ADTRAN INC
10-K, 1998-03-31
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, 1997

        [ ] 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
                                                          dentification 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 12, 1998 was $568,848,69.  There
were 39,402,679 shares of Common Stock outstanding as of March 12, 1998.


                       DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Proxy  Statement for the Annual  Meeting of  Stockholders  to be
held on April 27, 1998 are incorporated herein by reference in Part III.

<PAGE>

                                   ADTRAN, Inc.
                          Annual Report on Form 10-K
                For the Fiscal Year Ended December 31, 1997

                              Table of Contents

Item                                                                     Page
Number                                                                   Number

                                    PART I

        1.      Business                                                    3

        2.      Properties                                                 15

        3.      Legal Proceedings                                          15

        4.      Submission of Matters to a Vote of Security Holders        16

                                   PART II

        5.  Market for the Registrant's Common Equity and Related 
           Stockholder Matters                                             18

        6.  Selected Financial Data                                        18
 
        7.  Management's Discussion and Analysis of Financial Condition
            and Results of Operations                                      20
               
        8.  Financial Statements and Supplementary  Data                   24

        9.  Changes in and Disagreements with Accountants on
            Accounting and Financial Disclosure                            38 

                                   PART III

       10.  Directors and Executive Officers of the Registrant             38

       11.  Executive Compensation                                         38
      
       12.  Security Ownership of Certain Beneficial Owners and 
            Management                                                     39

       13.  Certain Relationships and Related Transactions                 39
 
                                   PART IV 

       14.  Exhibits,Financial Statement, financial Statement Schedules,
            and Reports on Form 8-K                                        39

                                         SIGNATURES                        42
                                      INDEX OF EXHIBITS                    45
<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 a core technology 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 such as  dataports,  channel and data service  units,  and
digital  repeaters  and  extenders.  The Company also offers a broad line of T-1
multiplexers  providing modular  flexibility to the CPE marketplace.  A separate
T-1 product line is 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 Central Offices and (ii) CPE products for end-users.
In 1997,  sales  of  Telco  and CPE  products  accounted  for  64.8%  and  35.2%
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
or 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 or in
the trial stage, including Asymmetric Digital Subscriber Line ("ADSL"), Switched
Multi-megabit  Data  Services  ("SMDS"),  Asynchronous  Transfer  Mode  ("ATM"),
wireless transmission, hybrid fiber coax and cable modems.

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 is being  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 seven  Regional Bell Operating
Companies ("RBOCs"), GTE Corporation,  the three largest interexchange carriers,
many of the  1,300  independent  telephone  companies  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  four  years at a cost  expected  to  exceed
$150,000,000  of which,  almost  $50,000,000  had been  incurred at December 31,
1997.  Fifty  million 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 will
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 six
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 six
years. The Company intends to develop new  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  intends 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
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  that extend the
service range of the Local Loop, as well as optional  termination units that are
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 technology 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
generally requires a unit of this type to provide service to each subscriber. In
1997,  the Company  delivered  more than 749,856  units of this  product  group,
accounting  for 76.7% of the  Company's  total  units  shipped.  Telco  products
accounted  for  64.8%  and  68.7%  of the  Company's  sales  in  1997  and  1996
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.  The Company is also a leading  industry
supplier of mid-span DDS repeaters. 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 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.

The list price for the Company's Telco product family generally ranges from $100
to $1,000 per unit. The following table illustrates the breadth of the Company's
Telco products and their applications:


                          Representative Telco Products

  Product                                                                Current
 or Product                                                              Product
  Family             Description                    Application       Generation




DDST                 Digital Data Station         Terminates DDS           4th
                     Terminations                 (up to 64 Kbit/sec);
                                                  monitors and tests 
                                                  DDS lines

DSO-DP              Digital Signal Zero           Interconnects 2          5th
                    Data Ports                    channels in the     
                                                  Telco Central Office


HDSL                High bit-rate Digital         Delivers repeaterless   5th   
                    Subscriber Line Units         T-1(1.544 Mbit/sec) up
                                                  to 12,000 ft.
                    

LR 56/72            DDS Loop Repeaters            Extends DDS Circuit      4th
                                                  Range

OCU-DP              Office Channel Units          Provides DDS             8th
                    Data Ports                    (up to 64 Kbit/sec)


U-BR1TE             U-Basic Rate Transmission     Extends ISDN (up to      3rd
                    Extenders                     128 Kbit/sec) to Central
                                                  Offices/remote huts
                                                  without ISDN Switch 

U-Repeater          ISDN Loop Repeaters           Extends ISDN Circuit     3rd
                                                  Range

Total Reach ISDN    Extended Range ISDN           Delivers ISDN servies    2nd
                                                  (up to 128 Kbit/sec) up
                                                  to 30,000 feet over a 
                                                  single copper pair

Tracer              Wireless T1 Transmission      Delivers two T1's over   1st
                                                  wireless digital spread
                                                  spectrum microwave radio

Total Reach DDS     Extended Range DDS            Delivers DDS services    1st
                                                  (up to 64 Kbit/sec) up
                                                  to 40,000 feet over a 
                                                  single copper pair
                    
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 35.2% and 31.3% of the Company's  sales in 1997
and 1996, respectively.

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.

Over the  past  three  years,  Frame  Relay  Services  have met with  increasing
customer acceptance.  As a result, the Company has introducted a family of Frame
Relay Service units (FSU).  These products are built from the core  technologies
utilized in the existing DSU and TSU product families.

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.  Recently, 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 new ISDN terminal  adapters,  the Express XR and XRT,  utilize
this technology.  Additionally,  these products 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 TSU product line  augments the Company's
mature line of ACT Channel Banks that  accommodate most  commercially  available
channel  units,  including  those  offered  by the  Company's  competitors.  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  intoduced its new ATLAS 800 Integrated Access System.
The ADTRAN Total 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.

