VITESSE SEMICONDUCTOR CORP
10-K405, 1998-12-23
SEMICONDUCTORS & RELATED DEVICES
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                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

                                   FORM 10-K
                                        
(Mark One)
          [X]  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF
                   THE SECURITIES EXCHANGE ACT OF 1934
                   For the fiscal year ended September 30, 1998

                                       or

          [ ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF
                   THE SECURITIES EXCHANGE ACT OF 1934
                   For the transition period from ...... to ......

                         COMMISSION FILE NUMBER 0-19654
                                        

                       VITESSE SEMICONDUCTOR CORPORATION
             (Exact name of registrant as specified in its charter)

         DELAWARE                               NO. 77-0138960
   (State or other jurisdiction of              (I.R.S. Employer
   incorporation or organization)               Identification No.)

                     741 CALLE PLANO, CAMARILLO, CA  93012
                    (Address of principal executive offices)

      Registrant's telephone number, including area code:  (805) 388-3700

       Securities registered pursuant to Section 12(b) of the Act:  NONE

          Securities registered pursuant to Section 12(g) of the Act:
                         COMMON STOCK, $0.01 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. [X]

  The aggregate market value of the voting stock held by non-affiliates of the
registrant, based upon the closing sale price of the Common Stock on September
30, 1998 as reported on the Nasdaq National Market, was approximately
$1,354,962,498.  Shares of Common Stock held by each officer and director and by
each person who owns 5% or more of the outstanding Common Stock have been
excluded in that such persons may be deemed to be affiliates.  This
determination of affiliate status is not necessarily a conclusive determination
for other purposes.

  As of September 30, 1998, the registrant had outstanding 73,788,136 shares of
Common Stock.

================================================================================
<PAGE>
 
                                     PART I

ITEM 1.  BUSINESS

  Certain statements in this Annual Report on Form 10-K, including certain
statements contained in "Business" and "Management's Discussion and Analysis of
Financial Condition and Results of Operations," constitute "forward-looking
statements" within the meaning of Section 27A of the Securities Act of 1933, as
amended (the "Securities Act"), and Section 21E of the Securities Exchange Act
of 1934, as amended (the "Exchange Act").  Such forward-looking statements
involve known and unknown risks, uncertainties and other factors which may cause
the actual results, performance or achievements of the Company to be materially
different from any future results, performance or achievements expressed or
implied by such forward-looking statements.  See "Management's Discussion and
Analysis of Financial Condition and Results of Operations--Factors Affecting
Future Operating Results."

  Vitesse is a leader in the design, development, manufacturing and marketing of
digital GaAs ICs.  The Company's products incorporate its proprietary H-GaAs
(high integration gallium arsenide) technology to produce high-performance ICs
primarily for telecommunications, data communications and automated test
equipment (ATE) systems providers.  The Company believes H-GaAs technology
provides significant advantages over silicon-based IC technologies in addressing
the combination of speed, power dissipation and complexity requirements of these
high-performance systems providers.  In fiscal 1998, sales of
telecommunications, data communications and ATE products represented 51%, 23%
and 26%, respectively, of the Company's total revenues.  The Company's major
customers include Alcatel, Cisco, Credence, Ericsson, Fujitsu, IBM, Lucent, NEC,
Schlumberger, Seagate, Tellabs and Teradyne.

BACKGROUND

 Telecommunications Market

  As a result of deregulation and heightened competition in the worldwide
telecommunications industry over the past decade, domestic and foreign public
network service providers have been forced to differentiate themselves by being
more responsive and offering new and better services at lower costs.  The volume
of information required to be transmitted across public networks has increased
significantly in recent years as a result of a variety of factors, including the
increase in data transmission and facsimile use, the rapid growth of the
internet, the emergence of corporate virtual private networks ("VPNs"), and the
development of new applications such as video conferencing and multimedia.
Public network service providers, including interexchange long distance carriers
("IXCs") and local exchange carriers ("LECs"), have been required to upgrade
their infrastructure to provide high-speed data services to customers to meet
these needs in addition to providing their standard telephone services.
Infrastructure improvements to public networks have most prominently included a
dramatic increase in the deployment of fiber optic technology to replace
conventional copper wire.  Since optical fiber offers substantially greater
capacity, is less error prone and is easier to administer than copper wire, it
has become the transmission medium of choice for IXCs and, increasingly, LECs.

  As fiber optic technology has spread, existing network standards for the
transmission of information, which had been developed primarily for copper wire
networks, have presented limitations to simultaneously transmitting voice and
data.  As a result, the SONET (Synchronous Optical Network) standard in the
United States and the equivalent SDH (Synchronous Digital Hierarchy) standard in
the rest of the world emerged as the next generation standards for high-speed
optical fiber transmission.  The SONET/SDH standard facilitates high data
integrity and improved performance in terms of network reliability and reduces
maintenance and other operations costs by standardizing interoperability among
different vendors' equipment.
 
  More recently, the demand for system bandwidth is being addressed by
transmitting multiple channels on a single fiber by a technique called
wavelength division multiplexing ("WDM").  The adoption of WDM has enabled
system operators to significantly increase system bandwidth without having to
bury additional fiber cables, a long and costly process.  While WDM increases
the bandwidth carried by each optical fiber, it does not reduce the number of
electronic components required.  Instead, WDM has accelerated the growth of
SONET/SDH deployment by eliminating fiber installation as a growth limiter.

                                       1
<PAGE>
 
  Asynchronous transfer mode ("ATM") is a data transmission standard
complementary to SONET/SDH that is in an early stage of development.  ATM takes
advantage of the additional capacity provided by fiber optic technology.  The
SONET/SDH standard relates to the system through which data is transmitted,
while ATM is a protocol for the packaging of data for transmission over the
SONET/SDH system.  ATM technology enables LAN, WAN and public network systems
designers to provide increasingly improved services to network users.  LAN and
WAN equipment vendors must enable the integration of mixed high-speed, high-
volume data communications, voice, video and imaging applications, reduce
bandwidth limitations of current LANs and WANs, lower equipment costs and ease
administrative burdens imposed by current system architectures.  Similarly,
equipment vendors must provide systems that can handle integrated-switched high-
speed, high-volume data communications, voice, video and imaging services.
Public network equipment vendors must also seamlessly integrate their products
with both LAN and WAN equipment to reduce overall networking costs.

  Fiber optic applications designed to the SONET/SDH and ATM standards use data
transmission rates of 155 MHz, 622 MHz, 2.488 GHz or 10 GHz.  The Company
believes that SONET/SDH transmission systems installed by network providers
generally operate at 2.488 GHz and above.  The Company also believes that
silicon-based approaches are not practicable solutions at such frequencies and,
as a result, telecommunications systems manufacturers increasingly look to GaAs
solutions because of their requirements for high bandwidth.

 Data Communications Market

  Performance improvements in processors and peripherals, along with the
transition to distributed architectures such as client/server, have spawned
increasingly data-intensive and high-speed networking applications.  This has
led to a focus on the methods of connecting high-performance computers to
peripheral equipment in the data communications industry.

  In 1988, the American National Standards Institute established a Fibre Channel
standard, which is a practical, inexpensive, yet expandable method for achieving
high-speed data transfer among workstations, mainframes, data storage devices
and other peripherals.  The Fibre Channel standard addresses the need for very
fast transfers of large volumes of information, while at the same time relieving
system manufacturers from the burden of supporting the variety of networks and
channels currently in place.  Fibre Channel is especially effective in
situations where large blocks of data must be transferred within and between
buildings and over campus environments.  Fibre Channel is substantially faster
than existing network data transmission protocols.  Fibre Channel is capable of
transmitting at rates exceeding 1 gigabit per second in both directions
simultaneously and is also able to transport existing protocols over both
optical fiber and copper wire.  Currently, the most prominent use of Fibre
Channel technology is in high-density rigid disk drives of 1 gigabyte or
greater.

  In the LAN environment, Ethernet is currently the most widespread standard,
operating at 10 to 100 megabits per second.  However, LAN backbones are rapidly
being upgraded to Gigabit Ethernet and ATM in order to increase available
bandwidth.  These network protocols, which enable expanded bandwidth in excess
of one gigabit per second, are emerging as the new standards for LAN backbones.

  The Company believes that CMOS silicon approaches are not practicable
solutions at the 1 gigabit per second or higher clock rates used in the Fibre
Channel and Gigabit Ethernet standards.  The Company believes that its H-GaAs
solutions for these markets operate at lower power and greater performance
margins than competing ECL and BiCMOS ICs.

 Automated Test Equipment Market

  ATE is used for the comprehensive testing of ICs, printed circuit boards and
electronic systems.  The increasing worldwide demand for ICs in recent years has
led to an increase in the demand for IC test equipment.  The ATE industry has
experienced changes arising from the increasing complexity of ICs, as manifested
by growing pin counts, higher speeds and greater levels of integration.  These
changes have created challenges for ATE systems designers, since the equipment
used to test these complex devices must be capable of performance exceeding that
of the devices themselves.

                                       2
<PAGE>
 
  These changes have also led to major revisions in ATE architectures.
Historically, ATE systems were primarily based on a central resource
architecture where timing and pattern generation hardware and software were
centralized and allocated as needed to groups of pins on the "device under test"
("DUT").  Central resource architecture works best with relatively simple ICs,
but with newer, higher complexity devices, the test environment can be
significantly different for each pin.  This has led to a "tester-per-pin"
architecture in which tester resources are dedicated to each pin of the DUT.
This rapid increase in system complexity has resulted in a marked increase in
the number of electronic components needed in the pin channel.  The Company
believes these factors have led ATE designers to seek to increase component
integration.

  For high-performance ATE systems, the Company believes that CMOS and BiCMOS
silicon ICs are too slow and that the high power dissipation in ECL silicon ICs
limits their integration capabilities.  The Company believes that the low power
dissipation and high complexity of the Company's H-GaAs ICs, which permit
systems to be built with fewer ICs, are well-suited for the increasingly
demanding requirements of present generation ATE equipment.

STRATEGY

  The Company's strategy includes the following elements:

 Target Growing Markets

  Vitesse targets the growing telecommunications, data communications and ATE
markets.  Within the telecommunications and data communications markets, the
Company's products are used in emerging high-growth markets such as SONET/SDH,
ATM, Fibre Channel, and Gigabit Ethernet, which require ICs that are capable of
high-bandwidth data transmission.

 Reduce Costs of High-Performance Products

  The Company continually strives to reduce the cost of its high-performance
products.  The Company endeavors to continue to increase manufacturing yields
and decrease die sizes, as well as to decrease power dissipation to enable the
use of lower-cost plastic packaging.  Another critical element of this strategy
involves the integration of multiple functions onto a single chip.

 Perform Own Wafer Fabrication Using Proprietary Manufacturing Process
 Technology

  The Company operates its own advanced wafer fabrication facilities in
Camarillo, California and in Colorado Springs, Colorado.  The Company believes
that control of wafer fabrication assures a reliable source of supply and
provides greater opportunities to enhance product quality and reliability.  In
addition, the Company believes such control facilitates new process and product
development and provides a more dependable wafer supply to meet customer
requirements.

  The Company's proprietary manufacturing process utilizes industry standard
manufacturing equipment.  This enables the Company to employ developments in
silicon manufacturing technology to continue to improve minimum feature size,
dimension control, deposition and etch capabilities.  By eliminating the need
for "custom" wafer fabrication equipment, the Company can focus its resources on
developing leading process technology rather than on developing expensive
customized manufacturing equipment.

 Develop "GaAs Transparent" Products

  The Company endeavors to make the process of designing Vitesse GaAs products
"transparent" to the designer when compared to the design process for silicon
ICs.  The design of its H-GaAs products is conducted using methodologies and CAD
tools essentially identical to those used to design silicon products.  Customers
designing Vitesse ASIC products can use industry standard CAD tools (including
those offered by Cadence, Mentor Graphics, Synopsys and Viewlogic) in such a
manner that there are no "GaAs-unique" factors that require special background
or training beyond those for an ASIC designer generally.  In addition, the
Company's products do not require electronic systems manufacturers to change
input/output interface levels or utilize power supply voltages unique to Vitesse
products.

                                       3
<PAGE>
 
 Establish Close Relationships with Customers' Engineering Management

  The Company establishes close relationships with its customers' engineering
management and believes these relationships enable it to better understand the
customers' needs and win designs for existing and new systems.

PRODUCTS AND CUSTOMERS

 Telecommunications

  Telecommunications products accounted for 51% and 52% of the Company's total
revenues for fiscal 1998 and fiscal 1997, respectively.  In fiscal 1998,
substantially all of the Company's sales in the telecommunications market were
for SONET/SDH applications.  In fiscal 1998, the Company's significant
telecommunications customers, each of which purchased at least $100,000 of the
Company's products, included Alcatel, Ciena, Ericsson, Fujitsu, Lucent, NEC and
Tellabs.

  The Company manufactures a variety of telecommunications IC products for the
transmission and reception of data over a fiber optic network.  The Company
supplies these products as Company standard products or as customer-designed
ASIC products.  With respect to the transmission of data, the Company's products
take parallel data, code it and serialize it (multiplexing or "mux") for
transmission.  At the receiving end of the fiber optic system, the Company's
telecommunications products decode and de-serialize the data (demultiplexing or
"demux").

  In the case of telecommunications switching, the Company offers a line of
crosspoint switches for high-speed digital switching applications including data
distribution and video switching.  The Company also offers a line of
photodetector/transimpedance amplifiers for both telecommunications and data
communications applications which offer a low noise and wide bandwidth solution
for converting light from a fiber optic communications channel into an
electrical signal.  The following is a summary of applications and related
operating frequencies which the Company's telecommunications products address:
 
                        Associated             Crosspoint  Transimpedance
     SONET Hierarchy    Clock Rate   MUX/DMUX   Switches     Amplifiers
     ---------------    ----------   --------   --------     ----------
     STS/OC-3             155 MHz        X          X            X
     STS/OC-12            622 MHz        X          X            X
     STS/OC-48          2.488 GHz        X
     STS/OC-192            10 GHz        X

 Data Communications

  Data communications products accounted for 23% and 22% of the Company's total
revenues for fiscal 1998 and fiscal 1997, respectively.  Vitesse has developed a
line of Fibre Channel products for this market, which consist primarily of
transmitters, receivers, transceivers, repeaters, and port bypass circuits.
Additionally, the Company has developed physical layer interface products for
the recently emerging Gigabit Ethernet and ATM markets.  The Company is also in
the process of developing additional products for these markets.  In fiscal
1998, the Company's significant data communications customers, each of which
purchased at least $100,000 of the Company's products, included Cisco, IBM,
Newbridge Networks, Seagate, Sequent and Sun Microsystems.

 Automated Test Equipment

  ATE products accounted for 26% and 22% of the Company's total revenues for
fiscal 1998 and fiscal 1997, respectively.  Vitesse provides gate arrays and
custom products that offer a combination of high complexity, low power
dissipation and high speed for ATE.  More recently, the Company has introduced a
line of standard products targeted at the ATE industry.  In fiscal 1998, the
Company's significant ATE customers, each of which purchased at least $100,000
of the Company's products, included Ando, Credence, Integrated Measurement
Systems, LTX, Schlumberger and Teradyne.

                                       4
<PAGE>
 
  The Company's ten largest customers accounted for approximately 69% and 77% of
total revenues in fiscal 1998 and fiscal 1997, respectively.  In fiscal 1998 and
fiscal 1997, sales to Lucent accounted for 23% and 20%, respectively, of the
Company's total revenues, and sales to Schlumberger accounted for 15% and 12%,
respectively, of the Company's total revenues.

TECHNOLOGY

  The Company believes the limitations of silicon-based CMOS, BiCMOS, and ECL
ICs have become more pronounced as the requirements of the telecommunications,
data communications and ATE systems providers have increased.  While CMOS offers
certain complexity advantages over the alternative silicon processes, the
Company believes it lacks the speed required for many high-performance systems.
ECL technology offers higher speeds but at the cost of high power dissipation,
which limits its use for high-complexity applications.  BiCMOS offers higher
performance than is obtainable from CMOS, but less than that offered by ECL, at
levels of complexity which are greater than that available from ECL but lower
than that provided by CMOS.  BiCMOS is slower than ECL and, the Company
believes, does not achieve the speed necessary for the highest performance
telecommunications, data communications and ATE systems.

  GaAs has inherent physical properties which allow electrons to move several
times faster than within silicon.  This higher electron mobility provides the
Company with the flexibility to manufacture ICs that operate at much higher
speeds than silicon devices or to operate at the same speeds with reduced power
consumption.  The following table compares the intrinsic transistor performance
and cost per function for H-GaAs with alternative process technologies:

                             H-GaAs      ECL      BiCMOS     CMOS
                            --------   -------   --------   -------
     Speed...............   Highest     High     Moderate   Lowest
     Power Dissipation...     Low      Highest   Moderate   Lowest
     Complexity..........     High     Lowest     Higher    Highest
     Cost per Function...   Moderate   Highest   Moderate   Lowest

  The Company employs proprietary H-GaAs process technology based on a
refractory metal self-aligned gate ("SAG") process.  SAG technology is
universally used in the manufacture of complex silicon ICs.  The process
structure and logic implementation of the Company's GaAs ICs are similar to a
traditional silicon MOS process with the exception that the gate metal is
deposited directly on the GaAs substrate creating a metal-semiconductor junction
comparable to depositing the metal on a thin oxide layer grown on the silicon
substrate in the case of metal gate n-channel MOS.

  The implementation of a SAG process in GaAs or silicon requires a gate metal
structure that can withstand the high temperature of an ion implant activation
anneal.  This is in contrast to conventional microwave GaAs ("RF GaAs") process
technologies which utilize a low temperature, non-self-aligned technology based
on gold as the gate metal.  The table below compares Vitesse's H-GaAs,
traditional silicon MOS and microwave RF-GaAs:

                                  Silicon    Microwave
                        H-GaAs      MOS       RF-GaAs
                       --------   --------   ---------
     Self-Aligned...     Yes        Yes         No
     Interconnect...   Aluminum   Aluminum     Gold
     Complexity.....     High     Highest     Medium

  Another advantage of SAG technology in GaAs is the greater control over
electrical transistor parameters compared to conventional gold gate technology.
This control of the field effect transistor ("FET") characteristics has enabled
the Company to be one of the few companies that have demonstrated the ability to
manufacture products having lower power dissipation using direct coupled FET
logic ("DCFL").  DCFL has the highest complexity, fewest elements per logic
function and best available combination of speed at low power of any n-channel
FET technology demonstrated in silicon or GaAs.

  The use of a high-temperature process also allows Vitesse to use silicon
industry standard aluminum interconnect technology.  This enables the Company to
utilize standard deposition and dry etch equipment for interconnects.  The
interconnect portion of the circuit represents a majority of mask levels in the
manufacturing process.

                                       5
<PAGE>
 
  The Company has significantly improved its process technology:
<TABLE>
<CAPTION>
                                                H-GaAs      H-GaAs      H-GaAs       H-GaSs
                                                  I           II         III          IV
                                                ------      ------      ------       ------
<S>                                             <C>         <C>         <C>          <C>
     Product Announcement Year...............     1986        1988       1991         1995
     Gate Length.............................   1.2mum      0.8mum      0.6mum       0.4mum
     Metal Layers............................      2           3           4            5
     Maximum Relative Speed(1)...............     1.0x        1.4x        2.0x         3.0x
     Minimum Relative Power Dissipation(1)...     1.0x        0.7x        0.5x         0.3x
</TABLE>
- ------------
(1)  Compared to H-GaAs I.

  The Company's H-GaAs IV 0.4 micron five-layer metal GaAs FET technology is
capable of achieving higher complexity and lower power dissipation than previous
Vitesse technologies.  The Company manufactures various standard products as
well as ASICs based on the GLX family of gate arrays and the SLX family of
standard cell ICs.  The GLX family of gate arrays has been designed to offer the
same speed as the H-GaAs III family of gate arrays, but with lower power
dissipation.  This is intended to enable ICs to be packaged in a lower cost
plastic package in the 100 MHz to 800 MHz range, thereby offering the customer a
lower cost solution in this performance range.

MANUFACTURING

 Wafer Fabrication

  The Company fabricates four-inch wafers at its Camarillo plant in a 6,000
square foot clean room, which has a rating of Class 10 (meaning there are fewer
than ten particles larger than 0.5 micron per cubic foot of air).  In 1998 the
Company started fabricating six-inch wafers at a newly constructed plant in
Colorado Springs, Colorado which includes a 15,000 square foot Class 1 clean
room.  Wafer fabrication equipment used by the Company is generally identical to
that used in a sub-micron silicon MOS fabrication facility.  Process technology
is generally similar to that used in advanced sub-micron silicon process
technologies, with certain modifications necessary to accommodate GaAs material
properties.

  As is typically the case with semiconductor manufacturing, the Company's
manufacturing yields vary significantly among products, depending on the
product's complexity and the Company's experience in manufacturing the
particular ICs.  While the Company's process technology utilizes standard
silicon semiconductor manufacturing equipment, aggregate production quantities
have been relatively low and the process technology is significantly less
developed than silicon process technology used by competitors.  This leads to
overall yields lower than levels typically achieved in the silicon process.  The
Company expects that many of its current and future products may never be
produced in high volume.

  Regardless of the process technology used, the fabrication of ICs is a highly
complex and precise process.  Defects in masks, impurities in the materials
used, contamination of the manufacturing environment, equipment failure and
other difficulties in the fabrication process can cause a substantial percentage
of wafers to be rejected or numerous die on each wafer to be non-functional.

  By utilizing standard silicon IC manufacturing equipment the Company is able
to employ developments in silicon manufacturing technology to continue to
improve minimum feature size, dimension control, deposition and etch
capabilities.  By eliminating the need for `custom" wafer fabrication equipment,
the Company can focus its resources on developing leading process technology
rather than on developing expensive customized manufacturing equipment.

 Assembly and Test

  A majority of the Company's ICs are packaged in plastic by third parties.  The
Company conducts ceramic package assembly for a portion of its ICs in its
Camarillo plant.  The Company employs industry standard assembly equipment in an
automated assembly line that is intended to reduce packaging time as well as to
improve quality.  For final testing, the Company utilizes advanced automated
VLSI testers and has constructed several custom testers.  However, in many
cases, the Company cannot test its products at full speed and must rely on
numerous sub-circuit path measurements to determine the performance of the IC.

                                       6
<PAGE>
 
 Components and Raw Materials

  The Company purchases the majority of its ceramic packages from Kyocera.
Kyocera is the world's largest supplier of multilayer, high-performance ceramic
packages and, in many cases, is the only source of these packages.  Since most
of the ceramic packages used in the Company's assembly process are designed to
the Company's specifications, there are typically no second sources for these
packages.  To date, the Company has not experienced any adverse effects due to
the sole-source nature of its ceramic packages.  The Company believes it
maintains an adequate inventory of sole-source ceramic packages.  The level of
inventory of ceramic packages carried by the Company is substantially higher
than standard plastic packages for IC companies that utilize standard packages
available from a wide variety of sources.  Since 1992, the Company has increased
its use of plastic packages, and it uses multiple contract manufacturers to
perform plastic packaging.

  GaAs substrates and other raw materials and equipment used in the production
of the Company's ICs are available from several suppliers.  Although lead times
are occasionally extended in the industry, the Company has not experienced any
material difficulty in obtaining raw materials or equipment.

ENGINEERING, RESEARCH AND DEVELOPMENT

  The market for the Company's products is characterized by rapid changes in
both GaAs and competing silicon process technologies.  Because of continual
improvements in these technologies, the Company believes that its future success
will depend largely on its ability to continue to improve its product and
process technologies, to develop new technologies in order to maintain the
performance of its products relative to competitors, to adapt its products and
process technologies to technological changes and to adopt emerging industry
standards.

 Product Research and Development

  The Company's present product research and development efforts are focused on
developing new products for its telecommunications, data communications and ATE
product lines.  Considerable design effort is being expended to increase the
speed and complexity and reduce the power dissipation of the Company's products.

 Process Research and Development

  The Company has implemented H-GaAs IV, a 0.4 micron GaAs FET technology that
offers higher complexity and lower power dissipation than previous Vitesse
technologies.  The Company is currently engaged in research and development
projects focused on other process-related improvements to increase yields and
improve the speed, complexity and power dissipation characteristics of its
devices.

