ADTRAN INC
10-K, 1999-03-31
TELEPHONE & TELEGRAPH APPARATUS
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                    SECURITIES AND EXCHANGE COMMISSION
                         Washington, D. C. 20549

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

            [X] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
                  OF THE SECURITIES EXCHANGE ACT OF 1934
               For the Fiscal Year Ended December 31, 1998

          [ ] 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 0-24612

                               ADTRAN, Inc.
          (Exact name of Registrant as specified in its charter)

Delaware                                                         63-0918200
(State of incorporation)                                        (I.R.S. Employer
                                                          Identification Number)


          901 Explorer Boulevard, Huntsville, Alabama 35806-2807
       (Address of principal executive offices, including zip code)

                              (256) 963-8000
           (Registrant's telephone number, including area code)


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

Securities registered pursuant to Section 12(g) of the Act: Common Stock,
$.01 par value

     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  the  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  Registrant's  outstanding  Common Stock
held by  non-affiliates  of the  Registrant  on March 1, 1999 was  $568,848,869.
There were 39,402,679 shares of Common Stock outstanding as of March 1, 1999.

                    DOCUMENTS INCORPORATED BY REFERENCE

     Portions of the Proxy  Statement for the Annual Meeting of  Stockholders to
be held on April 20, 1999 are incorporated herein by reference in Part III.
<PAGE>

                               ADTRAN, Inc.
                        Annual Report on Form 10-K
               For the Fiscal Year Ended December 31, 1998

                            Table of Contents

Item                                                                      Page
Number                                                                   Number

                                  PART I

 1.   Business                                                              3

 2.   Properties                                                           13

 3.   Legal Proceedings                                                    13

 4.   Submission of Matters to a Vote of Security Holders                  14

                                 PART II

 5.    Market  for  the  Registrant's  Common  Equity  and  Related
       Stockholder Matters                                                 16

 6.   Selected Financial Data                                              17

 7.   Management's Discussion and Analysis of Financial Condition and
      Results of Operations                                                18

 7a.  Quantitative and Qualitative Disclosures About Market Risk           23

 8.   Financial Statements and Supplementary Data                          23

 9.   Changes in and Disagreements with Accountants on Accounting and
      Financial Disclosure                                                 37

                                 PART III

 10.  Directors and Executive Officers of the Registrant                   37

 11.  Executive Compensation                                               38

 12.  Security Ownership of Certain Beneficial Owners and Managemen        38

 13.  Certain Relationships and Related Transactions                       38

                                 PART IV

  14.  Exhibits, Financial Statement, Financial Statement  Schedules,
       and Reports on Form 8-K                                             38

                                SIGNATURES                                 41

                            INDEX OF EXHIBITS                              44
<PAGE>

                               PART I

ITEM 1.   BUSINESS


OVERVIEW

     ADTRAN, Inc. (the "Company") designs, develops,  manufactures,  markets and
services a broad range of high-speed digital  transmission  products utilized by
telephone  companies  ("Telcos") and corporate  end-users to implement  advanced
digital data services over existing  telephone  networks.  Most of the Company's
Telco and customer  premises  equipment  ("CPE")  products are  connected to the
local loop ("Local Loop").  The Local Loop is the large existing  infrastructure
of the telephone network  connecting  end-users to a Telco's central office, the
facility that provides the local switching and distribution  functions ("Central
Office").  The balance of the Company's products are used in the Telcos' Central
Offices.

     The  Company's  product  lines,  which are  comprised of over 500 principal
products, are built around core technologies developed by the Company to address
the Local Loop and Central  Office  digital  communications  marketplace.  These
products include a comprehensive line of transmission,  repeater,  extension and
termination  products.  The  Company  also  offers a broad line of  multiplexers
providing  modular  flexibility  to the CPE  marketplace.  Separate  T-1 and T-3
product  lines are sold to Telcos  for use within  their  Central  Offices.  The
Company has  addressed  the  wireless  marketplace  with the  introduction  of a
wireless spread spectrum microwave transceiver.

     The Company's products address two market segments:  (i) Telco products for
use in the Local Loop or in a Central Office,and (ii)CPE products for end-users.
In 1998,  sales  of  Telco  and CPE  products  accounted  for  58.5%  and  41.5%
respectively, of the Company's sales. The Company's Telco products deliver cost-
effective  digital services such as 56/64 Kbit/sec Digital Data Service ("DDS"),
128 Kbit/sec Integrated Services Digital Network ("ISDN"),  64 Kbit/sec to 1.544
Mbit/sec Frame Relay service ("Frame Relay") and 1.544 Mbit/sec T-1 (24 Channel)
service.  In addition,  the Company's  High  bit-rate  Digital  Subscriber  Line
("HDSL")  products permit T-1 transmission on up to 12,000 feet of unconditioned
copper  wireline  while  reducing the need for costly  mid-span  repeaters.  The
Company's CPE products  provide  end-users  access to Telco digital services and
often  include  additional  features for  specific  end-user  applications.  The
Company has  introduced  and shipped a number of HDSL,  ISDN and other  products
which  comply with  international  standards  to  increase  its  penetration  of
overseas markets. See "Business -Products."

     The rapidly  expanding  requirements for digital  transmission in the Local
Loop are being driven by Internet  access,  small  office/home  office  ("SOHO")
users, video delivery and on-line data services,  among other applications,  all
of which require and benefit from the speed, reliability and low cost of digital
transmission.  While the Telcos have, to a large extent, replaced their wireline
data  transmission  network between Central Offices with fiber-optic and digital
microwave links which allow for high speed digital transmission,  the Local Loop
remains predominantly characterized by low speed analog transmission over copper
wirelines.  As a  result,  there has been  considerable  impetus  for  Telcos to
upgrade the Local Loop in the most cost effective manner  available.  Widespread
replacement of the copper wireline Local Loop remains  prohibitively  expensive,
so the Telcos have turned to manufacturers  such as the Company for technologies
that expand  Local Loop  capabilities  to handle  digital  transmission  without
necessitating this costly replacement.  Existing digital delivery  technologies,
including  Frame  Relay,  ISDN and HDSL,  are all  experiencing  rapid  compound
growth.  Numerous  higher  speed  digital  technologies  are under  development,
including  many  versions  of  Digital   Subscriber  Line  ("DSL")   technology,
Asynchronous Transfer Mode ("ATM"),  wireless  transmission,  hybrid fiber coax,
cable modems and other technologies.

     The   Company's   core   technologies   expand  the  digital   transmission
capabilities of the Local Loop by enabling  increased  transmission speed and/or
increased  transmission  distance.  Ongoing  research  and  product  development
activities are designed to enhance the distances covered by existing services as
well as to develop new higher speed technologies.  For example, during the first
quarter of 1996,  the Company  demonstrated  to the Telcos its new "Total Reach"
delivery technology which increases the distance covered by ISDN services in the
Local  Loop  from  18,000  feet to 30,500  feet.  The same  technology  has been
incorporated  into  64Kbit/sec  digital  products for use in Frame Relay and DDS
services.  In  addition,  the  Company  is  engaged  in  research,   performance
simulation, and design of higher speed digital technologies for the transport of
data.  Current  issues for future higher speed digital  technologies,  including
costs,  power  consumption  and  distances  reachable,   must  be  resolved  for
widespread acceptance and deployment of these technologies.

     In developing its product families,  the Company has continuously  improved
its design,  purchasing and production  processes to lower product costs and has
consistently  offered  improved  products  at lower  prices to  customers.  As a
result, management believes that the Company is a leading provider of Local Loop
and  Central  Office  digital  transmission  products  to Telcos.  See  "Company
Strategy." The Company's customers include all Regional Bell Operating Companies
("RBOCs"), GTE Corporation,  the three largest interexchange carriers, the 1,300
independent telephone companies, Competitive Local Exchange Carriers ("CLEC") as
well  as a  number  of  worldwide  electronics,  communications  and  industrial
companies. See "Business-Customers."

     The Company was  incorporated  under the laws of Delaware in November  1985
and commenced operations in January 1986.


RECENT DEVELOPMENTS

     The Company is continuing a project to expand its facilities in Huntsville,
Alabama  in  phases  over the next  two  years at a cost  expected  to  exceed
$150,000,000,  of which  almost  $56,585,000  had been  incurred at December 31,
1998. Fifty million dollars of this project was approved for participation in an
incentive program offered by the Alabama State Industrial  Development Authority
(the "Authority").  That incentive program enables participating  companies such
as the Company to generate Alabama corporate income tax credits that can be used
to reduce the amount of Alabama  corporate  income taxes that would otherwise be
payable.  There can be no assurance  that the State of Alabama will  continue to
make these corporate income tax credits available in the future, and the Company
therefore  may not realize the full benefit of these  incentives.  The Authority
has issued $50,000,000 of its taxable revenue bonds pursuant to such program and
loaned the proceeds  from the sale of the bonds to the  Company.  The Company is
required  to make  payments to the  Authority  in amounts  necessary  to pay the
principal of and interest on the Authority's  Taxable Revenue Bond,  Series 1995
(ADTRAN,  Inc.  Project),  as amended,  currently  outstanding  in the aggregate
principal amount of $50,000,000. Said bond matures on January 1, 2020, and bears
interest  at the rate of 45 basis  points  over the money  market  rate of First
Union National Bank.

COMPANY STRATEGY

The Company's growth strategy includes the following elements:

     FOCUS ON LOCAL LOOP AND CENTRAL OFFICE DIGITAL TRANSMISSION PRODUCTS.  Upon
commencing  operations in 1986,  the Company  focused its product  strategy upon
capturing a significant  market share for sales of Local Loop and Central Office
digital  transmission  products  to  Telcos.  This  focus was the  result of the
recognition by the Company's founders of the significant  opportunity created by
the  elimination  of  American  Telephone & Telegraph  Co.'s  ("AT&T")  monopoly
position in the manufacture of telecommunications  equipment.  Having achieved a
leading  market  share of Local Loop and  Central  Office  digital  transmission
products,  the Company intends to consolidate its position through an integrated
program of new product development, customer service and product excellence.

     CAPITALIZE ON EXISTING LEADERSHIP POSITION IN THE TELCO MARKET. As a leader
in the Telco  market  it  serves,  the  Company  intends  to apply its sales and
customer service  resources to new market  opportunities  that arise as expanded
services are provided by the Telcos in response to increasing subscriber demand.
In this  regard,  the Company  expects that its  in-depth  understanding  of and
experience  with Local Loop and  Central  Office  technology  will  provide it a
competitive advantage.  The Company is committed to replace most of its products
with  succeeding  generations of products with lower costs,  additional  product
features and improved serviceability.

     ADAPT PRODUCT TECHNOLOGY AND SALES FORCE TO CPE MARKET. Over the past eight
years,  the Company has adapted product  technology  developed for Telco Central
Offices for use in the Company's CPE product lines. As many of the  technologies
that are critical to success in the CPE market are  identical  to those  already
developed and refined for the Company's Telco products, the Company has realized
a competitive advantage through leveraging these product development efforts and
expertise in all of its markets. To sell its CPE products to the large number of
end-users  which  comprise the market,  the Company has built a dedicated  sales
force and an  extensive  nationwide  network of  re-sellers  over the past eight
years.  The  Company  intends to  continue  the  expansion  of its  distribution
channels to address the worldwide market for its CPE products.

     EXPAND  INTO  INTERNATIONAL  MARKETS.  While  international  sales  are not
currently  substantial,  international  customers  have begun to order,  and the
Company  has  shipped,  international  versions of the  Company's  Telco and CPE
products.  The Company has formed,  and will  continue to pursue,  international
distribution  arrangements built upon core products and technology  developed by
the Company in an effort to further its penetration into international  markets.
The Company has also  focused on  developing  E-1  technology,  the  predominant
standard for data  transmission  outside of North  America.  In the future,  the
Company plans to add appropriate support capabilities and introduce new versions
of its products that  incorporate E-1 technology and that otherwise  comply with
relevant international standards. The Company's development process currently is
conducted in accordance  with ISO 9001, the  international  standard for quality
management systems for design, manufacturing and service.

     INVEST IN  ENGINEERING  AND PRODUCT  DEVELOPMENT.  The  Company  expects to
continue its relatively  high levels of investment in developing  innovative new
products,  and redesigning  existing products,  in order to reduce product costs
and  production  cycle times,  and in so doing will continue its efforts to be a
low cost  provider in the  industry.  New  products  are  generally  targeted at
opportunities that promise rapid growth as product costs are reduced and feature
sets are  optimized.  The Company  will also  continue to develop and expand its
broad  product  line  serving  each of the Telco and CPE  markets.  The  Company
continuously monitors developing technologies and introduces products as defined
standards and markets emerge. This  diversification in products and markets will
continue to be a key to the Company's business strategy.

     ADAPT TO NEW LOCAL LOOP MEDIA.  New Local Loop  connections  continue to be
implemented primarily with copper wirelines, although the Company anticipates an
increased  use  of  fiber-optic,  coaxial  and  wireless  communications  in new
installations  over the next  decade and more.  To the extent  such  alternative
connection methods become economically advantageous, and as such markets develop
and grow,  the Company  will  continue  to extend its  technical  and  marketing
experience to develop products meeting the demands of such markets.

     COMMIT TO  CONSTANT  IMPROVEMENTS  IN  QUALITY  AND  SERVICE.  The  Company
believes its success to date has been due in large measure to its  commitment to
constantly  improve  product quality and customer  service.  This commitment has
been  formally  recognized  in  awards  received  from  several  of its  largest
customers.   In  the  future,   product   quality  is  expected  to   contribute
significantly  to the  Company's  efforts to reduce  production  cycle times and
product costs.

PRODUCTS

     CORE PRODUCT TECHNOLOGY. The Company's product lines, comprised of over 500
principal products,  are built around core technologies developed by the Company
to  address  the   Central   Office  and  Local  Loop   digital   communications
marketplaces.  Central  Office  facilities,  approximately  30,000  of which are
located throughout North America,  provide subscribers with access to a discrete
portion of the network's bandwidth on a switched basis ("switched access") or on
an exclusive  basis  ("private  line").  Typically,  access is available in unit
multiples of 56 Kbit/sec (64 Kbit/sec in some  locations)  increments,  although
Telco  multiplexing  equipment can efficiently  aggregate these basic increments
into high speed channels up to T-1 rates (1.544 Mbit/sec),  T-3 (45 Mbit/sec) or
faster rates. Individual channels can also be
subdivided to speeds as low as 2.4 Kbit/sec.

     Each  individual  Local  Loop  circuit  is  served  by a  circuit  assembly
(consisting of a channel unit, U-Basic Rate Transmission  Extender, or "U-BR1TE"
or other similar products manufactured by the Company) that plugs into a Central
Office  channel  bank or shelf.  The speed and  functionality  of the circuit is
determined by the type of circuit assembly  deployed by the Telco. For each such
circuit,  Central Office  facilities  generally  make available a  corresponding
physical  mounting  position in a channel  bank or shelf,  and  plug-in  circuit
assemblies  are  installed  in  accordance  with  the  service  ordered  by  the
subscriber. Other special plug-in circuit assemblies, such as those manufactured
by the Company,  are commonly  employed to connect or bridge circuits within the
Central Office.  Individual  communication channels (multiplexer time slots) are
interconnected  and switched as appropriate  within the Central Office,  and the
resultant communications payload is then directed toward the proper destination.
If the  communications  traffic needs to be delivered to another Central Office,
it is directed toward the inter-office network,  usually through a long distance
carrier such as AT&T, MCI or Sprint. At the far-end  connection,  the process is
reversed.  Voice is converted into digital form by circuit assemblies within the
RBOC's  Central  Office and treated  like any other  digital  information  until
delivered to the far-end  serving  Central Office where it is returned to analog
form in the Local Loop. However, when products such as those sold by the Company
are utilized, data communications traffic remains in digital form end to end.

     In recent years, the need for higher volume data  communications has led to
the development of "remote huts." Like the Central  Office,  remote huts provide
subscriber access through plug-in circuit  assemblies such as those manufactured
by the Company,  but they can take advantage of high capacity  fiber-optic links
or multiple copper links to bring service to the local area economically. Remote
huts are then  connected by the Local Loop to end-users  with  products  such as
those sold by the  Company.  The Company  also  manufactures  optional  mid-span
repeaters or loop  extension  devices that extend the service range of the Local
Loop, as well as termination  units that may be deployed to monitor and maintain
service to the subscriber.

     At the customer's premises,  terminating equipment receives the transmitted
signal  from the  Central  Office and  converts  it to a form useful to end-user
products such as LAN interconnection gear, video conferencing  equipment,  PBXs,
personal computers and related equipment. In general, the Local Loop and related
CPE products support bi-directional communications traffic.

     Today, the Company's  product lines consist of two groups of inter- related
products,  all evolving  from the core product  technologies  developed  for the
Local Loop:

     *    Telco Central Office and Local Loop digital transmission
products.

     *    CPE products.

