or by private purchase in lieu thereof, and
        this Lease is not terminated as provided in the subparagraph above, this
        Lease shall not terminate but the rent payable hereunder during the
        unexpired portion of this Lease shall be reduced to such extent as may
        be fair and reasonable under all of the circumstances.

        C.      In the event of any such taking or private purchase in lieu
        thereof, Landlord shall be entitled to receive and retain all awards as
        may be awarded in any condemnation proceedings other than those
        specifically awarded Tenant for a taking of Tenant's personal property,
        loss of business and moving expenses.

        13. HOLDING OVER. Tenant will, at the termination of this Lease by lapse
of time or otherwise, yield up immediate possession to Landlord. If Landlord
agrees in writing that Tenant may hold over after the expiration or termination
of this Lease, unless the parties hereto otherwise agree in writing on the terms
of such holding over, the hold over tenancy shall be subject to termination by
Landlord at any time upon not less than ten (10) days advance written notice, or
by Tenant at any time upon not less than thirty (30) days advance written
notice, and all of the other terms and provisions of this Lease shall be
applicable during that period, except that Tenant shall pay Landlord from time
to time upon demand, as rental for the period of any


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<PAGE>   15
hold over, an amount equal to one and one-half (1-1/2) the rent in effect on the
termination date, computed on a daily basis for each day of the hold over
period. No holding over by Tenant, whether with or without consent of Landlord,
shall operate to extend this Lease except as otherwise expressly provided. The
preceding provisions of this Paragraph 13 shall not be construed as Landlord's
consent for Tenant to hold over.

        14. QUIET ENJOYMENT. Landlord covenants that it now has, or will acquire
before Tenant takes possession of the Premises, good title to the Premises, free
and clear of all liens and encumbrances, excepting only the lien for current
taxes not yet due, deed of trust(s), or mortgage(s) of record, zoning ordinances
and other building and fire ordinances and governmental regulations relating to
the use of such property, and easements, restrictions and other conditions of
record. Landlord represents and warrants that it has full right and authority to
enter into this Lease and that Tenant, upon paying the rental herein set forth
and performing its other covenants and agreements herein set forth, shall
peaceably and quietly have, hold and enjoy the Premises for the term hereof
without hindrance or molestation from Landlord, subject to the terms and
provisions of this Lease.

        15. EVENTS OF DEFAULT. The following events shall be deemed to be events
of default by Tenant under this Lease:

(a)     Tenant shall fail to pay (i) any installment of the rent herein reserved
within five days after the due date thereof, or (ii) payment with respect to
taxes hereunder, or any other payment or reimbursement to Landlord required
herein, within ten (10) days after the due date thereof.

(b)     Tenant shall become insolvent, or shall make a transfer in fraud of
creditors, or shall make an assignment for the benefit of creditors.

(c)     Tenant shall file a petition under any section or chapter of the
Bankruptcy Reform Act, as amended or under any similar law or statute of the
United States or any state thereof; or Tenant shall be adjudged bankrupt or
insolvent in proceedings filed against Tenant thereunder.

(d)     A receiver or trustee shall be appointed for all or substantially all of
the assets of Tenant.

(e)     Tenant shall desert or vacate all or a portion of the Premises.

(f)     Tenant shall fail to comply with any term, provision or covenant of this
Lease (other than the subparagraphs (a), (b), (c), (d), and (e) of this
Paragraph 15), and shall not cure such failure within thirty (30) days after
written notice thereof to Tenant; provided, however, in the event Tenant is
proceeding with due diligence to effect a cure under this subparagraph (f) and
addition time is needed by Tenant to complete its cure, Landlord shall act
reasonably to grant such additional time.

        16. REMEDIES. Upon the occurrence of any event of default in Paragraph
15 hereof, after the expiration of any applicable grace or cure periods,
Landlord shall have the option to pursue any remedy at law or in equity,
including, but not limited to, one or more of the following remedies without any
notice or demand whatsoever:

        (a)     Terminate this Lease, in which event Tenant shall immediately
        surrender the Premises to Landlord, and if Tenant fails to do so,
        Landlord may, without prejudice to any other remedy which it may have
        for possession or arrearage in rent, enter upon and take possession of
        the Premises and expel and remove Tenant and any other person who may be
        occupying the Premises or any part thereof, with or without judicial
        approval, by any legal means necessary, secure the Premises against
        unauthorized entry; and Tenant agrees to pay to Landlord on demand the
        amount of all loss and damage which Landlord may suffer by reason of
        such termination, whether through inability to relet the Premises on
        satisfactory terms or otherwise.

        (b)     Enter upon and take possession of the Premises and expel or
        remove Tenant and any other person who may be occupying such Premises or
        any part thereof, with or without judicial approval, by any legal means
        necessary, receive the rent thereof; secure the Premises against
        unauthorized entry; store any property located on the Premises at the


                                       12


<PAGE>   16
        expense of the owner thereof and Tenant agrees to pay to Landlord on
        demand any deficiency that may arise by reason of such reletting. In the
        event Landlord is successful in reletting the Premises at a rental in
        excess of that agreed to be paid by Tenant pursuant to the terms of this
        Lease, Landlord and Tenant each mutually agree that Tenant shall not be
        entitled, under any circumstances, to such excess rental, and Tenant
        does hereby specifically waive any claim to such excess rental.

        (c)     Enter upon the Premises, with or without judicial approval, by
        any legal means necessary, secure the Premises against unauthorized
        entry and do whatever Tenant is obligated to do under the terms of this
        Lease; and Tenant agrees to reimburse Landlord on demand for any
        expenses which Landlord may incur in thus effecting compliance with
        Tenant's obligations under this Lease.

        (d)     Accelerate and demand the payment of all base rent and other
        charges due and payable hereunder over the term of this Lease.

        In the event Tenant fails to pay any installment of base rent or
additional rent hereunder within fifteen days of the due date of such
installment, Tenant shall pay to Landlord on demand a late charge in an amount
equal to one percent (1%) of such installment per month to help defray the
additional cost to Landlord for processing such late payment. The provision for
such late charge shall be in addition to all of Landlord's other rights and
remedies hereunder or at law and shall not be construed as liquidated damages or
as limiting Landlord's remedies in any manner. If, on account of any breach or
default by Tenant in Tenant's obligations under the terms and conditions of this
Lease, it shall become necessary or appropriate for Landlord to employ or
consult with an attorney concerning or to enforce or defend any of Landlord's
rights or remedies hereunder, Tenant agrees to pay any and all reasonable
attorneys' fees so incurred.

        Pursuit of any of the foregoing remedies shall not preclude pursuit of
any of the other remedies herein provided or any other remedies provided by law
or equity, nor shall pursuit of any remedy herein provided constitute a
forfeiture or waiver of any rent due to Landlord hereunder or of any damages
accruing to Landlord by reason of the violation of any of the terms, provisions
and covenants herein contained. No act or thing done by Landlord or its agents
during the term hereby granted shall be deemed a termination of this Lease or an
acceptance of the surrender of the Premises, and no agreement to terminate this
Lease or accept a surrender of the Premises shall be valid unless in writing
signed by Landlord. No waiver by Landlord of any violation or breach of any of
the terms, provisions and covenants herein contained shall be deemed or
construed to constitute a waiver of any other violation or breach of any of the
terms, provisions and covenants herein contained. Landlord's acceptance of the
payment of rental or other payments hereunder after the occurrence of an event
of default shall not be construed as a waiver of such default, unless Landlord
so notifies Tenant in writing, and no receipt of money by Landlord from Tenant
after the termination of this Lease or after service of any notice or after the
commencement of any suit or after final judgment for possession of the Premises
shall reinstate, continue or extend the term of this Lease or affect any such
termination, notice, suit or judgment, unless Landlord so notifies Tenant in
writing. Forbearance by Landlord to enforce one or more of the remedies herein
provided upon an event of default shall not be deemed or construed to constitute
waiver of such default or of Landlord's right to enforce any such remedies with
respect to such default or any subsequent default.

        17.     LANDLORD'S LIEN. [INTENTIONALLY DELETED.]

        18.     MORTGAGES. Tenant accepts this Lease subject and subordinate to
any mortgage(s) and/or deed(s) of trust now or at any time hereafter
constituting a lien or charge upon the Premises or the improvements situated
thereon; provided, however, that if the mortgagee, trustee, or holder of any
such mortgage or deed of trust elects to have Tenant's interest in this Lease
superior to any such instrument, then by notice to Tenant from such mortgagee,
trustee or holder, this Lease shall be deemed superior to such lien, whether
this Lease was executed before or after said mortgage or deed of trust. Tenant
shall at any time hereafter on demand execute any instruments, releases or other
documents which may be required by any mortgagee or trustee for the purpose of
further subjecting and subordinating this Lease to the lien of any such mortgage
or deed to trust.


                                       13


<PAGE>   17
        19.     MECHANIC'S LIENS. Tenant shall have no authority, express or
implied, to create or place any lien or encumbrance of any kind or nature
whatsoever upon, or in any manner to bind, the interest of Landlord in the
Premises or to charge the rentals payable hereunder for any claim in favor of
any person dealing with Tenant, including those who may furnish materials or
perform labor for any construction or repairs, and each such claim shall affect
and each such lien shall attach to, if at all, only the leasehold interest
granted to Tenant by this instrument. Tenant covenants and agrees that it will
pay or cause to be paid all sums legally due and payable by it on account of any
labor performed or materials furnished in connection with any work performed on
the Premises on which any lien is or can be validly and legally asserted against
its leasehold interest in the Premises or the improvements thereon and that it
will save and hold Landlord harmless from any and all loss, cost or expense
based on or arising out of asserted claims or liens against the leasehold estate
or against the right, title and interest of Landlord in the Premises or under
the terms of this Lease.