  The Company's engineering, research and development expenses in fiscal 1998,
1997 and 1996 were $27,915,000, $16,804,000 and $11,045,000, respectively.

COMPETITION

  The high-performance semiconductor market is highly competitive and subject to
rapid technological change, price erosion and heightened international
competition.  The telecommunications, data communications and ATE industries,
which are the primary target markets for the Company, are also becoming
intensely competitive because of deregulation and heightened international
competition, among other factors.  In the telecommunications market, the Company
currently competes primarily against other GaAs-based companies such as Triquint
Semiconductor and the GaAs fabrication operations of system companies such as
Rockwell.  In the data communications and the ATE markets, the Company competes
primarily against silicon ECL and BiCMOS products offered principally by
semiconductor manufacturers such as Fujitsu, Hewlett Packard, Motorola, National
Semiconductor and Texas Instruments and bipolar silicon IC manufacturers such as
Applied Micro Circuits Corporation and Synergy Semiconductor Corporation.  Many
of these companies have significantly greater financial, technical,
manufacturing and marketing resources than the Company.  In addition, in lower-
frequency applications, the Company faces increasing competition from CMOS-based
products, particularly as the performance of such products continues to improve.

                                       7
<PAGE>
 
  Competition in the Company's markets for high-performance ICs is primarily
based on price/performance, product quality and the ability to deliver products
in a timely fashion.  Some prospective customers may be reluctant to adopt
Vitesse's products because of perceived risks relating to GaAs technology.  In
addition, product qualification is typically a lengthy process and certain
prospective customers may be unwilling to invest the time or incur the costs
necessary to qualify suppliers such as the Company.  Prospective customers may
also have concerns about the relative speed, complexity and power advantages of
the Company's products compared to more familiar ECL of BiCMOS semiconductors or
about the risks associated with relying on a relatively small company for a
critical sole-sourced component.

SALES AND CUSTOMER SUPPORT

  The Company's principal method of selling its products is through direct sales
to systems manufacturers by the Vitesse sales force.  In certain markets such as
Japan, the Company also employs value-added distributors.

  Because of the large engineering support required in connection with the sale
of high performance ICs, the Company provides its customers with field
engineering support as well as engineering support from the Company's
headquarters.  Typically, a field engineer will accompany a salesperson to the
initial customer visit to understand and evaluate the customer's requirements.
The salesperson and field engineer will determine whether additional engineering
analysis will be required by engineers based at the Company's headquarters.  The
Company's sales cycle is typically lengthy and requires the continued
participation of salespersons, field engineers, engineers based at the Company's
headquarters, and senior management.

  The Company's sales headquarters is located in Camarillo, California.  The
Company has 12 additional sales and field application support offices in the
United States, and one each in Germany, Italy and Japan.

  The Company generally warrants its products against defects in materials and
workmanship for a period of one year.

LICENSES AND PATENTS

  The Company has been awarded 14 U.S. patents for various aspects of design and
process innovations used in the design and manufacture of its products.  The
Company has two patent applications pending in the U.S. and three patent
applications pending in Japan and is preparing to file several more patent
applications.  The Company believes that patents are of less significance in its
industry than such factors as technical expertise, innovative skills and the
abilities of its personnel.

  As is typical in the semiconductor industry, the Company has, from time to
time, received, and may receive in the future, letters from third parties
asserting patent rights, maskwork rights or copyrights on certain of the
Company's products and processes.  None of the claims to date has resulted in
the commencement of any litigation against the Company nor has the Company to
date believed it is necessary to license any of the patent rights referred to in
such letters.

BACKLOG

  Vitesse's sales are made primarily pursuant to standard purchase orders for
delivery of products.  Quantities of the company's products to be delivered and
delivery schedules are frequently revised to reflect changes in customer needs.
For these reasons, the Company's backlog as of any particular date is not
representative of actual sales for any succeeding period and the Company
therefore believes that backlog is not a good indicator of future revenue. The
Company's backlog scheduled to be shipped in the next six months was
$103,000,000 on September 30, 1998, compared to $62,000,000 on September 30,
1997.

ENVIRONMENTAL MATTERS

  The Company is subject to a variety of federal, state and local governmental
regulations related to the use, storage, discharge and disposal of toxic,
volatile or otherwise hazardous chemicals used in its manufacturing process.
Any failure to comply with present or future regulations could result in the
imposition of fines on the

                                       8
<PAGE>
 
Company, the suspension of production or a cessation of operations. In addition,
such regulations could restrict the Company's ability to expand its facilities
at its present location or operate its manufacturing facility in Colorado
Springs, Colorado, or could require the Company to acquire costly equipment or
incur other significant expenses to comply with environmental regulations or
clean up prior discharges.

EMPLOYEES

  As of September 30, 1998, the Company had 590 employees, including 222 in
engineering, research and development, 46 in marketing and sales, 299 in
operations and 23 in finance and administration.  The Company's ability to
attract and retain qualified personnel is essential to its continued success.
None of the Company's employees is represented by a collective bargaining
agreement, nor has the Company ever experienced any work stoppage.  The Company
believes its employee relations are good.


ITEM 2.  PROPERTIES

  The Company's executive offices and principal research and development and
fabrication facility is located in Camarillo, California, and is being leased
under a noncancellable operating lease that expires in 1999.  The total space
occupied in this building is approximately 80,000 square feet.  The Company has
a second wafer fabrication facility in Colorado Springs, Colorado that is being
leased under a synthetic lease that expires in 2001.  The Company has the option
to purchase this facility at cost at the end of the lease term.  The Company
leases an additional 10,000 square feet in Camarillo for product development and
8,000 square feet in Santa Clara, California for a product development and sales
office.  The Company's Colorado Springs, Colorado facility is in a 100,000
square foot building that is being occupied on a five-year operating lease with
a purchase option at the end of the lease.  This facility includes a 10,000
square foot clean room for wafer fabrication, and a product development center.
The Company also leases space for three other product development centers in
Portland, Oregon and Dallas, Texas, and Melbourne, Florida and 15 sales and
field application support offices (12 in the United States, two in Europe and
one in Japan).


ITEM 3.  LEGAL PROCEEDINGS

  The Company is currently involved in several legal proceedings; however, it
believes that none of them would have a material or adverse affect on the
Company.
 

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

  No matters were submitted to a vote of the Company's shareholders during the
last quarter of the fiscal year ended September 30, 1998.

                                       9
<PAGE>
 
                                    PART II
                                        

ITEM 5.  MARKET FOR COMPANY'S COMMON STOCK AND RELATED STOCKHOLDER MATTERS

  The information required by this item which appears on page 11 of the
Company's 1998 Annual Report to Shareholders is incorporated herein by
reference.


ITEM 6.  SELECTED FINANCIAL DATA

  The selected financial data for each of the five years ended September 30,
1998, which appears on page 10 of the Company's 1998 Annual Report to
Shareholders is incorporated herein by reference.


ITEM 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS

  The information required by this item which appears on pages 12 to 20 of the
Company's 1998 Annual Report to Shareholders is incorporated herein by
reference.


ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

  Information required by this item is included in pages 22 to 36 of the
Company's 1998 Annual Report to Shareholders, and is incorporated herein by
reference.


Item 9.  Changes in and Disagreements with Accountants on Accounting and
         Financial Disclosure

  None.

                                       10
<PAGE>
 
                                    PART III


ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

  The directors and executive officers of the Company are as follows:
<TABLE>
<CAPTION>
     Name                        Age   Position
     ----                        ---   --------
     <C>                         <C>   <S>
     Louis R. Tomasetta           49   President and Chief Executive Officer, Director
     Ian Burrows                  44   Vice President, Wafer Fab
     Robert J. Cutter             43   Vice President & General Manager, Colorado Springs
     Ira Deyhimy                  58   Vice President, Product Development
     Christopher R. Gardner       38   Vice President & General Manager, ATE
     Eugene F. Hovanec            46   Vice President, Finance & Chief Financial Officer
     Jeanne Johnson               57   Vice President, Human Resources
     James Mikkelson              50   Vice President, Technology Devel., Chief Technical Officer
     Michael Millhollan           54   Vice President & General Manager, Data Communications
     Robert Nunn                  37   Vice President & General Manager, Telecommunications
     Neil Rappaport               52   Vice President, Sales
     Ram Venkataraman             58   Vice President, Quality
     James A. Cole                56   Director
     Alex Daly                    37   Director
     Pierre R. Lamond             68   Chairman of the Board
     John C. Lewis                63   Director
</TABLE>

  Louis R. Tomasetta, a co-founder of the Company, has been President, Chief
Executive Officer and a Director since the Company's inception in February 1987.
From 1984 to 1987, he served as President of the integrated circuits division of
Vitesse Electronics Corporation.  Prior to that, Dr. Tomasetta was the director
of the Advanced Technology Implementation department at Rockwell International
Corporation.  Dr. Tomasetta has over 25 years experience in the management and
development of GaAs based businesses, products, and technology.  He received
B.S., M.S., and Ph.D. degrees in electrical engineering from the Massachusetts
Institute of Technology.

  Ian Burrows joined the Company in February 1987 as a Process Engineering
Manager, became Director of Wafer Fabrication in December 1990, and Vice
President of Wafer Fabrication Operations in April 1995.  Prior to that, he held
the position of process engineering development manager at Honeywell's GaAs
product center and development process engineer at Mostek.  Dr. Burrows received
a B.S. in electrical engineering from Warwick University, England, and M.S. and
Ph.D. degrees in electrical engineering from Texas Tech University.

  Robert J. Cutter joined the Company in October 1996 as Vice President &
General Manager of the Colorado Springs facility.  Prior to that, Mr. Cutter was
Plant Manager, Colorado Springs, for Rockwell Semiconductor Systems.  From 1990
to 1995, he was Director of Operations for United Technologies Microelectronics
Center.  From 1981 to 1988, he held a variety of management positions at Inmos
Corporation.  Mr. Cutter graduated from University of Southhampton, United
Kingdom, with a First Class Honors Degree in Aeronautics & Astronautics.

  Ira Deyhimy, a co-founder of the Company, has been Vice President of Product
Development since the Company's inception in February 1987.  From 1984 to 1987
he was Vice President, Engineering at Vitesse Electronics Corporation.  Prior to
that, Mr. Deyhimy was manager of Integrated Circuit Engineering at Rockwell
International Corporation.  He has over 25 years of experience in GaAs
electronics.  Mr. Deyhimy received a B.S. degree in physics from the University
of California at Los Angeles and an M.S. degree in physics from California State
University at Northridge.

  Christopher R. Gardner joined the Company in February 1987 and held various
engineering and engineering management positions through September 1996 when he
became Vice President & General Manager, ATE.  Prior to that, Mr. Gardner was a
member of technical staff at AT&T Bell Laboratories.  Mr. Gardner holds a B.S.
degree in electrical engineering from Cornell University and an M.S. degree in
electrical engineering from the University of California at Berkeley.

                                       11
<PAGE>
 
  Eugene F. Hovanec joined the Company as Vice President, Finance and Chief
Financial Officer in December 1993.  From 1989 to 1993, Mr. Hovanec served as
Vice President, Finance & Administration, and Chief Financial Officer at Digital
Sound Corporation.  Prior to that, from 1984 to 1989, he served as Vice
President and Controller at Micropolis Corporation. Mr. Hovanec holds a Bachelor
of Business Administration degree from Pace University, New York.  Mr. Hovanec
also serves as a Director of Interlink Electronics, Inc.

  Jeanne Johnson joined the Company in August 1987 as Director, Human Resources
and became Vice President, Human Resources in September 1997.  From January 1984
to August 1987, Ms. Johnson was a human resources consultant in the areas of
compensation, benefits and training.  Her human resources management experience
also includes two years as Director of Human Resources for IBIS Systems, Inc.
and eight years as Employee Relations Manager for Borg-Warner Corporation.  Ms.
Johnson has a B.A. degree from the University of California, Santa Barbara.

  James Mikkelson, a co-founder of the Company, became Chief Technical Officer
in September 1997. He has served as Vice President of Technology Development
since the Company's inception in February 1987.  From 1984 to 1987, he served as
Vice President, Operations at Vitesse Electronics Corporation.  Prior to that,
he served as Project Manager at Hewlett-Packard Company, responsible for the
development and manufacturing of MOS VLSI circuits.  Mr. Mikkelson holds B.S.
and M.S. degrees in electrical engineering from the Massachusetts Institute of
Technology.

  Michael Millhollan joined the Company in July 1989 as Director of the
Sunnyvale Product Development Center and became Vice President and General
Manager of Standard Products in October 1992.  From 1976 to 1989, he held
various senior design engineering positions with National Semiconductor
Corporation, a semi-conductor manufacturer, most recently as Director of
programmable logic product development.  Prior to that, he was at Motorola,
Inc., a semiconductor manufacturer, for seven years in various design
engineering positions.  Mr. Millhollan holds a B.S. degree in electrical
engineering from the Georgia Institute of Technology.

  Robert Nunn joined the Company in July 1989, became Director of Marketing in
January 1991 and Vice President and General Manager of ASIC Products in July
1992.  From August 1987 to July 1989 he served as product marketing manager at
Advanced Micro Devices, Inc. ("AMD"), a semiconductor manufacturer, where he
managed a staff focusing on international markets.  From March 1986 to August
1987 Mr. Nunn held various marketing positions at Monolithic Memories, Inc.
("MMI") in their Semi-custom Products and Programmable Products Divisions before
MMI merged with AMD in 1987.  Mr. Nunn holds a B.S. degree in computer
engineering from the University of California at Los Angeles and an M.B.A. from
Harvard Business School.

  Neil Rappaport joined the Company as Vice President, Sales in August 1987.
From September 1982 to 1987, Mr. Rappaport was national sales manager with
Applied Micro Circuits Corporation, a manufacturer of ECL integrated circuits.
Prior to that, he held various sales positions with Signetics Corporation, a
semiconductor manufacturer.  Prior to that, he was a design engineer at Hughes
Aircraft Company.  Mr. Rappaport has a B.S. degree from Fairleigh Dickinson
University and an A.S. degree in electronics technology from the RCA Institute.

  Ram Venkataraman joined the Company as Director of Quality in January 1990 and
in August 1990 he became Vice President, Quality.  From November 1984 to January
1990, he held various positions, including manager of reliability and quality
assurance and Director of Wafer Fabrication Operations, at GigaBit Logic, Inc.,
a gallium arsenide semiconductor manufacturer.  Mr. Venkataraman has over 20
years of experience in IC quality assurance and reliability spanning both
silicon and GaAs technologies.  Mr. Venkataraman holds B.S. degrees in physics
and electrical engineering from Madras University, India, and an M.S. degree in
electrical engineering from the Indian Institute of Technology, India.

  James A. Cole has served as a Director of the Company since February 1987.  He
has been a General Partner of Windward Ventures since 1997 and he has been a
General Partner of Spectra Enterprise Associates since 1986.  He was a founder
and Executive Vice President of Amplica, Inc., a GaAs microwave IC and sub-
system company.  Mr. Cole also serves as a Director of Giga-Tronics, Inc. and
Spectrian Corporation.

                                       12
<PAGE>
 
   Alex Daly became a Director of the Company in January 1998.  He has been
President and Chief Executive Officer of Cygnus Solutions, a developer of
software tools, since February 1998.  From 1995 to 1998 he served as Vice
President of Marketing at C-Cube Microsystems, a developer of digital video
communications products.  From 1990 to 1995, he served at Intel Corporation, a
semiconductor company, most recently as director of marketing for the mobile
computing group.

  Pierre R. Lamond has been the Chairman of the Board of Directors since the
Company's inception in February 1987.  Since August 1981, he has been a General
Partner of Sequoia Capital, a venture capital firm.  Sequoia has financed
companies such as Cypress Semiconductor Corporation, Cisco, and C-Cube
Microsystems.  Mr. Lamond was founder and Vice President of National
Semiconductor Corporation.  He is also a Director of CKS Group and CombiChem.

  John C. Lewis became a Director of the Company in January 1990.  He is
currently Chairman of the Board of Directors of Amdahl Corporation, a
manufacturer of large general purpose computer storage systems and software
products.  Before joining Amdahl in 1977, he was President of Xerox Business
Systems.  Mr. Lewis also serves as a Director of Cypress Semiconductor
Corporation and Pinnacle Systems.


Item 11.  Executive Compensation

  This item is answered by reference to the information set forth under the
captions "Executive Compensation," "Stock Option Plans," "1991 Employee Stock
Purchase Plan," "401(k) Plan" and "Certain Transactions" in the Company's Proxy
Statement for the 1999 Annual Meeting of Shareholders to be filed with the
Commission on or before December 31, 1998.


ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

  This item is answered by reference to the information set forth under the
caption "Principal Share Ownership" in the Company's Proxy Statement for the
1999 Annual Meeting of Shareholders to be filed with the Commission on or before
December 31, 1998.


ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

  This item is answered by reference to the information set forth under the
caption "Certain Transactions" in the Company's Proxy Statement for the 1999
Annual Meeting of Shareholders to be filed with the Commission on or before
December 31, 1998.

                                       13
<PAGE>
 
                                    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>
                                                                                                                       Page in
                                                                                                                       -------
   1. Financial Statements:                                                                                         Annual Report
                                                                                                                    -------------
      <S>                                                                                                           <C> 
      The financial statements of the Company listed below are incorporated herein by reference
      to the following pages of the 1998 Annual Report to Shareholders:
 
      Independent Auditors' Report                                                                                        21
      Consolidated Balance Sheets as of September 30, 1998 and 1997                                                       22
      Consolidated Statements of Operations for the years ended September 30, 1998,
        1997 and 1996                                                                                                     23
      Consolidated Statements of Shareholders' Equity for the years ended September 30,
        1998, 1997 and 1996                                                                                               24
      Consolidated Statements of Cash Flows for the years ended September 30, 1998, 1997
        and 1996                                                                                                          25
      Notes to Consolidated Financial Statements                                                                          26
 
   2. Consolidated Financial Statement Schedules:                                                                        Page
                                                                                                                         ----
      The Consolidated financial statement schedules of the Company  are included in Part IV
        Of this report on the pages indicated:
 
      Independent Auditors' Report on Consolidated Financial Statement Schedule                                           17
 
      For the three fiscal years ended September 30, 1998--
        II -- Valuation and Qualifying Accounts                                                                           18
</TABLE>
      All other schedules are omitted because they are not applicable or are not
required.

   3.    Exhibits:

      See Item 14(c) below.

  (b)  Reports on Form 8-K

      No reports on Form 8-K were filed during the last quarter of the fiscal
      year ended September 30, 1998.

  (c)  Exhibits

      The exhibits listed on the accompanying index immediately following the
      signature page are filed As part of this report.

  (d)  Financial Statement Schedules

      See Item 14(a) above.

                                       14
<PAGE>
 
                                   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.


                                            VITESSE SEMICONDUCTOR CORPORATION


Date:  December 22, 1998                    By: /s/ Eugene F. Hovanec
                                                ---------------------
                                                    Eugene F. Hovanec
                                                  Vice President, Finance
                                                 & Chief Financial Officer


   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.



          Signature                      Title                     Date
          ---------                      -----                     ----


    /s/ Louis R. Tomasetta    President and Chief Executive    December 22, 1998
    ----------------------    Officer (Principal Executive 
        Louis R. Tomasetta    Officer)    



    /s/ Eugene F. Hovanec     Vice President, Finance and      December 22, 1998
    ----------------------    Chief Financial Officer
        Eugene F. Hovanec       
 


    /s/ James A. Cole         Director                         December 22, 1998
    ----------------------                                                    
        James A. Cole



    /s/ Alex Daly             Director                         December 22, 1998
    ----------------------
        Alex Daly



    /s/ Pierre R. Lamond      Chairman of the Board            December 22, 1998
    ----------------------    of Directors  
        Pierre R. Lamond



    /s/ John C. Lewis         Director                         December 22, 1998
    ----------------------                                                    
        John C. Lewis

                                       15
<PAGE>
 
ITEM 16  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

 (a)  Exhibits
<TABLE> 
<CAPTION> 
 Exhibit Number
 --------------
 <C>              <S> 
     3.1/1/       Certificate of Incorporation of Registrant, as amended to date.
     3.2/2/       Bylaws of Registrant as amended to date.
     4.1/2/       Specimen of Company's Common Stock Certificate.
    10.1/2/       1989 Stock Option Plan.
    10.2/2/       1991 Stock Option Plan.
    10.3/2/       1991 Employee Stock Purchase Plan.
    10.4/2/       1991 Directors' Stock Option Plan.
    10.5/2/       Standard Form of Indemnification Agreement between Registrant and its officers and directors.
    10.6/2//3/    Loan and Security Agreement dated May 8, 1991 between Silicon Valley Bank and Registrant.
    10.7/1/       Amendment to Loan Agreement dated December 28, 1992 between Silicon Valley Bank and Registrant.
    10.8/5/       Amendment to Loan Agreement dated June 14, 1993 between Silicon Valley Bank and Registrant.
    10.9/1/       First Amendment to Lease between Carson Estate Company (formerly Victoria Partnership) and Registrant.
    10.10/2/      Lease dated January 31, 1991 between Camarillo I Development Corporation and Registrant.
    10.11/2/      Standard Form Proprietary Information Agreement.
    10.12/4/      Amendment dated March 23, 1994, to the Loan Agreement dated May 8, 1991, as amended, by and between
                  Silicon Valley Bank and Registrant.
    10.13/5/      Amendment dated December 13, 1994, to the Loan Agreement dated May 8, 1991, as amended, by and between
                  Silicon Valley Bank and Registrant.
    10.14/6/      Amendment dated January 2, 1996, to the Loan Agreement dated May 8, 1991, as amended, by and between
                  Silicon Valley Bank and Registrant.
    10.15/7/      Amendment dated January 22, 1997, to the Loan Agreement dated May 8, 1991, as amended, by and between
                  Silicon Valley Bank and Registrant.
    10.16/7/      Agreement dated October 30, 1996 between ABN AMRO Bank N.V., Lease Plan North America, Inc. and Registrant.
    10.17/7/      Agreement dated August 15, 1997 between ABN AMRO Bank N.V., Lease Plan North America, Inc. and Registrant.
    10.18         Loan modification agreement dated October 10, 1997, to the Loan Agreement dated May 8, 1991, as amended,
                  by and between Silicon Valley Bank and Registrant.
    10.19         Amendment dated January 6, 1998, to the Loan Agreement dated May 8, 1991, as amended, by and between
                  Silicon Valley Bank and Registrant.
    10.20         Agreement dated July 9, 1998 between Metlife Capital Corporation and Registrant.
    13.1          Annual Report to Security Holders
    23.1          Report on Schedule and Consent of Independent Certified Public Accountants.
    27.1          Financial Data Schedule
</TABLE>

(1)  Incorporated by reference from the Company's annual report on Form 10-K for
     the period ended September 30, 1992.
(2)  Incorporated by reference from the Company's registration statement on Form
     S-1 (File no. 33-43548), effective December 10, 1991.
(3)  Confidential treatment previously granted as to certain portions of these
     exhibits.
(4)  Incorporated by reference from the Company's quarterly report on Form 10Q
     for the period ended March 30, 1994.
(5)  Incorporated by reference from the Company's annual report on Form 10-K for
     the period ended September 30, 1995.
(6)  Incorporated by reference from the Company's annual report on Form 10-K for
     the period ended September 30, 1996.
(7)  Incorporated by reference from the Company's annual report on Form 10-K for
     the period ended September 30, 1997.

                                       16
<PAGE>
 
                         Independent Auditors' Report
                         -----------------------------


The Board of Directors
Vitesse Semiconductor Corporation:

Under date of October 14, 1998, we reported on the consolidated balance sheets
Vitesse Semiconductor Corporation and subsidiaries as of September 30, 1998 and
1997, and the related consolidated statements of operations, shareholders'
equity, and cash flows for each of the years in the three-year period ended
September 30, 1998, as contained in the 1998 annual report to shareholders.
These consolidated financial statements and our report thereon are incorporated
by reference in the annual report on Form 10-K for the year 1998.  In connection
with our audits of the aforementioned consolidated financial statements, we also
audited the related consolidated financial statement schedule as listed in the
accompanying index.  This financial statement schedule is the responsibility of
the Company's management.  Our responsibility is to express an opinion on this
financial statement schedule based on our audits.

In our opinion, such financial statement schedule, when considered in relation
to the basic consolidated financial statements taken as a whole, presents
fairly, in all material respects, the information set forth therein.