     TELCO CENTRAL OFFICE AND LOCAL LOOP DIGITAL TRANSMISSION PRODUCTS.  Several
hundred to several thousand circuit  assemblies,  such as those  manufactured by
the  Company,  are required at each  Central  Office,  since each Local Loop may
require a unit of this type to provide service to each subscriber.  In 1998, the
Company delivered more than 894,927 units of this product group,  accounting for
74.9% of the Company's total units shipped.  Telco products  accounted for 58.5%
and 64.8% of the Company's sales in 1998 and 1997, respectively.  Sales of Telco
products to original  equipment  manufacturers  ("OEMs")  are  included in these
percentages.  The Company had in prior years reported Telco product sales to OEM
customers in an OEM product section of Form 10-K, and were not part of the Telco
product  percentages.  The  Company now  categorizes  certain OEM sales as Telco
product sales, as the OEM supply contracts are customer funded  modifications of
Telco products.

     Typical of the  different  versions of Central  Office  channel  assemblies
manufactured by the Company are the various OCU dataports and related  products,
the  fundamental  building blocks for delivering DDS and Frame Relay services at
56/64  Kbit/sec  rates to  subscribers.  In response  to the Telco's  need for a
method  to  monitor  transmission  conditions  and to detect  problems  for each
individual  circuit,  the Company  pioneered  development  of the  Digital  Data
Station  Termination  ("DDST") product family.  Both the OCU dataports and DDSTs
are produced in relatively high volumes directly related to the increased demand
for DDS and Frame Relay services.

     The Total Reach family of products  uses one of ADTRAN's own  technological
breakthroughs,  Simple-Coded  Pulse  Amplitude  Modulation (SC PAM),  to extend
digital  services  over one  twisted  pair of  copper  wires.  Total  Reach  DDS
addresses some of the major  challenges  associated with traditional DDS service
deployment  such as multiple  copper pair  availability  in the customer's  CSA;
extensive  engineering  for repeaters and apparatus  cases  required for lengthy
installs;   bridged  tap  determination   and  removal  efforts;   and  powering
requirements for customer-located termination devices.
    
     The  Company is the  industry's  primary  supplier of  U-BR1TEs,  which are
required to extend ISDN  service  from an ISDN  capable  switch at a hub Central
Office to a serving Central Office or to remote Channel Banks.  The Company also
supplies a substantial portion of the industry's ISDN mid-span repeaters.  Other
ISDN products include a BR1TE Bank to mount multiple  U-BR1TES,  T-BR1TES,  NT-1
interface units, Total Reach, and outside plant housings for the repeaters.

     Late in 1993, the Company commenced  deliveries of its HDSL product family.
The  Company has chosen to develop  its own custom  integrated  circuits so HDSL
product performance,  availability and cost can be carefully managed. Management
believes  that demand for this  product  family will  increase  steadily as more
affordable  versions  increasingly  become available to the Telcos. 

     Already the industry leader in HDSL,  ADTRAN released its new line of HDSL2
products in the first  quarter of 1999.  The products are designed  according to
the proposed standard  developed by the ANSI T1E1.4 Standards  Committee,  whose
HDSL2  line  coding  technique  originated  with  ADTRAN's   Simple-Coded  Pulse
Amplitude  Modulation (SC PAM)  technology.  The ADTRAN HDSL2  products  feature
two-wire  T1  transport  up to 9,000  feet on  26-gauge  wire or 12,000  feet on
24-gauge  wire.  They are  also  NEBS  compliant  with  Class A2 span  powering.
ADTRAN's HDSL2 product line works within industry-standard mechanics, making the
products fully compatible with legacy network equipment.

     ADTRAN's  carrier class,  broadband  integrated  access  device,  the Total
Access 3000, offers  comprehensive  management,  enhances  reliability,  reduces
installation and life-cycle  costs, and provides for seamless upgrades to future
products and technologies. The Total Access intelligent access system integrates
ADTRAN's  industry-leading loop technologies into an intelligent  platform.  The
Total Access 3000 supports HDSL,  T1/FT1,  ISDN,  xDSL and optical DS2. A single
chassis can  simultaneously  support DS3 and DSX-1,  or SONET and DSX-1  network
interfaces. One chassis provides the necessary connections to interface with 140
two-wire loops to customer  equipment.  The Total Access 3000 platform  provides
built-in  1:1 HiCap  protection  for HDSL,  T1 and optical DS2. The Total Access
3000 system delivers  high-speed digital services at high densities in a compact
6-inch tall by 12-inch  deep  chassis.  The Total  Access  3000  system  takes a
modular approach with flexible network  multiplexer  modules  including the DS-3
mux and the STS-1 mux; with intuitive  management modules,  including a Standard
System  Controller  Unit (SCU) and a Gateway  SCU for  TL1/NMA,  SNMP and Telnet
support; and with versatile loop access modules serving optical and copper local
loops.

     Today's  sophisticated  networks require an increasing degree of monitoring
and  management  to  ensure  the  reliability  of  the  network  to  its  users.
Industry-standard  Transaction  Language 1 (TL1) and Simple  Network  Management
Protocol  (SNMP) allow common  platform  management  of a variety of  networking
products.  In  response,  ADTRAN  offers  a broad  line of  manageable  products
designed  to  satisfy  a wide  range of  management  requirements.  Many  ADTRAN
products are available  with  integral or optional  SNMP and TL1/NMA  management
ports.  In addition,  several of the ADTRAN  products  can be managed  through a
simple terminal interface. ADTRAN management solutions include the company's own
ADVISION,  an SNMP  application  graphical  user interface that will control all
ADTRAN  SNMP-managed  products.  ADVISION  allows  HP Open  View to  autodetect,
automap and automatically define trap tables for ADTRAN SNMP products.

     CPE  PRODUCTS.  The  Company's  CPE products  have evolved from  technology
developed  for its Telco product  line.  As many of the  technologies  which are
critical to success in the CPE market are identical to those  already  developed
and refined  for the  Company's  Telco  products,  the  Company  has  realized a
competitive  advantage through leveraging these product  development efforts and
expertise in all of its markets.  Since initial product  deliveries in 1991, CPE
product sales have accounted for 41.5% and 35.2% of the Company's  sales in 1998
and  1997,   respectively.   Sales  of  CPE   products  to  original   equipment
manufacturers  ("OEMs")  are included in these  percentages.  The Company had in
prior  years  reported  CPE  product  sales to OEM  customers  in an OEM product
section  of Form 10-K,  and were not part of the CPE  product  percentages.  The
Company  now  categorizes  certain OEM sales as CPE  product  sales,  as the OEM
supply contracts are customer funded modifications of CPE products.

     In most  cases,  a CPE  product is  purchased  and  installed  by end- user
customers in conjunction with a Telco's digital data transmission  service.  For
example,  a DSU is normally  installed  with each DDS loop.  The  Company's  DSU
product line was  completely  upgraded and revamped in 1993 with five new models
that can terminate any standard DDS or Switched 56 digital service  available in
North  America.  In 1994,  the product line was  expanded to include  lower cost
versions as well as a family of shelf mount units. In 1995,  products supporting
synchronous  data  compression  and  versions   supporting  the  simple  network
management  protocol were added to the family.  In 1996,  the flagship  products
were once again  redesigned  to become more modular and flexible.  In 1997,  the
Company  introduced  its "IQ  Series" of  DSU's/CSU's  with  control and monitor
features  for frame relay  circuits.  These design  changes  have  substantially
reduced the associated  manufacturing  costs while increasing the utility of the
product to the  marketplace.  Customer  acceptance  of this  product  family has
significantly  increased the Company's DSU market share, and management believes
that further gains are possible with the Company's  recent  enhancements of this
product line. In 1998, Adtran entered the T3 market with the introduction of the
T3SU 300 and focused on developing a family of integrated access devices.

     Over the past three years,  Frame Relay  Services have met with  increasing
customer acceptance. As a result, the Company has introduced an expanding family
of Frame Relay  products.  These  products are built from the core  technologies
utilized in the  existing  DSU and TSU product  families and are used to connect
end-users to frame relay networks.  Other products within this family,  known as
Frame  Relay IQ units,  are used to monitor  the  service  level of frame  relay
circuits   thereby   ensuring  the   connections   is  operating   properly  and
appropriately sized for the application.
  
     The Company  believes that its ISDN Service Unit (ISU) with  sustained data
transmission  rates up to 128  Kbit/sec  was the first  product of its type when
introduced in 1993.  New versions of the product  introduced by the Company have
followed,  including a model that  automatically  senses and adapts to virtually
any far- end communications device,  including modems, 2 wire or 4 wire DSUs, or
another ISDN  terminal  adapter.  The ISU product  family was later  extended to
include the ISU 512, a device that allows multiple ISDN lines to be combined for
use by high speed video conferencing equipment.  Additionally, ADTRAN has solved
one of the biggest  obstacles in  successful  installation  of new ISDN circuits
with the  introduction of its "Expert ISDN"  technology.  Expert ISDN allows CPE
devices to automatically determine key parameters, such as Telco switch type and
Service Profile Identifiers ("SPIDS").  Previously, these parameters were passed
manually from the Telco to the user, who manually  entered the information  into
the CPE  device.  ADTRAN's  latest ISDN  terminal  adapter,  the  Express  3000,
utilizes this technology.  Adtran's ISDN terminal  adapters have been recognized
by Computer  Telephony  Magazine as  "Products of the Year" and received the "97
Design and Engineering" award at the Winter Consumer Electronics Show (CES).

     Late in 1993,  initial  installations  of the  Company's  T-1 Service  Unit
("TSU") were successfully completed. Offering full or fractional T-1 access, the
product  line  is  designed  for   sophisticated   users  needing  higher  speed
interconnection  of  LANs,  remote  offices,  video  delivery  systems,  graphic
workstations  and related  equipment.  Common plug-in  modules are available for
several of the Company's  models,  tailoring  the units for multi-  channel data
communications.   TSU  order  rates  have  increased  steadily  since  the  1993
introduction and now comprise a significant  portion of CPE sales. The Company's
technical  expertise was  recognized in July of 1997 as ADTRAN's TSU 120 TSU/CSU
received a Users Choice  Award from  Communications  News  Magazine in the T1/T3
networking category.

     Late in 1997, the Company  introduced  its new Atlas 800 Integrated  Access
System.  ATLAS is a modular,  highly  scaleable  platform that  provides  robust
solutions  addressing  the wide  area  communication  needs of  medium  to large
corporations as well as network access providers.  ATLAS is a powerful host-site
access  platform  that provides  customers  with a total  integrated  end-to-end
solution.  ATLAS  is  useful  in  networks  utilizing  traditional  leased  line
services,   switched  network  services,  and  frame  relay  services,   thereby
complementing the many remote site products offered by the Company.

     

INTERNATIONAL MARKETS

     The Company  serves its  international  markets  through a  combination  of
direct  sales and  distribution  agreements.  The Company  has formed,  and will
continue  to pursue,  international  distribution  arrangements  built upon core
products and  technologies  developed by the Company in an effort to further its
penetration into international  markets. In addition, the Company has focused on
developing  E-1  technology  which,  though  similar  to T-1  technology,  has a
transmission  rate of 2.048  Mbit/sec and is the  predominant  standard for data
transmission outside of North America.  The Company has tested,  received orders
for  and  shipped  HDSL  products  incorporating  E-1  technology.  The  Company
anticipates  that  it  will  develop  additional   products   incorporating  E-1
technology.  ISDN development work is underway to incorporate compatibility with
European ISDN standards and specific in-country network interface  requirements.
Although  the  Company  has  not  yet  fully  developed  its  potential  in  its
international markets and related sales have been modest (3.3% of total sales in
1998),  the Company  believes that  international  markets present a significant
opportunity for growth.




RESEARCH AND PRODUCT DEVELOPMENT

     The  markets  for the  Company's  products  are  characterized  by  rapidly
changing technology,  evolving industry standards and continuing improvements in
telecommunications  service  offerings of common  carriers.  If  technologies or
standards  applicable  to the  Company's  products,  or common  carrier  service
offerings  based on the  Company's  products,  become  obsolete  or fail to gain
widespread  commercial  acceptance,  the  Company's  business  may be  adversely
affected.  Moreover, the introduction of products embodying new technology,  the
emergence  of new  industry  standards  or  changes  in common  carrier  service
offerings could adversely affect the Company's ability to sell its products. For
instance,  a large number of the Company's products have, to date, been designed
to apply  primarily  to the  delivery  of  digital  communications  over  copper
wireline  in the Local  Loop.  While  the  Company  has  competed  favorably  by
developing a high performance  line of products,  it expects that the increasing
deployment of fiber-optic cable, coaxial cable and wireless  transmission in the
Local Loop (each of which uses a  significantly  different  process of delivery)
will require  that it develop new products to meet the demands of these  markets
when  such  markets  are  sufficiently  established.  The  Company's  sales  and
profitability in the past have resulted to a significant extent from its ability
to anticipate  changes in  technology,  industry  standards  and common  carrier
service offerings,  and to develop and introduce new and enhanced products.  The
Company's continued ability to adapt will be a significant factor in maintaining
or improving its competitive  position and its prospects for growth.  Therefore,
the  Company  will  continue  to  make   significant   investments   in  product
development,  although  there can be no assurance that the Company will have the
resources  necessary  to continue  this  strategy  successfully  or to otherwise
respond  appropriately  to changing  technology,  industry  standards and common
carrier  service  offerings.   See  "Management's  Discussion  and  Analysis  of
Financial  Condition and Results of  Operations"  in the  Company's  1998 Annual
Report to Stockholders.

     As of December 31, 1998, the Company's  product  development  programs were
carried out by 295  engineers  and  engineering  support  personnel,  comprising
approximately 24% of the Company's  employees.  To date, all product development
expenses  have  been  charged  to  operations  as  incurred.  From time to time,
development  programs  are  conducted  by other  firms under  contract  with the
Company,  and related costs are also charged to  operations as incurred.  During
1998,  1997 and 1996,  product  development  expenditures  totaled  $37,221,780,
$30,055,091  and  $24,647,425,   respectively.  Because  the  Company's  product
development  activities  are an  important  part of its  strategy and because of
rapidly changing technology and evolving industry standards, the Company expects
to spend more in product development activities in 1999 than it did in 1998.

     The Company's product development  personnel are organized into teams, each
of which is effectively  dedicated to a specific product line or lines. However,
because the Company services each of the Telco and CPE markets,  and because all
of the products in each of the markets share certain similarities,  the benefits
of the Company's  product  development  efforts  generally are not confined to a
particular market, but can be leveraged to the Company's advantage in all of its
markets. As of December 31, 1998, product development teams were assigned to the
following product lines: Loop products, Network products, HDSL products, DSU and
Frame Relay products,  T-1 multiplexer products,  ISDN Telco products,  ISDN CPE
products,   strategic  products  and  extended  range  products.   In  addition,
engineering  services and advanced technology groups provide support for all the
product   development   teams.  Each  product   development  team  is  generally
responsible for sustaining technical support of existing products, improving the
cost or manufacturing  of products,  conceiving new products in cooperation with
other groups  within the Company and adapting  standard  products or  technology
under supply contracts to other firms. In particular,  each product  development
team is charged with implementing the Company's engineering strategy of reducing
product costs for each  succeeding  generation  of the Company's  products in an
effort  to be a low  cost,  high  quality  provider  in  the  industry,  without
compromising functionality or serviceability. This strategy has involved setting
a price  point  for the next  generation  of any given  product  with the aim of
meeting  that  price  point  through  innovative  engineering.  The  key to this
strategy is choosing  an initial  architecture  for each  product  that  enables
engineering  innovations  to  result  in  future  cost  reductions.   Successful
execution of this strategy  also  requires that the Company  continue to attract
and recruit  outstanding  engineers,  and the continued success of the Company's
recruiting program at Southeastern universities is critical to this effort.

     The  product  development  teams are  supported  by a  research  group that
provides guidance in applicable digital signal processing technologies, computer
simulation  and modeling,  CAD/CAM tool sets,  custom  semiconductor  design and
technological  forecasting.  As product  and  market  opportunities  arise,  the
organizational structure may be adjusted accordingly.  The Company's development
process is conducted in  accordance  with ISO 9001,  which is the  international
standard for quality management systems for design, manufacturing and service.

     The Company  believes that its success in the past has been  dependent upon
the ability of its  engineering  team to  establish  and  maintain a position of
product  and  technological  leadership,  and its  success in the future will be
equally  dependent upon the evolution of new forms of existing  products and the
development  of  new  products  fulfilling  the  needs  of  current  and  future
customers.  Therefore, the Company will continue to make significant investments
in product development.

CUSTOMERS

     The  Company's  customer  base  includes  each of the RBOCs and most of the
major independent domestic Telcos. The major customers of the Company include:

     Alltel   Corporation                         Hong Kong Telecom
     Ameritech Corp.                              Ingram Micro
     Azteca Telecommunications                    Interlink
     Bell Atlantic Network Services               Metro Marketing
     BellSouth Corp.                              R-Tec
     Bloomberg  L.P.                              Southwestern Bell Corp
     Cincinnati Bell                              Sprint Corp.
     Cisco Systems, Inc.                          Tech Data Corp.
     Eltrax                                       U.S. West, Inc.
     GTE Corp.


     Historically,  a large  percentage of the Company's  sales have been to the
RBOCs (29% in 1998) and other Telcos (33.9% in 1998).  GTE and Sprint  accounted
for 20.3% and 12.4%,  respectively,  of the  Company's  total sales in 1998.  No
other customer accounted for 10% or more of the Company's sales in 1998.