The list price for the CPE product family  generally  ranges from $500 to $2,000
per unit.  The  following  table  illustrates  the breadth of the  Company's CPE
products and their applications:

Representative CPE Products

  Product                                                               Current
or Product                                                              Product
  Family                 Description             Application         Generation

Act Channel Bank         T-1 (1.544 Mbit/sec)    Provides user access      3rd
                         Channel Banks,          to each of 24 channels
                         compatible with D-4     in T-1 service
                         Channel Units
                   
DSU                      Data Service Units/     Connects data terminal    4th
                         Channel Service Units   equipment to DDS 
                                                 (up to 64 Kbit/sec);
                                                 standard interface
                                                 for data processing
                                                 equipment

SMART 16                 Shelf-Mount Systems     Provides means for        2nd
                                                 end-users to plug in
                                                 multiple DSU, TSU
                                                 and ISU circuit
                                                 assemblies

ISU                      ISDN Service Units      Connects data terminal    3rd
                                                 equipment to ISDN
                                                 (up to 128 Kbit/sec)
                                                 network

TSU                      T-1 Data Service        Connects data terminal    2nd
                         Units/Channel Service   equipment to T-1
                         Units                   (1.544 Mbit/sec) 
                                                 network 


T1-CSU                   T-1 Channel Service     Provides T-1              3rd
                         Units                   termination

NT-1                     Network Termination     Provides ISDN             3rd
                                                 termination

FSU                      Frame Relay Service     Provides Frame Relay      1st
                         Unit                    circuit termination

ATLAS                    Integrated Access        Consolidates voice,      1st
                         System                   data and video into a
                                                  single, scaleable 
                                                  platform


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
technology 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  (8.7% of total  sales in 1997),  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  1997 Annual
Report to Stockholders.

As of December 31, 1997, the Company's product development programs were carried
out by 252 engineers and engineering support personnel, comprising approximately
25% 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 1997, 1996 and 1995, product
development  expenditures  totaled  $30,055,091,  $24,647,425,  and $19,131,457,
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 1998 than it did in 1997.

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, 1997, 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 seven RBOCs and most of the
major independent domestic Telcos. The major customers of the Company include:

        Alltel Corporation                   Hong Kong Telecom
        Ameritech Corp.                      NYNEX Corp.
        Azteca Telecommunications            Pacific Bell
        Bell Atlantic Network Services       Solunet, Inc.
        BellSouth Corp.                      Siemens Corp.
        Bloomberg L.P.                       Southwestern Bell Corp.
        Cincinnati Bell                      Sprint Corp
        Cisco Systems, Inc.                  Tech Data, Inc.
        Eltrax                               US West, Inc.
        GTE Corp.                            

Historically,  a large  percentage of the Company's sales have been to the seven
RBOCs (31.7% in 1997) and other Telcos (33.0% in 1997). GTE and Sprint accounted
for 19.5% and 10.0%,  respectively,  of the  Company's  total sales in 1997.  No
other customer accounted for 10% or more of the Company's sales in 1997.

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  ensuing  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, 1997, the Company's  marketing,  sales and  distribution
programs were conducted by 166  employees.  The Company sells its Telco products
in the United States  directly to the Telcos through a field sales  organization
based in 39  locations  (some of these work out of their homes) in the United
States, Canada, and it sells its Telco products  internationally  through a Hong
Kong sales office 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 re-sellers.  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  contract  with TSS (formerly
General Electric) 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 all 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, subassemblies, chassis, enclosures
and equipment  shelves.  The Company  subcontracts the assembly of a significant
portion of its lower  priced  products  to a company 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
inventory  represented  an  acceptable  range of 26% to 43% of  working  capital
during 1997.

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  which  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 such as Conklin Instrument Corporation and Integrated Network Corporation.

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 Motorola,  Inc., 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 Verilink Corporation. The Company's T-1 multiplexer product
line's  key  competitors   include   Newbridge   Networks   Corporation,   Pulse
Communications,  Inc. and TELCO Systems,  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  which AT&T had enjoyed for years in most U.S.
local and long  distance  telephone  service  and  equipment  markets,  and (ii)
prohibiting  the RBOCs  which  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, 1997, the Company had 1008 full-time employees in the United
States,  two in Canada and one in Hong Kong. Of the Company's  total  employees,
255 were in sales, marketing, distribution and service, 252 were in research and
development, 376 were in manufacturing, and 128 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.  Plans are being made to expand its
facilities in Huntsville by approximately  600,000 square feet (to accommodate a
projected total of 3,000  employees) over the next four years at a cost expected
to exceed $150,000,000 of which almost $50,000,000 had been incurred at December
31, 1997. See "Management's  Discussion and Analysis of Financial  Condition and
Results of Operations - Liquidity and Capital  Resources" in the Company's  1997
Annual Report to Stockholders and Note 6 of Notes to Financial Statements.

The Company  also  maintains  39 sales and service  facilities,  36 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,
Leakwood,  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 Leakwood,  KS, Irvine,  CA, Denver,
CO,  Atlanta,   GA,  Irving,  TX,  Altamonte  Springs,   FL,  Herndon,   VA  and
Philadelphia,  PA are leased under leases which expire at various  times between
1998 and 20010. See Note 9 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 which could have a material adverse effect on the Company.


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, 1997.


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, 1997

Mark C. Smith  -  Age 57

        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 69

        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 59

        1995 to present President, Chief Operating Officer and Director

        October 1995    Executive Vice President, Chief Operating Officer
                        and Director

        1992 - 1995     Executive Vice President, Chief Operating Officer



John R. Cooper  -  Age 50

        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 38

        1995 to present Vice President - CPE Marketing

        1994 - 1995     Director of Marketing

        1989 - 1994     Manager of Product Management



Thomas R. Stanton  -  Age 33

        1995 to present Vice President  - Telco Marketing

        1994 - 1995     Sr. Director, Marketing, E.F. Johnson Company

        1993-1994       Director, Marketing, E.F. Johnson Company



Peter O. Brackett  -  Age  56

        1996 to present Vice President - Technology

        1992 - 1996     Research Manager, Advanced Data Networking, Bellsouth



M. Melvin Bruce  -  Age 57

        1996 to present Vice President - Engineering

        1989 - 1996     Vice President, Research and Design, TCI



Robert A.  Fredrickson  -  Age 47

        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 37

        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  -  43

        1996 to present  Vice President  -  Quality

        1993  - 1996     Quality & Technical Resources Manager,
                         Exide Electronics Corp.