        20.     NOTICES. Each provision of this instrument or of any applicable
governmental laws, ordinances, regulations, or other requirements with reference
to the sending, mailing, or delivery of any notice by Landlord to Tenant or with
reference to the sending, mailing, or delivery of any notice or the making of
any payment by Tenant to Landlord shall be deemed to be complied with when and
if the following steps are taken:

        (a) All rent and other payments required to be made by Tenant to
        Landlord hereunder shall be payable to Landlord at the address
        hereinbelow set forth or at such other address as Landlord may specify
        from time to time by written notice delivered in accordance herewith.
        Tenant's obligations to pay rent and any other amounts to Landlord under
        the terms and of this Lease shall not be deemed satisfied until such
        rent and other amounts have been actually received by Landlord.

        (b) Any notice or document required or permitted to be delivered
        hereunder shall be deemed to be delivered whether actually received or
        not when deposited in the United States Mail, postage prepaid, sent by
        federal express or other nationally recognized overnight courier,
        Certified or Registered Mail, return receipt requested, addressed to the
        parties hereto at the respective addresses set out below, or at other
        such addresses as they have heretofore specified by written notice
        delivered in accordance therewith.

        LANDLORD:

        Weeks Realty, L.P.
        1800 Perimeter Park Drive
        Suite 200
        Morrisville, North Carolina 27560
        Attention: Mr. Robert Cutlip

        With a copy to:

        Dave Lindner
        Weeks Corporation
        1800 Perimeter Park Drive
        Suite 200
        Morrisville, NC 27560

        and

        Cathy M. Rudisill, Esq.
        Smith Helms Mullis & Moore, L.L.P.
        2800 Two Hannover Square
        Raleigh, North Carolina 27601

        TENANT:

        Tekelec
        26580 West Agoura Road


                                       14


<PAGE>   18
         Calabasas, California 91302
         Attention: Gilles Godin

If and when included within the term "Landlord", as used in this instrument,
there is more than one person, firm or corporation, all shall jointly arrange
among themselves for their joint execution of such a notice specifying some
individual at some specific address for the receipt of notices and payments to
Landlord; if and when included within the term "Tenant", as used in this
instrument, there is more than one person, firm or corporation, all shall
jointly arrange among themselves for their joint execution of such a notice
specifying some individual at some specific address within the continental
United States for the receipt of notices to Tenant. All parties included within
the terms "Landlord" and "Tenant", respectively, shall be deemed to have
received notices in accordance with the provisions of this paragraph with the
same effect as if each had received such notice.

        21.     BROKER'S CLAUSE. Tenant warrants and represents to Landlord that
it has had no dealings with any real estate broker or agent in connection with
this Lease, and Tenant covenants to pay, hold harmless, and indemnify Landlord
from and against any and all costs, expenses, liabilities (including reasonable
attorneys' fees), causes of action, claims or suits in connection with any
compensation, commission, fee, or charges claimed by any other real estate
broker or agent with respect to this Lease or the negotiation thereof, arising
out of any act of Tenant. Landlord warrants and represents to Tenant that it has
had no dealings with any real estate broker or agent in connection with this
Lease, and Landlord covenants to pay, hold harmless, and indemnify Tenant from
and against any and all costs, expenses, liabilities (including reasonable
attorneys' fees), causes of action, claims or suits in connection with any
compensation, commission, fee, or charges claimed by any other real estate
broker or agent with respect to this Lease or the negotiation thereof, arising
out of any act of Landlord.

        22.     LANDLORD'S LIABILITY. Notwithstanding anything to the contrary
contained in this Lease, Tenant agrees and understands that Tenant shall look
solely to the estate and property of Landlord in the Building for the
enforcement of a judgment (or other judicial decree) requiring the payment of
money by Landlord to Tenant by reason of default or breach of Landlord in
performance of its obligations under this Lease, it being intended that there
will be absolutely no personal liability on the part of Landlord, its successors
and assigns with respect to any of the terms, covenants, and conditions of this
Leases, and no other assets of Landlord or of Landlord's partners, if any, shall
be subject to levy, execution, attachment or any other legal process for the
enforcement or satisfaction of the remedies pursued by Tenant in the event of
such default or breach, this exculpation of liability to be absolute and without
exception whatsoever.

        23.     RULES AND REGULATIONS. Tenant shall fully comply with the Rules
and Regulations attached hereto as Exhibit D and made a part hereof and any and
all modifications thereof or amendments thereto with respect to which Landlord
notifies Tenant and which are applied on a non-discriminatory basis to all
tenants in the building in which the Premises are located.

        24.     HAZARDOUS MATERIALS.

        (a) Tenant agrees that it will not release, discharge, place, hold, or
        dispose of any Hazardous Material (as hereinafter defined) on, under or
        at the Premises, in the Building, or on the Land, and that it will not
        use the Premises, the Building, the Land, or any other portion thereof
        as a treatment, storage, or disposal (whether permanent or temporary)
        site for any Hazardous Material. Tenant further agrees that it will not
        cause or allow any asbestos to be incorporated into any improvements or
        alterations which it makes or causes to be made to the Premises, or the
        Building.

        (b) Tenant hereby agrees to and does indemnify, defend and hold harmless
        Landlord from and against any and all losses, liabilities, damages,
        injuries, costs, expenses and claims of any and every kind whatsoever
        (including without limitation, court costs and attorneys' fees) which at
        any time or from time to time may be paid, incurred or suffered by, or
        asserted against Landlord for, with respect to, or as a direct or
        indirect result of (i) any breach by Tenant of the provisions of this
        Paragraph, or (ii) to the extent caused or


                                       15


<PAGE>   19
        allowed by Tenant or any agent, employee, invitee, or licensee of
        Tenant, the presence on or under, or the escape, seepage, leakage,
        spillage, discharge, emission, or release from, onto, or into the
        Premises, the Building, the Land, the atmosphere, or any watercourse,
        body of water, or groundwater, of any Hazardous Material (including,
        without limitation, any losses, liabilities, damages, injuries, costs,
        expenses or claims asserted or arising under the Comprehensive
        Environmental Response, Compensation and Liability Act, any so-called
        "Superfund" or "Superlien" law, or any other Federal, state, local or
        other statute, law, ordinance, code, rule, regulation, order or decree
        regulating, relating to or imposing liability or standards of conduct
        concerning any Hazardous Material); and the provisions of and
        undertakings and indemnification set forth in this paragraph shall
        survive the termination or expiration of this Lease, for any reason, and
        shall continue to be the liability, obligation and indemnification of
        Tenant, binding upon Tenant forever. The provisions of the preceding
        sentence shall govern and control over any inconsistent provision of
        this Lease.

        (c) For purposes of this Lease, "Hazardous Material" means and includes
        any hazardous or toxic substance, pollutant, contaminant, gas, or
        petroleum product defined as such in (or for purposes of) the
        Comprehensive Environmental Response, Compensation, and Liability Act,
        as amended, any so-called "Superfund" or "Superlien", law, the Toxic
        Substances Control Act, as amended, or any other Federal, state or local
        statute, law, ordinance, code, rule, regulation, order or decree
        regulating, relating to, or imposing liability or standards of conduct
        concerning, any hazardous, toxic or dangerous waste, substance or
        material, as now or at any time hereafter in effect, or any other
        hazardous, toxic or dangerous, waste, substance or material, gas or
        petroleum product.

        (d) Notwithstanding the foregoing, Tenant shall have the right to handle
        Hazardous Materials in the normal course of its business, provided,
        however, Tenant shall conduct all such activities in accordance with all
        applicable laws and regulations.

        25.     [INTENTIONALLY DELETED.]

        26.     COVENANT OF TENANT. If Landlord encounters difficulties in
        negotiating construction or permanent financing for the Premises, and
        after using its best efforts is unable to resolve those difficulties
        without obtaining minor modifications to this Lease, Tenant will act in
        good faith to work with Landlord in Landlord's efforts, but this
        agreement on the part of Tenant will not require Tenant to make any
        changes that in Tenant's reasonable judgment alter the term hereof, or
        adversely affect any substantive right or interest of Tenant, whether
        legal or economic.

        27.     MISCELLANEOUS.

        A.      Words of any gender used in this Lease shall be held and
        construed to include any other gender, and words in the singular number
        shall be held to include the plural, unless the context otherwise
        requires.

        B.      The terms, provisions and covenants and conditions contained in
        this Lease shall apply to, inure to the benefit of, and be binding upon
        the parties hereto and upon their respective heirs, legal
        representatives, successors and permitted assigns, except as otherwise
        herein expressly provided. Landlord shall have the right to assign any
        of its rights and obligations under this Lease. Each party agrees to
        furnish to the other, promptly upon demand, a resolution, or other
        appropriate documentation evidencing the due authorization of such party
        to enter into this Lease.

        C.      The captions inserted in this Lease are for convenience only and
        in no way define, limit or otherwise describe the scope or intent of
        this Lease, or any provision hereof, or in any way affect the
        interpretation of this Lease.