                                                  (signed) KPMG PEAT MARWICK LLP

Los Angeles, California
October 14, 1998

                                      17
<PAGE>
 
                       VITESSE SEMICONDUCTOR CORPORATION
                SCHEDULE II -- Valuation and Qualifying Accounts
                 Years ended September 30, 1998, 1997 and 1996
                                 (in thousands)

<TABLE>
<CAPTION>
                                           Balance at    Charged to                  Balance
                                          Beginning of   Costs and    Deductions/    at end
                                             Period      Expenses     Write-offs    of Period
                                          ------------   ----------   -----------   ---------
<S>                                       <C>            <C>          <C>           <C>
 
Year ended September 30, 1998
  Deducted from Inventories:
     Reserve for obsolescence                   $3,121       $1,034           ---      $4,155
  Deducted from Accounts Receivable:
     Allowance for doubtful accounts             1,000          790           790       1,000
 
Year ended September 30, 1997
  Deducted from Inventories:
     Reserve for obsolescence                    2,797        1,988         1,664       3,121
  Deducted from Accounts Receivable:
     Allowance for doubtful accounts               900          500           400       1,000
 
Year ended September 30, 1996
  Deducted from Inventories:
     Reserve for obsolescence                    2,493        1,347         1,043       2,797
  Deducted from Accounts Receivable:
     Allowance for doubtful accounts               700          200           ---         900
 </TABLE>

                                       18

<PAGE>

                                                                   EXHIBIT 10.18

                          LOAN MODIFICATION AGREEMENT

     This Loan Modification Agreement is entered into as of October 10, 1997, by
and between Vitesse Semiconductor Corporation ("Borrower") and Silicon Valley
Bank ("Silicon").

1.   DESCRIPTION OF EXISTING INDEBTEDNESS: Among other indebtedness which may be
     ------------------------------------
owing by Borrower to Silicon, Borrower is indebted to Silicon pursuant to, among
other documents, a Loan and Security Agreement dated May 8, 1991, as may be
amended, together with all Schedules thereto (the "Loan Agreement"). The Loan
Agreement provides for, among other things a Credit Limit in the amount of
Twelve Million Five Hundred Thousand and 00/100 Dollars ($12,500,000.00).
Defined terms used but not otherwise defined herein shall have the same meanings
as in the Loan Agreement.

Hereinafter, all indebtedness owing by Borrower to Silicon shall be referred to
as the "Indebtedness". Hereinafter, other documents evidencing the Indebtedness
shall be referred to as the "Existing Loan Documents".

3.   DESCRIPTION OF CHANGE IN TERMS.
     ------------------------------

     A.      MODIFICATION(S) TO LOAN AGREEMENT.
             ---------------------------------

             1. The following paragraph is hereby incorporated into the Loan
Agreement:

                DIRECT DEPOSIT RESERVE. A maximum of $247,500.00 (the "Direct
                ----------------------
                Deposit Reserve") shall be reserved under Borrower's Credit
                Limit for the purpose of supporting daylight overdrafts, from
                time to time, created by the issuance of checks or other debits
                in connection with the direct deposit of payroll for Vitesse
                Manufacturing & Development Corporation in the amount of
                $90,000.00 and Vitesse Semiconductor Sales Corp, in the amount
                of $157,500.00, Borrower's subsidiaries. In the event an
                overdraft remains uncured as result of such direct deposit
                activities, Borrower agrees that in such amounts shall become
                Borrower's Obligations under Borrower's line of credit facility
                and shall bear interest at the interest rate thereon until paid
                in full. Such Direct Deposit Reserve shall at all times be
                reserved under Borrower's Credit Limit.

4.   CONSISTENT CHANGES. The Existing Loan Documents are hereby amended wherever
     ------------------
necessary to reflect the changes described above.

5.   NO DEFENSES OF BORROWER. Borrower (and each guarantor and pledgor signing
     -----------------------
below) agrees that it has no defenses against the obligations to pay any amounts
under the Indebtedness.

6.   CONTINUING VALIDITY. Borrower (and each guarantor and pledgor signing
     -------------------
below) understands and agrees that in modifying the existing Indebtedness,
Silicon is relying upon Borrower's representations, warranties, and agreements,
as set forth in the Existing Loan Documents. Except as expressly modified
pursuant to this Loan Modification Agreement, the terms of the Existing Loan
Documents remain unchanged and in full force and effect. Silicon's agreement to
modifications to the existing Indebtedness pursuant to this Loan Modification
Agreement in no way shall obligate Silicon to make any future modifications to
the Indebtedness. Nothing in this Loan Modification Agreement shall constitute a
satisfaction of the Indebtedness. It is the intention of Silicon and Borrower to
retain as liable parties all makers and endorsers of Existing Loan Documents,
unless the party is expressly released by Silicon in writing. No maker,
endorser, or guarantor will be released by virtue of this Loan Modification
Agreement. The terms of this paragraph apply not only to this Loan Modification
Agreement, but also to all subsequent loan modification agreements.

                                       1
<PAGE>

This Loan Modification Agreement is executed as of the date first written above.

BORROWER:                                       SILICON:

VITESSE SEMICONDUCTOR CORPORATION               SILICON VALLEY BANK


By: /s/ Eugene Hovanec                          By:_____________________________
   ---------------------------
Name:   Eugene Hovanec                          Name:___________________________
     -------------------------
Title:  Vice President                          Title:__________________________
      ------------------------

Acknowledged and agreed:


VITESSE MANUFACTURING
& DEVELOPMENT CORPORATION


By: /s/ Eugene Hovanec
   -----------------------------
Name:   Eugene Hovanec
     ---------------------------
Title:  Secretary
      --------------------------



VITESSE SEMICONDUCTOR SALES CORP.

By: /s/ Eugene Hovanec
   -----------------------------
Name:   Eugene Hovanec
     ---------------------------
Title:  Secretary
      --------------------------

                                       2



<PAGE>
 
                                                                   EXHIBIT 10.19

[LOGO SILICON VALLEY BANK APPEARS HERE]

                          AMENDMENT TO LOAN AGREEMENT

 BORROWER:                  VITESSE SEMICONDUCTOR CORPORATION
 ADDRESS:                   741 CALLE PLANO
                            CAMARILLO, CALIFORNIA 93012

 DATED AS OF:               JANUARY 6, 1998

THIS AMENDMENT TO LOAN AGREEMENT is entered into between SILICON VALLEY BANK
("Silicon") and the borrower named above (the "Borrower").

     The Parties agree to amend the Loan and Security Agreement between them
dated May 8, 1991, as amended by that Amendment to Loan Agreement dated May 8,
1991, as amended by that Amendment to Loan Agreement dated August 12, 1992, as
amended by that Amendment to Loan Agreement dated December 28, 1992, as amended
by that Amendment to Loan Agreement dated June 14, 1993, as amended by that
Amendment to Loan Agreement dated December 10, 1993, as amended by that
Amendment to Loan Agreement dated March 23, 1994, as amended by that Amendment
to Loan Agreement dated December 13, 1994, as amended by that Amendment to Loan
Agreement dated January 2, 1996, and as amended by that Amendment to Loan
Agreement dated January 22, 1997 (as so amended and as otherwise amended or
modified from time to time, the "Loan Agreement"; unless otherwise defined
herein, terms defined in the Loan Agreement are used herein as therein defined),
as follows, effective as of the date of hereof:

     1.   NEW MATURITY DATE. The Maturity Date set forth in Section 5.1 of
the Schedule to the Loan Agreement is hereby amended to be "January 5, 1999".

     2.   FEE. Borrower shall concurrently herewith pay to Silicon a fee in the
amount of $12.500, which shall be in addition to all interest and to all other
amounts payable hereunder, and which shall not be refundable.

     3.   REPRESENTATIONS TRUE. The Borrower represents and warrants to Silicon
that all representations and warranties set forth in the Loan Agreement, as
amended hereby, are true and correct.

     4.   GENERAL PROVISIONS. This Amendment, the Loan Agreement, any prior
written amendments to the Loan Agreement signed by Silicon and the Borrower, and
the other written documents and agreements between Silicon and the Borrower set
forth in full all of the representations and agreements of the parties with
respect to the subject matter hereof and supersede all prior discussions,
representations, agreements and understandings between the

                                       -1-



                                         

<PAGE>

parties with respect to the subject hereof. Except as herein expressly amended,
all of the terms and provisions of the Loan Agreement, and all other documents
and agreements between Silicon and the Borrower shall continue in full force and
effect and the same are hereby ratified and confirmed.


   
   Borrower:                                      Silicon:

   VITESSE SEMICONDUCTOR                          SILICON VALLEY BANK 
   CORPORATION

   By /s/ Eugene Hovanec                          By /s/ James C. Carrington
     ----------------------                         -------------------------
       Vice President                             Title Senior Vice President
                                                       ----------------------
   By /s/ Yatin Mody
     -----------------------
       Asst's Secretary

                                      -2-

                                                            



<PAGE>
 
                                                                   EXHIBIT 10.20

                        MASTER LEASE PURCHASE AGREEMENT

         THIS AGREEMENT is entered into the 9/th/ day of July, 1998 between
METLIFE CAPITAL CORPORATION ("Lessor") whose address is 10900 N.E. 4th Street,
Suite 500, mailing address C-97550, Bellevue, Washington 98009 and VITESSE
MANUFACTURING & DEVELOPMENT CORPORATION, a wholly owned subsidiary of Vitesse
Semiconductor Corporation ("Lessee") whose address is 741 Calle Plano,
Camarillo, CA 93012.

Lessor and Lessee from time to time may enter into written agreements in the
form of "Lease Purchase Addenda" for the leasing of equipment by Lessor to
Lessee. To facilitate such transactions, Lessor and Lessee are entering into
this Master Lease Purchase Agreement (the "Master Lease"), the terms and
provisions of which shall be incorporated by reference in each such Lease
Purchase Addendum, and they MUTUALLY AGREE AS FOLLOWS:

1.   LEASE PURCHASE ADDENDUM
     -----------------------
If Lessor agrees to lease equipment when requested by Lessee, the parties shall
sign a Lease Purchase Addendum ("Addendum") setting forth the particulars
regarding the transaction, including, without limitation, the list of items of
equipment (individually, an "Item" and, collectively, the "Equipment"), the
prices of each Item (including disclosure of all rebates, discounts and other
incentives received or receivable with respect thereto), "Related Costs",
including taxes, transportation, installation and other applicable costs, the
aggregate of the foregoing ("Total Cost"), length of the Basic Term, rental
rates, purchase and renewal options, if any, and other applicable provisions.
"Cost of an Item" shall mean the price of the Item plus its applicable portion
of Related Costs. In the absence of a signed Addendum, this Master Lease shall
not constitute a lease or a commitment by either party to enter into a lease.

2.   REQUEST TO LEASE; EQUIPMENT ACCEPTANCE
     --------------------------------------

     (A)  Request; Specifications. Signing an Addendum shall constitute the
          -----------------------          
request from Lessee to Lessor to lease the Equipment, and the Addendum and this
Master Lease shall constitute the lease and agreement (the "Lease") regarding
the Equipment. As security for all obligations of Lessee to Lessor now existing
or hereafter arising under this Lease, Lessee grants Lessor a security interest
in all Equipment. At the time of signing the Addendum, Lessee shall furnish
Lessor detailed specifications ("Specifications") of the Items, including
descriptions, prices, delivery terms and instructions, installation provisions
and all other applicable specifications. Lessee assumes full responsibility with
respect to the selection of Items supplied for lease and the specification
thereof; the Lessor shall have no liability or responsibility with respect
thereto regardless of whether the Specifications prove inadequate for the
intended purpose or use.

     (B)  Inspection; Acceptance. It is Lessee's responsibility to receive and
          ----------------------
promptly inspect and test each Item tendered for delivery by a supplier and the
installation thereof. Lessee shall give Lessor written notice of acceptance of
an Item as soon as it can be determined that the Item and its installation are
in compliance with Specifications. As between Lessee and Lessor, the giving of
such written notice shall constitute Lessee's irrevocable acceptance of the Item
or Items designated in the notice, whether or not such Items or their
installation are defective in any respect, and notwithstanding any failure of an
Item or its installation to conform to Specifications, without prejudice however
to rights which Lessor and Lessee, or either of them, may have against any other
person, whether with respect to design, manufacture, condition or otherwise.

     (C)  Purchase Cut-Off Date. If, by the "Purchase Cut-Off Date" set forth in
          ---------------------
an Addendum, Lessee shall not have given Lessor written notice of acceptance of
an Item, Lessor shall have no obligation to lease the Item to Lessee. In such
event, Lessee shall immediately pay all accrued Interim Rental and reimburse
Lessor for all sums Lessor may have paid for or with respect to the Item and for
all Lessor's costs and expenses with respect thereto, and Lessee shall indemnify
and defend Lessor against and hold Lessor harmless from any and all cost,
expense, loss, liability and damage that Lessor may suffer or that may be
asserted against Lessor by reason of Lessor's failure or refusal to lease such
Item. Any such Item shall be deemed to be deleted from the Addendum and no
longer included in the Equipment.

                                    Page 1

<PAGE>

       (D) Conditions Precedent. Lessee shall deliver to Lessor such further
           --------------------
instruments, documents and certifications as Lessor reasonably may request,
including without limitation evidences of authority (e.g., corporate
certificates, corporate resolutions, partnership documents and authorizations),
evidence of insurance, purchase orders and acceptances thereof, purchase and
sale agreements and public financial information, and instruments and documents
to implement, perfect or continue the perfection of Lessor's rights and remedies
as Lessor of the Equipment, including Uniform Commercial Code forms. Lessee's
delivery of the foregoing and of the Specifications are conditions precedent to
any obligation of Lessor to make any commitments to pay for the Equipment or any
Item.

       (E) Supplemental Lease Request. If at any time prior to the Closing Date
           --------------------------
Lessee requests Lessor to add further Items to the Equipment, and if Lessor so
agrees, Lessee shall execute a Lease Purchase Addendum Supplement in a form
supplied by Lessor, which shall become part of the Addendum, subject to all of
its provisions and the provisions of this Master Lease, and the equipment
specified therein shall be Items of Equipment under the Lease.

       (F) Closing. Following the date ("Closing Date") which is the earlier of
           -------
(i) the date Lessee gives Lessor written notice of acceptance of the last Item
or (ii) the Purchase Cut-Off Date (or on such other day as is mutually agreed),
Lessor shall send Lessee a Closing Schedule ("Schedule"), setting forth any
adjustments to descriptions and Costs of Items and Total Cost and confirming the
Closing Date, amount of Periodic Rental installments, payment schedules, and
insurance requirements. Lessee's signature on any such Schedule shall signify
the Lessee's agreement that the Schedule is correct. Notwithstanding any
discrepancies or disagreements between Lessor and Lessee regarding the
Schedules, Lessee shall pay all rentals as they become due in accordance with
the terms and conditions of the Lease. If Lessee establishes an error that
affects the amount of rentals, Lessor shall give Lessee a credit for any
overpayment of rentals, and Lessee promptly shall pay Lessor any underpayments.
The Schedules are incorporated herein by reference.

 3.    LESSEE'S WARRANTIES
       ------------------- 

       (A) Lessee represents and warrants to Lessor that it is a corporation or
partnership duly organized, validly existing and in good standing under the laws
of the jurisdiction of its organization and that it is qualified to do business
in every jurisdiction where the failure to qualify would have a materially
adverse effect on Lessor's rights hereunder; it has taken all corporate or
partnership action which may be required to authorize the execution, delivery
and performance of this Lease, and such execution, delivery and performance will
not conflict with or violate any provision of its Charter or Articles or
Certificate of Incorporation, By-laws or any provisions thereof, or in the case
of a partnership, its Certificate of Partnership or Limited Partnership and its
Partnership Agreement, or result in a default or acceleration of any obligation
under any agreement, order, decree or judgment to which it is a party or by
which it is bound, nor is it now in default under any of the same; there is no
litigation or proceeding pending or threatened against it which may have a
materially adverse effect on Lessee or which would prevent or hinder the
performance by it of its obligations hereunder; this Lease and the attendant
documents constitute valid obligations of the Lessee, binding and enforceable
against it in accordance with their respective terms; no action by or with any
commission or administrative agency is required in connection herewith; it has
the power to own its assets and to transact business in which it is engaged; it
will give to Lessor prompt notice of any change in its name, identity or
structure.

       (B) Lessee's written acceptance of an Item and its installation shall
constitute a REPRESENTATION AND WARRANTY BY Lessee to Lessor that: (i) the Item
is personal property in good order and condition; (ii) the Item conforms to
Specifications; (iii) unless otherwise specified, the Item has not been placed
into commercial service by the Lessee for more than ninety (90) days prior to
its acceptance by Lessee; and (iv) at all times Lessee shall keep the Equipment
in Lessee's possession at the address specified in the Addendum unless Lessor
shall otherwise consent in writing. Lessee shall not cause, suffer or permit any
Item to be attached or affixed to real property or improvements thereon
(collectively, "Realty") unless Lessor
                             
                                    Page 2
<PAGE>

first shall consent thereto in writing and Lessee shall have obtained from all
persons having any interest in the Realty written consents which approve such
attachment, waive any claims to or encumbrances upon attached Items and consent
to the detachment and removal of such Items at any time by Lessor or Lessee.
Notwithstanding attachment of any Items to Realty, all the Equipment at all
times shall be and remain personal property. Upon termination of Lessee's right
to possession of the Equipment, whether by expiration of the Term or otherwise,
Lessee at its sole cost and expense shall detach and remove the Equipment from
the Realty and save Lessor harmless from and indemnify and defend Lessor against
any claim, demand, loss, liability, and damage arising from such detachment or
removal, or both.

4.    TERM OF LEASE
      -------------
The Term of the Lease ("Term") may consist of an "Interim Term" and a "Basic
Term." The Interim Term shall begin on the date that Lessee first gives Lessor
written notice of acceptance of an Item or written approval for partial payment,
whichever is earlier, and shall continue until the time the Basic Term begins.
The Basic Term shall begin on the Closing Date and shall continue for the length
of the Basic Term set forth in the Addendum.

5.    INTERIM RENTAL
      --------------    
During the Interim Term, if any, Lessee shall pay rent monthly ("Interim
Rental"), on a calendar month basis, in an amount determined by Lessor by
applying the "Interim Rental Rate" set forth in the Addendum to portions of the
Total Cost then or theretofore expended by Lessor, for the number of days such
sums are outstanding during such calendar month. The "prime rate" referred to in
this Lease shall mean the rate per annum publicly announced by Chase Manhattan
Bank, New York City, from time to time as its prime rate, whether or not such
rate is applied by said bank to any then outstanding loans, changing with each
announced change of such prime rate. Lessee shall pay Lessor each installment of
Interim Rental on the fifteenth day after the end of such calendar month.

6.    PERIODIC RENTAL
      ---------------
Lessee shall pay rent ("Periodic Rental") for the Basic Term in the amounts and
in accordance with the payment schedule set forth in the Addendum. THIS IS AN
IRREVOCABLE LEASE AND, ANY PRESENT OR FUTURE LAW TO THE CONTRARY
NOTWITHSTANDING, LESSEE'S OBLIGATION TO PAY LESSOR OR ITS ASSIGNS ALL AMOUNTS
DUE HEREUNDER IS ABSOLUTELY UNCONDITIONAL AND THIS LEASE SHALL NOT TERMINATE BY
OPERATION OF LAW OR OTHERWISE, EXCEPT UPON EXPIRATION OF THE BASIC TERM AND ANY
RENEWAL TERM AND PAYMENT OF ALL AMOUNTS REQUIRED TO BE PAID HEREUNDER. LESSEE
SHALL NOT BE ENTITLED TO ANY ABATEMENT, REDUCTION, SETOFF, COUNTERCLAIM, DEFENSE
OR DEDUCTION WITH RESPECT TO ANY OF THE RENTALS REQUIRED TO BE PAID HEREUNDER OR
ANY OTHER AMOUNTS PAYABLE BY THE LESSEE HEREUNDER, NOR SHALL ANY OBLIGATIONS OF
LESSEE HEREUNDER BE AFFECTED FOR ANY REASON WHATSOEVER, NO MATTER HOW, WHEN OR
AGAINST WHOM ASSERTED, ARISING OR CLAIMED, provided, however, that Lessee may
                                           --------  -------  
institute an independent action or claim against Lessor (but not against any
collateral assignee of Lessor) for any alleged breach hereof.

7.    LATE PAYMENT
      ------------
If any installment of rent or other sum owing under the Lease shall not be paid
when due and shall remain unpaid for ten (10) days, Lessee shall pay Lessor a
late charge equal to five percent (5%) of the amount delinquent, but in no event
at a rate greater than limited by any applicable law. Such late charge is in
addition to and not in lieu of other rights and remedies Lessor may have.

8.    INSURANCE
      ---------
Lessee shall procure and continuously maintain and pay for (a) all risk
insurance, excluding earthquake and flood insurance, against loss or damage to
the Equipment for not less than the full replacement value thereof naming Lessor
as Loss Payee and (b) combined single limit liability insurance, insuring Lessor
and Lessee, all in such amounts and against such risks and hazards as are set
forth in the Addendum, with insurance companies and pursuant to contracts or
policies reasonably satisfactory to Lessor. All contracts and policies shall
include provisions for the protection of Lessor notwithstanding any act or
neglect of or breach or

                                    Page 3

<PAGE>

default by Lessee, shall provide that proceeds of all insurance shall be payable
first to Lessor to the extent of its liability or interest as the case may be,
shall provide that they may not be modified, terminated or canceled unless
Lessor is given at least thirty (30) days' advance written notice thereof, and
shall provide that the coverage is "primary coverage" for the protection of
Lessee and Lessor notwithstanding any other coverage carried by Lessee or Lessor
protecting against similar risks. Lessee shall promptly notify any appropriate
insurer and Lessor of each and every occurrence which may become the basis of a
claim or cause of action against the insureds and provide Lessor with all data
pertinent to such occurrence. Lessee shall furnish Lessor with certificates of
such insurance or copies of policies upon request, and shall furnish Lessor with
renewal certificates not less than ten (10) days prior to the renewal date.

9.    TAXES
      -----
Lessee shall pay all taxes, fees, assessments and other governmental charges of
whatsoever kind or character and by whomsoever payable on or relating to any
Item of Equipment or the sale, purchase, ownership, use, value, value added,
possession, shipment, transportation, delivery or operation thereof or the
exercise of any option, election or performance of any obligation by Lessee
hereunder, which may accrue or be levied, assessed or imposed during the Term
and any Renewal Term or which remain unpaid as of the date of surrender of such
Item to Lessor, and all taxes of any kind imposed by any federal, state, local,
or foreign taxing authority against Lessor on or measured by any amount payable
by Lessee hereunder, including, without limitation, all license and registration
fees and all sales, use, value, ad valorem, personal property, excise, gross
receipts, stamp or other taxes, imposts, duties and charges together with any
penalties, fines or interest thereon, except taxes of Lessor on net income
imposed by the United States or any state. Lessee shall reimburse Lessor for any
payments made by Lessor which are the obligation of Lessee under the Lease, but
Lessee shall not be obligated to pay any amount under this Section so long as it
shall in good faith and by appropriate proceedings contest the validity or the
amount thereof, unless such contest would adversely affect Lessor's interest in
any Item of Equipment or would subject any Item to forfeiture or sale. Lessee
shall indemnify Lessor on an after-tax basis against any loss, claim, demand and
expense, including legal expense, resulting from such nonpayment or contest and
further agrees to indemnify Lessor against any and all taxes, assessments and
other charges imposed upon Lessor under the laws of any federal, state, local or
foreign government or taxing authority, as a result of any payment made by
Lessee pursuant to this Section. On request of either Lessor or Lessee, the
other will submit written evidence of all payments required of it under this
Section.