     A supplier such as the Company must first obtain product  approvals from an
RBOC or other  Telco to sell its  products to such RBOC or Telco.  The  Company,
therefore,  is  involved  in a  constant  process  of  submitting  for  approval
succeeding  generations  of  products  as  well  as  products  that  deploy  new
technology  or respond to a new  technology  demand from an RBOC or other Telco.
While the Company has been  successful in the past in obtaining such  approvals,
there can be no assurance  that such  approvals  or that sales of such  products
will continue to occur.  Further,  any attempt by an RBOC or other Telco to seek
out  additional or  alternative  suppliers or to undertake,  as permitted  under
applicable regulations,  the production of such products internally could have a
material  adverse effect on the Company's  operating  results.  See  "Government
Regulation."


MARKETING, SALES AND DISTRIBUTION

     As of December 31, 1998, the Company's  marketing,  sales and  distribution
programs were conducted by 166  employees.  The Company sells its Telco products
in the United  States and Canada  directly  to the Telcos  through a field sales
organization based in 48 locations (some of these locations are home offices) in
the United States. The Company sells its Telco products  internationally through
field sales offices and various distribution  arrangements with a geographically
dispersed  set of  distributors.  The  Company  sells  its  CPE  products,  both
domestically and  internationally,  through a network of resellers.  The Company
has formed, and will continue to pursue, international distribution arrangements
built upon core products and technology developed by the Company in an effort to
further its penetration into international  markets.  Although the international
market  channel has not yet been fully  developed  and related  revenue has been
modest,  the Company believes that  international  markets present a significant
opportunity for growth, and the Company continues to focus effort on positioning
itself to take advantage of such opportunity.

     Sales   to   Telcos   involve   protracted   product    qualification   and
standardization   processes  that  can  extend  for  several  months  or  years.
Subsequent  orders,  if any, are  generally  placed  under single or  multi-year
supply agreements that are generally not subject to minimum volume  commitments.
Telcos  generally  prefer  having two or more  suppliers  of most  products,  so
individual orders are generally subject to competition based on some combination
of price,  delivery and other terms.  CPE products are sold under both exclusive
and non-exclusive distribution agreements.

     The Company's field sales  organizations  and distributors  receive support
from  headquarters-based  marketing,  sales and customer  support groups.  Under
certain circumstances, other headquarters personnel may become involved in sales
and other activities. The Company believes that its success in the past has been
dependent to a significant degree upon the ability of its sales and distribution
teams to compete  effectively in a highly competitive  environment that includes
firms with greater financial resources and more experience than the Company. The
Company's  success in the future will depend in part upon its ability to attract
and retain  qualified sales and marketing  personnel who can compete and succeed
in this environment.

CUSTOMER SERVICE AND SUPPORT

     The Company  maintains  24-hour,  7 day a week telephone support for all of
its customers,  as customers often demand an immediate response to problems with
installed  products or with plans for new  installations.  The Company  provides
on-site support in those  circumstances  in which problems  cannot  otherwise be
resolved.  It has  generally  been the Company's  policy to follow  through with
problem resolutions even after it is established that the Company's products are
not the source of the difficulty.  The Company provides direct  installation and
service  of its  products  in  North  America  utilizing  its own  resources  or
resources  available  under a nationwide  services  contracts with TSS (formerly
General  Electric) and Data General for installation and service.  International
Business  Machines  Corporation  ("IBM") purchased  General  Electric's  service
division in 1995 and General Electric assigned the Company's service contract to
IBM under the terms of their  sale  agreement.  The  Company  has  approved  the
assignment.  The Company also provides training to its customers (on both a paid
and complimentary basis) relative to installation,  operation and maintenance of
the Company's products.

     Substantially  all  of  the  Company's  products  carry  a  full  ten  year
return-to-factory  warranty.  Warranty  returns  to date  have  been  relatively
insignificant  (less than 1%). The Company  believes that its low return rate is
the direct result of its commitment to a rigorous  product  quality program that
has garnered it special  recognition by several key customers.  The Company also
offers annual  maintenance  agreements  to its customers  which provide that, in
exchange for an annual fee, the Company will provide on-site  service,  within a
specified  time,  in  response  to  any  reported  difficulties  in  the  use or
performance of the Company's products.

MANUFACTURING

     The  principal  steps in the  manufacturing  process are the  purchase  and
management  of  materials,  assembly,  testing,  final  inspection,  packing and
shipping.  The  Company  purchases  parts and  components  for  assembly  of its
products from a large number of suppliers through a worldwide  sourcing program.
However,  certain key  components  used in the Company's  products are currently
available from only one source, and other key components are available from only
a limited number of sources.  In the past, the Company has experienced delays in
the receipt of certain of its key  components,  which have resulted in delays in
related product  deliveries.  The Company  attempts to manage such risks through
developing alternative sources,  through engineering efforts designed to obviate
the necessity of certain components,  and by maintaining  quality  relationships
and close personal contact with each of its suppliers.  However, there can be no
assurance  that delays in deliveries of key components  (including  particularly
integrated  circuits as discussed in greater detail below) and consequent delays
in product  deliveries  will not occur in the future.  The  inability  to obtain
sufficient key components as required,  or to develop alternative sources if and
as required  in the  future,  could  result in delays or  reductions  in product
shipments  which, in turn, could have a material adverse effect on the Company's
customer relationships and operating results.

     The  Company  relies on  subcontractors  in the United  States,  Mexico and
Taiwan for  assembly  of printed  circuit  board  assemblies,  sub-  assemblies,
chassis, enclosures and equipment shelves. The Company subcontracts the assembly
of a  significant  portion of its lower priced  products to companies in Mexico.
Such assembly  typically can be done by  subcontractors  at a lower cost than if
the Company assembled such items  internally,  which furthers the Company's goal
of being a low cost, high quality provider in the industry. Subcontract assembly
operations do, however,  contribute significantly to production cycle times, but
the Company  believes it can respond more rapidly to  uncertainties  in incoming
order rates by selecting  assembly  subcontractors  having  significant  reserve
capacity.  This reliance on third-party  subcontractors  for the assembly of its
products   involves   several  risks,   including  the   unavailability   of  or
interruptions in access to certain process technologies and reduced control over
product quality, delivery schedules, manufacturing yields and costs. These risks
may  be  exacerbated  by  economic  or  political  uncertainties  or by  natural
disasters in foreign  countries  in which the  Company's  subcontractors  may be
located.  The Company currently does not undertake any foreign exchange risks as
it conducts all transactions with foreign vendors or customers in U.S. dollars.

     The  Company is heavily  dependent  on five  subcontractors.  To date,  the
Company believes that it has  successfully  managed the risks of such dependence
on these subcontractors  through a variety of efforts, which include seeking and
developing alternative  subcontractors while maintaining existing relationships.
However,  there can be no assurance  that delays in product  deliveries  may not
occur in the future  because of shortages  resulting from this limited number of
subcontractors or from the financial or other difficulties of such parties.  The
inability to develop alternative subcontractors if and as required in the future
could result in delays or reductions in product  shipments which, in turn, could
have a material  adverse  effect on the  Company's  customer  relationships  and
operating results. While the Company believes that alternative sources of supply
or alternative  subcontractors could be developed if necessary,  material delays
or  interruption  of  supply  might,  nevertheless,  arise as a  consequence  of
required  retraining and other activities related to establishing and developing
a new supply or  subcontractor  relationship and such material delays may have a
material adverse effect on the Company's business and operating results.

     Basically,  final  testing and shipment of products to customers  occurs in
the Company's  Huntsville,  Alabama  facilities.  The Company's  facilities  are
certified  pursuant to ISO 9001 and certain other telephone  company  standards,
including  those  relating  to  emission  of  electromagnetic  energy and safety
specifications.

BACKLOG AND INVENTORY

     A  substantial  portion of the  Company's  shipments  in any fiscal  period
relate to orders  received in that period and firm purchase  orders  released in
that fiscal period by customers under agreements containing non-binding purchase
commitments. Further, a significant percentage of orders require delivery within
48 hours.  These  factors  result in very  little  order  backlog.  The  Company
believes that because a substantial portion of customer orders are filled within
the fiscal  quarter  of  receipt,  the  Company's  backlog  is not a  meaningful
indicator of actual sales for any succeeding  period.  To meet this demand,  the
Company  maintains  a  substantial  finished  goods  inventory.  

     The Company's practice of maintaining sufficient inventory levels to assure
prompt  delivery of the  Company's  products  increases  the amount of inventory
which may  become  obsolete.  The  obsolescence  of such  inventory  may have an
adverse effect on the Company's business and operating results.

COMPETITION

     The markets for the Company's products are intensely competitive.  With the
development  of the worldwide  communications  market and the growing demand for
related equipment,  additional  manufacturers have entered the markets in recent
years to offer products in competition with the Company.  Additionally,  certain
companies  have, in recent years,  developed the ability to deliver fiber- optic
cable,  coaxial cable and wireless  transmission  to certain  office centers and
other end-users.  Competition  would further increase if new companies enter the
market or  existing  competitors  expand  their  product  lines.  For  instance,
legislation  has been  enacted  that  lifts  the  restrictions  that  previously
prevented the RBOCs from manufacturing  telecommunications equipment. The RBOCs,
which in the aggregate are the Company's  largest  customers,  may  increasingly
become  competitors  of the Company in the markets  served by the  Company.  See
"Government Regulation" below.

     The Company  competes for customers on the basis of performance in relation
to price,  product  features,  adherence  to  standards,  quality,  reliability,
development  capabilities,  availability  and  support.  Some  of the  Company's
competitors and potential  competitors  have greater  financial,  technological,
manufacturing, marketing, and personnel resources than the Company.

     With  respect to Telco  sales,  product  quality  and  availability  and an
established  reputation for customer service are important  competitive  factors
that can affect the Company's ability to have its products accepted and approved
by  the  individual  Telcos.  The  Company's  Telco  competitors  include  large
established firms such as ADC  Telecommunications,  Inc.,  Lucent  Technologies,
Inc., PairGain Technologies,  Inc., Pulse Communications,  Inc. (a subsidiary of
Hubbell  Incorporated),  Tellabs,  Inc. and Teltrend,  Inc., as well as smaller,
specialized firms.

     With the  introduction  of its CPE product  lines,  the  Company  entered a
market segment with entrenched  competitors.  Among the significant  competitors
for standard rate DSU market share are Paradyne  Corporation and  Racal-Datacom,
Incorporated.  Market segment  leaders for TSU products  include ADC KENTROX,  a
subsidiary  of  ADC  Telecommunications,  Inc.,  Paradyne  Corp.,  Digital  Link
Corporation and Visual Networks,  Inc. The Company's  multiplexer product line's
key competitors include Newbridge Networks  Corporation,  Pulse  Communications,
Inc., Carrier Access Corporation and Premisys  Communications,  Inc. An increase
in  competition  could reduce the Company's  gross profit  margins,  may require
increased  spending  by  the  Company  on  product  development  and  sales  and
marketing, and may otherwise adversely affect the Company's business.

GOVERNMENT REGULATION

     The  telecommunications  industry  is subject to  regulation  in the United
States and other countries. Federal and state regulatory agencies, including the
Federal  Communications  Commission  (the  "FCC") and the various  state  public
utility  commissions  and  public  service  commissions,  regulate  most  of the
Company's  domestic Telco  customers.  While such  regulation does not typically
affect the Company  directly,  the effects of such  regulation  on the Company's
customers may, in turn,  adversely  impact the Company's  business and operating
results. For instance, the sale of the Company's products may be affected by the
imposition upon certain of the Company's customers of common carrier tariffs and
the taxation of telecommunications  services.  In addition,  regulatory policies
affecting  the  availability  of common  carrier  services  (such as  high-speed
digital  transmission  lines) and other terms on which common  carriers  conduct
their business may impede the Company's  penetration of certain  markets.  These
policies  are under  continuous  review and are subject to change.  Governmental
authorities also have promulgated  regulations  which,  among other things,  set
installation and equipment standards for private  telecommunications systems and
require  that all  newly  installed  hardware  be  registered  and meet  certain
governmental standards.

     Other  governmental  authorities,  such as federal and state courts and the
United  States  Department  of Justice,  have been in the past,  and will likely
continue  in the future to be, a major  force in shaping the manner in which the
telecommunications  business is  conducted  and  telecommunication  services are
provided. For instance, the United States  telecommunications  industry was also
significantly  impacted by the  landmark  Modification  of Final  Judgment  (the
"MFJ"),  which  governed the  structure of the 1984  divestiture  by AT&T of its
local  operating  telephone  company   subsidiaries  (the   Divestiture").   The
Divestiture increased competition in the U.S. telecommunications industry by (i)
eliminating  the  monopoly  power that AT&T had  enjoyed  for years in most U.S.
local and long  distance  telephone  service  and  equipment  markets,  and (ii)
prohibiting the RBOCs that emerged from the Divestiture from engaging in certain
lines of business,  including the  provision of long  distance  services and the
manufacture  of  telecommunications  equipment.  The  terms  of the  Divestiture
provide,  however,  for the removal of the line of business  prohibitions if the
rationale  therefor  becomes  outmoded by technical  developments or changes in
competitive conditions.

     The Telecommunications Act of 1996 covers a broad range of topics that will
dramatically affect the telecommunications  industry.  RBOCs now will be allowed
to manufacture  equipment  three years after they are eligible to enter the long
distance  business.  The RBOCs, which are among the Company's largest customers,
may increasingly become competitors of the Company in the markets it serves. The
Telecommunications  Act of 1996 also  provides for RBOCs to enter long  distance
markets under  certain  conditions  and long  distance  carriers may now provide
local service.

     The Company's business and operating results may also be adversely affected
by the imposition of certain  tariffs,  duties and other import  restrictions on
components  which the Company  obtains from  non-domestic  suppliers,  or by the
imposition  of  export   restrictions   on  products  which  the  Company  sells
internationally.



PROPRIETARY RIGHTS

     The  name  "ADTRAN"  and  the  Company's   corporate  logo  are  registered
trademarks of the Company.  A number of the Company's  product  identifiers  and
names  are also  registered.  The  Company  also  claims  rights  to a number of
unregistered trademarks. The Company has obtained patents on thirteen inventions
relating  to its  products  and has several  patent  applications  pending.  The
Company will seek  additional  patents from time to time related to its research
and  development  activities.  The Company  protects  its  trademarks,  patents,
inventions, trade secrets, and other proprietary rights by contract,  trademark,
copyright and patent registration,  and internal security.  Management believes,
however, that the Company's competitive success will not depend on the ownership
of  intellectual  property  rights,  but  primarily  on the  innovative  skills,
technical  competence and marketing  abilities of the Company's  personnel.  The
telecommunications industry,  nevertheless, is characterized by the existence of
an  ever  increasing  number  of  patents  and  frequent   litigation  based  on
allegations of patent infringement.  From time to time, third parties may assert
exclusive  patent,   copyright  and  other   intellectual   property  rights  to
technologies  that are important to the Company.  While there are no outstanding
infringement  lawsuits  pending  by or  against  the  Company,  there  can be no
assurance  that third  parties  will not assert  litigation  claims  against the
Company in the future, that assertions by such parties will not result in costly
litigation,  or that the Company would prevail in any such litigation or be able
to license any valid and infringed  patents from third  parties on  commercially
reasonable terms. Any infringement  claim or other litigation  against or by the
Company  could have a material  adverse  effect on the  Company's  business  and
operating results.


EMPLOYEES

     As of December  31, 1998 the Company had 1,222  full-time  employees in the
United  States,  three in Canada and one in Hong Kong.  Of the  Company's  total
employees,  340 were in sales, marketing,  distribution and service, 295 were in
research  and  development,   443  were  in  manufacturing,   and  148  were  in
administration.  None of the Company's  employees is represented by a collective
bargaining  agreement nor has the Company ever  experienced  any work  stoppage.
Management believes the Company's relationship with its employees is good.


ITEM 2.  PROPERTIES

     The Company's  headquarters and principal  administrative,  engineering and
manufacturing  facilities are located in an office building  containing  440,000
square feet located on  approximately  22 acres of land in Huntsville,  Alabama.
The  Company  also  leases  65,480   additional   square  feet  to   accommodate
manufacturing and engineering activities. Construction is underway to expand its
facilities in Huntsville by approximately  600,000 square feet (to accommodate a
projected  total of 3,000  employees) over the next two years at a cost expected
to exceed  $150,000,000,  of which $56,585,000 had been incurred at December 31,
1998.  See  "Management's  Discussion  and Analysis of Financial  Condition  and
Results of Operations - Liquidity and Capital  Resources" in the Company's  1998
Annual Report to Stockholders and Note 6 of Notes to Financial Statements.

     The Company  also  maintains  48 sales and service  facilities,  45 located
within the United  States,  two in Canada and one in Hong Kong, in the following
locations:  Huntsville, AL, Irvine, CA, San Francisco, CA, Denver, CO, Hartford,
CT, Atlanta, GA, Chicago, IL, Bativia, IL, Darien, IL, Orland Park, IL, Leawood,
KS, Trenton,  NJ, New York, NY, Cleveland,  OH,  Philadelphia,  PA, Irving,  TX,
Washington,  DC and  Ontario and  Quebec,  Canada.  In addition to the leases in
Huntsville,  AL, the facilities in Leawood, KS, Irvine, CA, Denver, CO, Atlanta,
GA, Irving, TX, Altamonte Springs, FL, Herndon, VA, Crystal Lake, IL, Bainbridge
Island, WA, and Philadelphia, PA are leased under leases which expire at various
times between 1999 and 2005. See Note 8 of Notes to Financial Statements.