        D.      Tenant agrees from time to time, within ten (10) days after
        request of Landlord, to deliver to Landlord, or Landlord's designee, an
        estoppel certificate stating that this Lease is in full force and
        effect, the date to which rent has been paid, the unexpired term of this
        Lease and such other matters pertaining to this Lease as may be
        reasonably requested by Landlord. It is understood and agreed that
        Tenant's obligation to furnish such estoppel


                                       16


<PAGE>   20
        certificates in a timely fashion is a material inducement for Landlord's
        execution of this Lease.

        E.      This Lease may not be altered, changed or amended except by an
        instrument in writing signed by both parties hereto.

        F.      All obligations of Tenant and Landlord hereunder not fully
        performed as of the expiration or earlier termination of the term of
        this Lease shall survive the expiration or earlier termination of the
        term hereof, including, without limitation, all payment obligations
        concerning the condition of the Premises. Upon the expiration or earlier
        termination of the term hereof, and prior to Tenant's vacating the
        Premises, Tenant shall pay to Landlord any amount reasonably estimated
        by Landlord as necessary to put the Premises, including, without
        limitation, all heating and air conditioning systems and equipment
        therein, in good condition and repair. Tenant shall also, prior to
        vacating the Premises, pay to Landlord the amount, as estimated by
        Landlord, of Tenant's obligation hereunder for real estate taxes and
        insurance premiums for the year in which the Lease expires or terminates
        up to the Termination Date. All such amounts shall be used and held by
        Landlord for payment of such obligations of Tenant hereunder, with
        Tenant being liable for any additional costs therefor upon demand by
        Landlord, or with any excess to be returned to Tenant after all such
        obligations have been determined and satisfied, as the case may be. Any
        security deposit held by Landlord shall be credited against the amount
        payable by Tenant under this Paragraph 27(F).

        G.      In the event of a transfer by Landlord of its interest in the
        Premises, Landlord shall be released from all obligations and
        liabilities under the terms of this Lease subsequent to the date of such
        transfer. In the event a transferee shall agree to assume the
        obligations and liabilities of Landlord under the Lease prior to the
        date of the transfer, Landlord shall be released from all obligations
        and liabilities under the Lease.

        H.      If any clause or provision of this Lease is illegal, invalid or
        unenforceable under present or future laws effective during the term of
        this Lease, then and in that event, it is the intention of the parties
        hereto that the remainder of this Lease shall not be affected thereby,
        and it is also the intention of the parties to this Lease that in lieu
        of each clause or provision of this Lease that is illegal, invalid or
        unenforceable, there be added as a part of this Lease contract a clause
        or provision as similar in terms to such illegal, invalid or
        unenforceable clause or provision as may be possible and be legal, valid
        and enforceable.

        I.      [INTENTIONALLY DELETED.]

        J.      All references in this Lease to "the date hereof" or similar
        references shall be deemed to refer to the last date, in point of time,
        on which all parties hereto have executed this Lease.

        K.      Time is of the essence of this Lease.

        L.      Landlord shall not be in default in the performance of any of
        Landlord's obligations hereunder unless and until Landlord shall have
        failed to perform such duties or obligations within thirty (30) days (or
        such additional time as is reasonably required to correct any such
        default) after written notice by Tenant to Landlord, and to any
        mortgagee with a lien on the Land or the Building, properly specifying
        wherein Landlord has failed to perform any such duty or obligation.
        Neither party hereto shall have any liability to the other party hereto
        for any incidental, special, indirect, punitive, or consequential
        damages of a party hereto for any reason whatsoever.

        M.      In the event that Landlord shall default in the performance of
        Landlord's obligations hereunder, the holder of a mortgage or the
        beneficiary of a deed of trust which includes the Premises shall have
        the right, but not the obligation, to perform or comply with any
        covenants, agreements and provisions violated in connection with such
        default. Further, if such holder of beneficiary notifies Tenant that
        such holder or beneficiary has taken over Landlord's right under this
        Lease, Tenant shall not assert any right to deduct the cost of repairs
        or any monetary claims against Landlord theretofore accrued from rent


                                       17


<PAGE>   21
        thereafter due and payable, but shall look solely to Landlord and not
        such holder or beneficiary for satisfaction of such claim.

        N.      This Lease does not create the relationship of partner or joint
        venturer between Landlord and Tenant. This Lease shall not result in the
        creation of an estate for years in Tenant. Accordingly, Tenant shall
        have only an usufruct not subject to levy or sale. Tenant shall have no
        rights of assignment, subletting, sale or transfer beyond those set
        forth herein and hereby waives any such rights existing pursuant to the
        laws of the State of North Carolina or otherwise. No estate shall pass
        out of Landlord to Tenant hereunder, and Tenant shall not be entitled to
        any award of whatsoever nature based on this Lease and/or Tenant's right
        to occupy the Premises hereunder.

        O.      The laws of the State of North Carolina shall govern the
        interpretation, the validity, performance and enforcement of this Lease.

        P.      (i) If Tenant is a corporation, the undersigned officer of
        Tenant does hereby warrant and certify to Landlord that Tenant is a
        corporation in good standing and duly organized under the laws of the
        State of North Carolina, or if chartered in a state other than the State
        of North Carolina, is a corporation in good standing and duly organized
        under the laws of such state and is authorized to do business in the
        State of North Carolina. The undersigned officer of Tenant hereby
        further warrants and certifies to Landlord that such officer is
        authorized and empowered to bind the corporation to the terms of this
        Lease by such officer's signature hereto, (ii) If Tenant is a general or
        limited partnership, the undersigned general partner of Tenant does
        hereby warrant and certify to Landlord that Tenant is a general
        partnership or limited partnership, as the case may be, validly existing
        under the laws of the State of North Carolina, or if formed in a state
        other than the State of North Carolina, is a general partnership or
        limited partnership validly existing under the laws of such state and is
        authorized to do business in the State of North Carolina. The
        undersigned general partner of Tenant hereby further warrants and
        certifies to Landlord that such general partner is authorized and
        empowered to bind Tenant to the terms of this Lease by such general
        partner's signature hereto.

        Q.      This Lease shall be executed in duplicate, each of which shall
        be deemed an original and complete of itself and may be introduced into
        evidence or used for any purpose without the production of any other
        copy. If Tenant is a corporation, two authorized corporate officers must
        execute this Lease in their appropriate capacity for Tenant and affix
        the corporate seal.

        R.      The provisions contained in the Rider attached hereto, if any,
        are incorporated herein by reference and made a part of this Lease. In
        the event of a conflict between the printed portion of this Lease and
        the Rider, the provisions of the Rider shall govern and control.

        S.      Although the printed provisions of this Lease were drafted by
        Landlord, such fact shall not cause this Lease to be construed either
        for or against Landlord or Tenant.

        T.      This Lease may not be recorded. Upon the request and at the
        expense of Tenant, Landlord shall execute a memorandum of Lease suitable
        for recording which shall omit the financial terms herein but which
        shall identify the Premises and the term of this Lease, Upon the
        expiration of this Lease, a recorded memorandum of this Lease may be
        canceled of record by a document executed by Landlord, or its successor
        in interest for such purpose.

        U.      To the best of its knowledge, Landlord certifies that on or
        after January 1, 2000, all systems installed in the Building by or on
        behalf of Landlord to service the Premises, including, but not limited
        to, the heating, air conditioning, sprinkler, security, electrical,
        plumbing, and other systems installed by Landlord in the Building will
        record, store, process, and present calendar dates in the same manner
        and with the same functionality as such Systems record, store, process,
        and present calendar dates falling on or before December 31, 1999.


                                       18


<PAGE>   22
        V.      Tenant shall provide to Landlord within ninety days of the close
        of its fiscal year, and thereafter upon reasonable request of Landlord,
        financial statements of Tenant certified by the chief financial officer
        of Tenant, and Tenant shall act to ensure that any guarantor hereof
        provides Landlord with copies of its financial statements within ninety
        days of the close of its fiscal year.

        W.      No remedy conferred herein is intended to be exclusive of any
        other remedy and each and every remedy shall be cumulative and shall be
        in addition to every other remedy given hereunder or thereunder or now
        or hereafter existing at law or in equity or by statute or otherwise.

        X.      Parking shall be available for tenants of the Building at the
        rate of five parking spaces for each 1000 rentable square feet of the
        Building.

[THE REMAINDER OF THIS PAGE WAS INTENTIONALLY LEFT BLANK.]


                                       19


<PAGE>   23
        IN WITNESS WHEREOF, the parties hereto have executed this Lease under
seal as of the day and year first above written.