10.   MAINTENANCE, ETC.
      ----------------

      (A) Lessee at its expense at all times shall maintain, service and repair
any damage to the Equipment so as to; (1) keep the Equipment in good and
efficient working order, condition and repair, ordinary wear and tear resulting
from the proper use excepted, and make all inspections and repairs, including
replacement of worn parts (which replacement parts shall be free and clear of
all liens and encumbrances and shall, upon incorporation into the item, become
free and clear of all other liens and encumbrances subject Lessor's security,
interest and shall be kept, to effect the foregoing and to comply with
requirements of laws, regulations, rules and provisions and conditions of
insurance policies; and (ii) pay all costs, expenses, fees and charges incurred
in connection with the use or operation of the Equipment and of each item,
including but not limited to repairs, maintenance, storage and servicing. Lessee
shall, at its sole cost and expense, make all alterations, substitutions,
improvements or additions to the Equipment or items required in order to comply
with laws, regulations, rules and insurance policies ("Required Additions").
Additionally, Lessee may install any addition or improvement on an item which is
readily removable without causing material damage to such item and which does
not impair the value of such item as originally delivered to Lessee ("Severable
Additions"). Lessee shall not make any alterations, substitutions, improvements
or additions to the Equipment or any item, except Required Additions or
Severable Additions, unless Lessor first shall have consented thereto in
writing, Notwithstanding any consent of Lessor, Lessee shall pay all costs and
expenses of the foregoing. All replacements, repairs, improvements, alterations,
substitutions and additions shall constitute accessions to the Equipment and
upon incorporation into the Equipment shall become subject to Lessor's security
interest shall be kept free of any and all other liens; provided, however, that
Lessee may remove Severable Additions at any time, provided that Lessee shall
repair all damage to such Equipment

                                    Page 4

<PAGE>
resulting from such installation and removal so as to restore the Equipment to
the condition in which it existed prior to the installation of such Severable
Additions, ordinary wear and tear excepted. In performing its obligations under
this Section, Lessee will not treat the Equipment less favorable than similar
equipment that it owns or leases, or reduce its performance in contemplation of
expiration of the Term or any Renewal Term.

     (B) Lessor hereby transfers and assigns to Lessee, for so long during the
Term and any Renewal Term as Lessee is not in default, Lessor's right, title and
interest in, under and to any assignable factory and dealer warranty, whether
express or implied, with respect to the Equipment. All claims and actions upon
any warranty shall be made and prosecuted by Lessee at its sole cost and
expense. Lessor shall have no obligation to make or prosecute any claim upon or
under a warranty. So long as Lessee shall not be in default, Lessor shall
cooperate with Lessee with respect to a claim on a non-assignable warranty, at
Lessee's expense. Lessee shall have proceeds of a warranty claim or recovery
paid to Lessor. Lessor shall make such proceeds available for any repair,
restoration or replacement to correct such warranted condition. Excess proceeds
shall be used to reduce Lessee's Lease obligations.

11.  USE
     ---
So long as Lessee shall not be in default, Lessee shall be entitled to the
possession, use and quiet enjoyment of the Equipment during the Term and any
Renewal Term in accordance with the terms of the Lease. Lessee warrants that the
Equipment will at all times be used and operated solely in the conduct of
Lessee's business for the purpose for which it was designed and intended and
under and in compliance with applicable laws and all lawful acts, rules,
regulations and orders of any governmental bodies or officers having power to
regulate or supervise the use of such property, except that Lessee may in good
faith and by appropriate proceedings contest the application of any such rule,
regulation or order in any reasonable manner that will not adversely affect the
interest of Lessor in any Equipment or subject the same to forfeiture or sale.
Lessee will not permit its rights or interest hereunder to be subject to any
lien, charge or encumbrance and will keep the Equipment free and clear of any
and all liens, charges, encumbrances and adverse claims (except those arising
from acts of Lessor).

12.  NET LEASE; LOSS AND DAMAGE
     --------------------------

     (A) This is a net lease. Lessee assumes all risk of and shall indemnify
Lessor against all damage to and loss of the Equipment from any cause
whatsoever, whether or not such loss or damage is or could have been covered by
insurance. Except as otherwise specifically provided herein, the Lease shall not
terminate and there shall be no abatement, reduction, suspension or deferment of
Interim or Periodic Rental for any reason, including damage to or loss of the
Equipment or any one or more Items. Lessee promptly shall give Lessor written
notice of any material loss or damage, describing completely and in detail the
cause and the extent of loss and damage. At the option Lessor, Lessee shall: (i)
repair or restore the damaged or lost Items to good condition and working order;
or (ii) replace the damaged or lost Items with similar equipment or equipment
which in Lessor's reasonable and sole determination is of equal or greater value
in good condition and working order; or (iii) pay Lessor in cash the Stipulated
Loss Value of the damaged or lost Items; provided, however, that the foregoing
shall be at Lessee's option rather than Lessor's option if the following
conditions are met at the time of such loss or damage: (1) Lessee has paid all
amounts that are required to be paid under this Master Lease and under any
Addendum hereto; (2) Lessee is not otherwise in default, and no event shall have
occurred that with the passage of time or the giving of notice or both would
constitute a default, under any Addendum hereto or this Master Lease; (3) Lessor
shall have determined, in its reasonable and sole discretion, that Lessee will
be able to perform its remaining obligations hereunder and under any Addendum
hereto; and (4) all Equipment then remaining subject to the Master Lease and all
addenda shall have a value that is, in Lessor's sole reasonable discretion,
adequate to satisfy all of Lessee's obligations then remaining due and unpaid
hereunder and under all addenda hereto. Upon Lessee's complying with the
foregoing, Lessor shall pay or cause to be paid over to Lessee the net proceeds
of insurance, if any, with respect to such damage or loss. "Damage" and "loss"
shall include damages and losses of any kind whatsoever including, without
limitation, physical


                                     Page 5

<PAGE>

damage and partial or complete destruction, including intentionally caused
damage and destruction, and theft.

       (B) If Lessee pays Lessor the Stipulated Loss Value for an Item, then the
Lease shall terminate with respect to that Item, that Item shall no longer be
deemed part of the Equipment and Lessee shall be entitled to retain the Item.
However, it is understood that Lessor makes no representation or warranty with
respect to the Item, and further that Lessor shall have no obligation to pay any
tax with respect thereto. In the event that Lessee pays Lessor the Stipulated
Loss Value for an Item, no further Interim Rental shall be payable with respect
to the Item, and Periodic Rental for the remainder of the Term shall be reduced
accordingly.

13.   STIPULATED LOSS VALUE
      --------------------- 
The "Stipulated Loss Value" of an Item shall be the Total Cost for such Item.

14.   SECURITY INTEREST AND MARKING
      -----------------------------

      (A) This lease is one intended as security and for tax purposes, both
parties will treat this transaction as a secured loan by Lessor to Lessee.

      (B) If so requested by Lessor, Lessee will affix tags, supplied by
Lessor, reflecting Lessor's security interest in the Equipment.

15.   LESSEE'S INDEMNITIES
      --------------------
Lessee will defend, indemnify and hold harmless Lessor from and against any
claim, cause of action, damage, liability, cost or expense (including but not
limited to legal fees and costs) which may be asserted against or incurred in
any manner by or for the account of Lessor or Lessee: (i) relating to the
Equipment or any part thereof, including without limitation the manufacture,
construction, purchase, delivery, acceptance or rejection, installation,
ownership, sale, leasing, removal or return of the Equipment, or as a result of
the use, maintenance, repair, replacement, operation or the condition thereof
(whether defects are latent or discoverable); (ii) by reason or as a result of
any act or omission of Lessee for itself or as agent or attorney-in-fact for
Lessor hereunder; (iii) as a result of claims for patent, trademark or copyright
infringement; or (iv) as a result of product liability claims or claims for
strict liability.

16.   LESSOR MAY PERFORM
      ------------------
If Lessee at any time shall fail to pay to any person any sum which Lessee is
required by the Lease to pay or shall fail to do or perform any other thing
Lessee is required by the Lease to do or perform, Lessor at its option may pay
such sum or do or perform such thing, and Lessee shall reimburse Lessor on
demand for the amount of such payment and for the cost and expense which may be
incurred by Lessor for such acts or performance, together with interest thereon
at the Default Rate from the date of demand until paid.

17.   EVENTS OF DEFAULT AND REMEDIES
      ------------------------------

      (A) Events Of Default. Each of the following shall constitute an event of
          -----------------
default:
           (i)   Failure to perform and comply with the provisions and
                 conditions of Section 8 hereof; or 

           (ii)  Failure to pay within 10 days of the date when due, any sum,
                 including installments of rental, owed by Lessee or any
                 affiliate of Lessee at anytime to Lessor; or

           (iii) Failure to perform and comply with any other provision or
                 condition of the Lease within thirty (30) days after Lessor
                 shall have given Lessee written notice of default with respect
                 thereto; or

           (iv)  Any event of default occurs with respect to any obligations of
                 Lessee to Lessor (or to any affiliate of Lessor, including
                 without limitation, MetLife Capital, Limited Partnership and
                 Metropolitan Life Insurance Company and their respective
                 affiliates and/or

                                    Page 6

<PAGE>
                    subsidiaries) on or with respect to any transactions, debts,
                    undertakings or agreements other than the lease; or
          (v)       If any representation or warranty made by Lessee herein or
                    in any statement or certificate furnished by Lessee in
                    connection with this Agreement proves untrue in any material
                    respect as of the date of making thereof, and shall not be
                    made good within thirty (30) days after written notice
                    thereof to Lessee, or Lessee becomes insolvent or is
                    generally not paying its debts as they become due or makes
                    an assignment for benefit of creditors; or
          (vi)      Proceedings are commenced by Lessee under the Federal
                    Bankruptcy Code or any similar Federal or State laws for the
                    relief of debtors are commenced against Lessee and are not
                    dismissed within sixty (60) days after such commencement, or
                    a trustee or receiver is appointed for Lessee or a major
                    part of its property and is not discharged within thirty
                    (30) days after such appointment; or
          (vii)     Any item of Equipment is seized or levied on under legal or
                    governmental process against Lessee or against such item of
                    Equipment or for any reason Lessor deems itself insecure; or
          (viii)    The merger, consolidation, reorganization, conversion to a
                    Subchapter "S" status or dissolution of a corporate or
                    partnership Lessee which has a materially adverse effect
                    upon Lessor's position under the Lease.

      (B) REMEDIES. The occurrence of an Event of Default shall terminate any
          --------
obligation of Lessor to lease Equipment or Items thereof to Lessee. When an
Event of Default has occurred and is continuing, Lessor at its option may:
          (i)       Proceed by appropriate court action or actions, either at
                    law or in equity, to enforce performance by the Lessee of
                    the applicable covenants of this Lease or to recover damages
                    for the breach thereof; and/or
          (ii)      Without notice or demand declare immediately due and payable
                    the entire Stipulated Loss Value of any and all Items of
                    Equipment then under lease plus any and all amounts which
                    under the terms of the Lease may be then due; and thereupon
                    MetLife shall have an immediate right to pursue all remedies
                    provided by law, and, in that regard, Lessee hereby agrees
                    as follows: 
                    (a)  Lessee agrees to put Lessor in possession of the
                         Equipment on demand;
                    (b)  Lessor is authorized to enter any premises where
                         Equipment is situated and take possession thereof
                         without notice or demand and without legal proceedings;
                    (c)  At Lessor's request, Lessee will assemble the Equipment
                         and make it available to Lessor at a place designated
                         by Lessor which is reasonably convenient to both
                         parties;
                    (d)  Lessee agrees that ten (10) days from the time notice
                         is sent shall be a reasonable period of notification of
                         a sale or other disposition of the Equipment;
                    (e)  Lessee agrees to pay on demand the amount of all
                         expenses reasonably incurred by Lessor in protecting or
                         realizing on the Equipment;
                    (f)  If Lessor disposes of the Equipment, Lessee agrees to
                         pay any deficiency remaining after application of the
                         net proceeds to the amounts due hereunder.
If upon the occurrence of an Event of Default, Lessor brings suit or otherwise
incurs expenses for protection of Lessor's rights, Lessee will pay Lessor its
legal fees, in a reasonable amount, together with Lessor's collection expenses
and court costs. In addition, from and after an Event of Default, Lessee shall
be liable for interest on amounts due Lessor hereunder at a rate per annum
computed monthly which shall be five (5) percentage points above the prime rate,
but not greater than the maximum rate, if any, limited by applicable law
("Default Rate"); provided however, that Lessee shall not be assessed a late
charge during such period of time that Default Rate is accruing against Lessee
as herein stated. The remedies herein provided in favor of Lessor shall not be
deemed to be exclusive but shall be concurrent and cumulative and in addition to
all

                                    Page 7

<PAGE>

other remedies available at law or equity. The exercise or partial exercise of
any remedy shall not restrict Lessor from further exercise of that remedy or any
other remedy.

18.   SURRENDER
      ---------
At any time that Lessee is required to deliver the Equipment to Lessor, Lessee
shall immediately cease using the Equipment and at Lessee's expense shall
redeliver and surrender the Equipment to Lessor in good order, condition and
repair, ordinary wear and tear excepted, securely crated and safely packed, at a
place to be designated by Lessor in the State where the Equipment by the terms
of the Addendum is required to be kept, and, if Lessor so specifies, loaded FOB
on a common or contract carrier designated by Lessor.

19.   HOLDOVER
      --------
If Lessee shall not immediately redeliver and surrender any Item of Equipment to
Lessor when required by the terms hereof, Lessee shall pay Lessor, at such time
or times as Lessor may demand, a sum equal to a one-month installment of
Periodic Rental for each calendar month or fraction of a month during which such
failure to redeliver and surrender continues.

20.   INSPECTION; REPORTS
      -------------------
Lessor, its agents and employees shall have the right to enter upon any premises
where the Equipment or Items are then located to inspect and examine the same
during normal business hours and, if Lessor reasonably believes any Items or
Lessor's rights are in jeopardy of damage or loss, at any other times. So long
as Lessee is not in default, Lessor shall give Lessee not less than forty-eight
(48) hours notice of such inspection. Lessee shall immediately give Lessor
written notice of any damage to or loss of the Equipment or any Items from any
cause, including without limitation damage or loss caused by accident, the
elements, intentional acts and theft. Such notice shall set forth an itemization
of the affected Items and a detailed account of the event, including names of
any injured persons and a description of any damaged property arising from any
such event or from any use or operation of the Equipment or any Items, and of
any attempt to take, distrain, levy upon, seize or attach the Equipment or any
Items. All rights granted to Lessor herein are for the benefit of Lessor and
shall not be construed to impose any obligation on Lessor, whether or not Lessor
makes any inspections or receives any reports.

21.   FINANCIAL AND OTHER DATA
      ------------------------
During the Term and any Renewal Term, Lessee: (a) shall furnish Lessor annual
balance sheets and profit and loss statements of Lessee and any guarantor of
Lessee's obligations accompanied, at Lessor's request, by the audit report of an
independent certified public accountant reasonably acceptable to Lessor; and (b)
at Lessor's request, shall furnish Lessor all other publicly available financial
information and reports reasonably requested by Lessor when publicly available,
including quarterly or other interim balance sheets and profit and loss
statements of Lessee and any such guarantor. Lessee shall furnish such other
information as Lessor may reasonably request at any times concerning Lessee and
its affairs.

22.   WARRANTY OF INFORMATION
      ----------------------- 
Lessee warrants that all information furnished and to be furnished to Lessor is
accurate and that all financial statements it has furnished and hereafter may
furnish Lessor, including operating statements and statements of condition, are
and will be prepared in accordance with generally accepted accounting
principles, consistently applied, and reasonably reflect and will reflect, as of
their respective dates, results of the operations and the financial condition of
Lessee and of any other entity they purport to cover.

23.   NON-WAIVER
      ----------
Neither the acceptance by Lessor of any payment or any other performance, nor
any act or failure of Lessor to act or to exercise any rights, remedies or
options in any one or more instances shall constitute a waiver of any such
right, remedy or option or of any other then existing or thereafter accruing
right, remedy or option, or of any breach or default then existing or thereafter
occurring. No purported waiver by Lessor of any right, remedy, option, breach or
default shall be binding unless in writing and signed by an officer of Lessor. A
written waiver by Lessor of any right, remedy, option, breach or default shall
not constitute a

                                    Page 8
<PAGE>

waiver of any other then existing or thereafter accruing right, remedy or option
or of any other then existing or thereafter occurring breach or default.

24.   NOTICES; PAYMENTS
      -----------------

      (A)     A written notice may be given: (i) by delivering the same to a
corporate officer of the party to whom it is directed (the "Addressee"), or to a
general partner if the Addressee is a partnership, or to the owner if the
Addressee is a sole proprietorship; or (ii) by mailing the notice to the
Addressee by first class mail, registered or certified, with postage prepaid,
addressed to the Addressee at the address following its name in the opening
paragraph of this Master Lease or to such other address as Addressee may specify
by notice in writing given in accordance with this Section. A notice so mailed
shall be deemed given on the third business day following the date of mailing. A
"business day" shall be any day that is not a Saturday or Sunday or a legal
holiday.

      (B)     The Lessee shall make all payments to Lessor at the place where
the notice is to be mailed to Lessor pursuant to subparagraph (A). Payments are
deemed paid when received by Lessor.

25.   ASSIGNMENT
      ----------

      (A)     Lessee shall not assign the Lease or any rights in or to the
Equipment or Items. Any attempted assignment shall be of no effect, unless
Lessor first shall have consented thereto in writing. Lessor's consent to an
assignment in any one or more instances shall not impose any obligation upon
Lessor to consent to any other or further assignments. Lessor's consent to an
assignment shall not release Lessee from any obligations with respect to the
Lease unless expressly so stated in the written consent.

      (B)     All rights of Lessor hereunder may be assigned, pledged,
mortgaged, transferred or otherwise disposed of, either in whole or in part,
without notice to Lessee but subject always to the rights of Lessee under this
lease. If Lessee is given notice of any such assignment, Lessee shall
acknowledge receipt thereof in writing. In the event that Lessor assigns this
Lease or the rent due or to become due hereunder or any other interest herein,
whether as security for any of its indebtedness or otherwise, no breach or
default by Lessor hereunder or pursuant to any other agreement between Lessor
and Lessee, should there be one, shall excuse performance by Lessee of any
provision hereof, it being understood that in the event of such default or
breach by Lessor that Lessee shall pursue any rights on account thereof solely
against Lessor. No such assignee shall be obligated to perform any duty,
covenant or condition requested to be performed by Lessor under the terms of
this Lease.

26.   SURVIVAL
      --------
The representations, warranties, indemnities and agreements of Lessee, and
Lessee's obligations under any and all provisions of the Lease, shall survive
the expiration or other termination of the Lease, shall be binding upon its
successors and assigns and are expressly made for the benefit of and shall be
enforceable by Lessor and its successors and assigns.

27.   MISCELLANEOUS
      -------------
      (A)    The term "Lessor" shall mean the Lessor named herein and its
successors and assigns.

      (B)    Whenever the context so requires, any pronoun gender includes all
other genders, and the singular includes the plural. If more than one person
constitute Lessee, whether as a partnership or otherwise, all such persons are
and shall be jointly and severally liable for all agreements, undertakings and
obligations of Lessee.

      (C)    All captions and section, paragraph and other divisions and
subdivisions are for convenience of reference only and shall not affect the
construction, interpretation or meaning of the agreement or Lease or of any of
the provisions thereof.

                                    Page 9

<PAGE>

     (D)  This Lease shall be governed by and construed according to the law of
the State of Washington.

     (E)  This Lease shall be binding upon and, except as limited in Section 25
hereof, shall inure to the benefit of Lessor and Lessee and their respective
successors and assigns.

     (F)  This Lease cannot be canceled or terminated except as expressly
provided herein.

     (G)  Wherever Lessor's consent is required hereunder, such consent will not
be unreasonably withheld.

     (H)  Lessee's obligation to pay or reimburse Lessor for expenses as
provided hereunder shall be limited to reasonable expenses.

28.  LESSOR'S DISCLAIMER
     -------------------
Lessee acknowledges and agrees that it has selected both the Equipment of the
type and quantity which is the subject of this Lease and the supplier from whom
the Equipment was purchased. LESSOR MAKES NO REPRESENTATION OR WARRANTY, EXPRESS
OR IMPLIED, AS TO THE DESIGN, COMPLIANCE WITH SPECIFICATIONS, CONDITION,
QUALITY, WORKMANSHIP, OR THE SUITABILITY, ADEQUACY, OPERATION, USE OR
PERFORMANCE OF THE EQUIPMENT OR AS TO ITS MERCHANTABILITY OR FITNESS FOR ANY
PARTICULAR PURPOSE. ANY DELAY IN DELIVERY SHALL NOT AFFECT THE VALIDITY OF THIS
LEASE. The Lessee understands and agrees that neither the supplier nor any
salesman or any agent of the supplier is an agent of Lessor. No salesman or
agent of supplier is authorized to waive or alter any term or condition of this
Lease, and no representation as to the Equipment or any other matter by the
supplier shall in any way affect Lessee's duty to pay the rent and perform its
obligations as set forth in this Lease. Lessor shall not be liable to Lessee for
any incidental, consequential, or indirect damages or for any act, neglect,
omission, breach or default by any third party.

29.  NO AFFILIATION WITH SUPPLIERS
     -----------------------------
Lessee warrants that neither it nor any of its officers, directors (if a
corporation) or partners (if a partnership) has, directly or indirectly, a
substantial financial interest in the manufacturer or supplier of any Equipment
except as previously disclosed in writing to Lessor.

30.  ENTIRE AGREEMENT
     ----------------
This Master Lease and any Lease Purchase Addenda hereto shall constitute the
entire agreement between the parties and shall not be altered or amended except
by an agreement in writing signed by the parties hereto or their successors or
assigns.

     IN WITNESS WHEREOF Lessor and Lessee have signed this agreement as of the
day and year first hereinabove written.

LESSOR:                                LESSEE:

METLIFE CAPITAL CORPORATION            VITESSE MANUFACTURING &
                                       DEVELOPMENT CORPORATION, a wholly
                                       owned subsidiary of VITESSE
                                       SEMICONDUCTOR CORPORATION

By: /s/ Scott Rhodes                   By: /s/ Eugene Hovanec
   ------------------------------         ---------------------------------
Its Scott Rhodes 
    Vice President                     Its VP Finance
   ------------------------------         ---------------------------------

                                    Page 10

<PAGE>
 
                         LEASE PURCHASE ADDENDUM NO. 1

         THIS ADDENDUM is entered into the 9 day June, 1998 of between MetLife
Capital Corporation ("Lessor") whose mailing address is C-97550, Bellevue,
Washington 98009 and VITESSE MANUFACTURING & DEVELOPMENT CORPORATION, a wholly
owned subsidiary of VITESSE SEMICONDUCTOR CORPORATION ("Lessee") whose address
is 741 Calle Plano, Camarillo, CA 93012.

          Lessee has requested to lease from Lessor the following items of
personal property (individually, an "Item" and, collectively, the "Equipment")
for the prices and for delivery as follows:

<TABLE> 
<CAPTION> 
- ------------------------------------------------------------------------------------------------------------------
Name and Address                              Complete Description of Equipment
of Supplier                    Quantity                                                            Price
- ------------------------------------------------------------------------------------------------------------------
<S>                            <C>            <C>                                                <C> 
                                              New Semiconductor Manufacturing Equipment          10,000,000.00
                                              Serial No.
                                                                      -------------------------------------------- 
                                                                        TOTAL PRICE             $10,000,000.00
                                                                      -------------------------------------------- 
                                                                        FED. EXCISE TAX         $
                                                                      -------------------------------------------- 
                                                                        TRANSPORTATION          $
                                                                      --------------------------------------------
                                                                        OTHER                   $
- ------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------
Date                                   Delivery Instructions to be
Delivery                               as specified by Lessee                 TOTAL COST: $10,000,000.00
Expected: May 15, 1998                 to Supplier
- ------------------------------------------------------------------------------------------------------------------
SHIP TO
LESSEE AT:        4323 ARROWS WEST DRIVE, COLORADO SPRINGS, CO 80907 AND
                  741 CALLE PLANO, CAMARILLO, CA 93012
- ------------------------------------------------------------------------------------------------------------------
</TABLE> 

Lessee and Lessor AGREE that subject to the conditions and agreements herein and
in the Master Lease referred to below (i) Lessor shall lease the Equipment to
Lessee, and (ii) Lessee shall lease the Equipment from Lessor and perform and
comply with the provisions of this Agreement.

CERTAIN DEFINITIONS AND STIPULATIONS:
     Purchase Cut-Off Date:        September 30, 1998

     Particular Lease Terms:
         Length of Basic Term:            48       Months
         "Interim Rental Rate": equal to Chase Manhattan Bank's Prime rate.