ITEM 3.  LEGAL PROCEEDINGS

     The Company has been involved from time to time in litigation in the normal
course of its  business.  The Company is not aware of any pending or  threatened
litigation matters that could have a material adverse effect on the Company.
<PAGE>

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

     No matter was submitted by the Company to vote of security  holders  during
the fiscal quarter ended December 31, 1998.

ITEM 4(A).  EXECUTIVE OFFICERS OF THE REGISTRANT

     Set forth below, in accordance with General  Instruction  G(3) of Form 10-K
and  Instruction  3 of Item 401(b) of  Regulation  S-K,  is certain  information
regarding the executive officers of the Company. Unless otherwise indicated, the
information set forth is as of December 31, 1998.

Mark  C.  Smith  -  Age 58 -  Mr. Smith is one of the co-founders  of
                                the Company.
           1995 to present    Chairman of the Board and Chief Executive Officer
           1986  -  1995      Chairman of the Board, Chief Executive Officer and
                                President


Lonnie  S. McMillian - Age 70 Mr. McMillian is one of the co-founders of the
                                Company
           1996  to present   Senior Vice President, Secretary  and Director
           1986  -  1996      Vice  President -  Engineering,  Secretary,
                                Treasurer and Director


Howard A. Thrailkill   -  Age 60
           1995  to  present  President, Chief Operating Officer and Director
           November 1995      Executive Vice President, Chief Operating Officer
                                and Director
           1992 - 1995        Executive Vice President, Chief Operating Officer


John R. Cooper  -  Age 51
           1996  to present   Vice President - Finance and Chief Financial
                                Officer
           1995 - 1996        President, Sauty Group
           1991 - 1995        Partner, Coopers & Lybrand L.L.P.


Danny J. Windham  -  Age 39
           1995 to present    Vice President - CPE Marketing
           1994 - 1995        Director of Marketing
           1989 - 1994        Manager of Product Management


Thomas R. Stanton  -  Age 34
           1995 to present    Vice President  - Telco Marketing
           1995               VP - Marketing  & Engineering, Transcrypt
                                International
           1994  -  1995      Sr.  Director, Marketing,  E.F.Johnson Company
           1993     1994      Director, Marketing, E.F. Johnson Company


Peter O. Brackett  -  Age  57
           1996 to present    Vice President - Technology
           1992 - 1996        Research Manager, Advanced Data Networking,
                                Bellsouth


M. Melvin Bruce  -  Age 58
           1996 to present    Vice President - Engineering
           1989 - 1996        Vice President, Research and Design, TCI



Robert A.  Fredrickson  -  Age 48
           1996 to present    Vice President - Telco Sales
           1996               Vice   President, Broadband Business Development,
                                DSC Communications Corp.
           1991-1996          Senior  Director,  Access  Products,  DSC
                                Communications Corp.


Steven L. Harvey  -  Age 38
           1996 to present   Vice President  - CPE Sales
           1995 - 1996       Executive Vice President, Data Processing Sciences
           1991 - 1995       Vice President, Data Processing Sciences


Charles A. O'Donnell  - Age  44
           1996 to present   Vice President  -  Quality
           1993  - 1996      Quality & Technical Resources Manager, Exide
                               Electronics Corp.


Jude T. Panetta  -  Age 39
           1994 to present   Vice President - Manufacturing
           1989 - 1994       Director of Manufacturing, Exide Electronics

     There  are  no  family  relationships  among  the  directors  or  executive
officers.

     All officers are elected annually by and serve at the pleasure of the Board
of Directors of the Company.


<PAGE>

                             PART II



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

     The Company's  Common Stock has been traded on the Nasdaq  National  Market
(Nasdaq) under the symbol "ADTN" since the Company's  initial public offering of
Common Stock in August 1994. Prior to the initial public offering,  there was no
established  trading  market for the Company's  Common Stock.  As of January 31,
1999,  the  Company  had 647  shareholders  of record and  approximately  13,500
beneficial  owners of shares held in street name. The following  table shows the
high and low sale  prices per share for the Common  Stock as  reported by Nasdaq
for the periods indicated:

         1998 Quarters        High             Low

         First                $34-3/4          $24
         Second               $29-3/4          $19-5/8
         Third                $29-1/8          $20-1/2
         Fourth               $28-7/8          $15-5/8

         1997 Quarters        High             Low

         First                $53-1/4          $22-1/2
         Second               $35-5/8          $20-7/8
         Third                $44              $23
         Fourth               $45-1/2          $26


     The Company has  operated  with a policy of retaining  earnings,  presently
intends to retain all future earnings for use in the development of its business
and does not anticipate paying any cash dividends in the foreseeable future.
<PAGE>



   ITEM 6.    SELECTED FINANCIAL DATA

     The following  selected financial data concerning the Company for and as of
the end of each of the years in the five year period  ended  December  31, 1998,
are  derived  from the  financial  statements  of the  Company,  which have been
audited by  PricewaterhouseCoopers  LLP, independent  accountants.  The selected
financial data are qualified in their entirety by the more detailed  information
and financial statements,  including the notes thereto. The financial statements
of the Company as of December 31, 1998 and 1997 and for each of the years in the
three   year   period   ended   December   31,   1998,   and   the   report   of
PricewaterhouseCoopers LLP thereon, are included elsewhere in this report.
<TABLE>
<CAPTION>

  Year Ended December 31,                        1998         1997         1996         1995        1994
  (in thousands, except per share data)
<S>                                           <C>           <C>         <C>          <C>         <C>
  INCOME STATEMENT DATA:
  Sales
       Telco                                  $167,500      $171,838     $171,902     $121,311    $87,888
       CPE                                     119,059        93,497       78,219       60,167     35,552
                                              ------------------------------------------------------------
            Total sales                        286,559        265,335     250,121      181,478    123,440
  Cost of Sales                                130,010        130,254     129,953       93,007     63,187
                                               -----------------------------------------------------------
            Gross profit                       156,549        135,081     120,168       88,471     60,253
  Selling, general and                          
    administrative expenses                     62,061         44,973      34,308       27,260     17,347
  Research  and  development expenses           37,222         30,055      24,648       19,131     13,774
                                              -----------------------------------------------------------
           Operating income                     57,266         60,053      61,212       42,080     29,132
  Interest income                                5,824          4,175       2,543        3,205        440
  Interest expense                              (2,287)        (1,839)       (895)      (1,105)      (448)
  Other income (expense)                          (188)           438         642          111        (25)
                                              ------------------------------------------------------------
           Income before income taxes           60,615         62,827      63,502       44,291     29,099
  Provision for income taxes (1)                20,306         22,618      23,682       14,833     10,490
                                             ------------------------------------------------------------
           Net income                           40,309         40,209      39,820       29,458     18,609

  Earnings per common share
    assuming dilution (2)                         1.03           1.02        1.01          .75        .51
  Earnings per common share-basic (2)             1.03           1.03        1.03          .80        .56
                                              -----------------------------------------------------------
  Weighted average shares outstanding          
    assuming dilution (2)                       39,164         39,565      39,549       39,249     36,199



  At December 31,                                1998          1997         1996          1995       1994
 (in  thousands, except per share data)

  BALANCE SHEET DATA
  Working Capital                             $150,535       $149,184    $140,510     $122,466     $66,368
  Total assets                                 301,711        282,401     210,207      165,767      94,347
  Total debt                                    50,000         50,000      20,000       20,000           0
  Stockholders' equity                         231,389        212,037     172,879      130,743      85,233

</TABLE>
(1)  Effective July 1, 1994, the Company  converted from an S corporation to a C
     corporation for income tax purposes.  As an S corporation,  the Company was
     not subject to income taxes but paid quarterly cash  distributions  to fund
     the income tax  liabilities  passed  through  to the  stockholders.  As a C
     corporation, the Company is subject to income taxes at corporate tax rates.
     The  provision  for income  taxes for 1994  includes a pro forma  amount of
     $4,202 for the period from January 1, 1994 to July 1, 1994.

(2)  Assumes  exercise of dilutive stock options  calculated  under the treasury
     stock method. See Note 1, 9 and 13 of Notes to Financial Statements.
<PAGE>

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

OVERVIEW

     The Company designs, develops,  manufactures,  markets and services a broad
range of  high-speed  digital  transmission  products  utilized  by  Telcos  and
corporate  end-users to implement  advanced  digital data services over existing
telephone  networks.   The  Company  currently  sells  its  products  to  Telcos
(including all of the RBOCs) and private end-users in the CPE market.

     The Company's  sales have increased in each year due primarily to increases
in the number of units sold to both new and  existing  customers.  These  annual
sales  increases  reflect the Company's  strategy of increasing  unit volume and
market share  through the  introduction  of succeeding  generations  of products
having lower selling prices and increased  functionality as compared both to the
prior  generation of a product and to the products of competitors.  An important
part of the Company's  strategy is to engineer the reduction of the product cost
of each  succeeding  product  generation  and then to lower the product's  price
based on the cost  savings  achieved.  As a part of this  strategy,  the Company
seeks in most instances to be a low-cost,  high-quality  provider of products in
its markets.  The Company's  success to-date is attributable in large measure to
its ability to  initially  design its products  with a view to their  subsequent
re-design,  allowing  efficient  enhancements  of the product in each succeeding
product  generation.  This  strategy has enabled the Company to sell  succeeding
generations of products to existing  customers as well as to increase its market
share by selling these enhanced products to new customers.

     While  the  Company  has  experienced  increased  sales in each  year,  the
Company's  operating  results have  fluctuated on a quarterly basis in the past,
and operating  results may vary  significantly in future periods due to a number
of factors.  The Company operates with very little order backlog.  A substantial
majority of its sales in each quarter results from orders booked in that quarter
and firm purchase orders released in that quarter by customers under  agreements
containing non-binding purchase commitments.  Furthermore, most Telcos typically
require prompt delivery of products. This results in a limited backlog of orders
for these  products and requires  the Company to maintain  sufficient  inventory
levels to  satisfy  anticipated  customer  demand.  If near term  demand for the
Company's products declines or if significant  potential sales in any quarter do
not occur as  anticipated,  the  Company's  financial  results will be adversely
affected.  Operating expenses are relatively fixed in the short term; therefore,
a shortfall in quarterly  revenues could impact the Company's  financial results
significantly  in a given quarter.  Further,  maintaining  sufficient  inventory
levels to assure prompt delivery of the Company's  products increases the amount
of  inventory  which  may  become  obsolete  and  increases  the  risk  that the
obsolescence  of such  inventory  may have an  adverse  effect on the  Company's
business  and  operating  results.  The  Company's  operating  results  may also
fluctuate  as a  result  of a  number  of  other  factors,  including  increased
competition,  customer order patterns,  changes in product mix, product warranty
returns and  announcements  of new  products by the Company or its  competitors.
Accordingly, the Company's historical financial performance is not necessarily a
meaningful indicator of future results, and, in general, management expects that
the Company's  financial results may vary from period to period.  See Note 14 of
Notes to Financial Statements.

     The Company  intends to retain all earnings for use in the  development  of
its  business  and  does  not  anticipate  paying  any  cash  dividends  in  the
foreseeable future.

     This 1998 Annual Report contains  "forward-looking  statements"  within the
meaning of Section 21E of the Securities Exchange Act of 1934, as amended, which
represent the Company's expectations or beliefs,  including, but not limited to,
statements  concerning  (i) the business and  financial  outlook of the Company,
(ii) the Company's  business,  financial  condition or results of operations and
(iii) the Company's business strategy. When used in this 1998 Annual Report, the
words  "believe,"  "anticipate,"  "think,"  "intend,"  "will  be,"  and  similar
expressions identify forward-looking  statements. Such statements are subject to
certain  risks and  uncertainties  which  could cause  actual  results to differ
materially  from those  projected.  Readers  are  cautioned  not to place  undue
reliance  on these  forward-looking  statements  which speak only as of the date
hereof.  Readers are also urged to  carefully  review and  consider  the various
disclosures,  including, but not limited to, the disclosures described under the
captions  "Management's  Discussion  and  Analysis of  Financial  Condition  and
Results  of  Operation,"   "1998  Compared  to  1997,"  "Liquidity  and  Capital
Resources,"  and "Year 2000 Readiness  Disclosure,"  and those  discussed in the
Company's  filings with the Securities and Exchange  Commission,  as well as the
general economic conditions and industry trends which could cause actual results
or outcomes to differ  materially  from those  expressed in any  forward-looking
statement of the Company.
Results of Operations

     The following table presents selected  financial  information  derived from
the Company's  statements  of income  expressed as a percentage of sales for the
years indicated.

Years Ended December 31,
Percentage of Sales                        1998         1997         1996
  Sales:
         Telco                             58.5%        64.8%        68.7%
         CPE                               41.5         35.2         31.3
- --------------------------------------------------------------------------
         Total sales                      100.0        100.0        100.0
  Cost of sales                            45.4         49.1         51.9
- --------------------------------------------------------------------------
         Gross profit                      54.6         50.9         48.1
  Selling, general and administrative
        expenses                           21.7         17.0         13.7
  Research and development expense         13.0         11.3          9.9
- --------------------------------------------------------------------------
         Operating income                  19.9         22.6         24.5
  Interest income                           2.0          1.6          1.0
  Interest expense                         (0.8)        (0.7)        (0.4)
  Other income (expense)                    0.1          0.2          0.3
- --------------------------------------------------------------------------
        Income before provision for
           income taxes                    21.2         23.7         25.4
  Provision for income taxes                7.1          8.5          9.5
- --------------------------------------------------------------------------
        Net income                         14.1%        15.2%        15.9%



1998 COMPARED TO 1997

Sales
     The Company's sales increased 8% from  $265,334,768 in 1997 to $286,558,950
in 1998. The increased  sales  resulted from increased  sales volume to existing
customers  and from  increased  market  penetration.  Sales to Telcos  decreased
slightly from  $171,837,883 in 1997 to  $167,499,919  in 1998.  Telco sales as a
percentage of total sales  decreased from 64.8% in 1997 to 58.5% in 1998.  Sales
of CPE products  increased  27.3% from  $93,496,885 in 1997 to  $119,059,030  in
1998. As a percentage of total sales,  CPE sales increased from 35.2% in 1997 to
41.5%  in  1998.  The  increase  in sales of CPE  products  is  attributable  to
increased  demand for T1 Service  Unit (TSU)  products  and Digital Data Service
(DDS) products.

Cost of Sales
     Cost of sales decreased  slightly from $130,253,531 in 1997 to $130,009,879
in  1998,  primarily  as a result  of the  reduction  in  component  cost.  As a
percentage  of sales,  cost of sales  decreased  from  49.1% in 1997 to 45.4% in
1998.  This decrease was due  primarily to the  reduction in component  cost and
product design  enhancements.  Telco cost of sales decreased from $87,269,866 in
1997 to $75,925,769 in 1998.  Telco cost of sales as a percentage of Telco sales
decreased from 50.8% in 1997 to 45.3% in 1998. CPE cost of sales  increased from
$42,983,665 in 1997 to  $54,084,110  in 1998. As a percentage of CPE sales,  CPE
cost of sales  decreased  from 46.0% in 1997 to 45.4% in 1998. An important part
of the  Company's  strategy  is to reduce the  product  cost of each  succeeding
product  generation  and then to lower  the  product's  price  based on the cost
savings achieved. This strategy sometimes results in variations in the Company's
gross profit  margin due to timing  differences  between the lowering of product
selling prices and the full recognition of cost reductions. In view of the rapid
pace of new product  introductions  by the Company,  this strategy may result in
variations in gross profit margins that, for any  particular  financial  period,
can be difficult to predict.


Selling, General and Administrative Expenses
     Selling,   general  and   administrative   expenses  increased  38.0%  from
$44,973,175  in 1997 to  $62,060,907 in 1998. The increase was due to additional
sales and support  expenditures  necessary as a result of the Company's expanded
sales base and increased  dollar amounts of these expenses  associated  with the
ongoing introduction and marketing of enhanced products,  increased distribution
activities   associated  with  the  CPE  market,   and  general  expansion  into
international   markets.  As  a  percentage  of  sales,  selling,   general  and
administrative expenses increased from 17.0% in 1997 to 21.7% in 1998.


Research and Development Expenses
     Research and development  expenses increased 23.8% from $30,055,091 in 1997
to $37,221,780  in 1998.  This increase was due to increased  engineering  costs
associated with new product introductions and feature enhancement activities. As
a percentage of sales, research and development expenses increased from 11.3% in
1997  to  13.0%  in  1998.  The  Company   continually   evaluates  new  product
opportunities and engages in intensive research and product development efforts.
To date, the Company has expensed all product research and development  costs as
incurred.  Additionally,  the  Company  frequently  invests  heavily in up-front
market development  efforts prior to the actual commencement of sales of a major
new  product.  As a result,  the  Company  may incur  significant  research  and
development expenses and selling,  general and administrative  expenses prior to
the receipt of revenues from a major new product group. The Company is presently
incurring  both  research and  development  expenses  and  selling,  general and
administrative  expenses in  connection  with its new products and its expansion
into international markets.