                        LANDLORD:

                        WEEKS REALTY, L.P. (SEAL), a 
                        Georgia limited partnership 
                        authorized to do business in the
                        State of North Carolina as
                        WEEKS REALTY LIMITED PARTNERSHIP

                        BY: WEEKS GP HOLDINGS, INC.,
                        Georgia corporation, its sole general partner

                        By:   /s/ ROBERT G. CUTLIP
                             -------------------------------
                             Robert G. Cutlip,
                             Senior Vice President



                        TENANT:

                        TEKELEC, a California
                        corporation

                        By:  /s/ GILLES C. GODIN      By:  /s/ MIKE MARGOLIS
                             -----------------------       ---------------------
                        Print Name: Gilles C. Godin   Print Name: Mike Margolis
                                  ------------------            ----------------
                        Vice President & CFO          President & CEO


Witness/Attest:


/s/ KAROLYN FLESHER
- -------------------------------
Print Name: Karolyn Flesher
           --------------------           
Title: Assistant Secretary                
      -------------------------           

[CORPORATE SEAL]


                                       20



<PAGE>   24

                                   EXHIBIT A

                               LEGAL DESCRIPTION

        METES AND BOUNDS DESCRIPTION FOR PHASE 1 LOT 8 PARAMOUNT CENTER

That 15.86 acre tract of land lying in the Cedar Fork Township, Morrisville, 
Wake Country, North Carolina, and being a portion of the tract found in Deed 
Book (D.B.) 5605 Page (Pg.) 216-218 in the Register of Deeds office of said 
Wake County, and being bounded on the North by Lot 7 Paramount Center; on the 
East by J.A. Ferrell (D.B.) 1437 (Pg.) 780 now or formerly and Jesse Marcom 
(D.B.) 877 (Pg.) 32 now or formerly; on the South by Lot 9 Paramount Center and 
Proposed Paramount Parkway (100' Public right-of-way); and on the West by Phase 
II Paramount Center Lot 8 and Proposed Road "A" (100' Public right-of-way); and 
being more particularly described as follows:

Beginning at a new iron pipe set in the Western line of said J.A. Ferrell and
also being the Northeast corner of said Lot 8, said iron being South 03 degrees
05 minutes 47 seconds East 884.33 feet from an existing iron pipe in the said
Western line of J.A. Ferrell; thence along said J.A. Ferrell's Western line,
South 03 degrees 05 minutes 47 seconds East 399.39 feet to an existing iron
pipe, a common corner with said Jesse Marcom; thence along the said Jesse
Marcom's Western line, South 00 degrees 25 minutes 05 seconds East 286.92 feet
to a point, the Northeast corner of said Lot 9, thence leaving said Jesse
Marcom's Western line along a common lot line with said Lot 9, South 88 degrees
41 minutes 07 seconds West 442.57 feet to a point; thence with said common Lot 9
line, South 51 degrees 26 minutes 44 seconds West 399.66 feet to a point in the
Northern right-of-way line of said proposed Paramount Parkway; thence along the
said Northern right-of-way line of Paramount Parkway Northwesterly 248.90 feet
along a nontangential curve to the left, central angle 14 degrees 19 minutes 57
seconds, radius 995.00 feet to a point; thence leaving said Northern
right-of-way line along a Phase line for Phases I and II, North 19 degrees 40
minutes 36 seconds East 114.00 feet to a point; thence North 00 degrees 00
minutes 00 seconds East 56.74 feet to a point; thence South 90 degrees 00
minutes 00 seconds East 195.69 feet to a point; thence Northeasterly 38.27 feet
along a tangential curve to the left, central angle 90 degrees 00 minutes 00
seconds, radius 25.00 feet to a point; thence North 00 degrees 00 minutes 00
seconds East 322.48 feet to a point; thence South 90 degrees 00 minutes 00
seconds West 36.51 feet to a point; thence North 00 degrees 00 minutes 00
seconds East 250.34 feet to a point; thence South 90 degrees 00 minutes 00
seconds West 141.35 feet to a point; thence North 48 degrees 14 minutes 55
seconds West 61.24 feet to a point in the Eastern right-of-way line of said
proposed Road "A"; thence along the said Eastern right-of-way line of Road "A:,
North 41 degrees 45 minutes 05 seconds East 385.98 feet to a new iron pipe set,
the Northwest corner of said Lot 8 and common corner with said Lot 7; thence
leaving said Eastern right-of-way line with the common line of said Lot 7, South
57 degrees 37 minutes 22 seconds East 369.41 feet to a new iron pipe set; thence
with the common line of said Lot 7, South 80 degrees minutes 30 seconds 357.55
feet to the Point of Beginning.

Said parcel contains 15.86 acres and is the same as shown in a Preliminary Site 
Plans entitled "PARAMOUNT CENTER - LOT 8" prepared by DSAtlantic Corporation 
and dated May 20, 1998 with a last revision date of August 15, 1998.


<PAGE>   25

                                                                       EXHIBIT B
                                                                                
                                                                      FLOOR PLAN



TEKELEC BUILD TO SUIT

PARAMOUNT CENTER
MORRISVILLE, NORTH CAROLINA
FIRST FLOOR






                                  [FLOOR PLAN]
<PAGE>   26

                                                                     EXHIBIT B-1
                                                                                
                                                              FLOOR PLAN (cont.)



TEKELEC BUILD TO SUIT

PARAMOUNT CENTER
MORRISVILLE, NORTH CAROLINA
SECOND FLOOR






                                  [FLOOR PLAN]
<PAGE>   27
                                   EXHIBIT C

                            PLANS AND SPECIFICATIONS

             [TO BE ATTACHED UPON APPROVAL BY LANDLORD AND TENANT]
<PAGE>   28
                                  EXHIBIT C-1

                                    SCHEDULE
<PAGE>   29
<TABLE>
<S>  <C>    <C>                                                     <C>                   <C>
                                      TEKELEC INTERIOR DESIGN PROGRAM
- ---------------------------------------------------------------------------------------------------------------

10          Task Name                                               Duration              Start
- ---------------------------------------------------------------------------------------------------------------
 1          TEKELEC PRELIMINARY SCHEMATIC SUBMITTAL                 0 days                10/16/98

- ---------------------------------------------------------------------------------------------------------------
 2          TEKELEC WEEKS PRELIMINARY SCHEMATIC REVIEW              5 days                10/19/98

- ---------------------------------------------------------------------------------------------------------------
 3          REVISE PRELIMINARY SCHEMATIC PER COMMENTS               3 days                10/26/98

- ---------------------------------------------------------------------------------------------------------------
 4          FINAL APPROVED PRELIMINARY SCHEMATIC ISSUED             0 days                10/28/98

- ---------------------------------------------------------------------------------------------------------------
 5

- ---------------------------------------------------------------------------------------------------------------
 6          WEEKS SUBMITS CORE FINISHES FOR APPROVAL                0 days                10/28/98

- ---------------------------------------------------------------------------------------------------------------
 7          TEKELEC REVIEWS SELECTIONS                              5 days                10/29/98

- ---------------------------------------------------------------------------------------------------------------
 8          WEEKS REVISES CORE FINISHES, IF NECESSARY               3 days                11/5/98

- ---------------------------------------------------------------------------------------------------------------
 9          WEEKS PRESENTS FINAL CORE FINISHES                      1 day                 11/10/98

- ---------------------------------------------------------------------------------------------------------------
10

- ---------------------------------------------------------------------------------------------------------------
11          TEKELEC PRODUCES "FOR PRICING" DRAWINGS                 10 days               10/29/98

- ---------------------------------------------------------------------------------------------------------------
12          TEKELEC SUBMITS "FOR PRICING" DRAWINGS                  0 days                11/11/98

- ---------------------------------------------------------------------------------------------------------------
13          WEEKS REVIEWS PRICING DOCUMENT FOR CLARITY              3 days                11/12/98

- ---------------------------------------------------------------------------------------------------------------
14          TEKELEC REVISES DOCUMENTS PER COMMENTS                  2 days                11/17/98

===============================================================================================================
Schedule Date: 6/3/97           Task [             ]      Critical Task [                ]         Milestone  *
Price Date: 9/1/98
tekelec.mpp
- ---------------------------------------------------------------------------------------------------------------
                                                     Page 1
- ---------------------------------------------------------------------------------------------------------------


- ---------------------------------------------------------------------------------------------------------------------------
   Jul '98    Aug '98      Sep '98    Oct '98    Nov '98      Dec '98    Jan '99       Feb '99    Mar '99    Apr '99    May
28 5 12 19 26 2 9 16 23 30 6 13 20 27 4 11 18 25 1 8 15 22 29 6 13 20 27 3 10 17 24 31 7 14 21 28 7 14 21 28 4 11 18 25 2 9
- ---------------------------------------------------------------------------------------------------------------------------

                                      10/16 * TEKELEC PRELIMINARY SCHEMATIC SUBMITTAL
- ---------------------------------------------------------------------------------------------------------------------------
                           TEKELEC/ WEEKS PRELIMINARY SCHEMATIC REVIEW
                                           10/19 [ ] 10/23
- ---------------------------------------------------------------------------------------------------------------------------
                              REVISE PRELIMINARY SCHEMATIC PER COMMENTS
                                          10/26 [ ] 10/28

                                            10/28 * FINAL APPROVED PRELIMINARY SCHEMATIC ISSUED
- ---------------------------------------------------------------------------------------------------------------------------


- ---------------------------------------------------------------------------------------------------------------------------

                                            10/28 * WEEKS SUBMITS CORE FINISHES FOR APPROVAL
- ---------------------------------------------------------------------------------------------------------------------------
                                      TEKELEC REVIEWS SELECTIONS
                                             10/29 [ ] 11/4
- ---------------------------------------------------------------------------------------------------------------------------
                                 WEEKS REVISES CORE FINISHES, IF NECESSARY
                                                11/5 [ ] 11/9
                                    WEEKS PRESENTS FINAL CORE FINISHES
                                                11/10 [ ] 11/10
- ---------------------------------------------------------------------------------------------------------------------------


- ---------------------------------------------------------------------------------------------------------------------------
                                TEKELEC PRODUCES "FOR PRICING" DRAWINGS
                                             10/29 [   ] 11/11