         "Periodic Rental Rate" will be calculated at a variable rate equal to
         the average weekly yield of the 30-Day Commercial Paper (financial) in
         effect from time to time (as published in the Federal Reserve
         Statistical Release H.15[519]) plus 1.5% (the "Variable Rate") computed
         on the basis of a 360 day year of twelve consecutive 30 day months and
         the payment is payable monthly in arrears.

         Lessee shall make Monthly Rental Payments during the Basic Term and any
         Renewal Term in an amount equal to (1) "Tranche A" interest only at a
         rate equal to two percent (2%) per annum on an assumed original balance
         of $8,000,000, and (2) "Tranche B" the "Level Payment Amount" set forth
         in the following paragraph. In addition, Lessee shall make the annual
         cleanup payments as set forth in the following paragraph.

         For the first year of the Lease, the Level Payment Amount shall be
         $11,666.67 per month. The monthly Level Payment Amount for each twelve
         month period following the initial twelve months of the Basic Term,
         including the Level Payment Amount for the Renewal Term, if any, will
         be calculated by applying the then current Variable Rate over the
         remaining Basic Term to the then outstanding amount due. Lessor will
         adjust the Level Payment Amount in accordance with the preceding
         formula on each anniversary of the Closing Date for each year during
         the Basic Term and for the Renewal Term, if any.

         On each anniversary of the Closing Date, the aggregate Level Payment
         Amount for the preceding year will be compared with what the aggregate
         monthly rental payments would have been for that year had they been
         calculated monthly using the Variable Rate. (The aggregate amount that
         would have been paid had the monthly payments been calculated using the
         actual Variable Rate is referred to herein as the "Actual Aggregate
         Amount"). If the Actual Aggregate Amount is greater than the aggregate
         Level Payment Amount paid by Lessee for that year, then Lessee shall
         remit the difference to Lessor upon receipt of an invoice therefor. If
         the Actual Aggregate Amount is less than the aggregate Level Payment
         Amount paid by Lessee for that year, then such over-payment shall be
         credited to Lessee's rental payments for the subsequent year or, in the
         case of the end of the Basic Term or any Renewal Term, such over-
         payment shall be credited to the amount Lessee owes to Lessor under the
         end of term provisions set forth below.

<PAGE>

END OF TERM PROVISIONS

          a)      On the last day of the Basic Term, Lessee may purchase for
          cash all but not less than all of the Equipment then under the Master
          Lease and all schedules and addenda thereto for a price equal to 100%
          of the Total Cost (the "Purchase Price").

          (b)     If Lessee elects not to purchase the Equipment pursuant to (a)
          above, then Lessee may either (i) renew the Lease, pursuant to
          Subsection (c) below, or (ii) sell the equipment in a commercially
          reasonable manner, or, at Lessor's option, Lessor will sell the
          Equipment as agent for Lessee. In no event will Lessee sell the
          Equipment for less than 90% of the Total Cost without Lessor's prior
          written consent. All net proceeds of sale shall be paid to Lessor;
          provided, however, that if the net proceeds of sale exceed 100% of
          --------  -------                                          
          the Total Cost, then such excess shall be paid to Lessee; and,
          provided, further, that if the net proceeds of sale are less than 100%
          --------  -------                                          
          of the Total Cost, then Lessee shall pay to Lessor the difference to
          a maximum of 86% the Total Cost. (The amount payable to Lessor under
          this subsection (b) is referred to herein as the "Sale Price.")

          (c)     If Lessee neither purchases nor sells the Equipment in
          accordance with Sections (a) or (b) above, then on the last day of the
          Basic Term the Lease will be renewed for a period of 12 months (the
          "Renewal Term"). The Monthly Rental Payment and the Level Payment
          Amount for the Renewal Term shall be an amount calculated by Lessor
          pursuant to the provisions set forth above under the heading
          "Particular Lease Terms" and shall be payable monthly in arrears. On
          the last day of the Renewal Term, Lessee shall have the option to
          purchase all but not less than all of the Equipment then under Lease
          for a price equal to 100% of the Total Cost. If Lessee does not
          exercise this purchase option, then Lessee shall sell the Equipment
          or, at Lessor's option, Lessor shall sell the Equipment as agent for
          Lessee, in a commercially reasonable manner. In no event will Lessee
          sell the Equipment for less than 90% of the Total Cost without
          Lessor's prior written consent. All net proceeds of sale shall be paid
          to Lessor; provided, however, that if the net proceeds of sale exceed
                     --------  -------        
          100% of the Total Cost, then such excess shall be paid to Lessee; and
          provided, further, that if the net proceeds of sale are less than 100%
          --------  -------
          of the Total Cost, then Lessee shall pay to Lessor the difference to a
          maximum of 86% of the Total Cost.

          Regardless of whether Lessee elects to purchase the Equipment, to sell
          the Equipment, or to renew the Lease, in any such case Lessee shall
          deliver to Lessor written notice of its election not less than one
          hundred twenty (120) days prior to the last day of the Basic Term.

          Premises where Equipment will be kept:   4323 Arrows West Drive,
                                                   --------------------------
                                                   Colorado Springs, CO 80907
                                                   --------------------------
                                                   741 Calle Plano, Camarillo,
                                                   --------------------------
                                                   CA 93012
                                                   --------------------------

INSURANCE REQUIRED:
      LIABILITY. Not less than $10,000,000.00 Combined Single Limit Liability
      insurance, including bodily injury and death and property damage, naming
      Lessor as additional insured. 
      PHYSICAL DAMAGE. Not less than $ 10,000,000 All risk physical damage
      insurance, including loss by burglary, theft, and malicious mischief, for
      full replacement value of the equipment, naming Lessor as loss payee.
      Other: __________________________________________________________________

EARLY PURCHASE OR SALE/YIELD MAINTENANCE PREMIUM:  Lessee shall have the option
at any time after the 2/nd/ anniversary of the Closing Date to purchase or sell
all but not less than all of the Equipment then remaining under the Master Lease
and all schedules and addenda thereto. The terms of any such purchase or sale
shall be as set forth under subsections (a) or (b), respectively, of the section
above titled "End of Term Provisions." In addition, it shall be a condition
precedent to Lessee's right to exercise the early purchase or sale option that
Lessee shall not then be in default hereunder or under the Master Lease and that
Lessee pays all amounts set forth in, and otherwise complies with the terms of,
this subsection. If Lessee elects to purchase or sell the Equipment, Lessee
shall deliver to Lessor not less than one hundred twenty (120) days prior
written notice of its election. At the end of the 120 day period (the day on
which the 120-day period ends being referred to herein as the "Termination
Date"), Lessee shall pay to Lessor, in cash, the sum of (i) the Purchase Price
or the Sale Price for all Equipment then under the Master Lease and any
schedules or addenda thereto plus (ii) the Yield Maintenance Amount calculated
as set forth below with respect to all Equipment then under the Master Lease and
all schedules and addenda thereto plus (iii) the Periodic Rental then due under
the Master Lease and any schedules and addenda thereto plus (iv) all other
amounts that have accrued and remain unpaid hereunder and under the Master Lease
and any schedules and addenda thereto as of the Termination Date.

The Yield Maintenance Amount (YMA) is determined by multiplying the YMA Premium
Factor by the Total Cost. 

                              YMA Premium Factors
                              -------------------

    YMA Premium Factor after the 2/nd/ anniversary of the Closing Date is 0.0860
    YMA Premium Factor after the 3/rd/ anniversary of the Closing Date is 0.0442

MASTER LEASE:  Lessor and Lessee are entering into or have entered into a Master
Lease Purchase Agreement ("Master Lease") dated July 9 1998. All of the terms,
conditions, agreements and provisions of the Master Lease are incorporated
herein by this reference and constitute a part of this Addendum. If there shall
be any conflict between any provision of the Master Lease and a provision of
this Addendum, the provision of the Addendum shall govern.




<PAGE>
                                                              
SUBSTITUTION OF EQUIPMENT: Notwithstanding any provision herein or in the Master
Lease to the contrary. Lessee shall have the right at any time during the term
of the Lease to deliver to Lessor a written request that Lessor accept as
substitute collateral, equipment that (1) has a then fair market value equal to
or greater than the then fair market value of the Equipment being substituted,
as determined by Lessor in its sole reasonable discretion, and (2) satisfies all
the other representations and warranties with respect to the Equipment that are
set forth herein and in the Master Lease. If Lessor determines that the
substitute equipment meets the preceding requirements, Lessor shall so notify
Lessee. Lessee shall execute and deliver to Lessor such filings and documents as
Lessor shall reasonably require with respect to the substitution and the
substitute equipment, including without limitation financing statements or
amendments thereto for filing in appropriate jurisdictions to perfect and
protect Lessor's interest in the substitute equipment. Lessee shall pay any and
all costs and expenses reasonably incurred by Lessor in connection with the
substitution including without limitation the cost of any lien searches
reasonably required by Lessor to ascertain that the substitute equipment is free
and clear of all liens and encumbrances. When Lessor has determined that it has
a perfected, first priority security interest in the substitute equipment, such
equipment shall become Equipment for all purposes hereunder and under the Master
Lease and the substituted Equipment shall be released from the lien of the
Master Lease.

RELEASE OF SECURITY INTEREST: Notwithstanding the provisions set forth in
Section 2(A) of the Master Lease to the contrary, if the following conditions
are met, Lessor shall release its security interest in the Equipment specified
in this Addendum: (1) Lessee has paid all amounts that are required to be paid
hereunder and under the Master Lease; (2) Lessee is not otherwise in default,
and no event shall have occurred that with the passage of time or the giving of
notice or both would constitute a default, under the Master Lease, this
Addendum, or any other addendum; (3) Lessor shall have determined, in its
reasonable and sole discretion, that Lessee will be able to perform its
remaining obligations under the Master Lease; and (4) all Equipment other than
the Equipment under this Schedule then remaining subject to the Master Lease and
all other addenda shall have a value that is, in Lessor's sole reasonable
discretion, adequate to satisfy all of Lessee's obligations then remaining due
and unpaid under the Master Lease and all addenda thereto.

LESSOR'S DISCLAIMER:  Lessee acknowledges and agrees that it has selected both
the Equipment of the type and quantity which is the subject of this Addendum and
the supplier from whom Lessor purchased the Equipment. LESSOR MAKES NO
REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED, AS TO THE DESIGN, COMPLIANCE
WITH SPECIFICATIONS, CONDITION, QUALITY, WORKMANSHIP, OR THE SUITABILITY,
ADEQUACY, OPERATION, USE OR PERFORMANCE OF THE EQUIPMENT OR AS TO ITS
MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. ANY DELAY IN DELIVERY
SHALL NOT AFFECT THE VALIDITY OF THE MASTER LEASE OR THIS ADDENDUM. The Lessee
understands and agrees that neither the supplier nor any salesman nor any agent
of the supplier is authorized to waive or alter any term or condition of the
Master Lease or this Addendum, and no representation as to the Equipment or any
other matter by the supplier shall in any way affect Lessee's duty to pay the
rent and perform its obligations as set forth in the Master Lease or this
Addendum. Lessor shall not be liable to Lessee for incidental, consequential, or
indirect damages or for any act, neglect, omission, breach or default by Lessor
or any third party.

LESSOR:                       LESSEE:
                              VITESSE MANUFACTURING & DEVELOPMENT CORPORATION, A
METLIFE CAPITAL               WHOLLY OWNED SUBSIDIARY OF VITESSE SEMICONDUCTOR
CORPORATION                   CORPORATION
                              -------------------------------------------------

BY: /s/ SCOTT RHODES          BY: /s/ EUGENE HOVANEC
    ----------------              ----------------------------
Its: VICE PRESIDENT           ITS: V. PRESIDENT
     ----------------              ---------------------------               
                              By:  /s/ Yatin Mody
                                   ---------------------------
                              Its: CONTROLLER / ASST SECRETARY
                                   ---------------------------



<PAGE>

                        LEASE PURCHASE CLOSING SCHEDULE

Lessee Name:                   Vitesse Manufacturing & Development Corporation 
                               -----------------------------------------------
Lease Purchase Addendum No:    One                                             
                               -----------------------------------------------
Dated:                         July 29, 1998                                    
                               -----------------------------------------------
Schedule Number:               One                                             
                               -----------------------------------------------
Closing Date:                  August 1, 1998                                  
                               -----------------------------------------------

1.    DESCRIPTION OF EQUIPMENT:

      New Semiconductor Manufacturing Equipment as shown on the attached Exhibit
      "A" hereby incorporated by this reference.

2.    LOCATION OF EQUIPMENT: (Lessee agrees that the Equipment will at all times
      remain in the possession and control of Lessee at the location(s)
      specified below, and will not be removed without Lessor's prior written
      consent.):
                           741 Calle Plano, Camarillo, CA 93012 and
                           4323 Arrows West Drive
                           Colorado Springs, CO 80907

3.    Tranche A Equipment Cost:    $2,606,534.24
                                   -------------------------
      Tranche B Equipment Cost:    $  651,633.56 
                                   -------------------------
          Total Equipment Cost:    $3,258,167.80
                                   -------------------------           

4.    PERIODIC RENT: As per Addendum No. 1 Particular Lease Terms section with
      the assumed original balance on Tranche A of interest only payments at a
      rate equal to 2% per annum on an assumed original balance of 
      $2,606,534.24, and: 
      Tranche B Level Payments for the first twelve months of the Lease shall 
      be $3,812.06; with annual adjustments calculated per Addendum No. 1, 
      Certain Definitions and Stipulations section.

5.    PURCHASE: As per Addendum No. 1 End of Term Provisions section

6.    INSURANCE REQUIRED: (All policies to require at lease 10 days' notice of
      cancellation to Lessor)
      a. Combined Single Limit Liability, including bodily injury and property
      damage, of not less than $20,000,000.00         naming Lessor as 
                               ----------------------
      additional insured. 
      b. All risk physical damage, including burglary and theft, for the full
      replacement value of the Equipment, based on the original equipment cost
      of $ 3,258,167.80          and Loss Payable Endorsement naming Lessor as
         -----------------------
      loss payee.

7.    EARLY TERMINATION: As per Addendum No. 1 Early Purchase or Sale/Yield
      Maintenance Premium section

8.    STIPULATED LOSS VALUE:
                  During the Basic Term and any Renewal Term:    $3,258,167.80

           such terms are defined in the Lease Purchase Addendum No. One
           --------------------------------------------------------------

Accepted and agreed this 29/th/ day of July, 1998, as Schedule No. One to that
certain Master Lease Purchase Agreement dated July 9, 1998 by and between the
parties hereto.

LESSOR:                               LESSEE:
                                         
                                      VITESSE MANUFACTURING & DEVELOPMENT
                                      CORPORATION, a wholly owned subsidiary of
METLIFE CAPITAL CORPORATION           VITESSE SEMICONDUCTOR CORPORATION
 
By:                                   By:
          /S/ Scott Rhodes                      /s/ Yatin Mody
       ---------------------------          ---------------------------------
              Scott Rhodes

Its           Vice President          Its       CONTROLLER/ASST. SECRETARY
       ---------------------------          --------------------------------- 






<PAGE>
 

                                  EXHIBIT "A"
                TO THE LEASE PURCHASE CLOSING SCHEDULE NO. ONE

<TABLE> 
<CAPTION> 
TOKYO ELECTRON LIMITED
3-6, AKASAKA 5-CHOME
MINATO-KU,TOKYO 107-8481, JAPAN
<S>                              <C>                           <C> 
INVOICE #IV1358501
One (1)                          P-8 Full Auto Prober          S/N PA05315


INVOICE #IV1358502
One (1)                          P-8 Full Auto Prober          S/N PA05415

INVOICE #IV1358503
One (1)                          P-8 Full Auto Prober          S/N PA05409


SCHLUMBERGER TECHNOLOGIES
1601 TECHNOLOGY DRIVE
SAN JOSE, CA 95110-1397


INVOICE #163091

One (1)                          SX-l00 Automated Test System     S/N 93136 
                                 Sub local memory - 192 pins, DPS Option, 
                                 Option HCDPS Mech Ready, Option Fail Capture Memory, 
                                 H V heat exchanger 60 hz, assy, power cond, exa, 58KVA, DC
                                 Ethernet thin add-on, GPIB/IEEE.488.I/F. Option 
                                 Parallel interface option, RSZ32 Fiber Opticserial I/F, 
                                 LM, HCKPS Expansion Option, LM, HCKPS Cal/Ver Loadboard

INVOICE #168812

One (1)                          SX-l00 Automated Test System    S/N 93143 
                                 DPS Option, Option 
                                 HCDPS Mech Ready, Option Fail Capture Memory, 
                                 H V heat exchanger 60 hz, assy, power cond, exa, 58KVA, DC 
                                 Ethernet thin add-on, GPIB/IEEE.488.I/F. Option 
                                 Parallel interface option, RSZ32 Fiber Opticserial I/F
                                                                                                    YM
                                                                                               ------------
                                                                                                 Initial

                                                                                               ------------ 
                                                                                                 Initial

                                                                                                    SR
                                                                                               ------------ 
                                                                                                 Initial
</TABLE> 
<PAGE>

                                                                  August 1, 1998
 $2.606.534.24                                              Bellevue. Washington
 -------------                                              --------------------


                                PROMISSORY NOTE
                       RE: ADDENDUM NO. ONE ("ADDENDUM")


          FOR VALUED RECEIVED, MetLife Capital Corporation ("Maker"), promises
to pay to the order of Vitesse Manufacturing & Development Corporation, a wholly
owned subsidiary of Vitesse Semiconductor Corporation ("Payee"), at its office
at 741 Calle Plano, Camarillo, California 93012, the principal sum of Two
Million Six Hundred Six Thousand Five Hundred Thirty-Four Dollars and Twenty-
Four Cents ($2,606,534.24) together with interest on unpaid principal, subject
to the other provisions contained herein, from the date hereof until the
principal has been repaid in full at a rate of two percent (2%) per annum
("Rate") computed on the basis of a 360-day year of twelve consecutive thirty-
day months. Maker shall make monthly payments of interest only on the unpaid
principal commencing on August 1, 1998 and monthly thereafter on the 1/st/ day
of each month until the Maturity Date, as defined below, at which time the
entire principal and any accrued interest remaining unpaid shall be due and
payable.

          The "Maturity Date" is (A) if Payee prepays all of its obligations
under Addendum No. One (the "Addendum") to that certain Master Lease Purchase
Agreement (the "Lease") dated July 8, 1998 between Payee and Maker, then the
Maturity Date shall be the date on which Payee prepays, and (B) if Payee does
not prepay all of its obligations under the Addendum, then the Maturity Date
shall be the later of (1) June 1, 2002 or (2) the date on which Payee has
performed all of its obligations to Maker under the Addendum and Maker.
Notwithstanding the foregoing, Maker may prepay the entire balance of the Note
at any time without penalty or premium.

          No interest shall accrue hereunder for any period during which
interest is not accruing under the Addendum. If Payee fails to make any payment
that is required to be made to Maker under the Lease, Maker shall have the right
to set-off such amount against Maker's obligations under this Note without
notice to or the consent of Payee and without any obligation to confirm with
Payee in advance whether the set-off is valid. Nothing contained herein shall be
deemed to require Maker to set-off any amounts owed hereunder and Payee
acknowledges and agrees that Maker shall have no such set-off obligation. Payee
expressly waives any right it may have to require Maker to give any notice of
intent to set-off and waives any right to prohibit any set-off on any grounds;
provided, however, that the foregoing waiver shall not be construed as limiting
- -----------------
any legal right Payee may have to challenge any set-off after the fact. If Maker
elects to exercise its set-off rights, the principal amount outstanding
hereunder shall be immediately reduced by the amount of the set-off. Maker shall
notify Payee of any set-off and the amount thereof, but if Maker fails to notify
Payee, such failure shall not affect or invalidate Maker's right to the set-off.

           If Payee does not receive any payment on the date due, then, unless
Maker's failure to make such payment was a result of Maker exercising its
set-off rights, Maker will pay Payee a late charge of five percent (5%) of the
payment outstanding together with the payment and, provided said sum is received
within ten (10) days of the date due, Payee agrees not to demand immediate
payment of the whole sum of principal and interest as otherwise permitted
herein.

           If, from any circumstances whatsoever, payment of any obligation due
under this Note at the time such performance shall be due shall involve
exceeding the maximum amount currently prescribed by any applicable usury
statute or any other applicable law, then such obligation shall be reduced to
such maximum amount, so that in no event shall any payment be possible under
this Note, or under any other instrument evidencing or securing the indebtedness
evidenced hereby, that is in excess of such maximum amount.

<PAGE>

         This Note shall be governed by and construed in accordance with the
laws of the State of Washington. No amendment to this Note shall be binding
unless it is in writing and duly signed by Maker and Payee.

         IN WITNESS WHEREOF, Maker has caused this Promissory Note to be
executed by its duly authorized representative on the date first set forth
above.

METLIFE CAPITAL CORPORATION

By /s/ Manuel G. Montanez
   ------------------------------
    Manual G. Montanez

Title:   Vice President
      ---------------------------     

VITESSE MANUFACTURING & DEVELOPMENT CORPORATION a wholly owned subsidiary of
VITESSE SEMICONDUCTOR CORPORATION hereby acknowledges and agrees to the terms of
the foregoing Promissory Note, including without limitation the terms regarding
set-off rights, waivers and abatement of interest.

VITESSE MANUFACTURING & DEVELOPMENT CORPORATION
A wholly owned subsidiary of VITESSE SEMICONDUCTOR CORPORPATION

By:/s/ YATIN MODY
   ------------------------------
   YATIN MODY

Title: Controller/Asst. Secretary
      ---------------------------

<PAGE>

                                                                    EXHIBIT 13.1
 
TABLE OF CONTENTS

letter to shareholders                                                         1

five-year selected financial data                                             10

quarterly results and stock market data                                       11

management's discussion and analysis of financial condition and results of
operations                                                                    12

independent auditors' report                                                  21

consolidated balance sheets                                                   22

consolidated statements of operations                                         23

consolidated statements of shareholders' equity                               24

consolidated statements of cash flows                                         25

notes to consolidated financial statements                                    26


letter to shareholders

December 1998

It is a pleasure to report to you that fiscal 1998 was our most successful year.
We continued to build on our strategy to focus our efforts on developing the
intellectual property expertise and the advanced process technology needed to be
the dominant supplier of high-performance integrated circuits (ICs) for the
communications and test equipment markets.

     Specific highlights for 1998 were:

     . Revenues exceeded $175 million, a 67% increase over the $105 million
       achieved in 1997.
     
     . Operating income grew to $57 million from $29 million in 1997, a 98%
       increase.
     
     . Earnings per share grew to $0.67 from $0.43 in 1997, a 56% increase,
       despite a twofold increase in the effective tax rate.
     
     . Bookings were strong throughout the year. Backlog grew to $103
       million from $62 million.

     . We successfully brought on line the Pierre Lamond Wafer Fabrication
       Facility -our new plant in Colorado Springs.
<PAGE>
 
In 1998, revenues increased by 67% over the prior year, principally from very
strong growth in our focus markets of telecommunications, data communications
and test equipment. Revenues increased sequentially by more than 10% each
quarter, and with the output from the new fab in Colorado Springs we were able
to make significant strides in meeting our customers' requirements.

The Colorado Springs facility is the world's first commercial six-inch GaAs
wafer fab. We began construction of this facility in November 1996, completed
the clean room by July 1997, and installed the initial equipment in September
1997. We started shipping the first products from this fab in March 1998 and are
currently continuing the production ramp to meet the growing needs of our
customers. With its current equipment set, the fab should be able to produce
approximately $200 million per year in incremental revenue. With additional
equipment and personnel, the capacity can be expanded to nearly $400 million. In
addition to generating the added manufacturing capacity, the use of six-inch
wafers and a very simple CMOS-like process and equipment set gives Vitesse a
considerable cost advantage over any of the bipolar processes such as ECL or
Silicon-Germanium. It is our goal to provide the highest performing technology
at a cost-effective price.

As a result of the strong revenue growth, both gross margins and operating
margins improved, resulting in a 98% increase in operating income and a 56%
increase in income per share, year over year. Due to continued cost controls,
operating expense grew at a rate lower than revenue, despite the addition of
over 145 personnel at the Colorado Springs facility.