Interest Expense
     Interest  expense  increased 24.4% from $1,838,814 in 1997 to $2,286,821 in
1998.  The Company  currently  pays  interest  on  $50,000,000  of revenue  bond
proceeds of which  $20,000,000  was loaned to the Company in January  1995,  and
$30,000,000  was loaned to the Company in April 1997.  The proceeds were used to
expand the Company's facilities in Huntsville, Alabama. The increase in interest
expense in 1998 was due primarily to a full year's  interest  being  incurred in
1998 on the additional  $30,000,000 borrowed in April 1997 versus only a partial
year in 1997. See also "Liquidity and Capital Resources."

Net Income
     As a result  of the above  factors,  net  income  increased  slightly  from
$40,209,272 in 1997 to $40,309,650 in 1998. As a percentage of sales, net income
decreased from 15.2% in 1997 to 14.1% in 1998.


1997 COMPARED TO 1996

Sales
     The  Company's   sales   increased  6.1%  from   $250,120,836  in  1996  to
$265,334,768  in 1997. The increased  sales resulted from increased sales volume
to existing  customers and from increased  market  penetration.  Sales to Telcos
remained basically  unchanged from $171,901,851 in 1996 to $171,837,883 in 1997.
Telco sales as a percentage of total sales decreased from 68.7% in 1996 to 64.8%
in 1997.  Sales of CPE  products  increased  19.5% from  $78,218,985  in 1996 to
$93,496,885  in 1997. The increase in sales of CPE products is  attributable  to
increased  demand for T1 Service  Unit (TSU)  products and  Integrated  Services
Digital Network (ISDN) products.

Cost of Sales
     Cost of sales  increased 0.2% from  $129,953,371 in 1996 to $130,253,531 in
1997,  primarily as a result of the increase in sales. As a percentage of sales,
cost of sales  decreased from 51.9% in 1996 to 49.1% in 1997.  This decrease was
primarily   attributable  to  manufacturing   efficiencies  and  product  design
enhancements.  Telco  cost  of  sales  decreased  from  $89,277,966  in  1996 to
$87,269,866  in 1997.  As a  percentage  of  Telco  sales,  Telco  cost of sales
decreased from 51.9% in 1996 to 50.8% in 1997. CPE cost of sales  increased from
$40,675,405 in 1996 to  $42,983,665  in 1997. As a percentage of CPE sales,  CPE
cost of sales  decreased  from 52.0% in 1996 to 46.0% in 1997. An important part
of the  Company's  strategy  is to reduce the  product  cost of each  succeeding
product  generation  and then to lower  the  product's  price  based on the cost
savings  achieved.  This sometimes  results in variations in the Company's gross
profit margin due to timing differences  between the lowering of product selling
prices and the full recognition of cost reductions. In view of the rapid pace of
new product introductions by the Company, this strategy may result in variations
in gross profit  margins  that,  for any  particular  financial  period,  can be
difficult to predict.

Selling, General and Administrative Expenses
     Selling,   general  and   administrative   expenses  increased  31.1%  from
$34,308,436 in 1996 to  $44,973,175 in 1997 due to additional  sales and support
expenditures  necessary  as a result of the  Company's  expanded  sales base and
increased  dollar  amounts  of  these  expenses   associated  with  the  ongoing
introduction  and  marketing  of  enhanced  products,   increased   distribution
activities   associated  with  the  CPE  market,   and  general  expansion  into
international   markets.  As  a  percentage  of  sales,  selling,   general  and
administrative expenses increased from 13.7% in 1996 to 17.0% in 1997.


Research and Development Expenses
     Research and development  expenses increased 21.9% from $24,647,425 in 1996
to $30,055,091  in 1997.  This increase was due to increased  engineering  costs
associated with new product introductions and feature enhancement activities. As
a percentage of sales,  research and development expenses increased from 9.9% in
1996  to  11.3%  in  1997.  The  Company   continually   evaluates  new  product
opportunities and engages in intensive research and product development efforts.
To date, the Company has expensed all product research and development  costs as
incurred.  Additionally, the Company also frequently invests heavily in up-front
market development  efforts prior to the actual commencement of sales of a major
new  product.  As a result,  the  Company  may incur  significant  research  and
development expenses and selling,  general and administrative  expenses prior to
the receipt of revenues from a major new product group. The Company is presently
incurring  both  research and  development  expenses  and  selling,  general and
administrative  expenses in  connection  with its new products and its expansion
into international markets.

Interest Expense
     Interest  expense  increased  105.5% from $894,657 in 1996 to $1,838,814 in
1997.  This increase was due to increased  borrowings  during 1997.  The Company
currently  pays  interest  on  $50,000,000  of revenue  bond  proceeds  of which
$20,000,000  was loaned to the  Company in January  1995,  and  $30,000,000  was
loaned to the  Company  in April  1997.  The  proceeds  were used to expand  the
Company's  facilities in Huntsville,  Alabama.  See also  "Liquidity and Capital
Resources."

Net Income
     As  a  result  of  the  above  factors,  net  income  increased  1.0%  from
$39,819,904 in 1996 to $40,209,272 in 1997. As a percentage of sales, net income
decreased from 15.9% in 1996 to 15.2% in 1997.


LIQUIDITY AND CAPITAL RESOURCES

     The Company is continuing a project to expand its facilities in Huntsville,
Alabama  in  phases  over the  next  two  years  at a cost  expected  to  exceed
$150,000,000, of which $56,585,000 had been incurred at December 31, 1998. Fifty
million dollars of this project was approved for  participation  in an incentive
program  offered by the Alabama  State  Industrial  Development  Authority  (the
"Authority"). That incentive program enables participating companies such as the
Company to generate  Alabama  corporate  income tax credits  that can be used to
reduce the amount of Alabama  corporate  income  taxes that would  otherwise  be
payable.  There can be no assurance  that the State of Alabama will  continue to
make these corporate income tax credits available in the future, and the Company
therefore may not realize the full benefit of these incentives. Through December
31, 1998, the Authority had issued taxable revenue bond in the principal  amount
of $50,000,000 pursuant to such program and loaned the proceeds from the sale of
the bond to the  Company.  The  Company  is  required  to make  payments  to the
Authority  in amounts  necessary  to pay the  principal  of and  interest on the
Authority's  Taxable  Revenue  Bond,  Series 1995  (ADTRAN,  Inc.  Project),  as
amended, currently outstanding in the aggregate principal amount of $50,000,000.
Said bond matures on January 1, 2020, and bears interest at the rate of 45 basis
points over the money market rate of First Union National Bank.

     The Company's  working capital  position  improved from  $149,183,578 as of
December 31, 1997 to $150,534,759  as of December 31, 1998. This  improvement in
the Company's working capital position was due primarily to steady earnings. The
Company  has used,  and  expects  to  continue  to use the cash  generated  from
operations for working capital and other general corporate  purposes,  including
(i) product development  activities to enhance its existing products and develop
new products and (ii)  expansion of sales and  marketing  activities.  Inventory
increased  66.9% for the fiscal year ended  December  31,  1998.  This  increase
occurred  during the last six months of the period due to new business  relating
to Total  Reach  technology  and new HDSL  orders  anticipated  from a  contract
awarded to the Company in October 1998.  Sales were weaker than  anticipated  in
the fourth  quarter of 1998 and did not allow the  Company to move the amount of
inventory that was planned.

     On March 31,  1997,  the  Board of  Directors  authorized  the  Company  to
re-purchase up to 1,000,000 shares of the Company's outstanding common stock. In
October 1998,  the Board  approved the  re-purchase  of an additional  2,000,000
shares.  As of December 31, 1998, the Company had re-purchased  1,100,081 shares
of its  common  stock  at a total  cost  of  $23,216,047.

     Capital expenditures totaling  $23,095,854,  $18,220,850 and $29,661,438 in
1998,  1997  and  1996,   respectively,   were  used  to  expand  the  Company's
headquarters and to purchase equipment.

     At December 31, 1998, the Company's cash on hand of $10,009,320, short-term
investments of $40,795,068 and $10,000,000 available under a bank line of credit
placed the Company's  potential cash availability at $60,804,388.  The Company's
$10,000,000  bank line of credit bears interest at the rate of 87.5 basis points
over the 30 day London  inter-bank  offered rate and expires on May 1, 1999. The
Company  anticipates  renewing  the  $10,000,000  bank line of  credit  upon its
expiration.  The Company  intends to finance its  operations  in the future with
cash flow from  operations,  amounts  available  under the bank line of  credit,
borrowed revenue bond proceeds and possible additional public financings.  These
available  sources of funds are  expected to be  adequate to meet the  Company's
operating and capital needs for the foreseeable future.

YEAR 2000 READINESS DISCLOSURE

     The Company conducted a year 2000 program to assess and mitigate the impact
of the year 2000  issue.  The Company  believes  that all  critical  information
technology and non-information technology hardware and software systems are year
2000  compliant,  including,  but not  limited  to,  business  systems,  network
infrastructure,  manufacturing  equipment,  engineering tools, customer products
and plant facilities.

     The Company has completed the inventory and  assessment  phases of its year
2000 program.  The  Company's  operations  are not  dependent  upon older legacy
source  code or  mainframe  computers  as is often  the case with  systems  with
significant year 2000 issues. Therefore, there is little or no date-related code
remediation or conversion necessary to maintain normal business activities.  The
primary  remaining effort in the year 2000 program is to review and validate the
conclusions reached by the Company's year 2000 assessment.  The Company does not
believe that costs associated with bringing the Company's  computer systems into
full  compliance  with the year 2000 issue will result in a material  expense to
the Company.

     In July of 1998, the Company  completed the  implementation of new business
software and hardware which has been determined to be year 2000  compliant.  The
Company is currently upgrading some secondary systems which have been identified
with minor year 2000 issues. Likewise, testing and year 2000 simulations will be
performed  on all  Company  systems  to  verify  date  processing  capabilities.
Expected completion of year 2000 simulations and testing is March 1999.

     The  Company  has  also   contacted   and   assessed  its   suppliers   and
subcontractors  regarding the year 2000 issue and concluded that those suppliers
and subcontractors, which have a material relationship with the Company, are not
expected to cause significant business interruptions to occur as a result of the
year 2000 issue. The Company's assessment of suppliers has identified those most
critical to the Company's  operations and a contingency plan has been drafted to
handle issues in the future.  The Company's primary external  subcontractors are
conducting  their own  independent  internal  year 2000  programs  and are being
assisted by the Company with their year 2000 preparations where appropriate.

     The Company  believes  that its products are year 2000  compliant.  Company
engineers have confirmed product design specifications and have verified product
date processing  functionality.  Customers are provided individual  responses to
product  inquiries and the Company has posted detailed year 2000  information on
its web site.  The  Company  does not  believe  that it will  have any  material
exposure  to  contingencies  related to the year 2000 issue for  products it has
sold.

     Based on information  presently available,  the Company does not anticipate
any material impact on its financial condition or results of operations from the
effect of the year 2000 issue on its internal systems or on those systems of its
major  suppliers  and  customers.  However,  there can be no guarantee  that the
systems of other companies on which the Company relies will be timely converted,
or that a failure  to  convert  by  another  company  would not have a  material
adverse impact on the Company.  Furthermore,  despite the Company's assessments,
there can be no  guarantee  that there will not be a year 2000  problem  arising
from the  Company's  own system that may have a material  adverse  impact on the
Company.

     As of December 31, 1998, the Company had spent  approximately  $100,000 for
year 2000  compliance.  The Company  expects to spend  approximately  $60,000 in
1999.  The Company does not  separately  track these internal costs incurred for
the Y2K  project.  These  costs,  however,  consist  principally  of the related
payroll costs of its information systems group.

<PAGE>

ITEM 7A.  QUANTITATIVE DISCLOSURES ABOUT MARKET RISK

     The Company has not  conducted  transactions,  established  commitments  or
entered into relationships requiring disclosures beyond those provided elsewhere
in this Form 10-k.


ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

The following financial statements are contained in this report.

                                                                     Page
Report of Independent Certified Public Accountants                    24

Financial Statements for Years Ended December 31, 1998,
 1997 and 1996
Balance Sheets                                                        25
Statements of Income                                                  26
Statements of Changes in Stockholders' Equity                         27
Statements of Cash Flows                                              28

Report of Independent Certified Public Accountants on
  Supplementary Information                                           42
Schedule II - Valuation and Qualifying Accounts                       43
<PAGE>

REPORT OF INDEPENDENT ACCOUNTANTS


To the Board of Directors
and Stockholders of ADTRAN, Inc.


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


/s/PricewaterhouseCoopers LLP
Birmingham, Alabama
January 14, 1999

<PAGE>
<TABLE>

BALANCE SHEETS
December 31, 1998 and 1997

                                                 1998                1997
   ASSETS
   <S>                                     <C>                   <C>
   Current Assets:
      Cash and cash equivalents            $10,009,320           $45,340,961
      Short-term investments                40,795,068            37,833,240
     Accounts receivable, less allowance
      for doubtful accounts of $958,805
      and $893,389 in 1998 and 1997,        46,588,319            40,906,887
      respectively
      Other receivables                        697,074               343,463
      Inventory                             65,700,576            39,369,103
      Prepaid expenses                       1,354,366             1,148,288
      Deferred  income taxes                 2,416,685             2,458,136
                                           ---------------------------------
           Total current assets            167,561,408           167,400,078

   Property, plant and equipment,net        78,894,317            64,801,132
   Other assets                                220,000               200,000
   Long-term investments                    55,035,000            50,000,000
                                           ----------------------------------
           Total assets                   $301,710,725          $282,401,210



   LIABILITIES AND STOCKHOLDERS' EQUITY

   Current liabilities:
      Accounts payable                    $ 10,980,097           $ 9,121,270
      Accrued salaries                       1,828,462             1,927,364
      Accrued income taxes                   1,060,795             4,579,345
      Accrued taxes other than income
        taxes                                  252,548               180,611
      Warranty liability                     1,519,945             1,435,259
      Compensated absences                   1,384,802               972,651
                                           ----------------------------------
           Total current liabilities        17,026,649            18,216,500
   Bonds payable                            50,000,000            50,000,000
   Deferred income taxes                     3,295,140             2,147,635
                                           ----------------------------------
                                            70,321,789            70,364,135
   Total liabilities

   Stockholders' equity:
      Common stock, par value $.01 per
       share; 200,000,000 shares
       authorized; 39,423,479 shares
       issued in 1998 and 39,381,264
       in 1997                                 394,235               393,813
     Additional paid-in capital             90,640,451            90,582,615
     Retained earnings                     163,570,297           123,260,647
                                           ---------------------------------
                                           254,604,983           214,237,075

     Less treasury stock at cost:
      1,100,081 and 100,000 shares
      in 1998 and  1997, respectively      (23,216,047)           (2,200,000)
                                          -----------------------------------
   Total stockholders'equity               231,388,936           212,037,075
                                          -----------------------------------
   Total liabilities and                  $301,710,725          $282,401,210
    stockholders' equity
</TABLE>

   The accompanying notes are an integral part of these financial statements.

<PAGE>

<TABLE>

STATEMENTS OF INCOME
for the years ended December 31, 1998, 1997 and 1996


                                            1998               1997                  1996
<S>                               <C>               <C>               <C>    
Sales                                    $286,558,950      $265,334,768       $250,120,836
Cost of sales                             130,009,879       130,253,531        129,953,371
                                          -------------------------------------------------
     Gross profit                         156,549,071       135,081,237        120,167,465


Selling, general and administrative
 expenses                                  62,060,907        44,973,175         34,308,436
Research and development expenses          37,221,780        30,055,091         24,647,425
                                         -------------------------------------------------
   Income from operations                  57,266,384        60,052,971         61,211,604

Other income (expenses):
     Interest income                        5,824,223         4,175,032          2,542,417
     Interest expense                      (2,286,821)       (1,838,814)          (894,657)
     Other                                   (188,530)          437,639            642,432
                                       ---------------------------------------------------
                                            3,348,872         2,773,857          2,290,192

Income before income taxes                 60,615,256        62,826,828         63,501,796
Provision for income taxes                 20,305,606        22,617,556         23,681,892
                                       ---------------------------------------------------
               Net income                 $40,309,650       $40,209,272        $39,819,904


Weighted average shares
 outstanding assuming dilution (1)         39,163,763        39,565,497         39,548,654

Earnings per common share -                     
 assuming dilution (1)                          $1.03             $1.02              $1.01
Earnings per common share - basic               $1.03             $1.03              $1.03
</TABLE>


The accompanying notes are an integral part of these financial statements.



(1)  Assumes exercise of dilutive stock options calculated under the
treasury stock method.