                                                   11/11 * TEKELEC SUBMITS "FOR PRICING" DRAWINGS
- ---------------------------------------------------------------------------------------------------------------------------
                                     WEEKS REVIEWS PRICING DOCUMENT FOR CLARITY
                                                    11/12 [ ] 11/16
                                         TEKELEC REVISES DOCUMENTS PER COMMENTS
                                                     11/17 [ ] 11/18
===========================================================================================================================
       Summary [                ]                                                                  TENANT APPROVED
                                                                                                   BY /s/ [Sig Illegible]
                                                                                                   DATE 9/2/98
- ---------------------------------------------------------------------------------------------------------------------------
                                                         Page 1
- ---------------------------------------------------------------------------------------------------------------------------
                                                                                                                Page 1 of 3
</TABLE>
<PAGE>   30
                        TEKELEC INTERIOR DESIGN PROGRAM

<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------------------
                                                               Jul '98       Aug '98      Sep '98     Oct '98    Nov '98   Dec '98
                                                            ------------------------------------------------------------------------
ID  i   TASK NAME                          DURATION  START  28 5 12 19 26 2|9 16;23 30 6 13|20|27 4 11 18 25 1 8 15|22 29 6 13 20 27
- ------------------------------------------------------------------------------------------------------------------------------------
<S> <C> <C>                                 <C>       <C>   <C>
15      WEEKS PRICING OF DOCUMENTS         15 DAYS  11/19/98
- -------------------------------------------------------------
16      PRICING PRESENTED TO TEKELEC        0 days   12/9/98
- -------------------------------------------------------------
17
- -------------------------------------------------------------
18
- -------------------------------------------------------------
19      TEKELEC REVIEW OF PRICING DATA      5 days 12/10/98
- -------------------------------------------------------------
20      WEEKS REPRICE PER TEKELEC COMMENTS  5 days 12/17/98
- -------------------------------------------------------------
21      TEKELEC SIGN-OFF OF FINAL "WORK"
        COST                                0 days 12/23/98
- -------------------------------------------------------------
22      FINAL "FOR CONSTRUCTION" DRAWING
        PRODUCED                           17 days 12/24/98
- -------------------------------------------------------------
23
- -------------------------------------------------------------
24      INTERIOR BUILDING PERMIT           23 days  1/18/99
- -------------------------------------------------------------
25        INITIAL SUBMISSION TO CITY        0 days  1/18/99
- -------------------------------------------------------------
26        CITY REVIEW AND COMMENT          15 days  1/19/99
- -------------------------------------------------------------
27        RECEIVE COMMENTS                  0 days   2/8/99
- -------------------------------------------------------------
28        ADDRESS COMMENTS                  3 days  2/29/99
- ------------------------------------------------------------------------------------------------------------------------------------
Schedule Date: 6/3/97        Task [ ]        Critical        Task [ ]        Milestone [ ]        Summary [ ]
Print Date: 9/1/98
Tekelec.mpp
- ------------------------------------------------------------------------------------------------------------------------------------
                                                        Page 2
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------------------
                                                               Jan '99        Feb '99      Mar '99     Apr '99      May '99
                                                            ------------------------------------------------------------------------
ID  i   TASK NAME                          DURATION  START   3  10  17  24  31  7  14  21  28  7  14  21  28  4  11  18  25  2  9
- ------------------------------------------------------------------------------------------------------------------------------------
<S> <C> <C>                                 <C>       <C>   <C>
15      WEEKS PRICING OF DOCUMENTS         15 DAYS  11/19/98          WEEKS PRICING OF DOCUMENTS
- -------------------------------------------------------------         11/19 [ ] 12/9
16      PRICING PRESENTED TO TEKELEC        0 days   12/9/98
- -------------------------------------------------------------          12/9 [ ] PRICING PRESENTED TO TEKELEC
17
- -------------------------------------------------------------
18
- -------------------------------------------------------------
19      TEKELEC REVIEW OF PRICING DATA      5 days 12/10/98           TEKELEC REVIEW OF PRICING DATA
- -------------------------------------------------------------         12/10 [ ] 12/16   
20      WEEKS REPRICE PER TEKELEC COMMENTS  5 days 12/17/98
- -------------------------------------------------------------         WEEKS REPRICE PER TEKELEC COMMENTS 
21      TEKELEC SIGN-OFF OF FINAL "WORK"                              12/17 [ ] 12/23
        COST                                0 days 12/23/98           12/23 [ ] TEKELEC SIGN-OFF OF FINAL "WORK" COST
- -------------------------------------------------------------         FINAL "FOR CONSTRUCTION" DRAWING PRODUCED
22      FINAL "FOR CONSTRUCTION" DRAWING                              12/24 [ ] 1/18
        PRODUCED                           17 days 12/24/98           INTERIOR BUILDING PERMIT
- -------------------------------------------------------------         1/18 [ ] INITIAL SUBMISSION TO CITY
23                                                                    CITY REVIEW AND COMMENT
- ------------------------------------------------------------          1/19 [ ] 2/8
24      INTERIOR BUILDING PERMIT           23 days  1/18/99           
- -------------------------------------------------------------         2/8 [ ] RECEIVE COMMENTS
25        INITIAL SUBMISSION TO CITY        0 days  1/18/99           ADDRESS COMMENTS
- -------------------------------------------------------------         2/9 [ ] 2/11
26        CITY REVIEW AND COMMENT          15 days  1/19/99
- -------------------------------------------------------------
27        RECEIVE COMMENTS                  0 days   2/8/99
- -------------------------------------------------------------
28        ADDRESS COMMENTS                  3 days  2/29/99
- ------------------------------------------------------------------------------------------------------------------------------------
Schedule Date: 6/3/97        Task [ ]        Critical        Task [ ]        Milestone [ ]        Summary [ ]
Print Date: 9/1/98
Tekelec.mpp
- ------------------------------------------------------------------------------------------------------------------------------------
                                                        Page 2
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
<PAGE>   31
                        TEKELEC INTERIOR DESIGN PROGRAM

<TABLE>

<S>    <C>    <C>                 <C>           <C> 
- --------------------------------------------------------------
                                            
1D      i      Task Name          Duration        Start  
- --------------------------------------------------------------
29            CITY FINAL REVIEW   5 days          21/12/99
- --------------------------------------------------------------
30            RECEIVE PERMIT      0 days          2/18/99
- --------------------------------------------------------------
</TABLE>

<TABLE>
<S>            <C>         <C>        <C>          <C>         <C>        <C>          <C>             <C>        <C>       <C>   
- ----------------------------------------------------------------------------------------------------------------------------------
Jul '98        Aug '98     Sep '98    Oct '98       Nov '98    Dec '98    Jan '99       Feb '99         Mar '99    Apr '99   May?
- ----------------------------------------------------------------------------------------------------------------------------------
28 5 12 19 25  2 9 16 23  30:6 13:20 27 4 11 18 25  1 8 15 22  29:6 13 20 27:3 10 17 24 31 7 14 21:26 7 14 21 28 4 11:18 25 2 9
- ----------------------------------------------------------------------------------------------------------------------------------
                                                                                CITY FINAL REVIEW
                                                                                 2/12 [ ]   2/18
                                        
          
                                                                                2/18  [ ]  RECEIVE PERMIT
- -----------------------------------------------------------------------------------------------------------------------------------








Schedule Date: 6/3/97              Task           Critical Task            Milestone [ ]            Summary ________________
Print Date: 9/1/98
Tekelec.mpp
- ----------------------------------------------------------------------------------------------------------------------------------
                                     Page 3
- ----------------------------------------------------------------------------------------------------------------------------------
</TABLE>


                                  Page 3 0f 3



<PAGE>   32
                                  EXHIBIT C-2

                                DESIGN CRITERIA

DESIGN CRITERIA:

     A,   CONCRETE SYSTEMS

          1.   FOUNDATIONS

               a.   Spread Footings

                    i.   Provide at column line intersections, sized by 
               registered structural engineer designs.

                    ii.  Reinforced as required.

               b.   Perimeter Strip Footings

                    i.   Provide for exterior dock wall, sized by registered 
               structural engineer design.

                    ii.  Reinforced as required.

          2.   SLAB-ON-GRADE

               a.   4" thick; 3,000 psi concrete with 8 mil. vapor barrier on 
               compacted earth.

               b.   Provide perimeter turndown for exterior walls at slab edge, 
               reinforced as required.

               c.   Include 1.5" thick by 3' wide rigid insulation underslab on 
               grade at exterior walls, per local energy codes.

               d.   Provide clear sealed floor finish on prepared surface.

          
          3.   ELEVATED SLAB

               a.   Provide 3,000 psi lightweight concrete on galvanized 
               composite metal deck, reinforced with 6x6 W2.1x2.1 welded wire 
               mesh.

     B.   MASONRY

          1.   BRICK VENEER

               a.   Modular brick veneer with 3/8" thick mortar joint.

               b.   Field brick material: Richtex, #760 Medium Gray Wirecut.

               c.   Accent brick material: Lee Brick, #608, Beauford.

               d.   Mortar: Natural gray.

          2.   MISCELLANEOUS

               a.   Two-part, screw-attached ties at exterior sheathing 
               construction.

               b.   Thru-wall flashing.
<PAGE>   33
          c.   Include weep wicks to conduct moisture out of walls as noted on 
          contract documents.

     C.   METALS

          1.   STRUCTURAL STEEL

               a.   Provide a free standing structural steel frame.

               b.   Floor to floor height: 14'.

          2.   MISCELLANEOUS METALS

               a.   Include five interior concrete filled metal pan steel 
               stairs.

               b.   Include brick shelf angle and kickers.

               c.   Include elevator pit ladders, sump angle frames and sills.

               d.   Include pipe bollards at loading dock.