Communications   Over the last few years, Vitesse has become one of the dominant
suppliers of physical layer ICs for high-performance optical fiber communication
systems. Vitesse telecommunication products are principally used in SONET/SDH
transmission systems. SONET/SDH is the international standard for high-speed
fiberoptic transmission that is used in the communication infrastructure by both
long-distance carriers and local operating companies. In 1998, SONET/SDH
applications represented approximately 51% of the Company's revenue. Industry
sources estimate that the market for physical layer SONET/SDH circuits will
increase from approximately $275 million in 1998 to over $600 million in 2001.
This growth is being driven by the need to add a nearly fivefold increase in
system bandwidth to accommodate the explosion of digital data transmission
resulting from increased use of the Internet, enterprise wide networking, remote
access and dedicated data lines. The need for system bandwidth is being
addressed in three ways: increased speed in each transmission channel,
transmitting multiple channels on a single fiber by a technique called
wavelength division multiplexing (WDM), and by installing additional fiber
cables. Today, most systems utilize the 2.5 Gb/s standard (OC48, STM16), and
initial shipments are being made with the 10 Gb/s standard (OC192, STM 48).
These data rates are beyond the capability of conventional silicon CMOS
technology and are a natural application where we can bring performance and
cost-effectiveness through the use of our GaAs technology. The widespread
adoption of WDM has enabled system operators to dramatically increase their
system bandwidth without the need to bury additional fiber cables, which is a
long and costly process. While WDM increases the bandwidth carried by each
optical fiber by a factor of 8 to 120, it does not reduce the number of
electronic components required. Instead, WDM has accelerated the growth of
SONET/SDH demand by eliminating fiber installation as a growth limiter. We have
instituted a number of actions to continue to grow our SONET business at a
faster rate than the market as a whole. These include:

 .    Increasing revenue per port through the integration of other analog
     components that are used in conjunction with our traditional multiplexers
     and demultiplexers. This can nearly double our revenue per port while
     significantly reducing system costs. In 1998, we introduced the VSC 816x
     family of highly integrated products and began initial shipments in the
     September quarter.

 .    Stimulating the growth of 10 Gb/s (OC 192) systems by dramatically reducing
     both die and package costs. The VSC 8073 and VSC 8074 should sample in
     early fiscal 1999.

 .    Increasing the addressed market by leveraging our system-level expertise
     and intellectual property developed over the last 10 years to provide
     circuits for other levels of the system architecture. While these products
     will most likely be built using a state-of-the-art CMOS process, they will
     be used by many of our existing customers who have had to either develop or
     fund custom designs.
<PAGE>
 
 .    Exploiting our unique highly integrated GaAs process technology to expand
     into other product segments of the communication IC market. In fiscal 1998,
     we sampled our first switching element IC that will enable a nearly tenfold
     improvement in performance for the same physical size switch. We plan to
     accomplish this by running each port of the switch at a 2.5 Gb/s data rate
     compared to 100-200 Mb/s in traditional CMOS implementations. The VSC 83x
     which sampled in fiscal 1998 is our first product in this area.

In 1998, we doubled our revenue in data communications markets. Datacom
applications now account for 23% of revenue. This dramatic increase in revenue
was a result of the production ramp in 1.06 Gb/s Fibre Channel products which
are used in a wide variety of high-speed applications, including serial SCSI
disk drives and disk arrays, backplanes in switches and routers and point-to-
point data links. In addition to Fibre Channel, 1998 saw a continuation in the
growth of Asynchronous Transfer Mode (ATM), 1000T Ethernet (Gigabit Ethernet)
and a number of datacom-oriented optoelectronic products.

We believe that ATM and Gigabit Ethernet will become the leading high-
performance private and Internet-related protocols over the next four years. To
support these markets, we introduced 18 new products in 1998. Among the new
products introduced were: a 4-channel 1.25 Gb/s backplane interconnect chip (VSC
7215), a 622 Mb/s ATM transceiver (VSC 8114), a 3.3V optical receiver for
Gigabit Ethernet (VSC 7809), a 2.5 Gb/s Mux/Demux Section Terminator chipset for
ATM/SDH/SONET applications (VSC 8025/VSC 8026) and a gigabit interconnect for
high-speed backplanes (VSC 7211).
<PAGE>
 
In datacom applications there is a need for a great variety of application
specific standard products to address the time-to-market needs of the equipment
suppliers. Our focus is to work closely with major equipment suppliers so that
we can bring these products to market in a timely fashion.

TEST EQUIPMENT   Our Automatic test equipment (ate) business grew rapidly in
1998 despite a downturn in ate capital purchases. We accomplished this by
continuing to gain market share at the expense of bipolar silicon by offering
products with higher speed, higher levels of integration, lower cost, and the
ability to combine logic, SRAM and analog functions. Moreover, trends in new
memory standards (RAMBUS) have opened up new applications that formerly did not
need the performance Vitesse provides.

the softness in ATE equipment spending will continue in fiscal 1999. while we
anticipate that our ate business will continue to grow, we do not expect it to
grow at the rapid pace of the past two years. To expand our opportunities we
have introduced our first standard products in ATE. These products are designed
for applications that may not require the higher performance provided by custom
designs and which cannot afford the longer design cycles and higher costs
associated with custom solutions.

MANUFACTURING   The single most important competitive advantage in the markets
we serve is our ability to manufacture very complex, very high-speed ICS using
GaAs as the semiconducting material. The Vitesse GaAs technology is based on
conventional CMOS equipment and techniques instead of the more common RF GaAs
technology used in low complexity circuits principally for wireless
applications. Over the past 10 years, our technology has matured and by
exploiting the advances made in CMOS equipment and technology, it has enabled us
to achieve a substantial cost and performance advantage over any of the older
and obsolete (at least for VLSI digital and mixed signal applications) silicon
bipolar technologies, which suffer from greater manufacturing complexity, larger
die size and higher power. The addition of our six-inch fab in Colorado Springs
only extends this advantage.
<PAGE>
 
This Class 1 fab will further improve our competitive position through the use
of six-inch wafers compared to four-inch wafers used in our Camarillo facility.
Six-inch wafers will more than double the number of available die per wafer
thereby significantly decreasing die costs. Moreover, the equipment used in
Colorado Springs is state-of-the-art silicon equipment, which will be capable of
supporting 0.25 micron or better design rules. this will allow future products
and selected current products to have a smaller die size and thus more available
die per wafer.

BALANCE SHEET IMPROVEMENT in 1998, we continued to improve our balance sheet
through management of inventory and accounts receivable. in addition, we
generated over $51 million in cash from operations. We ended 1998 with $162
million in cash and investments, an increase of $6.5 million over 1997, despite
the significant Investment in our Colorado Springs facility.

SUMMARY in 1998, we exceeded our growth level in 1997, continuing the strategy
set forth in the 1994 Annual Report. While it is impossible to predict every
opportunity that might arise, we believe we have selected outstanding growth
opportunities that are well matched to our technology and expertise.

Moreover, our employees have continued to focus on making Vitesse a leading
supplier of high-performance circuits for communications and instrumentation. We
greatly appreciate your support and remain fully committed to making Vitesse an
outstanding company and an outstanding investment.


LOUIS R. TOMASETTA

President

Chief Executive Officer
<PAGE>
 
five-year selected financial data

<TABLE> 
<CAPTION> 
                                                                Year Ended September 30,
                                               1998         1997         1996       1995        1994
- ---------------------------------------------------------------------------------------------------------
(in thousands except per share amounts)                                                 
<S>                                        <C>          <C>          <C>         <C>        <C>
Operating Results                                                                       
 Revenues                                  $175,082     $104,850     $ 66,046    $42,882    $35,581
 Income (loss) from operations               56,756       28,662       13,432      2,788     (3,233)
 Net income (loss)                           52,873       32,888       12,645      1,507     (4,141)
 Net income (loss) per share - diluted         0.67         0.43         0.21       0.03      (0.09)
Balance Sheet                                                                           
 Cash and short-term investments            162,294      155,844       52,436      6,315      5,171
 Working capital                            215,309      177,468       70,215     17,889     14,644
 Total assets                               368,411      292,280      100,416     42,111     39,496
 Long-term debt, less current portion             -            -          406      5,518      6,029
 Net shareholders' equity                   340,688      265,102       88,370     25,000     21,517
</TABLE>
<PAGE>
 
quarterly results and stock market data [unaudited]

<TABLE> 
<CAPTION> 
                                                 First     Second      Third     Fourth       Total
                                                Quarter    Quarter    Quarter    Quarter       Year
- -------------------------------------------------------------------------------------------------------
(in thousands except stock price and per share amounts)                                  
<S>                                             <C>        <C>        <C>        <C>         <C>
Fiscal Year 1998                                                                         
Revenues                                         $34,701    $40,212    $46,108    $54,061    $175,082
 Net income                                       10,379     12,056     13,927     16,511      52,873
 Net income per share - diluted (A)                 0.13       0.15       0.18       0.21        0.67
 Common stock price range (B):                                                           
  High                                             26.06      25.44      30.88      36.31       36.31
  Low                                              16.44      18.59      23.11      23.38       16.44
Fiscal Year 1997                                                                         
 Revenues                                        $21,832    $24,562    $27,607    $30,849    $104,850
 Net income                                        6,003      7,782      8,955     10,148      32,888
 Net income per share - diluted (A)                 0.09       0.10       0.12       0.13        0.43
 Common stock price range (B):                                                           
  High                                             16.59      18.29      18.50      26.94       26.94
  Low                                              10.42      11.25      13.75      16.07       10.42
Fiscal Year 1996                                                                         
Revenues                                         $14,022    $15,628    $17,274    $19,122    $ 66,046
 Net income                                        1,778      2,562      3,788      4,517      12,645
 Net income per share - diluted (A)                 0.04       0.05       0.06       0.07        0.21
 Common stock price range (B):                                                           
  High                                              4.63       5.28      11.29      14.38       14.38
  Low                                               3.54       3.46       6.00       7.00        3.46
</TABLE>

(A)  Net income per share computations for each quarter are independent and may
not add to the net income per share computation for the year.

(B)  The Company's common stock is traded on the Nasdaq National Market System
under the symbol VTSS. At September 30, 1998, there were approximately 758
shareholders of record. Common stock prices are closing prices as reported on
the Nasdaq National Market System. All share and per share data for all periods
presented have been adjusted to reflect a 2 for 1 stock split of the common
stock that was effected on May 26, 1998, and a 3 for 2 stock split of the common
stock that was effected on February 28, 1997. The Company has never paid cash
dividends and has no present plans to do so. The Company's bank line of credit
agreement and synthetic lease agreements prohibit the payment of dividends
without the banks' consent. See Notes 5 and 11 of Notes to Consolidated
Financial Statements.
<PAGE>
 
management's discussion and analysis of financial condition and results of
operations

The following discussion of the financial condition and results of operations of
the Company should be read in conjunction with the Consolidated Financial
Statements and Notes thereto included elsewhere in this Annual Report. The
information set forth in "Management's Discussion and Analysis of Financial
Condition and Results of Operations" below includes "forward-looking statements"
within the meaning of Section 27A of the Securities Act of 1933 as amended and
Section 21E of the Exchange Act that involve risks and uncertainties. Factors
that realistically could cause results to differ materially from those projected
in the forward-looking statements are set forth in "Management's Discussion and
Analysis of Financial Condition and Results of Operations" and "Factors
Affecting Future Operating Results."

Overview

The Company is a leader in the design, development, manufacturing and marketing
of digital GaAs ICs. The Company's target customers are systems manufacturers in
the telecommunications, data communications and automatic test equipment (ATE)
markets. As a result of the deployment of communications standards such as
SONET/SDH, ATM, Fibre Channel and Gigabit Ethernet as well as other advances,
there has been growing demand for high-performance ICs to meet the increasingly
rigorous standards of the telecommunications and data communications industries.
The requirements for high-performance ICs in the ATE industry have also become
more stringent in order to meet testing requirements of increasingly faster and
more complex ICs. In fiscal 1998, sales of telecommunications, data
communications and ATE products represented 51%, 23% and 26%, respectively, of
the Company's total revenues.

The Company generates both production revenues and development revenues.
Production revenues are generally recognized upon shipment of the product, and
costs associated with production are included in cost of revenues. Development
revenues are much less significant and are generally recognized upon attainment
of milestones established under customer contracts, such as the release or
shipment of the Company's cell library or design tools, the release by the
customer of a design net list or design tape and the Company's shipment of
prototype ICs. The majority of costs associated with development revenues,
including prototype fabrication costs, are included in cost of revenues, and the
remaining portion is expensed as engineering, research and development expenses.
The Company believes such revenues will continue to decline as a percentage of
total revenues in the foreseeable future.

The Company has focused its sales efforts on a relatively small number of
systems manufacturers who require high-performance ICs. Sales to the Company's
10 largest customers represented approximately 69%, 77% and 75% of total
revenues in fiscal 1998, 1997 and 1996, respectively.
<PAGE>
 
As of September 30, 1998, the Company had $22.5 million and $10.0 million of
federal and state net operating loss carryforwards, respectively, which will be
recoverable only if future taxable income is sufficient to utilize such tax loss
carryforwards. Based on historical results of operations, estimated future
taxable income and other factors, management believes that it is more likely
than not that the tax benefits associated with such loss carryforwards will be
realized, and therefore the Company has eliminated the valuation allowance for
all deductible differences. In 1997 and 1998, recognition of the Company's net
operating loss carryforward benefits resulted in relatively low effective income
tax rates for the Company. This reduction of the available future benefit
related to these net operating loss carryforwards will result in the Company
experiencing higher effective income tax rates in fiscal 1999 and thereafter.
See Note 8 of Notes to Consolidated Financial Statements.

Results of Operations

The following table sets forth statements of operations data of the Company
expressed as a percentage of total revenues for the fiscal years indicated:

<TABLE>
<CAPTION>
                                                                           Year Ended September 30,
                                                                     1998            1997          1996
<S>                                                                 <C>             <C>           <C>
Revenues                                                            100.0%          100.0%        100.0%
- ------------------------------------------------------------------------------------------------------------ 
Costs and expenses:                                                                            
 Cost of revenues                                                    39.6            43.4          48.1
 Engineering, research and development                               16.0            16.0          16.7
 Selling, general and administrative                                 12.0            13.2          14.9
- ------------------------------------------------------------------------------------------------------------ 
   Total costs and expenses                                          67.6            72.7          79.7
- ------------------------------------------------------------------------------------------------------------ 
Income from operations                                               32.4            27.3          20.3
Other income, net                                                     5.3             7.5           0.9
- ------------------------------------------------------------------------------------------------------------ 
Income before income taxes                                           37.7            34.8          21.3
Income taxes                                                          7.5             3.5           2.1
Net income                                                           30.2%           31.4%         19.1%
- ------------------------------------------------------------------------------------------------------------ 
</TABLE>
<PAGE>
 
Year Ended September 30, 1998, as Compared to Year Ended September 30, 1997

Revenues   Revenues in fiscal 1998 were $175.1 million, a 67% increase over the
$104.9 million recorded in fiscal 1997. The increase in total revenues was due
to an increase in production revenues as a result of the growth in shipments to
customers in the communications and ATE markets.

Cost of Revenues   Cost of revenues as a percentage of total revenues in fiscal
1998 was 39.6% compared to 43.4% in fiscal 1997. The decrease in cost of
revenues as a percentage of total revenues resulted primarily from a reduction
in per unit costs associated with increased utilization of the Camarillo wafer
fabrication facility, as well as improved manufacturing yields, partially offset
by an increase in per unit costs associated with the Colorado facility which did
not start volume production until the third quarter of fiscal 1998.

Engineering, Research and Development   Engineering, research and development
expenses were $27.9 million in fiscal 1998 compared to $16.8 million in fiscal
1997. The increase was principally due to increased headcount and higher costs
to support the Company's continuing efforts to develop new products. The
Company's engineering, research and development costs are expensed as incurred.
The Company intends to continue to increase the dollar amount of engineering,
research and development expenses in the future. As a percentage of total
revenues, engineering, research and development expenses were 16% in fiscal 1998
and 1997.

Selling, General and Administrative   Selling, general and administrative
expenses were $21.1 million in fiscal 1998 compared to $13.9 million in fiscal
1997. The increase was principally due to increased headcount, higher
commissions earned by sales representatives resulting from increased sales, and
increased advertising costs. As a percentage of total revenues, selling, general
and administrative expenses declined to 12.0% in fiscal 1998 from 13.2% in
fiscal 1997 primarily as a result of the Company's revenues growing faster than
these expenses.

Other Income, Net   Other income consists of interest income, net of interest
and other expenses. Other income increased to $9.2 million in fiscal 1998 from
$7.9 million in fiscal 1997 due to a higher average cash, short-term investments
and long-term deposit balances in fiscal 1998 as compared to fiscal 1997
resulting primarily from the Company's equity offering in November 1996.

Income Taxes   The Company recorded a provision for income taxes in the amount
of $13.1 million in fiscal 1998 and $3.7 million in fiscal 1997, representing an
effective tax rate of 20% and 10%, respectively. The Company expects its
effective tax rate to increase significantly in fiscal 1999 as a result of
utilization in previous years of available net operating loss carryforwards.

Net Operating Loss Carryforwards   As of September 30, 1998, the Company had
federal net operating loss carryforwards of approximately $22.5 million, state
net operating loss carryforwards of approximately $10.0 million and federal and
state research and development tax credits of approximately $3.6 million and
$1.4 million, respectively. The Company accounts for income taxes pursuant to
the provisions of Statement of Financial Accounting Standards No. 109,
"Accounting for Income Taxes" (SFAS No. 109).
<PAGE>
 
Year Ended September 30, 1997, as Compared to Year Ended September 30, 1996

Revenues   Revenues in fiscal 1997 were $104.9 million, a 59% increase over the
$66.0 million recorded in fiscal 1996. The increase in revenues was due to an
increase in production revenues as a result of the growth of shipments to
customers in the data communications, telecommunications and ATE markets.

Cost of Revenues   Cost of revenues as a percentage of total revenues in fiscal
1997 was 43.4% compared to 48.1% in fiscal 1996. The decrease in cost of
revenues as a percentage of total revenues resulted from a reduction in per unit
costs associated with increased production as well as increased manufacturing
yields at the Camarillo manufacturing facility.

Engineering, Research and Development Engineering, research and development
expenses were $16.8 million in fiscal 1997 compared to $11.0 million in fiscal
1996. The increase was principally due to increased headcount and higher costs
to support the Company's continuing efforts to develop new products. As a
percentage of total revenues, engineering, research and development expenses
declined to 16.0% in fiscal 1997 from 16.7% in fiscal 1996 due primarily to the
Company's revenues growing faster than these expenses.

Selling, General and Administrative   Selling, general and administrative
expenses were $13.9 million in fiscal 1997 compared to $9.8 million in fiscal
1996. This increase was principally due to increased headcount, salary
increases, higher commissions resulting from increased sales and increased
advertising costs. As a percentage of total revenues, selling, general and
administrative expenses declined to 13.2% in fiscal 1997 from 14.9% in fiscal
1996 primarily as a result of the Company's revenues growing faster than these
expenses.

Other Income, Net  Other income consists of interest income, net of interest and
other expenses. Other income increased to $7.9 million in fiscal 1997 from $0.6
million in fiscal 1996 due to a higher average cash balance in fiscal 1997 as
compared to fiscal 1996 resulting primarily from the Company's equity offerings
in March 1996 and November 1996.

Income Taxes   The Company recorded a provision for income taxes in the amount
of $3.7 million in fiscal 1997 and $1.4 million in fiscal 1996.

Liquidity and Capital Resources

Operating Activities   The Company generated $51.0 million, $55.2 million and
$16.7 million from operating activities in fiscal 1998, 1997 and 1996,
respectively.

Investing Activities   Capital expenditures, primarily for manufacturing and
test equipment, were $29.7 million, $30.7 million and $11.0 million in fiscal
1998, 1997 and 1996, respectively.
<PAGE>
 
As a result of increased demand for its products, the Company has been
increasing capacity at its Camarillo plant. Additionally, during the current
fiscal year the Company purchased manufacturing equipment in order to begin
volume production of six-inch wafers at its wafer fabrication facility in
Colorado Springs. Consequently, the Company incurred a significant increase in
capital expenditures in fiscal 1998 and 1997. The majority of the costs
associated with the Colorado Springs facility was financed through three
operating lease transactions. See Note 11 of Notes to Consolidated Financial
Statements. The Company intends to continue investing in new manufacturing, test
and engineering equipment.

Financing Activities   In fiscal 1998, the Company generated $8.3 million of
cash from financing activities consisting of $8.5 million of proceeds from the
issuance of common stock pursuant to the Company's stock option and stock
purchase plans, partially offset by $0.3 million in repayments of debt
obligations. In fiscal 1997, the Company generated $124.5 million of cash from
financing activities consisting of $125.4 million of proceeds from the issuance
and sale of common stock in the Company's public offering in November 1996 and
proceeds from the issuance of common stock pursuant to the Company's stock
option and stock purchase plans partially offset by $0.9 million in repayments
of debt obligations.

The Company has an agreement with a bank for a revolving line of credit which
expires on January 5, 1999. The maximum amount available under the revolving
line of credit is $12.5 million. The interest rate on borrowings under this
revolving line of credit is equal to the bank's prime rate. See Note 5 of Notes
to Consolidated Financial Statements.

Management believes that the Company's cash and cash equivalents, short-term
investments, cash flow from operations and revolving line of credit agreement
are adequate to finance its planned growth and operating needs for the next 12
months.

In 1998, the Company entered into an operating lease transaction providing for
the financing of $10 million for the acquisition of certain test equipment.
Payments under this lease began in fiscal 1998. If at the end of the lease term
the Company does not purchase the property, the Company would guarantee a
residual value to the lessor equal to a specified percentage of the lessor's
cost of the facility and equipment. See Note 11 of Notes to Consolidated
Financial Statements.


Impact of Recent Accounting Pronouncements

In June 1997, the Financial Accounting Standards Board issued SFAS No. 130,
"Reporting Comprehensive Income." SFAS No. 130 establishes standards for
reporting and display of comprehensive income and its components (revenues,
expenses, gains and losses) in a full set of general-purpose financial
statements. SFAS No. 130 is effective for fiscal years beginning after December
15, 1997. The Company has determined that the impact of adopting the standard
will not be material to the financial position or results of operations of the
Company.
<PAGE>
 
In June 1997, the Financial Accounting Standards Board issued SFAS No. 131,
"Disclosures about Segments of an Enterprise and Related Information." SFAS No.
131 establishes standards for the reporting of operating segment information in
annual financial statements and in interim financial reports issued to
shareholders. SFAS No. 131 is effective for fiscal years beginning after
December 15, 1997. Adoption of this standard will result only in additional
disclosures.

Factors Affecting Future Operating Results

Customer and Industry Concentration   The Company is, and intends to continue,
focusing its sales efforts on a relatively small number of companies in the
telecommunications, data communications and ATE markets that require high-
performance ICs. Certain of these companies are also competitors of Vitesse. In
fiscal 1998, two customers accounted for 23% and 15% of total revenues.

Variability of Quarterly Results   The Company's quarterly results of operations
have varied significantly in the past and may continue to do so in the future.
These variations have been due to a number of factors, including the loss of
major customers, variations in manufacturing yields, the timing and level of new
product and process development costs, changes in inventory levels, changes in
the type and mix of products being sold, changes in manufacturing capacity and
variations in the utilization of this capacity, and customer design changes,
delays or cancellations. From time to time, the Company has also incurred
significant new product and process development costs due to the Company's
policy of expensing costs as incurred relating to the manufacture of new
products and the development of new process technologies. There can be no
assurance that the Company will not incur such charges or experience revenue
declines in the future.