Jude T. Panetta  -  Age 38

        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.

                         
                                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 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 March 12, 1998, the Company
had approximately 625 shareholders of record and approximately 14,200 beneficial
owners of shares held in street name..  The  following  table shows the high and
low closing  sale prices per share of Common Stock as reported by Nasdaq for the
periods indicated:


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


1996 Quarters                      High                     Low

First                              $54-3/4                  $26-1/2
Second                             $73-1/2                  $45
Third                              $75-1/4                  $47-1/2
Fourth                             $52-1/4                  $33-1/2


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.

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, 1997 are
derived from the financial statements of the Company, which financial statements
have been audited by Coopers & Lybrand L.L.P.,  independent  accountants.  The
selected  financial  data is  qualified  in its  entirety  by the more  detailed
information  and financial  statements,  including the notes  thereto,  included
elsewhere in this report. The financial statements of the Company as of December
31,  1997 and  1996 and for each of the  years in the  three  year  period ended
December  31,  1997,  and the report of Coopers & Lybrand  L.L.P.  thereon,  are
included elsewhere in Item 8 of this report.

<TABLE>
<CAPTION>

                                              Year Ended December 31,
                              1997           1996            1995           1994           1993
                                   (in thousands, except per share data)

<S>                           <C>            <C>            <C>            <C>           <C>
Income Statement Data
Sales:
    Telco (1)                 $171,838        $171,902      $121,311       $87,888       $58,994
    CPE (1)                     93,497          78,219        60,167        35,552        13,417
       Total sales             265,335         250,121       181,478       123,440        72,411
Cost of sales                  130,254         129,953        93,007        63,187        36,769
    Gross profit               135,081         120,168        88,471        60,253        35,642
Selling, general and
   administrative expense       44,973          34,308        27,260        17,347        11,898
Research and development
   expenses                     30,055          24,647        19,131        13,774        10,033
    Operating income            60,053          61,213        42,080        29,132        13,711
Interest income                  4,175           2,542         3,205           440             7
Interest expense                (1,839)           (895)       (1,105)         (448)         (424)
Other income (expense)             438             642           111           (25)          (13)
    Income before income
      taxes (2)                 62,827          63,502        44,291        29,099        13,281
 Provision for income
     taxes (2)                  22,618          23,682        14,833         6,288             0
  Net income (2)                40,209          39,820        29,458        22,811        13,281
Pro forma provision for
     income taxes (2)                0               0             0         4,202         4,825
    Pro forma net income (2)    40,209          39,820        29,458        18,609         8,456
Pro forma net income per share
    assuming dilution(2)(3)(4)    1.02            1.01           .75           .51           .25
Earnings per common share
  - basic(2)(3)                   1.03            1.03           .80           .56           .27

Weighted average shares 
    outstanding assuming 
    dilution(3) (4)             39,565           39,549       39,249        36,199        34,098

S corporation distributions(2)                                              $5,483        $5,494

                                                                                                            
                                                           At December 31,
                                  1997           1996           1995          1994          1993
                                                           (in thousands)
Balance Sheet Data:
Working capital               $149,184         $140,510     $122,466       $66,368       $19,795
Total assets                   282,401          210,207      165,767        94,347        46,304
Total debt                      50,000           20,000       20,000             0        10,100
Stockholders' equity           212,037          172,879      130,743        85,233        29,757
</TABLE>

     (1) Represents sales of the Company's Telco and CPE products. These amounts
 are not derived from the Company's audited financial statements. 
     (2) 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  o fund the
income tax liabilities passed through to the stockholders.The Company also paid
a cash  distribution  of $3,121,816 to its  stockholders  in December 1992 in an
amount approximately equal to their original investment in the Company's Common
Stock.  As a C corporation,  the Company is subject to income taxes at corporate
tax rates. The pro forma income statement data herein presents the provision for
income  taxes,  net income and net income per share as if the  Company  had been
subject to corporate income taxes for all periods presented.
     (3)  Reflects  a 3-for-2  split of the  Company's  Common  Stock  which was
effected on August 1, 1994,  and a 2-for-1  split of the Common  Stock which was
effected on May 12, 1995.
     (4) Assumes  exercise of dilutive stock options  calculated  under the
treasury stock method. See Notes 1, 10, and 13 of Notes to Financial Statements.

<PAGE>



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


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 nonbinding 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.  The Company  currently does not undertake any foreign exchange risks,
as all transactions  with foreign vendors or customers are conducted in currency
of the United States. 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.

On August 16, 1994, the Company  completed an initial public  offering of Common
Stock,  receiving net proceeds (after  deduction of  underwriting  discounts and
other  offering  expenses) of $37,867,963  from the sale of 2,300,000  shares of
Common Stock (on a pre-split  basis).  The Company used the offering proceeds to
repay the full amount of principal  and interest  owed on certain  revenue bonds
issued to  construct  and equip the  Company's  headquarters  and  manufacturing
facility in Huntsville,  Alabama and to repay all amounts  outstanding under its
bank line of credit and for general working capital purposes.  On June 29, 1995,
the Company and certain stockholders of the Company (the "Selling Stockholders")
sold a total of 3,125,100 shares of Common Stock to the public. Of the 3,125,100
shares offered,  500,000 shares were offered by the Company and 2,625,100 shares
were  offered by the Selling  Stockholders.  The Company  received  net proceeds
(after  deduction of  underwriting  discounts  and other  offering  expenses) of
$15,705,362  from the sale of  500,000  shares  of  Common  Stock at the  public
offering price of $33 per share. The Company did not receive any of the proceeds
from the sale of shares by the  Selling  Stockholders.  The Company has used and
expects to continue  to use the  proceeds  of the public  offerings  for working
capital and other general  corporate  purposes,  including  product  development
activities  to enhance  its  existing  products  and develop  new  products  and
expansion of sales and marketing activities.

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.