          3.   ARCHITECTURAL METALS

               a.   Include steel picket handrail at second floor lobby.

     D.   CARPENTRY

          1.   ROUGH CARPENTRY

               a.   Include pressure-treated wood nailers for roofing system.

               b.   Include pressure-treated wood nailers for storefront system.

               c.   Include interior wood blocking at core areas.

          2.   MILLWORK

               a.   Include solid surface lavatories at core area restrooms.

     E.   MOISTURE PROTECTION

          1.   CAULKING

               a.   Include dymeric caulking of masonry control joints.

               b.   Include caulking of window wall and storefront systems.

               c.   Include caulking of hollow metal exterior door frames.

          2.   ROOF SYSTEMS

               a.   Type: single-ply, river-stone ballasted, 45 mil. E.P.D.M.
               membrane system on one (1) layer of 5/8" gypsum board, with a
               20-year warranty on materials and 10-year warranty on
               installation.

               b.   Insulation: R-14 rigid insulation.

               c.   Include 24-gauge, pre-finished Kynar 500 coping, flashing,
               downspouts and gutters.


                                                                               2
<PAGE>   34
     3.   FIREPROOFING

          a.   Include sprayed on fireproofing to provide 1 hour rating to the
          floor, columns and bracing.

     4.   SKYLIGHT STRUCTURE

          a.   Provide one pyramid skylight structure, with translucent
          fiberglass and glass panels.

F.   DOORS & WINDOWS

     1.   WOOD DOORS

          a.   Include 3' x 8'-8" custom-grade, solid core, rotary sliced
          natural birch wood doors in hollow metal frames.

          b.   Include rated doors with positive latch set and closers as
          required in rated wall assemblies.

          c.   Include doors for core area only. All other doors to be included
          in the Office Finish Allowance.

     2.   FINISH HARDWARE

          a.   Include finish hardware.

     3.   STOREFRONT

          a.   Include system consisting of 1" Ford Blue, insulated, reflective
          glass in a prefinished Kawneer frame.

          b.   Include aluminum Kawneer 1500 series curtainwall system at front
          entry.

          c.   Include medium stile glass entry doors, with manufacturer's
          standard hardware.

          d.   Finish of exposed aluminum surfaces to be clear anodized.

G.   FINISHES

     1.   DRYWALL CONSTRUCTION

          a.   Exterior wall: metal studs with gypsum board sheathing, 15 lb.
          felt, brick ties and flashing.

          b.   Partition wall: metal studs with gypsum board, attached to metal
          ceiling grid and supported to structure as required.

          c.   Elevator wall: metal studs with fire rated gypsum liner panel on
          one side and fire rated GWB on opposite side.

          d.   Stair walls: metal studs with fire rated GWB on each side.

          e.   Typical core walls: metal studs with gypsum board and sound batt
          insulation. Walls to be one-hour fire rated as required by code.

          f.   All other partitions and furring is included in the Office Finish
          Allowance.

     2.   ACOUSTICAL CONSTRUCTION


                                                                               3


<PAGE>   35
          a.   Core area ceilings: Provide USG 2'-0" x 2'-0" #707 Glacier
          acoustical ceiling furnished and fully installed.

          b.   Tenant ceilings: Provide 2'-0" x 4'-0" framed grid with Armstrong
          Cortega revealed #704 acoustical tile stocked on floor.

     3.   TILE

          a.   Provide 2" x 2" unglazed ceramic floor tile and base, in each
          toilet.

          b.   Well walls in toilets to receive 4-1/4" x 4-1/4" bright/matte
          wall tile and trim, to 5'-0" af.f.

          c.   Provide quarry tile at the entry lobby.

     4.   CARPET AND RESILIENT FLOORING

          a.   Provide an allowance of $20.00/SY for the furnishing and
          installation of carpet.

          b.   Carpet to be utilized in core areas.

          c.   Provide 12" x 12" x 1/8" VCT in the freight elevator lobbies.

          d.   Mechanical, electrical, phone and elevator equipment rooms to
          have an exposed concrete floor.

          e.   Provide 4" rubber cove base.

          f.   All areas outside of the core area are included in the Finish
          Allowance.

     5.   PAINTING AND WALLCOVERING

          a.   Provide flat latex paint for the interior of the stairwells,
          freight elevator lobby, mechanical room, electrical room, phone room
          and elevator equipment room.

          b.   Provide alkyd enamel painting of metal pan stairs and rails.

          c.   Provide fabric wallcovering in the lobby area.

          d.   Provide vinyl wallcovering in the restrooms.

          e.   All areas outside of core area are included in the Finish
          Allowance.

H.   SPECIALTIES

     1.   TOILET PARTITIONS

          a.   Provide baked enamel steel, floor mounted, overhead braced toilet
          partitions.

          b.   Provide baked enamel steel, wall hung, urinal screens.

     2.   TOILET ACCESSORIES

          a.   Provide accessories in men's toilets as follows:

               i.   Paper towel dispenser and waste receptacle - Bobrick 3944.

               ii.  Double-roll toilet tissue holder - Bobrick 2740.


                                                                               4
<PAGE>   36
            iii. Soap dispenser - Bobrick 822.

            iv.  Grab bar B6806 X 36"

            v.   Grab bar B6806 X 42"

        b.  Provide accessories in women's toilet as follows:

            i.   Paper towel dispenser and waste receptacle - Bobrick 3944.

            ii.  Double-roll toilet tissue holder - Bobrick 2740.

            iii. Soap dispenser - Bobrick 822.

            iv.  Grab bar B6806 x 36"

            v.   Grab bar B6806 x 42"

            vi.  Napkin-tampon disposal - Bobrick B822.

        c.  Provide mop and broom rack in each janitor closet.

    3.  DOCK BUMPERS

        a.  Provide dock bumpers at loading dock.

    4.  BLINDS

        a.  Provide 1" horizontal mini-blinds on exterior windows.

    5.  ELEVATORS

        a.  Provide two (2), 2500 lb. capacity, 125 fpm holeless hydraulic
            passenger elevators.

        b.  Provide one (1), 4500 lb. capacity, 100 fpm holeless hydraulic 
            elevator.

        c.  Include an allowance of $10,000 per passenger cab for interior 
            finishes.

        d.  Freight elevator cab finishes to be manufacturer's standard.

I.  MECHANICAL

    1.  FIRE PROTECTION

        a.  Include a wet pipe sprinkler system per the approval of all 
        required local governing authorities.

        b.  System to be designed for Light Hazard Occupancy and hydraulically
        calculated to meet a design density of 0.10 gallons per minute over
        the most remove 1,500 SF.

        c.  Provide maximum head spacing of 225 SF.

        d.  Provide semi-recessed pendant heads with chrome escutcheons.

    2.  HEATING, VENTILATION AND AIR CONDITIONING (HVAC)



                                                                               5
<PAGE>   37
          a.   HVAC through VAV roof top units.

          b.   All medium pressure duct will be installed.

          c.   All components of the HVAC system "upstream" of terminal units 
          will be installed.

          d.   All components "downstream" from the terminal units will be part 
          of the tenant costs.

          e.   Conditioned air will be supplied to the occupied spaces via a
          Variable Air Volume (VAV) Air Conditioning System thermostatically
          controlled from individual zones within each tenant's suite. Each zone
          will have a thermostat and will not exceed 1,200 SF. All corners,
          exterior exposures, large conference rooms, training rooms, and
          elevator equipment rooms will constitute a zone and will have a
          thermostat. Other area requiring special zoning consideration will be
          considered above and beyond zoning provided and will be addressed
          prior to design.

          f.   The air conditioning system will be designed to maintain space
          temperature of 75 degrees F in the summer and a minimum space
          temperature of 68 degrees F in the winter. ASHRAE 1% (99%) weather
          data will determine the outside design conditions used for load
          calculations. Also, the following internal heat gain will be assumed
          for load calculations:

                    Occupancy load      =  1 person per 150 SF
                    Lighting load       =  2 watts per SF
                    Other electric load =  2 watts per SF

          A minimum of 1 cfm per SF of conditioned supply air will be provided.
          Outside air will be supplied to the space per standards set forth by
          ASHRAE 62-1989, but not less than 20 cfm per person.

          g.   The air conditioning system will be controlled via a central
          control panel with modem and terminal. All controls will be DDC
          (Direct Digital Control). Zone sensors (thermostats) will have
          thumbwheel control between pre-determined setpoints and override
          capability. Automatic shut-down of the air handling units will be
          provided per Standard Mechanical Code. As required, stairwell
          pressurization and elevator shaft smoke removal controls will be
          provided per Standard Mechanical Code and Standard Building Code.

          h.   The Atrium shall be provided with a code required smoke exhaust
          system, via two exhaust fans.

J.   PLUMBING

     1.   System shall include all core area fixtures, risers, floor drains,
     roof drains and all associated piping. One (1) 20 gallon, 3kW, electric
     water heater shall be provided for each core restroom group.

K.   ELECTRICAL SYSTEMS  

     1.   ELECTRICAL DISTRIBUTION

          a.   Provide 3,000 amp, 480/277 volt, main switchboard.

          b.   Electrical service will be distributed to sub-panels in the 
          electrical room in each quadrant on each floor, as follows:

               i.   277/480 volt, 400 amp panelboard for mechanical equipment

               ii.  277/480 volt, 100 amp panelboard for lighting

                                                                               6



<PAGE>   38
               iii. 120/208 volt, 2 section, 250 amp, 84 pole panelboard served 
                    from a 480:208/120 volt, 75 kva transformer

          c.   An allowance of 2 watts per square foot is to be provided on 
          each floor for lighting and approximately 5 watts per square foot 
          for 208/120 volt receptacles.