<PAGE>

<TABLE>
<CAPTION>

STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY
for the years ended December 31, 1998, 1997 and 1996

                                           Common Stock
                                    Number          Par Value      Additional     Retained       Treasury         Total
                                  of shares         ($.01 Per       Paid-In       Earnings         Stock      Stockholders'
                                                       Share)       Capital                                       Equity
<S>                              <C>                <C>           <C>            <C>            <C>          <C>

Balance,December 31, 1995         37,462,275        $374,623      $89,404,177    $40,964,511          $0      $130,743,311

Stock options exercised:
  Various prices per share          1,307,239          13,072         768,686                                      781,758
Income tax benefit from exercise
  of non-qualified stock options                                                   1,533,926                     1,533,926
Net income                                                                        39,819,904                    39,819,904
- ---------------------------------------------------------------------------------------------------------------------------
Balance, December 31, 1996         38,769,514         387,695      90,172,863     82,318,341           0       172,878,899


Stock options exercised:
  Various prices per share            611,750           6,118         409,752                                      415,870
Purchase of treasury stock:
  100,000 shares                                                                               (2,200,000)      (2,200,000)
Income tax benefirt from exercise
  of non-qualified stock options                                                     733,034                       733,034
Net income                                                                        40,209,272                    40,209,272
- ---------------------------------------------------------------------------------------------------------------------------
Balance, December 31, 1997          39,381,264        393,813      90,582,615    123,260,647   (2,200,000)     212,037,075

Stock options exercised:
  Various prices per share              42,215            422          57,836                                       58,258
Purchase of treasury stock:
  1,000,081 shares                                                                            (21,016,047)     (21,016,047)
Net income                                                                        40,309,650                    40,309,650
- --------------------------------------------------------------------------------------------------------------------------
Balance, December 31, 1998          39,423,479       $394,235     $90,640,451   $163,570,297  ($23,216,047)   $231,388,936

</TABLE>
The accompanying notes are an integral part of these financial statements.
<PAGE>


<TABLE>
<CAPTION>

STATEMENTS OF CASH FLOWS
for the years ended December 31, 1998, 1997 and 1996


                                                    1998            1997           1996
<S>                                           <C>              <C>              <C>    

Cash flows from operating activities:
     Net income                               $40,309,650       $40,209,272     $39,819,904
     Adjustments to reconcile net
       income to net cash provided by
       operating activities:
     Depreciation                               9,002,669         7,342,518       4,890,303
     Provision for warranty claims              1,506,432         1,435,259       2,110,614
     Gain (loss) on sale of property,
       plant, and equipment                                          (9,884)         40,572
     Gain (loss) on sale of short-
       term investments classified
          as available-for-sale                    24,367            (6,063)        405,789
     Deferred income taxes                      1,188,956          (313,867)        104,561

     Change in operating assets:
          Accounts receivable                  (5,681,432)       (7,081,327)     (4,590,757)
          Inventory                           (26,331,473)        1,423,543       4,204,549
          Other assets                           (579,689)          932,165      (1,083,019)
     Change in operating liabilities:
          Accounts payable                      1,858,827          (228,996)       (390,321)
          Other liabilities                    (4,555,110)        1,284,106         (50,491)
                                          -------------------------------------------------
  Net cash provided by operating activities    16,743,197        44,986,726      45,461,704
                                          -------------------------------------------------
Cash flows from investing activities:
     Expenditures for property,
        plant and equipment                   (23,095,854)      (18,220,850)    (29,661,438)
     Proceeds from the disposition of
      property, plant, and equipment                                 58,297           4,602
          and equipment
     Purchase of long-term investments         (5,035,000)      (50,000,000)
     Purchase of short-term investments
      classified as available-for-sale         (2,986,195)       (5,271,247)     (8,309,030)
                                          --------------------------------------------------
 Net cash used in investing activities        (31,117,049)      (73,433,800)    (37,965,866)
                                          --------------------------------------------------

Cash flows from financing activities:
     Redemption of bonds payable                                (20,000,000)
     Proceeds from bond issuance                                 50,000,000
     Proceeds from issuance of common stock        58,258           415,870         781,758
     Income tax benefit from exercise
      of non-qualified stock options                                733,034       1,533,926
     Purchase of treasury stock               (21,016,047)       (2,200,000)
                                          -------------------------------------------------
 Net cash (used in)provided by
    financing activities                      (20,957,789)       28,948,904       2,315,684
                                          -------------------------------------------------
  Net(decrease)increase in cash and
    cash equivalents                          (35,331,641)          501,830       9,811,522
Cash and cash equivalents,
    beginning of year                          45,340,961        44,839,131      35,027,609
                                          -------------------------------------------------
Cash and cash equivalents, end of year        $10,009,320       $45,340,961     $44,839,131
                                          -------------------------------------------------

Supplemental disclosure of cash
    flow information:
     Cash paid during the year for interest,
       net of capitalized interest of
       $35,172,  $204,153 and $393,096 in
       1998, 1997and 1996, respectively        $2,276,495        $1,844,741        $909,368

     Cash paid during the year for            $23,964,517       $20,042,644     $22,151,925
       income taxes                         ----------------------------------------------
</TABLE>

The accompanying notes are an integral part of these financial statements.
<PAGE>

NOTES TO FINANCIAL STATEMENTS

Note 1  -   Summary of Significant Accounting Policies

     ADTRAN, Inc. (the "Company") designs, develops, manufactures,  markets, and
services a broad range of high-speed digital  transmission  products utilized by
telephone  companies  ("Telcos") and corporate  end-users to implement  advanced
digital  data  services  over  existing  telephone  networks.  The Company  also
customizes many of its products for private label  distribution and for original
equipment  manufacturers  to  incorporate  into their own products.  Most of the
Company's Telco and customer premises  equipment (CPE) products are connected to
the local loop,  which is the large  existing  infrastructure  of the  telephone
network,  predominantly  consisting of copper wireline, which connects end-users
to a Telco's  Central  Office.  The Central  Office is the Telco  facility  that
provides  local  switching  and  distribution  functions.  The  balance  of  the
Company's products are used in the Telcos' Central Offices.

Cash and Cash Equivalents:
     Cash and cash equivalents represent demand deposits, money market accounts,
and  short-term  investments  classified as  held-to-maturity  (see Note 2) with
original maturities of three months or less.

Financial Instruments:
     The  carrying  amount  reported  in the  balance  sheets  for cash and cash
equivalents,  accounts receivable,  and accounts payable approximates fair value
because of the immediate or short-term maturity of these financial  instruments.
The carrying  amount  reported  for the bonds  payable  approximates  fair value
because  the  underlying   instruments  are  at  variable  rates  that  re-price
frequently.

     Short-term investments represent re-marketed preferred stocks and municipal
bonds classified as available-for-sale securities. Re- marketed preferred stocks
are  designed to be marketed as money  market  instruments.  These  instruments'
interest  rates  reset  on a  short-term  basis  to  maintain  the  price of the
instruments at par. These  instruments  may be redeemed on the date the interest
rate resets.  The fair value of  short-term  investments  is estimated  based on
quoted market prices (see Note 2).  Realized  gains or losses are computed under
the specific identification method.

Inventory:
     Inventory  is  carried  at the lower of cost or  market,  with  cost  being
determined using the first-in, first-out method.

Property, Plant, and Equipment:
     Property,  plant,  and  equipment,  which is stated at cost, is depreciated
using methods which  approximate  straight-line  depreciation over the estimated
useful lives of the assets. Expenditures for repairs and maintenance are charged
to expense as incurred;  betterments  which materially  prolong the lives of the
assets are capitalized.  The cost of assets retired or otherwise disposed of and
the related accumulated  depreciation are removed from the accounts and the gain
or loss on such disposition is included in income.

Long-Lived Assets:
     The  Company  recognizes  impairment  losses on  long-lived  assets used in
operations when indicators of impairment are present and the  undiscounted  cash
flows  estimated  to be  generated  by those  assets  are less than the  assets'
carrying  values.  There were no such losses  recognized  during 1998, 1997, and
1996.

Research and Development Costs:
     Research and development costs are expensed as incurred.

Use of Estimates:
     The  preparation  of financial  statements  in  conformity  with  generally
accepted  accounting  principles  requires  management  to  make  estimates  and
assumptions  that  affect the  reported  amounts of assets and  liabilities  and
disclosure of  contingent  assets and  liabilities  at the date of the financial
statements and the reported amounts of revenue and expenses during the reporting
period. Actual results could differ from those estimates.

Income Taxes:
     The Company  utilizes  the asset and  liability  method of  accounting  for
income taxes which requires the  establishment  of deferred tax  liabilities and
assets, as measured by enacted tax rates, for all temporary  differences  caused
when the tax bases of assets and  liabilities  differ from those reported in the
financial statements.

Earnings Per Share:
     Earnings per common share and earnings per common share - assuming dilution
are based on the weighted  average number of common and, when  dilutive,  common
equivalent shares outstanding during the year (see Note 13).

Recently Issued Accounting Standards:
     In 1998, the Company adopted  Statement of Financial  Accounting  Standards
(SFAS)  No.  131,  Disclosures  about  Segments  of an  Enterprise  and  Related
Information,  that requires the use of the  management  approach in  identifying
operating  segments of the Company.  Under the  management  approach,  operating
segments of an enterprise  are  identified in a manner  consistent  with how the
Company makes operating  decisions and assesses  performance.  SFAS No. 131 also
requires  disclosures  about products and services,  geographic areas, and major
customers.  The adoption of SFAS No. 131 did not affect results of operations or
financial  position but did affect the  disclosure of segment  information  (see
Note 11).

     In June 1997,  the  Financial  Accounting  Standards  Board  (FASB)  issued
Statement   of  Financial   Accounting   Standards   SFAS  No.  130,   Reporting
Comprehensive  Income, which requires the reporting and display of comprehensive
income and its  components  in an  entity's  financial  statements.  The Company
adopted SFAS 130 during 1998 and, for the three years ending  December 31, 1998,
1997 and 1996,  there were no differences  between net income and  comprehensive
income.

     In June 1998,  the FASB  issued  SFAS No. 133,  Accounting  for  Derivative
Instruments and Hedging Activities.  SFAS No. 133 requires all derivatives to be
measured at fair value and  recognized  as either assets or  liabilities  on the
balance  sheet.  Changes  in such  fair  value  are  required  to be  recognized
immediately in net income (loss) to the extent the derivatives are not effective
as hedges.  SFAS No. 133 is effective for fiscal years  beginning after June 15,
1999 and is effective for interim  periods in the initial year of adoption.  The
Company does not currently hold any derivative financial instruments.



Note 2  -   Investments

     At December 31, 1998 and 1997, the Company held the following securities as
available-for-sale   or  held-to-maturity   recorded  at  amortized  cost  which
approximates fair value:

   1998
   Short-term investments, available-for-sale:
             Municipal bonds:                                      $34,553,013

             Re-marketed preferred stocks:
               GE Capital preferred asset corporation A series A     5,000,000
             Other:
               Commercial paper, US  Government securities and
               preferred stock                                       1,242,055
                                                                   -----------
   Total short-term investments 1998                               $40,795,068


   Long-term investments:
             Restricted money market funds (see Note 6)            $50,000,000
             Other equity investments                                5,035,000
                                                                  ------------
   Total long-term investments 1998                                $55,035,000



   1997
   Short-term investments, available-for-sale:

             Municipal bonds                                      $10,333,240

             Re-marketed preferred stocks:
              GE Capital preferred asset corporation A series A     5,000,000
              Muniyield Fund Auction market preferred series A      5,000,000
              VKM Investment Grade Municipal Trust preferred        5,000,000
              Nuveen Premium Income Fund preferred series M         2,500,000
              Duff & Phelps RP series C                             5,000,000
              Van Kampen Merritt Municipal Income                   5,000,000
                                                                  -----------
             Total short-term investments 1997                    $37,833,240


   Long-term investments:

              Restricted money market funds (see Note 6)          $50,000,000
                                                                   ----------
   Total long-term investments 1997                               $50,000,000
 <PAGE>

Note 3  -   Inventory

     At December 31, 1998 and 1997 inventory consisted of the following:

                                              1998              1997
 Raw materials                             $39,787,631      $24,199,720
 Work in process                             7,935,771        2,565,179
 Finished goods                             17,977,174       12,604,204
                                           ----------------------------
                                           $65,700,576      $39,369,103



Note 4  -   Property, Plant, and Equipment

     Property,  plant, and equipment was comprised of the following at December
31, 1998 and 1997:
<TABLE>

                                           1998                   1997
<S>                                    <C>                <C>   
Land                                   $  4,263,104         $ 4,263,104
Building                                 28,684,088          28,673,642
Construction in progress                 12,119,342           3,081,702
Land improvements                         9,499,352           7,963,770
Office machinery and equipment           22,683,087          17,184,334
Engineering machinery and equipment      31,548,285          24,534,852
                                        --------------------------------
                                        108,797,258          85,701,404

Less accumulated depreciation           (29,902,941)        (20,900,272)
                                       ---------------------------------
                                        $78,894,317         $64,801,132
</TABLE>




Note 5  -  Line of Credit

     The  Company  has a  $10,000,000  line of  credit  at a bank,  which  bears
interest  at the rate of 87.5 basis  points  over the 30 day  London  inter-bank
offered  rate.  At  December  31, 1998 and 1997,  the Company had no  borrowings
outstanding under this line. The line of credit expires on May 1, 1999.


Note 6  -  Alabama State Industrial Development Authority Financing

     In conjunction with an expansion of its Huntsville,  Alabama facility,  the
Company was approved for  participation  in an incentive  program offered by the
State of Alabama Industrial Development Authority (the "Authority"). Pursuant to
such program,  on January 13, 1995,  the  Authority  issued  $20,000,000  of its
taxable  revenue bonds pursuant to such program and loaned the proceeds from the
sale of the bonds to the Company. The bonds were originally purchased by AmSouth
Bank of Alabama, Birmingham,  Alabama (the "Bank"). First Union National Bank of
Tennessee,  Nashville,  Tennessee (the "Bondholder") purchased the original bond
from the Bank and made  further  advances to the  Authority  bringing  the total
amount outstanding to $50,000,000.  An Amended and Restated Taxable Revenue Bond
(ADTRAN,  Inc.  Project),  Series 1995,  was issued and the  original  financing
agreement  was amended.  The Amended and Restated Bond bears  interest,  payable
monthly,  at the  rate of 45 basis  points  over the  money  market  rate of the
Bondholder  and will mature on January 1, 2020.  The Company is required to make
payments to the  Authority  in amounts  necessary  to pay the  principal  of and
interest on the Amended and Restated Bond. Included in long-term investments are
$50,000,000  which is  restricted  for payment of the  principal  amount of this
bond.  Construction  on the project began in March 1995 and certain  phases were
completed by December 31, 1998.
<PAGE>


Note 7  -   Income Taxes
<TABLE>

     A summary of the components of the provision  (benefit) for income taxes as
of December 31 is as follows:
                                         1998           1997            1996
     <S>                              <C>            <C>            <C>
    Current:
    Federal                            $17,551,986   $21,251,520    $21,329,522
    State                                1,564,664     1,679,903      2,247,809
                                       ----------------------------------------
    Total Current                       19,116,650    22,931,423     23,577,331
    Deferred tax provision (benefit)     1,188,956      (313,867)       104,561
                                       ----------------------------------------
    Total provision for income taxes   $20,305,606   $22,617,556    $23,681,892
</TABLE>

     The  provision  for income  taxes  differs  from the  amounts  computed  by
applying the federal statutory rate due to the following:

 <TABLE>
                                                                   1998           1997           1996
   <S>                                                        <C>             <C>           <C>
   Tax provision computed at the federal statutory rate
     (35% in 1998, 1997 and 1996)                              $21,215,340     $21,989,390   $22,225,629
   State income tax provision, net of federal benefit            1,017,032       1,091,936     1,461,076
   Federal research credits                                     (1,650,877)     (1,248,925)     (151,500)
   Permanent differences and other                                (275,889)        785,155       146,687
                                                              -------------------------------------------
                                                               $20,305,606     $22,617,556   $23,681,892
</TABLE>

     Temporary  differences  which create deferred tax assets and liabilities at
December 31, 1998 and 1997 are detailed below.
<TABLE>
                                                     1998                        1997
                                               Current    Non-          Current         Non-
                                                        current                         current
  <S>                                    <C>           <C>             <C>           <C>

   Property, plant and equipment                     ($3,295,140)                    ($2,147,635)
   Accounts receivable                   $422,758                      $ 381,022
   Inventory                              844,519                      1,130,083
   Accruals                             1,149,408                        947,031
                                        ---------------------------------------------------------
   Deferred tax asset
   (liability)                         $2,416,685    ($3,295,140)     $2,458,136     ($2,147,635)
</TABLE>

     No valuation allowance is deemed necessary by management as the realization
of recorded deferred tax assets is considered more likely than not.

<PAGE>


Note 8  -  Operating Leases

     The Company leases office space and equipment under operating leases. As of
December 31, 1998,  future  minimum rental  payments under the non-  cancellable
operating leases are approximately as follows:

         1999                                 $ 962,000
         2000                                   525,000
         2001                                   228,000
         2002                                   215,000
         2003                                   108,000
                                             ----------
                                              $2,038,000


     Rental expense was approximately $908,000,  $657,000 and $851,000, in 1998,
1997 and 1996, respectively.


Note 9  -   Employee Incentive Stock Option Plan and Directors' Stock
Option Plan

     The Board of Directors of the Company adopted the 1996 Employees  Incentive
Stock Option Plan (the "1996  Plan")  effective  February 14, 1996,  under which
2,488,100 shares of common stock were reserved for issuance to certain employees
and officers through incentive stock options and non-qualified stock options. In
addition,  the Company currently has options outstanding under its 1986 Employee
Incentive  Stock Option Plan (the "1986  Plan"),  which plan expired on February
14,  1996.  Options  granted  under  the  1996  Plan  or the  1986  Plan  become
exercisable  after one year of continued  employment  after the date of grant or
pursuant to a five year vesting schedule  beginning on the first  anniversary of
the grant date.  Expiration dates of options outstanding under the 1996 Plan and
the 1986 Plan at December 31, 1998 range from 1999 to 2008.