When used in this 1997 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 made by the Company
which attempt to adivse interestedd parties of the factors which affect the
Company's business, including the disclosures made in other periodic reports
on Forms 10-K, 10-Q and 8-K, when appropriate, filed with the Securities and
Exchange Commission.

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                      1997          1996           1995
Sales:
     Telco                              64.8%          68.7%          66.8%
     CPE                                35.2           31.3           33.2
     Total sales                       100.0          100.0          100.0
Cost of sales                           49.1           51.9           51.3
     Gross profit                       50.9           48.1           48.7
Selling, general and
   administrative expenses              17.0           13.7           15.0
Research and development expenses       11.3            9.9           10.5
     Operating income                   22.6           24.5           23.2
Interest income                          1.6            1.0            1.8
Interest expense                        (0.7)          (0.4)          (0.6)
Other income (expense)                   0.2            0.3            0.0
Income before provision for
  income taxes                          23.7           25.4           24.4
Provision for income taxes               8.5            9.5            8.2
Net income                              15.2%          15.9%          16.2%


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 only
slightly, 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.  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  interest  cost  incurred  as a part  of the  cost of
acquiring certain assets.  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 "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.


1996 Compared to 1995

Sales
The Company's sales increased 37.8% from $181,478,065 in 1995 to $250,120,836 in
1996.  The  increased  sales  resulted from  increased  sales volume to existing
customers and from increased market penetration. Sales to Telcos increased 41.7%
from  $121,311,131  in 1995 to  $171,901,851  in 1996 due primarily to increased
sales of Integrated Services Digital Network (ISDN) products and increased sales
of High  bit-rate  Digital  Subscriber  Line (HDSL)  products.  Telco sales as a
percentage  of  total  sales  increased  from  66.8%  in 1995 to  68.7%  in 1996
primarily as a result of increased sales volume of ISDN and HDSL products during
the 1996 period.  Sales of CPE products increased 30.0% from $60,166,935 in 1995
to $78,218,985 in 1996. The increase in sales of CPE products is attributable to
increased demand for Digital Data Service (DDS) products,  T1 Service Unit (TSU)
products, and Integrated Services Digital Network (ISDN) products.

Cost of Sales
Cost of sales increased 39.7% from  $93,006,672 in 1995 to $129,953,371 in 1996,
primarily as a result of the increase in sales.  As a percentage of sales,  cost
of sales increased from 51.3% in 1995 to 51.9% in 1996. 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 25.9% from $27,259,610 in
1995 to  $34,308,436  in 1996 due to additional  sales and support  expenditures
necessary as a result of the Company's expanded sales base. However,  the larger
sales base caused selling,  general and administrative  expenses as a percentage
of sales to decrease from 15.0% in 1995 to 13.7% in 1996.

Research and Development Expenses
Research and development  expenses  increased 28.8% from  $19,131,457 in 1995 to
$24,647,425  in 1996.  This  increase  was due to  increased  engineering  costs
associated  with  new  product   introductions  and  product  cost  and  feature
enhancement  activities.  As  a  percentage  of  sales,  however,  research  and
development  expenses  declined from 10.5% in 1995 to 9.9% in 1996.  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.

Interest Expense
Interest  expense  decreased  19.0% from $1,105,156 in 1995 to $894,657 in 1996.
This  decrease was due to  capitalization  of the interest cost as a part of the
cost of  acquiring  certain  assets.  The  Company  currently  pays  interest on
$20,000,000  of revenue  bond  proceeds  loaned to the Company in January  1995,
which proceeds are being used to expand the Company's  facilities in Huntsville,
Alabama. See "Liquidity and Capital Resources."

Net Income
As a result of the above factors, net income increased 35.2% from $29,457,727 in
1995 to $39,819,904 in 1996. As a percentage of sales, net income decreased from
16.2% in 1995 to 15.9% in 1996.


Liquidity and Capital Resources

The Company is  continuing  a project to expand its  facilities  in  Huntsville,
Alabama  in  phases  over  the next  four  years at a cost  expected  to  exceed
$150,000,000,  of which  almost  $50,000,000  had been  incurred at December 31,
1997.  Fifty million of this project has been 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 will
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  $140,509,802 as of
December 31, 1996 to $149,183,578  as of December 31, 1997. This  improvement in
the Company's working capital position was due primarily to increased  earnings.
The Company has used, and expects to continue to use, the remaining  proceeds of
its earlier  public  offerings 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  decreased  3.5% for the twelve months ended December 31,
1997 due to overall efficiencies in manufacturing operations.

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. As of December
31, 1997, the Company had  re-purchased  100,000 shares of its common stock at a
total cost of $2,200,000.

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

At December 31, 1997,  the  Company's  cash on hand of  $45,340,961,  short-term
investments of $37,833,240 and $10,000,000 available under a bank line of credit
placed the Company's  potential cash availability at $93,174,201.  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, 1998. 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,  the  remaining  net proceeds of its earlier  public
offerings,  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 Compliance

The Company is in the process of  reviewing  current  software  and  hardware to
assess the impact of the year 2000 issue. Initially,  the Company has determined
that most of the Company's  current  business  process software and hardware are
year 2000 compliant.  The Company is in the process of implementing new business
process  software  which has been  determined to be year 2000 compliant as well.
This implementation should be completed in 1998. The Company expects to complete
its year  2000  analysis  by the end of 1998 and does  not  believe  that  costs
associated  with bringing the Company's  computer  systems into full  compliance
with year 2000 will  result in  material  costs to the  Company.  The  Company's
products  are year 2000  compliant as well and  therefore,  the Company does not
believe that they have any  material  exposure to  contingencies  related to the
year 2000 issue for products it has sold. The Company is also in the preliminary
stages of assessing  the impact of the year 2000 issue on its major vendors and
suppliers to determine  the extent to which the Company is  vulnerable  to those
third  parties'  failure  to  remediate  their  own year  2000  issues. 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 the  Company's  internal  systems  or those of its major
suppliers and customers.  However, there can be no guarantee that the systems of
other companies on which the Company's system rely will be timely converted,  or
that a failure to convert by another  company would not have a material  adverse
impact on the Company. 