     2.   EMERGENCY DISTRIBUTION
     
          a.   Provide emergency battery lighting for all public areas and 
          corridors.

     3.   TELEPHONE SYSTEM

          a.   Provide (4) 4" underground conduits from the telephone company
          manhold at the property line to the main telephone room. 4'x8'
          telephone backboards shall be provided in each electrical room on each
          floor with (2) 4" conduit to each quadrant riser from the main
          telephone backboard.


     4.   LIGHTING

          a.   Fluorescent strip lighting shall be used in all storage areas and
          equipment rooms.

          b.   Tenant area fluorescent fixtures will be stacked on the floor and
          ready to be installed. Fixtures shall be 2'x4' three lamp, 3" deep
          parabolic lens (one per 100 useable square feet). Each fixture shall
          have air return features.

          c.   All fluorescent fixtures shall utilize electronic ballast's and
          T8 lamps with 3500K color.

          d.   Provide decorative lighting in each lobby.

          e.   Provide PL downlights to product 30 foot-candles in core toilets
          and corridors.

     5.   LIFE SAFETY SYSTEMS
          a.   A complete addressable fire alarm and life safety system shall be
          provided, including pull stations, smoke detectors, flow switches,
          horns, annunciator panel and control panel. Smoke detectors shall be
          provided in mechanical supply and return ducts, Electrical Room,
          Mechanical rooms and elevator lobbies.

     6.   BRANCH CIRCUIT DISTRIBUTION

          a.   Lighting

               i.   One 20 amp, 277 volt circuit per column bay with three
               circuits per homerun junction box will be provided.

          b.   Receptacle Circuits

               i.   One (1) one inch (1") conduit per bay will be provided.

L.   OFFICE FINISHES

     1.   To be provided by Weeks to Tekelec at later date

M.   EXCLUSIONS



                                                                               7

<PAGE>   39
          1.   The following is not included:

                 i. Security System.

                ii. Telephone/Data wiring.

               iii. 24 hour cooling or computer room units.

                iv. Dust collection systems.





                                                                               8
<PAGE>   40
                                   EXHIBIT D

                             RULES AND REGULATIONS

     1.   The sidewalks, common areas, and public portions of the Building, 
such as entrances, passages, courts, elevators, vestibules, stairways, 
corridors or halls, and the streets, alleys or ways surrounding or in the 
vicinity of the Building shall not be obstructed by Tenant, even temporarily, 
or encumbered by Tenant or used for any purpose other than ingress to and 
egress from the Premises.

     2.   No awnings or other projections shall be attached to the outside 
walls of the Building.

     3.  No sign, advertisement, notice or other lettering shall be exhibited, 
inscribed, painted or affixed by Tenant on any part of the outside of the 
Premises or Building unless approved by Landlord. Signs on entrance doors 
shall, at Tenant's expense, be inscribed, painted or affixed for each tenant by 
sign makers approved by Landlord. In the event of the violation of the 
foregoing by Tenant, Landlord may remove same without notice to Tenant or any 
liability therefor, and may charge the expense incurred by such removal to 
Tenant.

     4.  The sashes, sash doors, skylights, windows, heating, ventilating and 
air conditioning vents and doors that reflect or admit light and air into the 
halls, passageways or other public places in the Building shall not be covered 
or obstructed by Tenant.

     5.  No show cases or other articles shall be put in front of or affixed to
any part of the exterior of the Building, nor placed in the public halls,
corridors, or vestibules without the prior written consent of Landlord.

     6.  The bathrooms and plumbing fixtures shall not be used for any purposes 
other than those for which they were designed, and no sweepings, rubbish, rags, 
or other substances shall be thrown therein. All damages resulting from any 
misuse of the bathrooms or fixtures shall be the responsibility of Tenant.

     7.  Tenant shall not in any way deface any part of the Premises or the 
Building.

     8.  No bicycles, vehicles, or animals of any kind shall be brought into 
or kept in our about the Premises, or in the Building. No cooking shall be done 
or permitted by Tenant on the Premises except in conformity with all applicable 
laws, statutes, regulations and ordinances and then only in the area designated 
as a kitchen, if any, on the Premises of Tenant, which is to be primarily used 
by Tenant's employees for heating beverages and light snacks, and in the 
cafeteria. Tenant shall not cause or permit any unusual or objectionable odors 
to be produced upon or permeate from the Premises.

     9.  [INTENTIONALLY DELETED.]

     10. No space in the Building shall be used for the sale of merchandise, 
goods, or property of any king at auction except for food items sold in the 
cafeteria located on the Premises.

     11. Tenant shall not make, or permit to be made, any unseemly or 
disturbing noises or disturb or interfere with occupants of the Building or 
neighboring buildings or premises or those having business with them, whether 
by the use of any musical instrument, radio, talking machine, unmusical noise, 
whistling, singing, or in any other way. Tenant shall not throw anything out of 
the doors, windows or skylights or down the passageways


     12. Neither Tenant, nor any of Tenant's servants, employees, agents, 
visitors, or licensees, shall at any time bring or keep upon the Premises any 
inflammable, combustible or explosive fluid, or chemical substance, other than 
reasonable amounts of cleaning fluids or solvents required in the normal 
operation of Tenant's business offices.

     13. No additional locks or bolts of any kind shall be placed upon any of 
the doors, walls, accessways, or windows by  Tenant, nor shall any changes be 
made in existing locks or the


<PAGE>   41
mechanism thereof, without the prior written approval of Landlord and unless 
and until a duplicate key or access card, as applicable, is delivered to 
Landlord. Tenant shall, upon the termination of its tenancy (i) return to 
Landlord all keys for the Premises and for any area of the Building, or common 
areas, either furnished to, or otherwise procured by Tenant, (ii) restore the 
locks, walls, accessways, windows, and doors to their original condition on the 
date of this Lease by removing any security measures installed by Tenant, 
repairing any damage to the Premises or to the Building as a result of the 
restoration and removal, and (iii) in the event of the loss of any keys 
furnished to Tenant by Landlord, Tenant shall pay to Landlord the cost thereof.

     14. Tenant shall not overload any floor.

     15. Tenant shall not occupy or permit any portion of the Premises to be 
used for the possession, storage, manufacture or sale of liquor, narcotics, or 
tobacco in any form.

     16. Tenant shall be responsible for all persons for whom it issues passes 
and/or keys and shall be liable to Landlord for all acts of such persons.

     17. The Premises shall not be used for lodging or sleeping or for any 
immoral or illegal purpose.

     18. The requirements of Tenant will be attended to only by Landlord or the 
property manager of the Premises.

     19. Canvassing, soliciting, and peddling in the Building are prohibited 
and Tenant shall cooperate to prevent the same.

     20. All paneling, and other wood products not considered furniture shall 
be of fire retardant materials.

     21. No smoking is permitted in the Premises, or in the Building. Smoking 
is permitted outside the Building in designated smoking areas. All cigarette 
butts and other refuse should be placed in designated containers.

     22. No weapons concealed or visible are permitted in the Premises, in the 
Building, or on the Land.

     23. Landlord shall not be responsible to Tenant or liable for the 
non-observance or violation of any of these Rules and Regulations by any other 
tenant.

     Whenever the above rules conflict with any of the rights or obligations of 
Tenant pursuant to the provisions of the Lease, the provisions of the Lease 
shall govern.

<PAGE>   42
                                   EXHIBIT E

                               ADJACENT PROPERTY


That 8.50 acre tract of land lying in the Cedar Fork Township, Morrisville, Wake
County, North Carolina, and being a portion of the tract found in Deed Book
(D.B.) 5605 Page (Pg.) 216-218 and Book of Maps (BOM) 1998 (Pg.) 1232 in the
Register of Deeds office of said Wake County, and being bounded on the North 
and East by Phase I Lot 8 Paramount Center; on the South by Proposed Paramount 
Parkway (100' Public right-of-way); and on the West by Proposed Road "A" (100' 
Public right-of-way); and being more particularly described as follows:

Beginning at a point in the Northern right-of-way line of said proposed 
Paramount Parkway and also being South 41 degrees 45 minutes 05 seconds West 
385.98 feet from an existing iron pipe, the Northwest corner of said Lot 8; 
thence leaving said Northern right-of-way line along a Phase line for Phases I 
and II, South 48 degrees 14 minutes 55 seconds East 61.24 feet to a point; 
thence North 90 degrees 00 minutes 00 seconds East 141.35 feet to a point; 
thence South 00 degrees 00 minutes 00 seconds East 250.34 feet to a point; 
thence North 90 degrees 00 minutes 00 seconds East 36.51 feet to a point; 
thence South 00 degrees 00 minutes 00 seconds East 322.48 feet to a point; 
thence Southwesterly 39.27 feet along a tangential curve to the right, central 
angle 90 degrees 00 minutes 00 seconds, radius 25.00 feet to a point; thence 
North 90 degrees 00 minutes 00 seconds West 195.69 feet to a point; thence 
South 00 degrees 00 minutes 00 seconds West 56.74 feet to a point; thence 
South 19 degrees 40 minutes 36 seconds West 114.00 feet to a point in the 
Eastern right-of-way line of said proposed Paramount Parkway; thence along the 
said Eastern right-of-way line of Paramount Parkway the following calls: 
Northwesterly 268.57 feet along a non-tangential curve to the left, central 
angle 15 degrees 27 minutes 55 seconds, radius 995.00 feet to a point of 
tangency; thence North 85 degrees 47 minutes 19 seconds West 114.70 feet to a 
point of curvature; thence Northwesterly 153.38 feet along a tangential curve 
to the right, central angle 33 degrees 32 minutes 30 seconds, radius 262.00 
feet to a point of tangency; thence North 52 degrees 14 minutes 49 seconds West 
11.29 feet to a point of curvature; thence leaving said proposed Paramount 
Parkway Eastern right-of-way line, Northwesterly 49.22 feet along a tangential 
curve to the right, central angle 93 degrees 59 minutes 54 seconds, radius 
30.00 feet to a point of tangency in the said Eastern right-of-way line of Road 
"A"; thence along said Eastern right-of-way line of Road "A", North 41 degrees 
45 minutes 05 seconds East 849.98 feet to the Point of Beginning.