     The Board of  Directors of the Company  adopted a  Directors'  Stock Option
Plan  effective  October 31, 1995 under which 70,000 shares of common stock have
been  reserved.  The Plan is a formula plan to provide  options to  non-employee
directors of the Company.  At December 31, 1998, 42,000 options had been granted
under the plan.  Expiration  dates of options  outstanding  under the Director's
Stock Option Plan at December 31, 1998 range from 2005 to 2008.

Pertinent information regarding the Plans is as follows:
<TABLE>

                                                                        Weighted
                                               Number      Range of      Average
                                                of         Exercise     Exercise        Vesting
                                               Options      Prices        Price        Provisions
<S>                                         <C>         <C>              <C>          <C>    

Options outstanding,December 31, 1995       2,170,395     $.06 -$46.25     $1.83       100% /year
Options granted                               342,000   $39.75 -$65.75    $63.99        20% /year
Options granted                                 7,950   $30.50 -$65.75    $44.43       100% /year
Options cancelled                              (9,050)   $3.33 -$65.75    $61.78          various
Options exercised                          (1,307,239)    $.06 -$31.75     $0.60       100% /year
                                           ------------------------------------------------------

Options outstanding, December 31, 1996      1,204,056     $.11 -$65.75    $20.38          various              
Options granted                               697,750   $22.00 -$42.38    $25.62          various                            
Options granted                                 3,000   $42.72 -$42.72    $42.72          various                                 
Options granted                                21,700   $25.37 -$45.78    $32.26          various                                 
Options cancelled                             (38,300)  $22.00 -$65.75    $50.89          various 
Options exercised                            (611,750)    $.11 -$31.75      $.68          various
                                           ------------------------------------------------------

Options outstanding, December 31, 1997      1,276,456     $.17 -$65.75    $32.24          various              
Options granted                             1,018,225   $18.31 -$26.25    $21.46          various                                
Options granted                                10,250   $30.50 -$31.00    $30.69          various                                   
Options cancelled                             (45,370)  $21.31 -$65.75    $35.61          various                                  
Options exercised                             (42,215)    $.17 - $3.33     $1.38          various
                                          -------------------------------------------------------

Options outstanding,December 31, 1998       2,217,346     $.50 -$65.75    $27.78          various
</TABLE>


     The following table summarizes  information about stock options outstanding
at December 31, 1998:
               

 <TABLE>
                                        Weighted 
                                         Average              Weighted                         Weighted
Range of            Number              Remaining              Average          Number          Average
Exercise          Outstanding          Contractual            Exercise        Exercisable       Exercise
Prices             12/31/98               Life                  Price          12/31/98         Price
<S>                <C>                   <C>                 <C>               <C>             <C>   
               
  $.50 - $3.33      137,541               3.47                 $2.24            137,541          $2.24
$12.53 -$21.31      959,625               9.17                $21.22              8,000         $12.53
$22.00 -$28.50      723,580               8.57                $25.29            141,724         $25.47
$30.38 -$46.25      115,100               7.83                $36.81             80,290         $36.64
$56.25 -$65.75      281,500               7.57                $65.34            116,800         $65.11
- ---------------------------------------------------------------------------------------------------------
                  2,217,346                                                     484,355
</TABLE>


     The options  above were issued at exercise  prices which  approximate  fair
market value at the date of grant.  At December 31, 1998,  528,695  options were
available  for grant  under the plans.  The  Company  applies APB Opinion 25 and
related  Interpretations  in  accounting  for its stock plans.  Accordingly,  no
compensation cost has been recognized related to stock options. Had compensation
cost for the Company's  stock-based  compensation plans been determined based on
the fair value at the grant dates for awards under those plans  consistent  with
the method prescribed in SFAS No. 123, the Company's net income and earnings per
share would have been reduced to the pro forma amounts indicated below:


<TABLE>
                                                                             
                                         1998          1997            1996
  <S>                               <C>             <C>            <C> 
  Net income - as reported           $40,309,650     $40,209,272    $39,819,904   
  Net income - pro forma              35,417,764      37,634,225     38,018,766 
  Earnings per share - as reported
   assuming dilution                       $1.03           $1.02          $1.01
  Earnings per share - pro forma
   assuming dilution                        $.90            $.96           $.96

</TABLE>

     The pro forma amounts reflected above are not representative of the effects
on reported net income in future years because, in general,  the options granted
typically  do not vest for  several  years and  additional  awards are made each
year.  The fair value of each option  grant is estimated on the grant date using
the  Black-Scholes  option-  pricing model with the  following  weighted-average
assumptions:
 <TABLE>
                                            
                                     1998             1997              1996
  <S>                              <C>             <C>               <C>    
  Dividend yield                      0%               0%                0%
  Expected life (years)               5                5                 5
  Expected volatility               59.1%            49.1%             48.7%
  Risk-free interest rate           4.67%            6.06%             7.09%

</TABLE>



Note 10  -   Employee Benefit Plan

     In March 1990, the Company adopted an incentive  savings plan (the "Savings
Plan") for all of its employees.  The Savings Plan provides  certain  employment
benefits to all eligible employees and qualifies as a deferred arrangement under
Section  401(k) of the Internal  Revenue Code of 1986,  as amended.  The Company
matches  one-half  of  a  participant's   contribution,   limited  to  5%  of  a
participant's  income.  An employee's  interest in the  Company's  contributions
becomes 100% vested at the date  participation  in the Savings  Plan  commenced.
Charges to operations for the plan amounted to approximately $928,000, $717,000,
$547,000, in 1998, 1997 and 1996, respectively.


Note 11  -   Segment Information and  Major Customers

     The Company  operates two reportable  segments - (1) Telco and (2) CPE. The
accounting  policies  of the  segments  are the same as those  described  in the
"Summary of  Significant  Accounting  Policies"  (see Note 1) to the extent that
such policies affect the reported segment information. The Company evaluates the
performance of its segments based on gross profit;  therefore,  selling, general
and  administrative  costs,  as  well  as  research  and  development,  interest
income/expense,  and  provision  for taxes,  is reported on an entity wide basis
only. There are no intersegment revenues.

     The table below  presents  information  about the reported  sales and gross
profit  of the  Company  for each of the years in the three  year  period  ended
December 31, 1998.  Asset  information  by  reportable  segment is not reported,
since the Company does not produce such information internally.
<TABLE>

                          1998                     1997                     1996
                    Sales     Gross          Sales     Gross           Sales      Gross
                              Profit                   Profit                     Profit
(in thousands)
<S>              <C>         <C>           <C>        <C>             <C>       <C>     
Telco            $167,500    $91,574       $171,838   $ 84,568        $171,902  $ 82,624
CPE               119,059     64,975         93,497     50,513          78,219    37,544
                 -----------------------------------------------------------------------
Total            $286,559   $156,549       $265,335   $135,081        $250,121  $120,168

</TABLE>


     The following is sales  information by geographic  area for the years ended
December 31:

Sales (in thousands)
                             1998          1997          1996
United States             $277,062      $242,230      $231,703
Foreign                      9,497        23,105        18,418
                         -------------------------------------
                          $286,559      $265,335      $250,121


     Sales of the Company's transmission and test equipment to the Regional Bell
Operating  Companies (RBOCs) amounted to approximately 29%, 33% and 36% of total
sales during the years ended December 31, 1998, 1997 and 1996, respectively.  At
December 31, 1998, 1997 and 1996 respectively,  21%, 26% and 23% of the accounts
receivable balance consisted of amounts due from RBOCs.


Note 12  -   Contingencies

     The Company has certain  contingent  liabilities  resulting from litigation
arising in the normal course of business. Although the outcome of any litigation
can never be  certain,  it is the  Company's  opinion  that the  outcome of such
contingencies  will not materially  affect its business,  operations,  financial
condition or cash flows.

<PAGE>


Note 13  -   Earnings Per Share

     A summary of the  calculation  of basic and diluted  earnings per share for
the years ended December 31, 1998, 1997 and 1996 is as follows:
<TABLE>
<CAPTION>
                                  
                                                   FOR THE YEAR ENDED 1998
                                              Income          Shares         Per-Share
                                             (Numerator)   (Denominator)        Amount
<S>                                          <C>             <C>                 <C>                                   
BASIC EPS
Income available to common          
  stockholders                                $40,309,650     38,981,558        $1.03  
    
EFFECT OF DILUTIVE SECURITIES
Stock Options                                           0        182,205

DILUTED EPS
Income available to common
 stockholders + assumed conversions           $40,309,650     39,163,763        $1.03




                                                   FOR THE YEAR ENDED 1997
                                                Income        Shares         Per-Share
                                               (Numerator)  (Denominator)       Amount
BASIC EPS
Income available to common          
  stockholders                                $40,209,272     39,201,871        $1.03  

EFFECT OF DILUTIVE SECURITIES
Stock Options                                           0         363,626
 
DILUTED EPS
Income available to common
 stockholders + assumed conversions            40,209,272      39,565,497        $1.02
                


                                                    FOR THE YEAR ENDED 1996
                                                Income         Shares        Per-Share
                                               (Numerator)   (Denominator)      Amount
                                  
BASIC EPS
Income available to common          
 stockholders                                 $39,819,904       38,603,289        $1.03  

EFFECT OF DILUTIVE SECURITIES
Stock Options                                           0         945,365

DILUTED EPS
Income available to common
 stockholders + assumed conversions           $39,819,904      39,548,654         $1.01
  
</TABLE>



     The following options were outstanding during the respective year, but were
not included in the  computation of that year's diluted EPS because the options'
exercise price was greater than the average market price of the common shares in
the respective year.
<TABLE>
<CAPTION>

             1998                                    1997                               1996
Options    Exercise                       Options   Exercise                 Options  Exercise
Granted     Price        Expiration      Granted     Price    Expiration     Granted   Price   Expiration
<S>      <C>                <C>        <C>        <C>           <C>       <C>      <C>            <C>

 58,450  $31.75-$46.25      2005          3,500     $46.25       2005       6,000     $46.25      2005        
284,450  $56.25-$65.75      2006        294,400  $56.25-$65.75   2006       8,500  $56.25-$59.50  2005  
 20,450  $39.63-$46.25      2006         17,700  $37.63-$42.38   2007     309,000  $63.75-$65.75  2005
  2,500  $30.50-$30.75      2006       
 23,700  $35.63-$42.72      2007
  8,200  $27.50-$28.50      2007
 28,500  $26.25-$30.38      2008
      
</TABLE>



Note 14  -   Summarized Quarterly Financial Data (Unaudited)

     The following table presents unaudited quarterly operating results for each
of the Company's last eight fiscal quarters.  This information has been prepared
by the  Company  on a basis  consistent  with the  Company's  audited  financial
statements and includes all  adjustments,  consisting  only of normal  recurring
adjustments, that the Company considers necessary for a fair presentation of the
data.
<TABLE>

                                                                 
(In thousands,except for per share amounts)                      THREE MONTHS ENDED
                                                    March 31,   June 30,  September 30,  December 31,
                                                      1998        1998       1998            1998
<S>                                               <C>          <C>         <C>            <C>    

Net sales                                          $65,327      $71,155     $77,044        $73,033                                 
Gross profit                                        35,919       38,950      42,310         39,370                                  
Income from operations                              14,283       14,441      16,377         12,165                                  
Net income                                           9,893       10,145      11,441          8,831
Earnings per common share - assuming dilution         $.25         $.26        $.29           $.23 
Earnings per common share - basic                     $.25         $.26        $.29           $.23



                                                                 THREE MONTHS ENDED
(In thousands,except for per share amounts)       March 31,    June 30,  September 30,   December 31,
                                                    1997         1997        1997             1997

Net sales                                          $61,231     $59,125      $70,579        $74,400                               
Gross profit                                        31,791      28,632       36,092         38,566                              
Income from operations                              14,258      10,291       16,778         18,726                                
Net income                                           9,522       6,980       11,141         12,566
Earnings per common share - assuming dilution         $.24        $.18         $.28           $.32
Earnings per common share - basic                     $.25        $.18         $.28           $.32
</TABLE>

<PAGE>



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

     No  independent  certified  public  accountant of the Company has resigned,
indicated any intent to resign or been  dismissed as the  independent  certified
public  accountant of the Company  during the three fiscal years ended  December
31, 1998 or subsequent thereto.


                              PART III


 ITEM 10.   DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

     Information  relating to nominees  for director of the Company is set forth
under the caption  "Election  of  Directors-Information  Regarding  Nominees for
Director" in the Proxy  Statement for the Annual Meeting of  Stockholders  to be
held on April 20, 1999. Such  information is  incorporated  herein by reference.
The  definitive  Proxy  Statement will be filed with the Securities and Exchange
Commission  within 120 days after the  Company's  fiscal  year end.  Information
relating to the executive officers of the Company,  pursuant to Instruction 3 of
Item 401(b) of Regulation S-K and General Instruction G(3) of Form 10- K, is set
forth at Part I, Item 4(A) of this report under the caption "Executive  Officers
of the Registrant." Such information is incorporated herein by reference.


ITEM 11.  EXECUTIVE COMPENSATION

     Information  relating  to  executive  compensation  is set forth  under the
caption  "Executive  Compensation" in the Proxy Statement referred to in Item 10
above. Such information is incorporated herein by reference.



ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND
MANAGEMENT

     Information relating to ownership of Common Stock of the Company by certain
persons  is  set  forth  under  the  caption   "Share   Ownership  of  Principal
Stockholders  and  Management"  in the Proxy  Statement  referred  to in Item 10
above. Such information is incorporated herein by reference.


ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

     Information relating to existing or proposed  relationships or transactions
between  the  Company  and any  affiliate  of the Company is set forth under the
caption  "Compensation  Committee  Interlocks and Insider  Participation" in the
Proxy Statement  referred to in Item 10 above.  Such information is incorporated
herein by reference.

<PAGE>
                               PART IV


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

     (a)  Documents Filed as Part of This Report.

          1. Financial Statements

             The  financial  statements of the Company and the related  report
             of independent auditors thereon are set forth under Part II, Item 8
             of this report.

             Balance Sheets as of December 31, 1998 and 1997

             Statements of Income for the years ended December  31, 1998, 1997
             and 1996
 
             Statements of Changes in Stockholders' Equity for the years ended
             December 31, 1998, 1997 and 1996.

             Statements of Cash Flows for the years ended December 31, 1998, 
             1997 and 1996.

             Notes to Financial Statements


         2.  Financial Statement Schedules

             Schedule II - Valuation and  Qualifying Accounts

         3.  Exhibits

     The following  exhibits are filed with or incorporated by reference in this
report.  Where such filing is made by incorporation by reference to a previously
filed registration statement or report, such registration statement or report is
identified in parentheses. The Company will furnish any exhibit upon request to:
ADTRAN,  Inc.,  Attn:  Investor  Relations,  P.  O.  Box  140000,  901  Explorer
Boulevard,  Huntsville,  Alabama  35814.  There is a charge  of $.50 per page to
cover expenses for copying and mailing.




Exhibit
Number                       Description

3.1  Certificate of Incorporation, as amended (Exhibit 3.1 to the Company's
     Registration Statement on Form S-1, No.33-81062 (the "Form S-1 Registration
     Statement")).

3.2  Bylaws, as amended (Exhibit 3.2 to the Form S-1 Registration Statement).

10.1 Documents relative to the $50,000,000 Taxable Revenue Bond, Series  1995 
     (ADTRAN,Inc. Project)issued by the Alabama State Industrial Development
     Authority,consisting of the following (Exhibit 10.3 to the Company's Annual
     Report on Form 10-K for the year ended  December 31, 1994 (the "1994 Form
     10-K")):

     (a)  Financing  Agreement dated January 1, 1995, among the State Industrial
          Development  Authority,  a public corporation organized under the laws
          of the State of Alabama (the  "Issuer"),  the Company and AmSouth Bank
          of Alabama, a state banking corporation under the laws of the State of
          Alabama;

     (b)  Loan Agreement dated January 1, 1995 (the "Loan  Agreement"),  between
          the Issuer and the Company;

     (c)  Resolution of the Issuer  authorizing  the issuance of the $50,000,000
          Taxable Revenue Bond, Series 1995 (ADTRAN, Inc. Project);

     (d)  Specimen Taxable Revenue Bond, Series 1995 (ADTRAN, Inc. Project);

     (e)  Resolution of the Company  authorizing  the Financing  Agreement,  the
          Loan Agreement and the Note;

     (f)  Specimen  Note from the  Company to  AmSouth  Bank of  Alabama,  dated
          January 13, 1995;

     (g)  Pledge  Agreement  dated  January 13,  1995  between  AmSouth  Bank of
          Alabama and the Company;

     (h)  Eighth Amended and Restated Closing  Agreement between the Company and
          AmSouth Bank of Alabama dated March 24, 1997 and effective January 13,
          1995; and

     (i)  Preliminary  Agreement  dated November 16, 1994 between the Issuer and
          the Company.

10.2 Master Note for Business and Commercial Loans, dated June 1, 1996 and in
     the original principal amount of $10,000,000 by and between the Company and
     AmSouth Bank of Alabama.

10.3 Tax  Indemnification Agreement dated July 1, 1994 by and among the Company
     and the stockholders of the Company prior to the Company's initial public 
     offering of Common Stock (Exhibit 10.5 to the 1994 Form 10-K).