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

The following financial statements are contained in this report.
                                                                      Page

     Report of Independent Certified Public Accountants                25

     Financial Statements for Years Ended December 31, 1997,
       1996 and 1995

          Balance Sheets                                               26     
          Statements of Income                                         27
          Statements of Changes in Stockholders' Equity                28
          Statements of Cash Flows                                     29

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


Report of Independent Accountants
To the  Board of Directors and Stockholders
ADTRAN, Inc.

We have audited the accompanying  balance sheets of ADTRAN,  Inc. as of December
31,  1997  and  1996,  and  the  related   statements  of  income,   changes  in
stockholders'  equity,  and cash flows for each of the three years in the period
ended December 31, 1997. 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.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all material respects, the financial position of ADTRAN, Inc. as of December 31,
1997, and 1996, and the results of its operations and its cash flows for each of
the three years in the period  ended  December  31,  1997,  in  conformity  with
generally accepted accounting principles.




/s/ Coopers & Lybrand L.L.P.
COOPERS & LYBRAND  L.L.P.
Birmingham, Alabama
January 13, 1998
<PAGE>

BALANCE SHEET

December 31, 1997 and 1996

                                                       1997           1996
ASSETS
Current Assets:
Cash and cash equivalents                              $45,340,961   $44,839,131
Short-term investments                                  37,833,240    32,555,930
Accounts receivable, marked to market, less
  allowance for doubtful accounts of $893,389 and 
  $872,724 in 1997 and 1996, respectively               40,906,887    33,825,560
Other receivables                                          343,463       362,578
Inventory                                               39,369,103    40,792,646
Prepaid expenses                                         1,148,288     2,261,338
Deferred income taxes                                    2,458,136     1,598,750
     Total current assets                               67,400,078   156,235,933
Property, plant and equipment,  net                     64,801,132    53,971,213
Other assets                                               200,000             0
Long-term investments                                   50,000,000             0
     Total assets                                     $282,401,210  $210,207,146



LIABILITIES AND  STOCKHOLDERS' EQUITY

Current liabilities:
Accounts payable                                       $9,121,270     $9,350,266
Accrued salaries                                        1,927,364      2,454,194
Accrued income taxes                                    4,579,345      1,803,706
Accrued taxes other than income taxes                     180,611        338,997
Accrued interest payable                                        0         59,594
Warranty liability                                      1,435,259      1,026,156
Compensated absences                                      972,651        693,218
Total current liabilities                              18,216,500     15,726,131
Bonds payable                                          50,000,000     20,000,000
Deferred income taxes                                   2,147,635      1,602,116
     Total liabilities                                 70,364,135     37,328,247


Stockholders' equity:
     Commonstock,  par  value  $.01  per  share; 
       200,000,000 shares authorized;  39,381,264 
       shares issued in 1997 and 38,769,514 in 1996       393,813        387,695
     Additional paid-in capital                        90,582,615     90,172,863
     Retained earnings                                123,260,647     82,318,341
     Less 100,000 shares treasury stock, at cost       (2,200,000)             0

         Total stockholders' equity                   212,037,075    172,878,899

         Total liabilities and stockholders'equity   $282,401,210   $210,207,146




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


<PAGE>
STATEMENTS OF INCOME
for the years ended December 31, 1997, 1996 and 1995




                                        1997          1996           1995
Sales                              $265,334,768   $250,120,836   $181,478,065
Cost of sales                       130,253,531    129,953,371     93,006,672
    Gross profit                    135,081,237    120,167,465     88,471,393

Selling, general and
  administrative expenses            44,973,175     34,308,436     27,259,610
Research and development expenses    30,055,091     24,647,425     19,131,457

   Income from operations            60,052,971     61,211,604     42,080,326
Other income (expenses):
     Interest income                  4,175,032      2,542,417      3,204,902
     Interest expense                (1,838,814)      (894,657)    (1,105,156)
     Other                              437,639        642,432        111,219

                                      2,773,857      2,290,192      2,210,965


Income before income taxes           62,826,828     63,501,796     44,291,291
Provision for income taxes           22,617,556     23,681,892     14,833,564

    Net income                      $40,209,272    $39,819,904    $29,457,727


Weighted average shares 
  outstanding assuming
  dilution (1)                       39,565,497     39,548,654     39,249,101


Earnings per common share 
  assuming dilution (1)                   $1.02          $1.01          $0.75

Earnings per common share - basic         $1.03          $1.03          $0.80




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>

STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY
for the years ended December 31, 1997, 1996 and 1995
<TABLE>
<CAPTION>
                              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, 1994        18,073,598     $180,736       $73,545,813    $11,506,784         $0      $85,233,333


Stock options exercised
 through issuance of
 common stock:
  Various prices 
   per share                460,619        4,606           342,283                                   346,889
Issuance of common stock
  in June 1995 through a 
  public offering of shares,
  net of offering costs     500,000        5,000         15,700,362                               15,705,362
Issuance of shares to
  effect stock split,
  (see Note 8)           18,428,058      184,281           (184,281)
Net Income                                                             29,457,727                 29,457,727


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


Stock options exercised
 through issuance of 
 common stock:
  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
 through issuance of
 common stock:
  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 benefit 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
</TABLE>

The accompanying notes are an integral part of these financial statements.
<PAGE>
STATEMENTS OF CASH FLOW

for the years ended December 31, 1997, 1996 and 1995
<TABLE>
<CAPTION>
                                                            1997           1996             1995
Cash flows from operating activities:
<S>                                                     <C>           <C>             <C>   

Net income                                              $40,209,272    $39,819,904     $29,457,727
Adjustments to reconcile net income to net
 cash provided by operating activities:  
Depreciation                                              7,342,518      4,890,303       3,052,798
Provision for warranty claims                             1,435,259      2,110,614         776,908
Loss on sale of property, plant, and equipment               (9,884)        40,572           8,842
Loss on sale of short-term investments
 classified as available-for-sale                            (6,063)       405,789         169,766
Deferred income taxes                                      (313,867)       104,561         (31,910)
Change in operating assets:             
Accounts receivable                                      (7,081,327)    (4,590,757)    (11,212,334)
Inventory                                                 1,423,543      4,204,549     (17,472,844)
Other current assets                                        932,165     (1,083,019)       (270,724)
Change in operating liabilities:
Accounts payable(                                          (228,996)      (390,321)      3,245,924
Other liabilities                                         1,284,106        (50,491)      1,584,749
Net cash provided by operating activities                44,986,726     45,461,704       9,308,902