Said parcel contains 8.50 acres and is the same as shown in a Preliminary Site 
Plans entitled "PARAMOUNT CENTER - LOT 8" prepared by DSAtlantic Corporation 
and dated May 20, 1998 with a last revision date of August 15, 1998.

The boundary description prepared from the Site Plan embodies the Surveyor's 
opinion of the location of the boundary lines of the tract and is not to be 
construed as a certification to quality of title to the property.




<PAGE>   1
                                                               EXHIBIT 10.17


                                January 13, 1999


PERSONAL AND CONFIDENTIAL
- -------------------------

Teresa Pippin
101 Fountain Hills Road
Garland, Texas  75044


Dear Teresa:

                  On behalf of Tekelec, I am pleased to offer you employment as
Vice President, Human Resources of Tekelec, on the terms and conditions set
forth in this letter. As Vice President, Human Resources, you will report
directly to Tekelec's Chief Executive Officer, will be principally responsible
for Tekelec's human resources matters and will have such other duties and
responsibilities as may be delegated to you from time to time by the Chief
Executive Officer or the Board of Directors. You may select your start date so
long as it is on or before February 15, 1999.

                  Your compensation and benefits will be as follows:

                  1.  Your starting annual base salary will be $200,000 (i.e.,
$7,692.31 per bi-weekly period).

                  2.  You will be eligible to participate in Tekelec's 1999
Officer Bonus Plan, with your participation to be calculated as if you were a
full time employee as of January 1, 1999 and determined in accordance with a
percentage of your 1999 base salary. Under the terms of the 1999 Officer Bonus
Plan, you will be eligible to receive up to 50% of your annual base salary as a
cash bonus if Tekelec achieves certain financial milestones in 1999. For 1999,
you will be guaranteed a minimum bonus of $50,000 which will be paid during the
first quarter of 2000.

                  3.  You will be entitled to take four weeks personal time
annually.

                  4.  You will receive applicable benefits, including health,
dental, vision, long-term disability and life insurance, as are generally
provided to Tekelec's executive officers.

                  5.  You will be offered the opportunity to participate in
Tekelec's Employee Stock Purchase Plan and 401(k) Plan upon your satisfaction of
the eligibility requirements for such plans.


<PAGE>   2


Teresa Pippin
January 13, 1999
Page 2


                  6.  You will be covered by Tekelec's Officer Severance Plan (a
copy of which has been previously provided to you).

                  7.  The Compensation Committee of Tekelec will grant to you
stock options (incentive stock options to the maximum extent permitted under
law, with the balance being nonstatutory stock options) under Tekelec's 1994
Stock Option Plan (the "Plan") to purchase 180,000 shares of Tekelec Common
Stock ("Options"), effective as of the later of your start date or the date of
the Compensation Committee's action granting such options (the "grant date").
The exercise price of your Options will be equal to the closing price of
Tekelec's Common Stock on the grant date (as reported in The Wall Street Journal
on the first business day following the grant date). Your Options will vest to
the extent of 36,000 shares on the one-year anniversary of your start date. The
remaining 144,000 shares will vest and become exercisable cumulatively in 16
equal quarterly installments of 9,000 shares each, with the first installment
vesting on June 30, 2000 and one additional installment vesting on the last day
of each calendar quarter thereafter as long as you remain an employee of
Tekelec. Your Options will expire, to the extent previously unexercised, upon
the earlier of ten years from the date of grant or a date not less than three
months after you cease to be a Tekelec employee as determined in accordance with
the terms of the Plan. The Options will in all respects be subject to the terms
and provisions of the Plan and the stock option agreement evidencing the grant
of the Options. In addition to the foregoing grant, it is anticipated that the
Compensation Committee will periodically, typically annually, consider whether
additional options should be granted to you while you remain an officer of the
Company.

                  8.  Although your position will be based in Dallas, Texas, 
your duties will require you to travel as needed to Tekelec offices worldwide.

                  You are aware that Tekelec prohibits employees from unlawfully
using confidential or proprietary information belonging to any other person or
entity. By signing the enclosed copy of this letter, you agree not to disclose
or use or induce Tekelec or any of its employees to use any trade secrets or
confidential or proprietary information belonging to any of your former
employers.

                  As a condition of commencing your employment with Tekelec, you
will be required to sign Tekelec's standard "Confidentiality and Non-Disclosure
Agreement and Assignment of Rights" (a copy of which will be provided to you
under separate cover). As with every Tekelec employee, you reserve the right to
terminate your employment at any time, and we reserve the right to terminate
your employment at will. We hope and expect, however, that this will be a long
and mutually beneficial relationship.


<PAGE>   3


Teresa Pippin
January 13, 1999
Page 3


                  This letter agreement contains our entire understanding with
respect to your employment with Tekelec. The provisions of this letter may be
amended only by a writing signed by you and Tekelec. If you have any questions
about the meaning of any of the terms or provisions included herein, please let
me know at your earliest convenience. This letter agreement shall be construed
under the laws of California.

                  Teresa, we believe that Tekelec can provide you with
opportunities for professional growth and financial return. We look forward to
working with you and to a mutually fulfilling and rewarding relationship.

                  If this letter agreement is acceptable to you, then please
acknowledge your acceptance by signing and dating the enclosed copy of this
letter agreement where indicated below and then faxing (fax number:
818.880.0176) and returning such signed copy to me for receipt no later than
January 21, 1999.

                                           Sincerely,


                                           /s/ Michael L. Margolis
  
                                           Michael L. Margolis
                                           Chief Executive Officer and President



Acknowledged and Accepted:

     /s/ Teresa Pippin
- ----------------------------------         Date:  January 21, 1999
         Teresa Pippin

<PAGE>   1

                                                                    EXHIBIT 21.1




                         SUBSIDIARIES OF THE REGISTRANT


<TABLE>
<CAPTION>
                                            STATE OR OTHER JURISDICTION OF
NAME OF SUBSIDIARY                          INCORPORATION OR ORGANIZATION
- ------------------                          -----------------------------
<S>                                         <C>
Tekex Corporation                           California
Tekex Limited                               U.S. Virgin Islands
Tekelec, Ltd.                               Japan
Tekelec Canada Inc.                         Canada
Chameleon Network Systems, Limited          United Kingdom
Protocol Technologies, Inc.                 California
Chameleon Network Systems                   California
Tekelec Limited                             United Kingdom
</TABLE>

- --------------
* The subsidiaries of the Registrant do not do business under any name other
than as listed above.



<PAGE>   1

                                                                EXHIBIT 23.1



                       CONSENT OF INDEPENDENT ACCOUNTANTS


We consent to the incorporation by reference in the following Registration
Statements of Tekelec on Form S-8 (Registration Nos. 33-48079, 33-82124,
33-60611, 333-05933, 333-28887, 333-37843 and 333-71261) and on Form S-3
(Registration No. 33-62035) of our report dated February 2, 1999, on our audits
of the consolidated financial statements and financial statement schedule of
Tekelec as of December 31, 1998 and 1997, and for the years ended December 31,
1998, 1997 and 1996, which report is included in this Annual Report on Form
10-K.


/s/
PricewaterhouseCoopers LLP
Woodland Hills, California
March 29, 1999


<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<CASH>                                          31,932
<SECURITIES>                                    37,704
<RECEIVABLES>                                   56,502
<ALLOWANCES>                                       763
<INVENTORY>                                     12,872
<CURRENT-ASSETS>                               150,975
<PP&E>                                          38,692
<DEPRECIATION>                                  25,833
<TOTAL-ASSETS>                                 210,242
<CURRENT-LIABILITIES>                           42,213
<BONDS>                                              0
                                0
                                          0
<COMMON>                                        92,803
<OTHER-SE>                                      72,974
<TOTAL-LIABILITY-AND-EQUITY>                   210,242
<SALES>                                        176,669
<TOTAL-REVENUES>                               176,669
<CGS>                                           58,902
<TOTAL-COSTS>                                   58,902
<OTHER-EXPENSES>                                66,829
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                 55,551
<INCOME-TAX>                                    16,342
<INCOME-CONTINUING>                             39,209
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    39,209
<EPS-PRIMARY>                                     0.73<F1><F2>
<EPS-DILUTED>                                     0.67<F1><F3>
<FN>
<F1>On July 6, 1998, the Company effected a two-for-one split of its outstanding
shares of Common Stock.
<F2>Data listed for "EPS-PRIMARY" is the newly defined "BASIC EPS".
<F3>Data listed for "EPS-DILUTED" is the newly defined "DILUTED EPS".
</FN>
        

</TABLE>


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