10.4 Management Contracts and Compensation Plans:

     (a)  1996 Employees  Stock Incentive Plan (Exhibit 10.4 to 1995 Form 10-K).

     (b)  1995  Directors  Stock  Incentive  Plan (Exhibit 10.4 to 1995 Form
          10-K).

*23  Consent of  PricewaterhouseCoopers LLP

*24  Powers of Attorney

*27  Financial Data Schedule


(b)  Reports on Form 8-K.     None




*Filed herewith
<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 on March 30, 1999.
                              
                                ADTRAN, Inc.
                                (Registrant)


                              By: /s/ John R. Cooper
                                   JOHN R. COOPER
                                   Vice President - Finance and 
                                   Chief Financial Officer

     Pursuant to the  requirements of the Securities  Exchange Act of 1934, this
report  has  been  signed  below  by the  following  persons  on  behalf  of the
Registrant and in the capacities indicated on March 30, 1999.

     Signature                     Title

/s/ Mark C.Smith                   Chairman of the Board, Chief
Mark C. Smith                      Executive Officer and Director

Howard A Thrailkill*               President, Chief Operating Officer
Howard A.Thrailkill                and Director

Lonnie S. McMillian*               Sr. Vice President, Secretary,
Lonnie S. McMillian                and Director

William L. Marks*                  Director
William L. Marks

Roy J. Nichols*                    Director
Roy J. Nichols

James L. North*                    Director
James L. North

/s/ John R. Cooper                 Vice President-Finance and
John R. Cooper                     Chief Financial Officer

*By: /s/Mark C. Smith
       Mark C Smith
       as Attorney in Fact


<PAGE>
                           Report of Independent Accountants


To the Board of Directors
ADTRAN, Inc.

     Our audits of the financial  statements of ADTRAN,  Inc. referred to in our
report  dated  January  14,  1999  appearing  on page 24 of this  Form 10-K also
included an audit of the financial  statement schedule listed in Item 14 of this
Form 10-K. In our opinion, this financial statement schedule presents fairly, in
all  material  respects,   the  information  set  forth  therein  when  read  in
conjunction with the related financial statements.


/s/ PricewaterhouseCoopers LLP
Birmingham, Alabama
January 14, 1999
                
<PAGE>

<TABLE>
                                              SCHEDULE II
                                    VALUATION AND QUALIFYING ACCOUNTS

                                          Balance at                                       Balance
                                          Beginning of                                    at end of
                                            Period       Additions        Deductions        Period
<S>                                      <C>            <C>               <C>            <C>                             
Year ended December 31, 1998
        
Allowance for Doubtful Accounts            $893,389      $275,025           $209,609       $958,805
Inventory Reserve                        $2,249,063    $1,277,237         $2,377,569     $1,148,731
Warranty Liability                       $1,435,259    $1,600,824         $1,516,138     $1,519,945


Year ended December 31, 1997

Allowance for Doubtful Accounts            $872,724      $254,366           $233,701       $893,389
Inventory Reserve                          $883,032    $1,366,031                        $2,249,063                                 
Warranty Liability                       $1,026,156      $409,103                        $1,435,259                     


Year ended December 31, 1996

Allowance for Doubtful Accounts            $544,526      $430,789           $102,591      $ 872,724
Inventory Reserve                          $660,151      $222,881                         $ 883,032
Warranty Liability                         $523,027      $503,129                        $1,026,156
</TABLE>
<PAGE>


                              ADTRAN, INC.

                            INDEX OF EXHIBITS


Exhibit
Number                    Description

3.1  Certificate of Incorporation, as amended (Exhibit 3.1 to the Company's
     Registration  Statement  on Form  S-1,  No.  33-81062  (the  "Form S-1
     Registration Statement")).

3.2  Bylaws, as amended (Exhibit 3.2 to the Form S-1 Registration Statement).

10.1 Documents  relative to the $50,000,000  Taxable Revenue Bond, Series 1995 
     (ADTRAN,Inc. Project) issued by the Alabama State Industrial Development 
     Authority, consisting of the following (Exhibit 10.3 to the Company's 
     Annual Report on Form 10-K for the year ended  December 31, 1994 (the "1994
     Form 10-K")):

     (a)  Financing  Agreement dated January 1, 1995, among the State Industrial
          Development  Authority,  a public corporation organized under the laws
          of the State of Alabama (the  "Issuer"),  the Company and AmSouth Bank
          of Alabama, a state banking corporation under the laws of the State of
          Alabama;

     (b)  Loan Agreement dated January 1, 1995 (the "Loan  Agreement"),  between
          the Issuer and the Company;

     (c)  Resolution of the Issuer  authorizing  the issuance of the $50,000,000
          Taxable Revenue Bond, Series 1995 (ADTRAN, Inc. Project);

     (d)  Specimen Taxable Revenue Bond, Series 1995 (ADTRAN, Inc. Project);
              
     (e)  Resolution of the Company  authorizing  the Financing  Agreement,  the
          Loan Agreement and the Note;

     (f)  Specimen  Note from the  Company to  AmSouth  Bank of  Alabama,  dated
          January 13, 1995;

     (g)  Pledge  Agreement  dated  January 13,  1995  between  AmSouth  Bank of
          Alabama and the Company;

     (h)  Eighth Amended and Restated Closing  Agreement between the Company and
          AmSouth Bank of Alabama dated March 24, 1997 and effective January 13,
          1995; and

     (i)  Preliminary  Agreement  dated November 16, 1994 between the Issuer and
          the Company.

10.2 Master Note for Business and Commercial Loans, dated June 1, 1996 and in 
     the original principal amount of $10,000,000 by and between the Company and
     AmSouth Bank of Alabama.

10.3 Tax Indemnification Agreement dated July 1, 1994 by and among the Company 
     and the stockholders of the Company prior to the Company's initial public
     offering of Common Stock (Exhibit 10.5 to the 1994 Form 10-K).

10.4 Management Contracts and Compensation Plans:

     (a)  1996 Employees Stock Incentive Plan (Exhibit 10.4 to 1995 Form 10-K).

     (b)  1995 Directors Stock Incentive Plan (Exhibit 10.4 to 1995 Form 10-K).

*23   Consent of PricewaterhouseCoopers LLP

*24   Powers of Attorney

*27   Financial Data Schedule







*Filed herewith


                          CONSENT OF INDEPENDENT ACCOUNTANTS



     We consent to the incorporation by reference in the registration statements
of ADTRAN, Inc. on Forms S-8 (file No. 33-83982, 333-30375 and 333-29899) of our
reports dated  January 14, 1999, on our audits of the  financial  statements and
financial statement schedule of ADTRAN,  Inc. as of December 31, 1998 and 1997,
and for the years ended December 31, 1998, 1997, and 1996,  which reports are 
incorporated  by reference in the Annual Report on Form 10-K.


/s/PricewaterhouseCoopers LLP
Birmingham, Alabama
March 30, 1999



                                POWER OF ATTORNEY


     KNOW  ALL MEN BY  THESE  PRESENTS,  that the  undersigned  constitutes  and
appoints Mark C. Smith,  Howard A.  Thrailkill  and John R. Cooper,  and each of
them,  his true and  lawful  attorneys-in-fact  and  agents,  with full power of
substitution,  for  him  and in his  name,  place  and  stead,  in any  and  all
capacities,  to sign the  Annual  Report on Form 10-K of  ADTRAN,  Inc.  for the
fiscal year ended December 31, 1998, and any and all amendments thereto,  and to
file the same,  with all  exhibits  thereto and other  documents  in  connection
therewith,  with the  Securities  and Exchange  Commission,  granting  unto said
attorneys-in-fact  and agents,  and each of them, full power and authority to do
and perform each and every act and thing  requisite or necessary to be done,  as
fully to all  intents  and  purposes  as he might or could do in person,  hereby
ratifying and  confirming all that said  attorneys-in-fact  and agents or any of
them, or their or his substitute or substitutes,  may lawfully do or cause to be
done by virtue hereof.
         This 19th day of January, 1999.



                                          /s/ Lonnie S. McMillian            
                                              Lonnie S. McMillian
<PAGE>
                             

                              POWER OF ATTORNEY


     KNOW  ALL MEN BY  THESE  PRESENTS,  that the  undersigned  constitutes  and
appoints Mark C. Smith,  Howard A.  Thrailkill  and John R. Cooper,  and each of
them,  his true and  lawful  attorneys-in-fact  and  agents,  with full power of
substitution,  for  him  and in his  name,  place  and  stead,  in any  and  all
capacities,  to sign the  Annual  Report on Form 10-K of  ADTRAN,  Inc.  for the
fiscal year ended December 31, 1998, and any and all amendments thereto,  and to
file the same,  with all  exhibits  thereto and other  documents  in  connection
therewith,  with the  Securities  and Exchange  Commission,  granting  unto said
attorneys-in-fact  and agents,  and each of them, full power and authority to do
and perform each and every act and thing  requisite or necessary to be done,  as
fully to all  intents  and  purposes  as he might or could do in person,  hereby
ratifying and  confirming all that said  attorneys-in-fact  and agents or any of
them, or their or his substitute or substitutes,  may lawfully do or cause to be
done by virtue hereof.

         This 19th day of January, 1999.

                                                     /s/ Roy J. Nichols
                                                         Roy J. Nichols

<PAGE>

                               POWER OF ATTORNEY


     KNOW  ALL MEN BY  THESE  PRESENTS,  that the  undersigned  constitutes  and
appoints Mark C. Smith,  Howard A.  Thrailkill  and John R. Cooper,  and each of
them,  his true and  lawful  attorneys-in-fact  and  agents,  with full power of
substitution,  for  him  and in his  name,  place  and  stead,  in any  and  all
capacities,  to sign the  Annual  Report on Form 10-K of  ADTRAN,  Inc.  for the
fiscal year ended December 31, 1998, and any and all amendments thereto,  and to
file the same,  with all  exhibits  thereto and other  documents  in  connection
therewith,  with the  Securities  and Exchange  Commission,  granting  unto said
attorneys-in-fact  and agents,  and each of them, full power and authority to do
and perform each and every act and thing  requisite or necessary to be done,  as
fully to all  intents  and  purposes  as he might or could do in person,  hereby
ratifying and  confirming all that said  attorneys-in-fact  and agents or any of
them, or their or his substitute or substitutes,  may lawfully do or cause to be
done by virtue hereof.

         This 19th day of January, 1999.

                                                     /s/ William L. Marks
                                                         William L. Marks


<PAGE>

                                POWER OF ATTORNEY


     KNOW  ALL MEN BY  THESE  PRESENTS,  that the  undersigned  constitutes  and
appoints Mark C. Smith,  Howard A.  Thrailkill  and John R. Cooper,  and each of
them,  his true and  lawful  attorneys-in-fact  and  agents,  with full power of
substitution,  for  him  and in his  name,  place  and  stead,  in any  and  all
capacities,  to sign the  Annual  Report on Form 10-K of  ADTRAN,  Inc.  for the
fiscal year ended December 31, 1998, and any and all amendments thereto,  and to
file the same,  with all  exhibits  thereto and other  documents  in  connection
therewith,  with the  Securities  and Exchange  Commission,  granting  unto said
attorneys-in-fact  and agents,  and each of them, full power and authority to do
and perform each and every act and thing  requisite or necessary to be done,  as
fully to all  intents  and  purposes  as he might or could do in person,  hereby
ratifying and  confirming all that said  attorneys-in-fact  and agents or any of
them, or their or his substitute or substitutes,  may lawfully do or cause to be
done by virtue hereof.

         This 19th day of January, 1999.

                                                     /s/ Mark C. Smith
                                                         Mark C. Smith


<PAGE>

                              POWER OF ATTORNEY


     KNOW  ALL MEN BY  THESE  PRESENTS,  that the  undersigned  constitutes  and
appoints Mark C. Smith,  Howard A.  Thrailkill  and John R. Cooper,  and each of
them,  his true and  lawful  attorneys-in-fact  and  agents,  with full power of
substitution,  for  him  and in his  name,  place  and  stead,  in any  and  all
capacities,  to sign the  Annual  Report on Form 10-K of  ADTRAN,  Inc.  for the
fiscal year ended December 31, 1998, and any and all amendments thereto,  and to
file the same,  with all  exhibits  thereto and other  documents  in  connection
therewith,  with the  Securities  and Exchange  Commission,  granting  unto said
attorneys-in-fact  and agents,  and each of them, full power and authority to do
and perform each and every act and thing  requisite or necessary to be done,  as
fully to all  intents  and  purposes  as he might or could do in person,  hereby
ratifying and  confirming all that said  attorneys-in-fact  and agents or any of
them, or their or his substitute or substitutes,  may lawfully do or cause to be
done by virtue hereof.

         This 19th day of January, 1999.

                                                     /s/ Howard A. Thrailkill
                                                         Howard A. Thrailkill


<PAGE>


                                 POWER OF ATTORNEY


     KNOW  ALL MEN BY  THESE  PRESENTS,  that the  undersigned  constitutes  and
appoints Mark C. Smith,  Howard A.  Thrailkill  and John R. Cooper,  and each of
them,  his true and  lawful  attorneys-in-fact  and  agents,  with full power of
substitution,  for  him  and in his  name,  place  and  stead,  in any  and  all
capacities,  to sign the  Annual  Report on Form 10-K of  ADTRAN,  Inc.  for the
fiscal year ended December 31, 1998, and any and all amendments thereto,  and to
file the same,  with all  exhibits  thereto and other  documents  in  connection
therewith,  with the  Securities  and Exchange  Commission,  granting  unto said
attorneys-in-fact  and agents,  and each of them, full power and authority to do
and perform each and every act and thing  requisite or necessary to be done,  as
fully to all  intents  and  purposes  as he might or could do in person,  hereby
ratifying and  confirming all that said  attorneys-in-fact  and agents or any of
them, or their or his substitute or substitutes,  may lawfully do or cause to be
done by virtue hereof.

         This 19th day of January, 1999.

                                                     /s/ John R. Cooper
                                                         John R. Cooper


<PAGE>

                                      POWER OF ATTORNEY


     KNOW  ALL MEN BY  THESE  PRESENTS,  that the  undersigned  constitutes  and
appoints Mark C. Smith,  Howard A.  Thrailkill  and John R. Cooper,  and each of
them,  his true and  lawful  attorneys-in-fact  and  agents,  with full power of
substitution,  for  him  and in his  name,  place  and  stead,  in any  and  all
capacities,  to sign the  Annual  Report on Form 10-K of  ADTRAN,  Inc.  for the
fiscal year ended December 31, 1998, and any and all amendments thereto,  and to
file the same,  with all  exhibits  thereto and other  documents  in  connection
therewith,  with the  Securities  and Exchange  Commission,  granting  unto said
attorneys-in-fact  and agents,  and each of them, full power and authority to do
and perform each and every act and thing  requisite or necessary to be done,  as
fully to all  intents  and  purposes  as he might or could do in person,  hereby
ratifying and  confirming all that said  attorneys-in-fact  and agents or any of
them, or their or his substitute or substitutes,  may lawfully do or cause to be
done by virtue hereof.


 This 19th day of January,1999. 
                                              /s/ James L. North 
                                                  James L. North
<PAGE>




<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>
     THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED STATEMENT OF INCOME FOR THE TWELVE MONTHS ENDED DECEMBER 31, 1998
AND THE CONDENSED  BALANCE SHEET AS OF DECEMBER 31, 1998 AND IS QUALIFIED IN 
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
     (Replace this text with the legend)
</LEGEND>
<CIK>                                        0000926282                  
<NAME>                                       ADTRAN, Inc.
<MULTIPLIER>                                  1
<CURRENCY>                                    US Dollar
       
<S>                                           <C>
<PERIOD-TYPE>                                 12-mos
<FISCAL-YEAR-END>                             DEC-31-1998
<PERIOD-START>                                JAN-01-1998
<PERIOD-END>                                  DEC-31-1998
<EXCHANGE-RATE>                               1
<CASH>                                        $10,009,320
<SECURITIES>                                   40,795,068
<RECEIVABLES>                                  47,547,124
<ALLOWANCES>                                      958,805
<INVENTORY>                                    65,700,576
<CURRENT-ASSETS>                              167,561,408
<PP&E>                                        108,797,258
<DEPRECIATION>                                 29,902,941
<TOTAL-ASSETS>                                301,710,725
<CURRENT-LIABILITIES>                          17,026,649
<BONDS>                                        50,000,000
                                   0
                                             0     
<COMMON>                                          394,235
<OTHER-SE>                                    231,388,936
<TOTAL-LIABILITY-AND-EQUITY>                  301,710,725
<SALES>                                       286,558,950
<TOTAL-REVENUES>                              286,558,950
<CGS>                                         130,009,879
<TOTAL-COSTS>                                 130,009,879
<OTHER-EXPENSES>                               62,060,907
<LOSS-PROVISION>                                        0
<INTEREST-EXPENSE>                              2,286,821
<INCOME-PRETAX>                                60,615,256
<INCOME-TAX>                                   20,305,606
<INCOME-CONTINUING>                            40,309,650
<DISCONTINUED>                                          0
<EXTRAORDINARY>                                         0
<CHANGES>                                               0
<NET-INCOME>                                   40,309,650
<EPS-PRIMARY>                                        1.03
<EPS-DILUTED>                                        1.03              
        


</TABLE>


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