Cash flows from investing activities:
Expenditures for property, plant and equipment          (18,220,850)   (29,661,438)    (12,790,517)
Proceeds from the disposition  of property, plant,
 and equipment                                               58,297          4,602          14,250
Purchase of restricted investments                      (50,000,000) 
Purchase of short-term investments classified
 as available-for-sale                                   (5,271,247)    (8,309,030)    (16,322,455)
Net cash used in investing activities                   (73,433,800)   (37,965,866)    (29,098,722)


Cash flows from financing activities:
Redemption of bonds payable                             (20,000,000)      
Proceeds from bond issuance                              50,000,000                     20,000,000
Proceeds from public offering, 
 net of expenditures                                                                    15,705,362
Proceeds from issuance of  common stock                     415,870        781,758         346,889
Income tax benefit from exercise of non-qualified
 stock options                                              733,034      1,533,926
Purchase of treasury stock                               (2,200,000)
Net cash provided by financing activities                28,948,904      2,315,684      36,052,251


Net increase in cash and cash equivalents                   501,830      9,811,522      16,262,431
Cash and cash equivalents,  beginning of year            44,839,131     35,027,609      18,765,178

Cash and cash equivalents,end of year                   $45,340,961    $44,839,131     $35,027,609
Supplemental disclosure of cash  flow information:
   Cash paid during the year for interest, net of
    capitalized interest of  $204,153, $393,096 
    and $235,928 in 1997, 1996 and 1995, respectively   $ 1,844,741      $ 909,368      $1,030,851        
   Cash paid during the year for income taxes           $20,042,644    $22,151,925     $13,033,140

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

Notes to Financial Statements

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  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 1997, 1996, and 1995.

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
computed in compliance with SFAS No. 128, which the Company adopted December 31,
1997. This statement  simplifies the standards for computing  earnings per share
previously  found in APB  Opinion  No. 15,  Earnings  per Share,  and makes them
comparable to  international  EPS  standards.  It replaces the  presentation  of
primary  EPS  with a  presentation  of  basic  EPS.  The  statement  requires  a
computation for earnings per common share and earnings per common share assuming
dilution (see Note 13).

Reclassifications:
Certain  reclassifications  have  been  made  to the  1995  and  1996  financial
statements and related  footnotes to conform with the 1997  presentation.  These
reclassifications had no impact on retained earnings or net income.

Recently Issued Accounting Standards:
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,  and SFAS No. 131,  Disclosures
about Segments of an Enterprise and Related Information, which specifies revised
guidelines for determining an entity's operating segments and the type and level
of financial information to be required.  The Company is required to adopt these
standards   in  1998.   The  Company   does  not  expect  the  impact  of  these
pronouncements to be material.

2.   Investments

At December 31, 1997 and 1996,  the Company  held the  following  securities  as
available-for-sale  or  held-to-  maturity  recorded  at  amortized  cost  which
approximates fair value:

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


1996

Short-term investments, available-for-sale:

Municipal Bonds                                        $10,055,930
Re-marketed preferred stocks: 
GE Capital preferred asset corporation A series A        5,000,000
Merrill Lynch preferred series G                         5,000,000
Muniyield Fund Auction preferred series A                5,000,000
VKM Investment Grade Municipal Trust preferred           5,000,000
Nuveen Premium Income Fund preferred series A            2,500,000

Total short-term investments in 1996                   $32,555,930

Cash equivalents, held-to-maturity:



Triple A One Plus, zero coupon bonds,
  matured January 10, 1997                             $ 4,992,889    
Receivables Capital, zero coupon bonds,   
  matured January 10, 1997                               4,992,889
Barton Corporation, zero coupon bonds,
  matured January 15, 1997                               4,989,248
Three Rivers Funding, zero coupon bonds,
  matured January 16, 1997                               4,988,533

Total cash equivalents in 1996                         $19,963,559




3.    Inventory

At December 31, 1997 and 1996  inventory consisted of the following:


                                           1997                   1996
Raw materials                           $24,199,720         $24,454,251
Work in process                           2,565,179           2,963,220
Finished goods                           12,604,204          13,375,175
                                        $39,369,103         $40,792,646


4.   Property, Plant, and Equipment

Property,  plant, and equipment comprised the following at December 31, 1997
and 1996:

                                              1997                  1996
Land                                    $ 4,263,104              $ 4,263,104
Building                                 28,673,642               26,230,470
Construction in progress                  3,081,702                2,021,525
Land improvements                         7,963,770                7,177,261
Office machinery and equipment           17,184,334                8,338,789
Engineering machinery and equipment      24,534,852               19,577,071
                                         85,701,404               67,608,220
Less accumulated depreciation           (20,900,272)             (13,637,007)

                                        $64,801,132              $53,971,213



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, 1997 and 1996, the Company had no borrowings against this line. The
line of credit expires on May 1, 1998.


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 in the total amount of
$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 has agreed to make  payments to the  Authority  in
amounts  necessary  to pay the  principal  of and  interest  on the  Amended and
Restated  Bond.  Construction  on the  project  began in March 1995 and  certain
phases were completed by December 31, 1997.




7.   Income Taxes

A summary of the  components of the  provision  (benefit) for income taxes as of
December 31 is as follows:


                                   1997           1996           1995


Current:
   Federal                    $21,251,520    $21,329,522    $13,896,982
   State                        1,679,903      2,247,809        968,492
Total Current                  22,931,423     23,577,331     14,865,474
Deferred tax provision
  (benefit)                      (313,867)       104,561        (31,910)
Total historical provision 
  for income taxes             22,617,556    $23,681,892    $14,833,564


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

                                   1997           1996           1995
Tax provision computed at the
  federal statutory rate 
  (35% in 1997, 1996
  and 1995)                   $21,989,390    $22,225,629    $15,501,952
State income tax provision, 
  net of federal benefit        1,091,936      1,461,076        629,520
Federal research credits       (1,248,925)      (151,500)      (815,408)
Permanent differences
 and other                        785,155        146,687       (482,500)
                              $22,617,566    $23,681,892    $14,833,564

Temporary differences which create deferred tax assets and liabilities at
December 31, 1997  and 1996 are detailed below.