Manufacturing Capacity Limitations; New Production Facility   During 1998, the
Company began volume commercial production at its six-inch wafer fabrication
facility in Colorado Springs, Colorado. The facility includes a 10,000-square-
foot Class 1 clean room with capacity for future expansion to 15,000 square
feet. The successful continued operation of the new wafer fabrication facility,
as well as the Company's overall production operations, will be subject to
numerous risks. The Company has limited experience with the operation of
equipment or the processes involved in producing finished six-inch wafers. The
Company does not have excess production capacity at its Camarillo facility to
offset any failure of the new facility to meet planned production goals. As a
result of these and other factors, the failure of the Company to continue
successful operation of the new wafer fabrication facility could have a material
adverse effect on its business, operating results or financial condition. The
Company will also have to effectively coordinate and manage the Colorado Springs
and Camarillo facilities to successfully meet its overall production goals. The
Company has limited experience in coordinating and managing full-scale
production facilities that are located at different sites. The failure to
successfully coordinate and manage the two sites could adversely affect the
Company's overall production and could have a material adverse effect on its
business, operating results or financial condition.
<PAGE>
 
Competition   The high-performance semiconductor market is highly competitive
and subject to rapid technological change, price erosion and heightened
international competition. The communications and ATE industries, which are
primary target markets for the Company, are also becoming intensely competitive
because of deregulation and heightened international competition, among other
factors. The Company currently competes against other GaAs fabrication
operations of systems companies, such as Rockwell, and Silicon IC manufacturers
employing ECL and BiCMOS technologies such as Fujitsu, Hewlett-Packard,
Motorola, National Semiconductor, Texas Instruments and Applied Micro Circuits
Corporation. Many of these companies have significantly greater financial,
technical, manufacturing and marketing resources than the Company. In addition,
in lower-frequency applications, the Company faces increasing competition from
CMOS-based products, particularly as the performance of such products continues
to improve.

Competition in the Company's markets for high-performance ICs is primarily based
on price/performance, product quality and the ability to deliver products in a
timely fashion. Some prospective customers may be reluctant to adopt Vitesse's
products because of perceived risks relating to GaAs technology. In addition,
product qualification is typically a lengthy process and certain prospective
customers may be unwilling to invest the time or incur the costs necessary to
qualify suppliers such as the Company. Prospective customers may also have
concerns about the relative speed, complexity and power advantages of the
Company's products compared to more familiar ECL or BiCMOS semiconductors or
about the risks associated with relying on a relatively small company for a
critical sole-sourced component.

Asian Economic Issues   The Company's international business is subject to risks
customarily encountered in foreign operation, including the recent financial
turmoil in Asia. Although management believes the financial turmoil in Asia will
not have a material impact on the financial statements, there can be no
assurance that the Company will not be affected by such economic issues in Asia.

Product and Process Development and Technological Change   The market for the
Company's products is characterized by rapid changes in both product and process
technologies. The Company believes that its future success will depend, in part,
upon its ability to continue to improve its product and process technologies and
develop new technologies in order to maintain its competitive position, to adapt
its products and processes to technological changes and to adopt emerging
industry standards. There can be no assurance that the Company will be able to
improve its product and process technologies and develop new technologies in a
timely manner or that such improvements or developments will result in products
that achieve market acceptance. The failure to successfully improve its existing
technologies or develop new technologies in a timely manner could adversely
affect the Company's business, operating results and financial condition.
<PAGE>
 
Dependence on Third Parties   The Company depends on third parties for
performing certain processes and providing a variety of components and materials
necessary for the production of its H-GaAs ICs. A majority of the Company's ICs
are packaged in plastic by third parties since the Company has no internal
capability to perform such plastic packaging. The balance of the Company's ICs
are packaged in its Camarillo facility using customized ceramic packaging which
is presently sole sourced. Other components and materials for H-GaAs ICs are
available from only a limited number of sources. The inability to obtain
sufficient sole- or limited-source services or components as required could
result in delays or reductions in product shipments which could adversely affect
the Company's business, operating results and financial condition.

Variability of Manufacturing Yields   The Company's manufacturing yields vary
among products, depending on a particular IC's complexity and the Company's
experience in manufacturing it. Historically, the Company has experienced
difficulties achieving acceptable yields on some ICs, which has resulted in
shipment delays. The Company's overall yields are lower than yields experienced
in a silicon process because of the large number of different products
manufactured in limited volume and because the Company's H-GaAs process
technology is significantly less developed. The Company expects that many of its
current and future products may never be produced in volume.

Regardless of the process technology used, the fabrication of semiconductors is
a highly complex and precise process. Defects in masks, impurities in the
materials used, contamination of the manufacturing environment, equipment
failure and other difficulties in the fabrication process can cause a
substantial percentage of wafers to be rejected or numerous die on each wafer to
be nonfunctional.

Because the majority of the Company's costs of manufacturing are relatively
fixed, maintenance of the number of shippable die per wafer is critical to the
Company's results of operations. Yield decreases can result in substantially
higher unit costs and may result in reduced gross profit and net income. As most
work-in-process inventory consists of wafers at various stages of fabrication,
the Company estimates yields per wafer in order to estimate the value of
inventory. If yields are materially different from projected, work-in-process
inventory may need to be revalued. There can be no assurance that the Company
will not suffer periodic yield problems in connection with new or existing
products, which could cause the Company's business, operating results and
financial condition to be materially adversely affected.

Environmental Regulations   The Company is subject to a variety of federal,
state and local government regulations related to the use, storage, discharge
and disposal of toxic, volatile or otherwise hazardous chemicals used in its
manufacturing process. Any failure to comply with present or future regulations
could result in the imposition of fines on the Company, the suspension of
production or cessation of operations. In addition, such regulation could
restrict the Company's ability to expand its operations at its present locations
or could require the Company to acquire costly equipment or to incur other
significant expenses to comply with governmental regulations or to clean up
prior discharges.
<PAGE>
 
Management of Growth   The management of the Company's growth requires qualified
personnel and systems. In particular, the operation of the Company's wafer
fabrication facility in Colorado Springs and its integration with the Company's
Camarillo facility require significant management, technical and administrative
resources. There can be no assurance that the Company will be able to manage its
growth or effectively integrate its Colorado Springs wafer fabrication facility,
and failure to do so could have a material adverse effect on the Company's
business, operating results or financial condition.

Dependence on Key Personnel   The Company's success depends in part upon
attracting and retaining the services of its managerial and technical personnel.
The competition for qualified personnel is intense. There can be no assurance
that the Company can retain its key managerial and technical employees or that
it can attract, assimilate or retain other skilled technical personnel in the
future, and failure to do so could have a material adverse effect on the
Company's business, operating results or financial condition.

Year 2000   The "Year 2000 Problem" is the result of computer programs being
written using two digits rather than four to define the applicable year. This
can affect both information technology (IT) and non-IT systems, as non-IT
systems typically include embedded technology such as microcontrollers.

The Company is evaluating and addressing Year 2000 issues associated with its IT
and non-IT systems. Many of the IT and non-IT systems are compliant. 'ther
systems, which have been identified as noncompliant, are planned to be replaced
or upgraded. Certain non-IT systems in Vitesse's manufacturing facility have not
been fully evaluated for Year 2000 compliance. The Company anticipates that
remediation and testing will be substantially complete not later than July 1999
at a cost not material to the consolidated financial statements.

The Company's products have no specific date functions or date dependencies and
will operate according to specifications through the Year 2000 date rollover and
thereafter.

The Company may also be affected by customer or supplier Year 2000 issues. The
Company is contacting critical suppliers of products and services to determine
that the suppliers' operations and the products and services they provide are
Year 2000 compliant, or to monitor their progress toward Year 2000 compliance.

Management believes that Year 2000 issues will not materially impact the
Company's business, operating results or financial condition. The most
reasonably likely worst case would be minor delays in production and shipments.
The Company has not yet fully developed contingency plans to address any failure
of its Year 2000 risk assessment plan to identify and fully remediate any
significant risk to its ongoing operations. Development of contingency plans is
in progress and will be completed by July 1999.
<PAGE>
 
Independent auditors' report

The Board of Directors and Shareholders

Vitesse Semiconductor Corporation:

We have audited the accompanying consolidated balance sheets of Vitesse
Semiconductor Corporation and subsidiaries as of September 30, 1998 and 1997,
and the related consolidated statements of operations, shareholders' equity and
cash flows for each of the years in the three-year period ended September 30,
1998. These consolidated financial statements are the responsibility of the
Company's management. Our responsibility is to express an opinion on these
consolidated financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards 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. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the consolidated financial statements referred to above present
fairly, in all material respects, the financial position of Vitesse
Semiconductor Corporation and subsidiaries as of September 30, 1998 and 1997 and
the results of their operations and their cash flows for each of the years in
the three-year period ended September 30, 1998 in conformity with generally
accepted accounting principles.



KPMG PEAT MARWICK LLP

Los Angeles, California
October 14, 1998
<PAGE>
 
consolidated balance sheets

<TABLE>
<CAPTION>
September 30, 1998 and 1997                                                       September 30,
(in thousands, except share data)                                              1998           1997
- --------------------------------------------------------------------------------------------------------- 
<S>                                                                            <C>            <C>     
Assets                                                                                                
Current assets:                                                                                       
 Cash and cash equivalents                                                     $ 70,684       $ 97,358
 Short-term investments                                                          91,610         58,486
 Accounts receivable, net of allowance for doubtful accounts                                          
   of $1,000 in 1998 and 1997                                                    39,953         21,072
 Inventories, net                                                                16,795         11,809
 Prepaid expenses                                                                 3,008          1,121
 Deferred tax assets, net                                                        20,982         14,800
- --------------------------------------------------------------------------------------------------------- 
   Total current assets                                                         243,032        204,646
   ------------------------------------------------------------------------------------------------------ 
Property and equipment, net                                                      56,455         41,684
Restricted long-term deposits                                                    68,704         45,556
Other assets                                                                        220            394
- --------------------------------------------------------------------------------------------------------- 
                                                                               $368,411       $292,280
   ------------------------------------------------------------------------------------------------------ 

Liabilities And Shareholders' Equity                                                                  
Current liabilities:                                                                                  
 Accounts payable                                                              $ 13,898       $ 19,758
 Accrued expenses and other current liabilities                                  13,680          7,017
 Capital lease obligations and term loans                                           145            403

 Total current liabilities                                                       27,723         27,178
 -------------------------------------------------------------------------------------------------------- 

Commitments and contingencies                                                                         
Shareholders' equity:                                                                                 
 Preferred stock, $.01 par value. Authorized 10,000,000 shares; none issued                           
   or outstanding                                                                     -              -
 Common stock, $.01 par value. Authorized 100,000,000 shares; issued and                              
   outstanding 73,788,136 and 71,827,476 shares at September 30, 1998                                 
   and 1997, respectively                                                           738            718
 Additional paid-in capital                                                     299,503        276,810
 Retained earnings (accumulated deficit)                                         40,447        (12,426)
- --------------------------------------------------------------------------------------------------------- 
   Net shareholders' equity                                                     340,688        265,102
   ------------------------------------------------------------------------------------------------------ 
                                                                               $368,411       $292,280 
- --------------------------------------------------------------------------------------------------------- 
</TABLE>

See accompanying notes to consolidated financial statements.
<PAGE>
 
<TABLE>
<CAPTION>
consolidated statements of operations
Years ended September 30, 1998, 1997 and 1996                        Years ended September 30,
(in thousands, except per share data)                             1998          1997         1996
<S>                                                             <C>           <C>           <C>
Revenues                                                        $175,082      $104,850      $66,046
- -----------------------------------------------------------------------------------------------------

Costs and expenses:
 Cost of revenues                                                 69,352        45,500       31,792
 Engineering, research & development                              27,915        16,804       11,045
 Selling, general & administrative                                21,059        13,884        9,777
 ----------------------------------------------------------------------------------------------------
   Total costs and expenses                                      118,326        76,188       52,614
   --------------------------------------------------------------------------------------------------

Income from operations                                            56,756        28,662       13,432

Other income, net                                                  9,195         7,878          618
- -----------------------------------------------------------------------------------------------------

Income before income taxes                                        65,951        36,540       14,050
Income taxes                                                      13,078         3,652        1,405

Net income                                                      $ 52,873      $ 32,888      $12,645
- -----------------------------------------------------------------------------------------------------
Net income per share:
 Basic                                                          $   0.73      $   0.48      $  0.24
 Diluted                                                        $   0.67      $   0.43      $  0.21
 ----------------------------------------------------------------------------------------------------

Shares used in per share computations:
 Basic                                                            72,711        68,390       52,151
 Diluted                                                          79,219        75,703       59,613
 ----------------------------------------------------------------------------------------------------
</TABLE>

See accompanying notes to consolidated financial statements.
<PAGE>
 
consolidated statements of shareholders' equity

<TABLE>
<CAPTION>
                                                                                                      Retained
                                                                                      Additional      Earnings             Net
Years ended September 30, 1998, 1997 and 1996                      Common Stock          Paid-in  (Accumulated   Shareholders'
(in thousands, except share data)                               Shares       Amount      Capital       Deficit)         Equity
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                             <C>          <C>      <C>         <C>            <C>
Balance, October 1, 1995                                        46,529,274     $465    $ 82,494       $(57,959)       $ 25,000
Exercise of stock options                                        2,917,248       29       3,382              -           3,411
Exercise of warrants                                               170,830        2          13              -              15
Shares issued under Employee
 Stock Purchase Plan                                               322,230        3         972              -             975
Issuance of common stock,
 net of expenses                                                 8,280,000       83      46,241              -          46,324
Net income                                                               -        -           -         12,645          12,645
- ------------------------------------------------------------------------------------------------------------------------------------

Balance, September 30, 1996                                     58,219,582      582     133,102        (45,314)         88,370
Exercise of stock options                                        3,120,558       31       5,621              -           5,652
Shares issued under Employee
 Stock Purchase Plan                                               142,416        1       1,596              -           1,597
Issuance of common stock,
 net of expenses                                                10,350,000      104     118,094              -         118,198
Repurchase of fractional shares
 related to stock split                                             (5,080)       -          (3)             -              (3)
Tax benefit of disqualifying
 dispositions                                                            -        -      18,400              -          18,400
Net income                                                               -        -           -         32,888          32,888
- ------------------------------------------------------------------------------------------------------------------------------------

Balance, September 30, 1997                                     71,827,476      718     276,810        (12,426)        265,102
Exercise of stock options                                        1,843,297       19       6,258              -           6,277
Shares issued under Employee
 Stock Purchase Plan                                               117,363        1       2,239              -           2,240
Tax benefit of disqualifying
 dispositions                                                            -        -      14,196              -          14,196
Net income                                                               -        -           -         52,873          52,873

Balance, September 30, 1998                                     73,788,136     $738    $299,503       $ 40,447        $340,688
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE> 

See accompanying notes to consolidated financial statements.
<PAGE>
 
consolidated statements of cash flows

<TABLE>
<CAPTION>
Years ended September 30, 1998, 1997 and 1996                            Years ended September 30,
(in thousands)                                                         1998         1997        1996
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                   <C>        <C>         <C>
Cash flows from operating activities:
 Net income                                                           $ 52,873   $  32,888   $ 12,645
 Adjustments to reconcile net income to net cash provided
   by operating activities:
     Depreciation                                                       14,900       6,938      4,973
     Deferred tax assets                                                 8,010       3,600          -
 Changes in assets and liabilities:
     Receivables, net                                                  (18,881)     (2,453)    (5,889)
     Inventories, net                                                   (4,986)     (1,850)       (64)
     Prepaid expenses                                                   (1,887)       (280)      (299)
     Other assets                                                          174         275         98
     Accounts payable                                                   (5,860)     13,027      3,178
     Accrued expenses and other current liabilities                      6,664       3,039      2,094
     -------------------------------------------------------------------------------------------------------------------------------
        Net cash provided by operating activities                       51,007      55,184     16,736
        ----------------------------------------------------------------------------------------------------------------------------

Cash flows from investing activities:
 Short-term investments                                                (33,124)    (58,486)         -
 Restricted long-term deposits                                         (23,148)    (45,556)         -
 Capital expenditures                                                  (29,671)    (30,730)   (11,003)
- ------------------------------------------------------------------------------------------------------------------------------------
      Net cash used in investing activities                            (85,943)   (134,772)   (11,003)
- ------------------------------------------------------------------------------------------------------------------------------------

Cash flows from financing activities:
 Principal payments under capital lease obligations and term loans        (255)       (934)    (7,632)
 Proceeds from term loans                                                    -           -        245
 Repayments of short-term borrowings                                         -           -     (2,950)
 Net proceeds from issuance of common stock                              8,517     125,444     50,725
- ------------------------------------------------------------------------------------------------------------------------------------
      Net cash provided by financing activities                          8,262     124,510     40,388
      ------------------------------------------------------------------------------------------------------------------------------

Net increase (decrease) in cash and cash equivalents                   (26,674)     44,922     46,121
Cash and cash equivalents at beginning of year                          97,358      52,436      6,315
Cash and cash equivalents at end of year                              $ 70,684   $  97,358   $ 52,436
- ------------------------------------------------------------------------------------------------------------------------------------

Supplemental disclosures of cash flow information
 Cash paid during the year for:
   Interest                                                           $     35   $     165   $    656

   Income taxes                                                       $  1,703   $     296   $    347
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE> 

See accompanying notes to consolidated financial statements.
<PAGE>
 
notes to consolidated financial statements

Note 1 - The Company and Its Significant Accounting Policies

Description of Business  Vitesse Semiconductor Corporation was incorporated
under the laws of Delaware on February 3, 1987. Vitesse Semiconductor
Corporation is a leader in the design, development, manufacturing and marketing
of digital GaAs ICs.

Principles of Consolidation  The consolidated financial statements include the
accounts of Vitesse Semiconductor Corporation and its wholly-owned subsidiaries
(collectively, the Company). All significant intercompany accounts and
transactions have been eliminated in consolidation.

Revenue Recognition  Production revenue is recognized when products are shipped
to customers. Revenue from development contracts is recognized upon attainment
of specific milestones established under customer contracts. Revenue from
products deliverable under development contracts, including design tools and
prototype products, is recognized upon delivery. Costs related to development
contracts are expensed as incurred.

Cash Equivalents and Short-term Investments  The Company considers all highly
liquid investments with original maturities of three months or less to be cash
equivalents. Cash equivalents and short-term investments are principally
composed of money market accounts and obligations of the U.S. government and its
agencies. Pursuant to Statement of Financial Accounting Standards No. 115,
"Accounting for Certain Investments in Debt and Equity Securities" (SFAS No.
115), the Company classifies its securities included under short-term
investments as held-to-maturity securities, which are recorded at amortized
cost, adjusted for the amortization or accretion of premiums or discounts. As of
September 30, 1998 and 1997, carrying value was substantially the same as market
value.

Inventories  Inventories are stated at the lower of cost (determined by the
first-in, first-out method) or market (net realizable value). Costs associated
with the manufacture of a new product are charged to engineering, research and
development expense as incurred until the product is proven through testing and
acceptance by the customer. Inventories are shown net of a valuation reserve of
$4,155,000 and $3,121,000 at September 30, 1998 and 1997, respectively.

Depreciation  Depreciation of property and equipment is provided on the
straight-line method over the estimated useful lives of the related assets as
follows:

 Machinery and equipment      5 years
 Furniture and fixtures       5 years
 Computer equipment           3 years
 Leasehold improvements       Term of lease

Income Taxes  The Company accounts for income taxes pursuant to the provisions
of Financial Accounting Standards Board Statement No. 109. Under the asset and
liability method of Statement No. 109, deferred tax assets and liabilities are
recognized for the future tax consequences attributable to differences between
the financial statement carrying amounts of existing assets and liabilities and
their respective tax bases and operating loss and tax credit carryforwards.
<PAGE>
 
Research and Development Costs  The Company charges all research and development
costs to expense when incurred. Manufacturing costs associated with the
development of a new fabrication process or a new product are expensed until
such times as these processes or products are proven through final testing and
initial acceptance by the customer.

Costs related to revenues on nonrecurring engineering services billed to
customers are generally classified as cost of revenues; however, certain related
contract engineering and research costs are included in engineering, research
and development expense because these costs cannot be directly related to
individual contracts.

Computation of Net Income per Share  In February 1997, the Financial Accounting
Standards Board issued Statement of Financial Accounting Standards No. 128,
"Earnings per Share." SFAS No. 128 replaced the previously reported primary and
fully diluted earnings per share with basic and diluted earnings per share and
became effective for both interim and annual periods ending after December 15,
1997. Unlike primary earnings per share, basic earnings per share excludes any
dilutive effects of options and convertible securities. Diluted earnings per
share is very similar to the previously reported fully diluted earnings per
share. All earnings per share amounts for all periods presented have been
restated to conform to the SFAS No. 128 requirements.

The reconciliation of shares used to calculate basic and diluted income per
share consists of the following (in thousands):

<TABLE>
<CAPTION>
                                                    1998    1997    1996
- --------------------------------------------------------------------------------
<S>                                                <C>     <C>     <C>
Shares used in basic per share computations -
 weighted average shares outstanding               72,711  68,390  52,151
Net effect of dilutive common share equivalents
 based on treasury stock method                     6,508   7,313   7,462
- --------------------------------------------------------------------------------
Shares used in diluted per share computations      79,219  75,703  59,613
</TABLE>

Options to purchase 26,745 and 61,836 shares were outstanding at September 30,
1998 and 1997, respectively, but were not included in the computation of diluted
net income per share because the exercise price of the options was greater than
the average market price of the common shares, and therefore, the effect would
be antidilutive.

Financial Instruments  The Financial Accounting Standards Board's Statement of
Financial Accounting Standards No. 107, "Disclosures about Fair Value of
Financial Instruments," defines fair value of a financial instrument as the
amount at which the instrument could be exchanged in a current transaction
between willing parties. The Company's carrying value of cash equivalents, 
short-term investments, restricted long-term deposits, accounts receivable,
accounts payable, accrued expenses, capital lease obligations and term loans
approximates fair value because the instrument has a short-term maturity or
because the applicable interest rates are comparable to current borrowing rates
of those instruments.

Long-Lived Assets  In 1997, the Company adopted Statement of Financial
Accounting Standards No. 121, "Accounting for the Impairment of Long-Lived
Assets and for Long-Lived Assets to be Disposed of." This statement provides
guidelines for recognition of impairment of losses related to long-term assets.
The adoption of this new standard did not have a material effect on the
Company's financial statements.
<PAGE>
 
Accounting for Stock Options  In October 1995, Statement of Financial Accounting
Standards No. 123, "Accounting for Stock Based Compensation," was issued. This
statement encourages, but does not require, a fair value based method of
accounting for employee stock options. The Company has elected to continue to
measure and to recognize compensation costs under APB Opinion No. 25,
"Accounting for Stock Issued to Employees," and to adopt the disclosure-only
requirements of Statement No. 123.

Use of Estimates  Management of the Company has made a number of estimates and
assumptions relating to the reporting of assets and liabilities to prepare these
financial statements in conformity with generally accepted accounting
principles. Actual results could differ from those estimates.

Reclassifications and Restatements  Certain reclassifications have been made to
the prior year financial statements to conform to the current year presentation.

On April 22, 1998, the Company's Board of Directors announced a 2 for 1 stock
split of the common stock effected in the form of a stock dividend to
shareholders of record as of May 4, 1998. On January 29, 1997, the Company's
Board of Directors announced a 3 for 2 stock split of the common stock effected
in the form of a stock dividend to shareholders of record as of February 12,
1997. Accordingly, historical share and per share amounts have been restated to
reflect retroactively the stock splits.


Note 2 - Inventories

Inventories consist of the following:

<TABLE>
<CAPTION>
                                                                                            September 30,
                                                                                        1998           1997
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                           (in thousands)
<S>                                                                                     <C>           <C>
Raw materials                                                                            $ 2,949      $ 2,421
Work in process                                                                           10,561        6,762
Finished goods                                                                             3,285        2,626

                                                                                         $16,795      $11,809
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE> 

Note 3 - Property and Equipment

Property and equipment, stated at cost, are summarized as follows:

<TABLE> 
<CAPTION> 
                                                                                               September 30,
                                                                                           1998           1997
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                              (in thousands)
<S>                                                                                        <C>            <C> 
Machinery and equipment                                                                    $71,155        $53,807
Furniture and fixtures                                                                       1,424            747
Computer equipment                                                                          14,580         10,652
Leasehold improvements                                                                       6,880          4,423
Land                                                                                         1,039              -
- ------------------------------------------------------------------------------------------------------------------------------------

                                                                                             95,078        69,629
Less accumulated depreciation                                                                38,623        27,945

                                                                                            $56,455       $41,684
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

Included in property and equipment are items not yet placed in service of
$5,140,000 and $17,688,000 as of September 30, 1998 and 1997, respectively.
<PAGE>
 
Note 4 - Term Loans

The Company has various equipment term loans totaling $145,000 at September 30,
1998, bearing interest rates between 9% and 10% per annum payable in monthly
installments through fiscal 1999.

Note 5 - Revolving Line of Credit

The Company has a $12,500,000 revolving line of credit agreement with a bank,
which expires in January 1999. The agreement provides for interest to be paid
monthly at the bank's prime rate (8.5% on September 30, 1998). The Company must
adhere to certain requirements and provisions to be in compliance with the terms
of the agreement and is prohibited from paying dividends without the consent of
the bank. As of September 30, 1998 and 1997, no amounts were outstanding under
the line of credit.