                                   1997                             1996

                         Current       Non-current        Current    Non-current
Property, plant and
equipment                               ($2,147,635)                ($1,602,116)
Accounts receivable    $  381,022                        $ 341,584
Inventory               1,130,083                          584,204
Accruals                  947,031                          672,962
Deferred tax asset 
  (liability)          $2,458,136       ($2,147,635)    $1,598,750  ($1,602,116)

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


8.   Stock Split

     On April 20,  1995,  the  stockholders  approved  the  board of  directors'
recommendation to increase  authorized common stock from 30 million shares to 60
million shares,  par value $.01.  Following  approval by the board of directors,
the  Company  declared  a 2-for-1  stock  split,  payable  on May 12,  1995,  to
stockholders of record on April 27, 1995. All common stock information  included
in  the  financial   statements,   except  in  the   statements  of  changes  in
stockholders' equity, gives retroactive effect to this stock split.

9.   Operating Leases

The Company  leases office space and equipment  under  operating  leases.  As of
December 31, 1997,  future  minimum rental  payments  under the  non-cancellable
operating leases are approximately as follows:

1998                                               $  529,000
1999                                                  329,000
2000                                                  125,000
2001                                                   45,000

                                                   $1,028,000

Rental expense was approximately $657,000, $851,000, $447,000 in 1997, 1996
and 1995, respectively.


10.    Employee Incentive Stock Option Plan and Director's 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 have been  reserved as of December 31, 1997 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,  1997 range from 1998 to
2007.

The Board of  Directors of the Company  adopted a  Director's  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, 1997, 36,000 options have been granted
under the plan.  Expiration  dates of options  outstanding  under the Director's
Stock Option Plan at December 31, 1997 range from 2005 to 2007.

Pertinent information regarding the Plans is as follows:

<TABLE>


                                                                                   Weighted
                                              Number              Range of           Average
                                                of                Exercise          Exercise         Vesting
                                              Options              Prices            Price         Provisions


<CAPTION>
<S>                                          <C>                 <C>                <C>            <C>
Options outstanding, December 31, 1994       2,902,574           $.06  -  $12.53      $0.49         100% /year
Options granted                                 84,350          $22.50 -  $46.25     $34.86         100% /year
Options cancelled                               (1,450)                   $31.75     $31.75         100% /year
Options exercised                             (815,079)          $.06  -   $3.33      $0.43         100% /year


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
</TABLE>


The following table summarizes  information  about stock options  outstanding at
December 31, 1997:


<TABLE>
<CAPTION>
                                        Weighted
                                        Average             Weighted                           Weighted
Range of            Number             Remaining            Average        Number              Average
Exercise            Outstanding        Contractual         Exercise        Exercisable         Exercise
Prices              12/31/97            Life                Price          12/31/97            Price
<S>                 <C>                <C>                <C>             <C>                 <C>
$0.17-$2.50         135,831             2.80                 $1.64          135,831             $1.64
$3.00-$22.50         54,225             5.91                 $5.46           52,925             $5.06
$25.38-$25.38       676,450             9.54                $25.38                0             $0.00
$27.50-$42.38       109,050             7.98                $36.10           69,850            $35.76
$42.72-$42.72         3,000             9.11                $42.72                0             $0.00
$46.25-$46.25         3,500             8.03                $46.25            3,100            $46.25
$56.25-$56.25         5,000             8.54                $56.25            5,000            $56.25
$59.50-$59.50         3,500             8.56                $59.50              700            $59.50
$63.75-$63.75        22,500             8.65                $63.75            4,500            $63.75
$65.75-$65.75       263,400             8.53                $65.75           53,000            $65.75

                  1,276,456                                                 324,906
</TABLE>


The options above were issued at exercise prices which  approximate  fair market
value at the date of grant. At December 31, 1997, 1,513,250 shares are 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:





                                          1997           1996           1995
Net income - as reported           $40,209,272    $39,819,904    $29,457,727
Net income - pro forma             $37,634,225    $38,018,766    $28,852,035
Earnings per share - as reported   
    assuming dilution                    $1.02          $1.01          $0.75
Earnings per share - pro forma
     assuming dilution                    $.96           $.96          $0.73

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>
<CAPTION>
<S>                                     <C>                   <C>               <C>      
                                               1997               1996               1995
Dividend yield                                  0%                 0%                 0%
Expected life (years)                           5                  5                  5
Expected volatility (range)              47.07%  - 49.19%    48.59%  - 49.25%   49.40%  -  %2.37%
Risk-free interest rate (range)            6.01% - 6.69%       5.86% - 7.12%      6.23% - 8.29%
</TABLE>


11.    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-third  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 $717,196,  $547,072,  $415,791 in
1997, 1996 and 1995, respectively.

12.   Major Customers

Sales of the  Company's  transmission  and test  equipment to the Regional  Bell
Operating  Companies (RBOCs) amounted to approximately 33%, 36% and 40% of total
sales during the years ended December 31, 1997, 1996 and 1995, respectively.  At
December 31, 1997, 1996 and 1995 respectively,  26%, 23% and 36% of the accounts
receivable balance consisted of amounts due from RBOCs.