Note 6 - Accrued Expenses

Accrued expenses consist of the following:

<TABLE>
<CAPTION>
                                                            September 30,
                                                         1998           1997
- --------------------------------------------------------------------------------
                                                           (in thousands)
<S>                                                      <C>            <C>
Accrued vacation                                         $ 1,231        $  756
Accrued salaries, wages and bonuses                        3,661         3,156
Accrued income taxes                                       4,199           825
Other                                                      4,589         2,280
                                                         $13,680        $7,017
- --------------------------------------------------------------------------------
</TABLE> 

Note 7 - Shareholder's Equity

Preferred Stock  In fiscal 1991, the Board of Directors authorized 10,000,000
shares of undesignated preferred stock. The Company has no present plans to
issue any of this preferred stock.

Common Stock  In 1998, the Company's shareholders approved an increase in the
number of authorized shares of common stock from 50,000,000 to 100,000,000.

Stock Option Plans  The Company currently has three stock option plans in place:
the 1987 Stock Option Plan, the 1989 Stock Option Plan and the 1991 Stock Option
Plan (collectively referred to as the "Plans"). The 1987 Stock Option Plan
expired in fiscal 1997 and consequently no additional options are available for
grant from this plan.

The 1989 Plan was adopted by the Board of Directors in April 1989 and approved
by the shareholders in April 1990. Pursuant to the 1989 Plan, 1,750,000 shares
of the Company's common stock were reserved for issuance.

The 1991 Plan was adopted by the Board of Directors and approved by the
shareholders in August 1991. Pursuant to the 1991 Plan the number of shares
reserved under the Plan automatically increases by a number of shares equal to
3.5% of the Company's common stock outstanding at the end of each fiscal year.
<PAGE>
 
The Plans provide for the granting of incentive stock options to employees of
the Company and for the granting of nonstatutory stock options to employees and
consultants of the Company. Options granted under the Plans generally vest and
become exercisable at the rate of 25% per year; however, certain options granted
prior to June 30, 1992, under the 1991 Plan and all of the options under the
1987 and 1989 Plans vest and become exercisable at the rate of 24% at the end of
the first year, and thereafter at a rate of 2% of the shares subject to the
options per month.

The exercise price of all incentive and nonstatutory stock options granted under
the Plans must be at least equal to the fair market value of the shares of
common stock on the date of grant. With respect to any participant who owns
stock possessing more than 10% of the voting power of all classes of stock of
the Company, the exercise price of any incentive stock option granted must equal
at least 110% of the fair market value on the grant date and, in the case of the
1991 Plan, the maximum term of such options must not exceed five years. The term
of all other options under the 1991 Plan and all options under the 1987 Plan and
1989 Plan may not exceed 10 years.

Under the 1987 Plan, the 1989 Plan and the 1991 Plan, as of September 30, 1998,
options to purchase an aggregate of 10,228,735 shares had been exercised,
options to purchase an aggregate of 10,294,601 shares were outstanding at a
weighted average exercise price of $10.19 per share and 191,812 shares (which
increased to 2,774,396 effective October 1, 1998, pursuant to the terms of the
1991 Plan) remained available for future grant. Of the 10,294,601 options
outstanding, 1,562,914 options were vested and exercisable under the Plans
pursuant to incentive stock options and 989,906 options were vested and
exercisable pursuant to nonstatutory stock options.

1991 Directors' Stock Option Plan  The 1991 Directors' Stock Option Plan (the
Directors' Plan) was adopted by the Board of Directors and approved by the
shareholders in August 1991. Pursuant to the Directors' Plan, 1,200,000 shares
have been reserved for issuance. As of September 30, 1998, 1,005,000 options had
been granted under the Directors' Plan; 559,200 of such grants had been
exercised and 97,200 had been canceled. At September 30, 1998, 130,800 options
were exercisable.

The Directors' Plan provides that each non-employee director automatically will
be granted a nonstatutory option to purchase 20,000 shares (except in the case
of the Chairman of the Board of the Company who shall receive an option to
purchase 30,000 shares) of common stock upon first becoming a director. In
addition, the Directors' Plan provides that each director serving on January 1
of each calendar year will automatically be granted a nonstatutory option to
purchase 20,000 shares (except in the case of the Chairman of the Board of the
Company who shall receive an option to purchase 30,000 shares) of common stock.
The options granted to the non-employee directors are for a 10-year term and
vest at the rate of 2% of the shares subject to the option at the end of each
month following the date of grant. The exercise price of the options may not be
less than the fair market value of the common stock on the last business day
prior to the date of grant of the option.
<PAGE>
 
 Activity under the 1987, 1989 and 1991 Plans and the 1991 Directors' Stock
 Option Plan is as follows:

<TABLE>
<CAPTION>
                                                                                   Number of               Option Price    
                                                                                    Shares          Per Share       Aggregate 
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                                              (in thousands)
<S>                                                                               <C>          <C>                  <C>            
Options outstanding at October 1, 1995                                             9,547,070    $  .01 -  3.89      $ 13,621   
Options:                                                                                                                         
 Granted                                                                           3,571,800      3.67 - 11.92        15,346   
 Exercised                                                                        (2,917,248)      .01 -  3.13        (3,411)  
 Canceled or expired                                                                (427,544)     1.21 -  4.63        (1,057)  
- ------------------------------------------------------------------------------------------------------------------------------------

Options outstanding at September 30, 1996                                          9,774,078       .01 - 11.92        24,499   
Options:                                                                                                                         
 Granted                                                                           3,096,402     10.42 - 25.25        38,977   
 Exercised                                                                        (3,120,558)      .01 - 14.07        (5,652)  
 Canceled or expired                                                                (142,824)     1.38 - 14.46          (959)  
- ------------------------------------------------------------------------------------------------------------------------------------

Options outstanding at September 30, 1997                                          9,607,098       .01 - 25.25        56,865   
Options:                                                                                                                         
 Granted                                                                           3,189,450     16.44 - 31.25        61,735   
 Exercised                                                                        (1,843,297)      .01 - 18.88        (6,277)  
 Canceled or expired                                                                (310,050)     1.50 - 28.19        (3,828)  
- ------------------------------------------------------------------------------------------------------------------------------------

Options outstanding at September 30, 1998                                         10,643,201    $  .05 - 31.25      $108,495    
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

The Company has adopted the disclosure-only provisions of Statement of Financial
Accounting Standards No. 123, "Accounting for Stock Based Compensation." The
Company used the Black-Scholes option pricing model to value stock options for
pro forma presentation. The assumptions used to estimate the value of options
under the various stock option plans and the shares under the Employee Stock
Purchase Plan are as follows:

<TABLE>
<CAPTION>
                                                             Employee
                                        Stock Option      Stock Purchase
                                         Plan Shares        Plan Shares
                                     1998         1997   1998         1997
- --------------------------------------------------------------------------------
<S>                                  <C>          <C>    <C>          <C> 
Average expected life (years)          5.39        5.45    0.50        0.50
Expected volatility                    0.51        0.55    0.51        0.55
Risk-free interest rate                4.40%       5.81%   4.22%       5.50%
Dividends                                 -           -       -           -
Weighted average fair values         $10.15       $7.07   $8.05       $5.13
</TABLE>

Pro forma compensation costs for fiscal 1998 and 1997 awards under the stock
option and stock purchase plans recognized in accordance with SFAS No. 123 would
reduce the Company's net income from $52.9 million (basic income per share of
$0.73 and diluted income per share of $0.67 per share) to $42.9 million (basic
income per share of $0.59 and diluted income per share of $0.54 per share) in
fiscal 1998, and from $32.9 million (basic income per share of $0.48 and diluted
income per share of $0.43) to $27.6 million (basic income per share of $0.40 per
share and diluted income per share of $0.36) in fiscal 1997. Pro forma net
income reflects only options granted and shares issued in fiscal 1998 and fiscal
1997. Because the pro forma compensation cost for the stock option program is
recognized over the four-year vesting period, the foregoing pro forma reductions
in the Company's net income are not representative of anticipated amounts in
future years.
<PAGE>
 
The following table summarizes information regarding options outstanding and
options exercisable at September 30, 1998:

<TABLE>
<CAPTION>
                                            Options Outstanding                            Options Exercisable
                                                   Weighted
                                   Number           Average           Weighted            Number           Weighted
Range of                      Outstanding         Remaining            Average       Exercisable            Average
Exercise Prices             As of 9/30/98   Contractual Life    Exercise Price     As of 9/30/98     Exercise Price
<S>                         <C>             <C>                 <C>                <C>               <C>  
  $ 0.05 -  $ 3.75              4,492,243               6.56            $ 2.65         2,179,085             $ 2.24
  $ 3.87 -  $14.46              2,751,158               8.31            $10.97         1,107,846             $10.94
  $15.75 -  $18.87              2,830,800               9.22            $18.79           509,025             $18.79
  $19.12 -  $31.25                569,000               9.24            $23.24            55,150             $22.55
- ------------------------------------------------------------------------------------------------------------------------------------

  $ 0.05 -  $31.25             10,643,201               7.86            $10.19         3,851,106             $ 7.22
</TABLE>

1991 Employee Stock Purchase Plan  The Company's 1991 Employee Stock Purchase
Plan (the Purchase Plan) was adopted by the Board of Directors and approved by
the shareholders effective December 11, 1991. A total of 1,500,000 shares of
common stock has been reserved for issuance under the Purchase Plan. Under the
Purchase Plan, eligible employees may purchase shares of the Company's common
stock at six-month intervals at 85% of the lower of the fair market value on the
first or the last day of each six-month period. Employees may purchase shares
having a value not exceeding 20% of their compensation, including commissions
and overtime, but excluding bonuses. Employees may end their participation in
the offering at any time during the offering period, and participation ends
automatically on termination of employment with the Company. In fiscal 1998 and
1997, 117,363 and 142,416 shares, respectively, were issued under the Purchase
Plan at average prices of $19.09 and $11.21. At September 30, 1998, 771,077
shares were reserved for future issuance.


Note 8 - Income Taxes

Income tax expense consists of the following:

<TABLE>
<CAPTION>
                                                       September 30,
                                                  1998       1997    1996
- --------------------------------------------------------------------------------
                                                      (in thousands)
<S>                                              <C>      <C>       <C>
Current:
 Federal                                         $ 9,775  $      -  $  300
 State                                             6,563       101     755
 Foreign                                               -         -     350
                                                 $16,338  $    101  $1,405
- --------------------------------------------------------------------------------
Deferred:
 Federal                                         $  (946) $  3,018  $    -
 State                                            (2,314)      533       -
                                                 $(3,260) $  3,551  $    -
- --------------------------------------------------------------------------------
Total:
 Federal                                         $ 8,829  $  3,018  $  300 
 State                                             4,249       634     755
 Foreign                                               -         -     350
                                                 $13,078   $ 3,652  $1,405 
- --------------------------------------------------------------------------------
</TABLE>
 
<PAGE>
 
The actual income tax expense differs from the expected tax expense computed by
applying the federal corporate tax rate of 35% for the years ended September 30,
1998, 1997 and 1996, to income before income taxes as follows:

<TABLE>
<CAPTION>
                                                                             September 30,
                                                                    1998          1997         1996
- -----------------------------------------------------------------------------------------------------
                                                                            (in thousands)
<S>                                                               <C>        <C>             <C>
Federal income taxes at statutory rate                            $ 23,083        $ 12,790   $ 4,918
State income taxes, net of federal benefit                           4,139           2,146       755
Alternative minimum taxes                                               --              --       300
Foreign income taxes                                                    --              --       350
Research & development credits                                        (595)           (700)       --
Adjustment for deferred tax assets for
 enacted changes in tax laws and rates                                  --            (479)       --
Reduction in valuation allowance (net of valuation
 allowance of $2,923 in 1998 credited to Shareholders equity)      (14,124)        (10,105)   (4,918)
Other                                                                  575              --        --
- -----------------------------------------------------------------------------------------------------
                                                                  $ 13,078        $  3,652   $ 1,405
- -----------------------------------------------------------------------------------------------------
</TABLE>

The tax effects of temporary differences that give rise to a significant portion
of the deferred tax assets are summarized as follows (in thousands):

<TABLE>
<CAPTION>
                                                  September 30,
                                                 1998      1997
- ------------------------------------------------------------------
<S>                                             <C>      <C>
Deferred tax assets:
 Net operating loss carryforwards               $ 8,423  $ 22,114
 Research & development tax credits               4,582     3,995
 Allowances and reserves                          4,256     2,981
 Accumulated depreciation & amortization            510     1,620
 Federal AMT and foreign tax credits                851        18
 California manufacturers investment credit       1,144       491
 State taxes                                        812        --
 Other                                              404       628
- ------------------------------------------------------------------
   Total gross deferred tax assets               20,982    31,847
 Less valuation allowance                            --   (17,047)
- ------------------------------------------------------------------
   Net deferred tax assets                      $20,982  $ 14,800
- ------------------------------------------------------------------
</TABLE>

In assessing the realizability of deferred tax assets, management considered
whether it is more likely than not that some portions or all of the deferred tax
assets will not be realized. The ultimate realization of deferred tax assets is
dependent on the generation of future taxable income during the periods in which
those temporary differences become deductible. Management considers the
projected future taxable income and tax-planning strategies in making this
assessment. Based on the level of historical taxable income and projections for
future taxable income over the periods in which the deferred tax assets are
deductible, the Company has eliminated the valuation allowance for all
deductible differences. Management believes that it is more likely than not that
the results of future operations will generate sufficient taxable income to
realize the net deferred tax assets.

During fiscal 1998, the Company recognized tax benefits associated with employee
stock options aggregating $11,273,000. Such benefits have been recorded directly
to shareholders equity.
<PAGE>
 
The change in the valuation allowance for the year ended September 30, 1998 was
$17,047,000, of which $14,124,000 reduced income tax expense for the year. The
remaining $2,923,000 was credited to additional paid-in capital which was the
amount attributable to net operating losses created by the exercise of stock
options previously unrecognized.

As of September 30, 1998, the Company had net operating loss carryforwards for
federal and state income tax purposes of $22,546,000 and $10,009,000,
respectively, which are available to offset future taxable income through 2012
and 2003, respectively. Additionally, the Company had research and development
tax credit carryforwards for federal and state income tax purposes of $3,623,000
and $1,477,000, respectively, which are available to offset future income taxes,
if any, through 2013.

Note 9 - Significant Customers, Concentration of Credit Risk and Segment
Information

In fiscal 1998, two customers accounted for 23% and 15% of total revenues. In
fiscal 1997, three customers accounted for 22%, 20% and 12% of total revenues.
In fiscal 1996, two customers accounted for 25% and 11% of total revenues.

The Company generally sells its products to customers engaged in the design
and/or manufacture of high technology products either recently introduced or not
yet introduced to the marketplace. Substantially all the Company's trade
accounts receivable are due from such sources. The Company's major customers who
account for more than 10% of total revenues aggregated 41% and 44% of total
trade receivables at September 30, 1998 and 1997, respectively.

Export revenues are summarized by geographic areas as follows (in thousands):


                                      1998     1997     1996
- --------------------------------------------------------------
Europe                               $18,197  $ 6,452  $ 6,505
Japan                                 13,603   24,102    7,972
Other                                 12,052    4,849    1,147

                                     $43,852  $35,403  $15,624
- --------------------------------------------------------------

Note 10 - Retirement Savings Plan

The Company has a qualified retirement plan under the provisions of Section
401(k) of the Internal Revenue Code covering substantially all employees.
Participants in this plan may defer up to the maximum annual amount allowable
under IRS regulations. The contributions are fully vested and nonforfeitable at
all times. The Company does not make matching contributions under the plan.
<PAGE>
 
Note 11 - Commitments and Contingencies

The Company leases facilities under noncancelable operating leases that expire
through 2003. The Company also leases certain machinery and equipment under
noncancelable operating leases that expire through 2003.

Approximate minimum rental commitments under these operating leases as of
September 30, 1998, were as follows (in thousands):


Year ending September 30:
- ------------------------------------------------------------------------------
           1999              $1,221
           2000               1,183
           2001               1,024
           2002                 897
           2003                 787

                             $5,112
- ------------------------------------------------------------------------------

Rent expense under operating leases was approximately $1,844,000, $1,980,000 and
$2,507,000 for the years ended September 30, 1998, 1997 and 1996, respectively.

In October 1996, the Company entered into a five-year operating lease agreement
with a bank providing for $27.5 million of financing for the acquisition and
construction of a wafer fabrication facility in Colorado Springs, Colorado.
Payments under this lease commenced in fiscal 1998 and are based on LIBOR rates
plus a spread of 1.75%. The Company has the option to renew the lease for an
additional three-year term. The Company has the option of purchasing the
property at the end of the initial lease term, and at the end of each renewal
period for the lessor's original cost, which is not less than the fair market
value at each option date. If at the end of the lease term the Company does not
purchase the property, the Company would guarantee a residual value to the
lessor equal to 84% of the lessor's cost of the facility, equal to $23,100,000.
As of September 30, 1998, the lessor had advanced a total of $26,987,000 under
this lease and had held $22,669,000 as cash collateral, which amount is included
in restricted long-term deposits.

In August 1997, the Company entered into a three-year operating lease
arrangement with the same bank providing for $45 million of financing for the
acquisition of capital equipment for the Colorado Springs wafer fabrication
facility. The Company has the option to renew the lease for up to two one-year
extensions. Payments under this lease commenced in fiscal 1998 and are based on
LIBOR rates plus a spread of 1.50%. The Company has the option of purchasing the
property at the end of the initial lease term, and at the end of each renewal
period for the lessor's original cost, which is not less than the fair market
value at each option date. If at the end of the lease term the Company does not
purchase the equipment, the Company would guarantee a residual value to the
lessor equal to 86% of the lessor's cost of the equipment, equal to $38,700,000.
As of September 30, 1998, the lessor had advanced a total of $45,000,000 under
this lease and had held $36,000,000 as cash collateral, which amount is included
in restricted long-term deposits.
<PAGE>
 
In July 1998, the Company entered into a four-year operating lease arrangement
with a bank providing for $10 million of financing for the acquisition of
certain test equipment. The Company has the option to renew the lease for one
year. Payments under this lease began in fiscal 1998 and are based on the 30-Day
Commercial Paper rate plus a spread of 1.5%. The Company has the option of
purchasing the property at the end of the initial lease term, and at the end of
each renewal period for the lessor's original cost, which is not less than the
fair market value at each option date. If at the end of the lease term the
Company does not purchase the equipment, the Company would guarantee a residual
value to the lessor equal to 86% of the lessor's cost of the equipment, equal to
$8,600,000. As of September 30, 1998, the lessor had advanced a total of
$3,258,000 under this lease and had held $2,607,000 as cash collateral, which
amount is included in restricted long-term deposits.

The $27.5 million and the $45 million operating leases require the Company to
meet certain financial and other covenants, including a restriction on the
payment of cash dividends to its shareholders. As of September 30, 1998, the
Company was in compliance with all covenants.

The Company is a party to various investigations, lawsuits and claims arising in
the normal course of business. In the opinion of management, the ultimate
disposition of these matters will not have a material adverse effect on the
Company's consolidated financial position, results of operations or liquidity.

Note 12 - Subsequent Event (unaudited)

In November 1998, the Company entered into an agreement to acquire all of the
outstanding capital stock of Vermont Scientific Technologies, Inc. for $16
million in cash. The transaction will be accounted for as a purchase.
<PAGE>
 
Officers

Louis R. Tomasetta
President and Chief Executive Officer, Director

Ian Burrows
Vice President, Fab 1 - Camarillo

Robert Cutter
Vice President Manufacturing and General Manager,
Colorado Springs

Ira Deyhimy
Vice President, Product Development

Christopher R. Gardner
Vice President and General Manager, ATE Division

Eugene F. Hovanec
Vice President, Finance and Chief Financial Officer

Jeanne Johnson
Vice President, Human Resources

James Mikkelson
Vice President and Chief Technology Officer

Michael S. Millhollan
Vice President and General Manager,
Data Communications Division

Robert R. Nunn
Vice President and General Manager,
Telecommunications Division

Neil J. Rappaport
Vice President, Sales

Ram Venkataraman
Vice President, Quality


Directors
James A. Cole
General Partner of Windward Ventures

Alex Daly
President and Chief Executive Officer,
Cygnus Solutions, Inc.

Pierre R. Lamond
Chairman of the Board,
Vitesse Semiconductor Corporation
General Partner of Sequoia Capital

John C. Lewis
Chairman of the Board,
Amdahl Corporation

Louis R. Tomasetta
President and Chief Executive Officer,
Vitesse Semiconductor Corporation
<PAGE>
 
Corporate Information
Stock Listing: Common stock traded on Nasdaq National Market System

Symbol: VTSS

Options: The Company's options are traded on the Chicago Board Option Exchange

General Counsel
Wilson, Sonsini, Goodrich & Rosati
650 Page Mill Road
Palo Alto, CA 94304-1050

Independent Auditors
KPMG Peat Marwick LLP
21700 Oxnard Street, Suite 1200
Woodland Hills, CA 91367

Transfer Agent and Registrar

BankBoston, N.A.
c/o Boston EquiServe, LP
Mail Stop 45-02-62
P.O. Box 1865
Boston, MA 02105-1865

Form 10-K
The Company, upon written request, will provide without charge to each
shareholder a copy of its annual report on Securities and Exchange Commission
Form 10-K for the year ended September 30, 1998. Requests should be directed to:

 Vitesse Semiconductor Corporation
 Investor Relations
 741 Calle Plano
 Camarillo, CA 93012

Annual Meeting
The Vitesse Semiconductor Corporation annual meeting will be held on Tuesday,
January 26, 1999 at 10:30 a.m. at the Hyatt Westlake Plaza, 880 S. Westlake
Boulevard, Westlake Village, California.

<PAGE>
 
                       Consent of Independent Accountants
                       ----------------------------------
                                        

The Board of Directors
Vitesse Semiconductor Corporation

We consent to incorporation by reference in the registration statement (No.
333- 53463) on Form S-8 of our report dated October 14, 1998, relating to the
consolidated balance sheets of Vitesse Semiconductor Corporation and
subsidiaries as of September 30, 1998 and 1997, and the related consolidated
statements of operations, shareholders' equity and cash flows for each of the
years in the three year period ended September 30, 1998, and related schedule,
which report appears in the September 30, 1998 annual report on Form 10-K of
Vitesse Semiconductor Corporation.


                                                (signed) KPMG PEAT MARWICK LLP


Los Angeles, California
December 21, 1998

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM 1998 ANNUAL
REPORT AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   YEAR                   YEAR
<FISCAL-YEAR-END>                          SEP-30-1998             SEP-30-1997
<PERIOD-START>                             OCT-01-1997             OCT-01-1996
<PERIOD-END>                               SEP-30-1998             SEP-30-1997
<CASH>                                          70,684                  97,358
<SECURITIES>                                    91,610                  58,486
<RECEIVABLES>                                   40,953                  22,072
<ALLOWANCES>                                     1,000                   1,000
<INVENTORY>                                     16,795                  11,809
<CURRENT-ASSETS>                               243,032                 204,646
<PP&E>                                          95,078                  69,629
<DEPRECIATION>                                  38,623                  27,945
<TOTAL-ASSETS>                                 368,411                 292,280
<CURRENT-LIABILITIES>                           27,723                  27,178
<BONDS>                                              0                     147
                                0                       0
                                          0                       0
<COMMON>                                       300,241                 277,528
<OTHER-SE>                                      40,447                (12,426)
<TOTAL-LIABILITY-AND-EQUITY>                   368,411                 292,280
<SALES>                                        175,082                 104,850
<TOTAL-REVENUES>                               175,082                 104,850
<CGS>                                           69,352                  45,500
<TOTAL-COSTS>                                  118,326                  76,188
<OTHER-EXPENSES>                                     0                    (84)
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                   0                     157
<INCOME-PRETAX>                                 65,951                  36,540
<INCOME-TAX>                                    13,078                   3,652
<INCOME-CONTINUING>                             52,873                  32,888
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    52,873                  32,888
<EPS-PRIMARY>                                     0.73                    0.48
<EPS-DILUTED>                                     0.67                    0.43
        

</TABLE>


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