13.      Earnings Per Share

A summary of the  calculation  of basic and diluted  earnings  per share for the
years ended December 31, 1997, 1996 and 1995 is as follows:



                                                       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



                                                       For the Year Ended 1995

                                   Income              Shares         Per-Share
                                (Numerator)        (Denominator)        Amount
Basic EPS
Income available to common
 stockholders                   $29,457,727           36,984,156       $0.80
Effect of Dilutive Securities
Stock Options                             0            2,264,945
Diluted EPS
Income available to common 
 stockholders + assumed
 conversions                    $29,457,727            39,249,101      $0.75


The following options were outstanding  during the respective year granted,  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.  All options were still  outstanding at year end
1997 except for 23,100 options  granted in 1996 with an exercise price of $65.75
which  were  cancelled  during  1997 and 2,500  options  granted in 1995 with an
exercise price of $46.25 which were cancelled during 1997.

<TABLE>
<CAPTION>
            1997                                  1996                           1995

Options     Exercise   Expiration      Options    Exercise  Expiration   Options     Exercise  Expiration
Granted     Price                      Granted    Price                  Granted     Price     
<S>         <C>          <C>          <C>         <C>       <C>          <C>         <C>       <C>       
1,000       $37.63       2007         5,000       $56.25    2005-2006    6,000       $46.25    2005
7,700       $37.88       1999-2007    3,500       $59.50    2005-2006      
6,000       $42.38       2007         22,500      $63.75    2005-2006 
3,000       $42.72       2007        286,500      $65.75    2005-2006

</TABLE>


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.



                                                       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               0.24          0.18              0.28             0.32
Earnings per common 
 share-basic            0.25          0.18              0.28             0.32


                    March 31,      June 30,       September 30,     December 31,
                     1996             1996             1996            1996

Net sales             $54,544      $63,305            $62,635         $69,637
Gross profit           25,734       29,960             29,419          35,054
Income from
 operations            12,975       15,802             14,963          17,472
Net Income              8,623       10,340              9,406          11,451
Earnings per common
 share assuming
 dilution                0.22         0.26               0.24            0.29
Earnings per common
 share - basic           0.22         0.27               0.24            0.30

<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 two fiscal years ended December 31,
1997 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 27, 1998. 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) or 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, 1997 and 1996

                        Statements of Income for the years ended December 31,
                        1997, 1996 and 1995

                        Statements of  Changes in  Stockholders'  Equity for the
                        years ended December 31, 1997, 1996 and 1995.

                        Statements of Cash  Flows for the years  ended  December
                        31, 1997, 1996 and 1995.

                        Notes to Financial Statements

         2.     Financial Statement Schedules
          
                Schedule II  -  Valuation of 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  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 Coopers & Lybrand L.L.P.

        *24     Powers of Attorney

        *27     Financial Data Schedule for current period and restated
                Financial Data Schedules for other periods.

      (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, 1998.

                                           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, 1998.

        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

 O. Gene Gabbard*                           Director
 O. Gene  Gabbard

 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>
                                  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  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 Coopers & Lybrand L.L.P.

*24   Powers of Attorney 

*27   Financial Data Schedule for current period and restated Financial Data
      Schedules for other periods.
   



*Filed herewith

                                 

<PAGE>

REPORT OF INDEPENDENT ACCOUNTANTS


To  the Board of Directors
ADTRAN, Inc.

Our report on the financial statements of ADTRAN, Inc.has been included on page
25 of this Form 10-K. In connection with our audits of such financial
statements we have also audited the related financial statement schedule 
included on page 44 of this Form 10-K.

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




/s/ Coopers & Lybrand L.L.P.
COOPERS & LYBRAND L.L.P.
Birmingham, Alabama
January 13, 1998

<PAGE>
          
                                         SCHEDULE II
                              VALUATION AND QUALIFYING ACCOUNTS


<TABLE>
<CAPTION>

                                         Balance at                                            Balance
                                        Beginning of                                          at end of
                                         Period             Additions      Deductions          Period


Year ended December 31, 1997
<S>                                   <C>                  <C>             <C>              <C>   
                              
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           

Year ended December 31, 1995
Allowance for Doubtful Accounts       $  450,000          $  178,952        $ 84,426         $  544,526
Inventory Reserve                     $  497,825          $  162,326                         $  660,151      
Warranty Liability                    $  280,806          $  242,221                         $  523,027

</TABLE>


                              Consent of Independent Accountants

We consent to the incorporation by reference in the registration statement of
ADTRAN, Inc. on Form S-8 of our reports dated January 13, 1998, on our audits of
the financial statements and financial statement schedule of ADTRAN, Inc. as of
December 31, 1997 and 1996, and for the years ended December 31, 1997, 1996 and
1995, which reports are incorporated by reference in this annual report on Form
10-K.


/s/ Coopers & Lybrand L.L.P.
    Coopers & Lybrand L.L.P.
    Birmingham, Alabama
    March 30, 1998



                          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, 1997, 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 14th day of January, 1998.

                                           /s/ Lonnie S. McMillian 
                                               Lonnies S. McMillian


                                  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, 1997, 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 26th day of January, 1998.
                                        /s/ Roy J. Nichols
                                            Roy J.Nichols 

                                    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, 1997, 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 21th day of  January,  1998.
                                               /s/ William L. Marks
                                                   William L. Marks
                                           
                                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, 1997, 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 23th day of January, 1998.

                                                     /s/ Mark C. Smith
                                                         Mark C. Smith



                                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, 1997, 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 22th day of January, 1998.
                                                     /s/ Howard A. Thrailkill
                                                         Howard A. Thrailkill


                                  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, 1997, 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 21th day of January, 1998.

                                                     /s/ John R. Cooper
                                                         John R. Cooper


                                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, 1997, 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 21th day of January, 1998.

                                                     /s/ O. Gene Gabbard
                                                         O. Gene Gabbard

                               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, 1997, 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 21th day of January, 1998.

                                                     /s/ James L. North
                                                         James L. North


<TABLE> <S> <C>

<ARTICLE>                     5
       
<LEGEND>
This schedule contains summary financial information extracted from the 
condensed statement of income for the year ended December 31, 1997 and the
condensed balance sheet as of December 31, 1997 and is qualifed in its entirety
by reference to such financial statements.
</LEGEND>
<CIK>                           0000926282                     
<NAME>                          ADTRAN, Inc.
<MULTIPLIER>                    1
<CURRENCY>                      US Dollar
<S>                             <C>
<PERIOD-TYPE>                   12-MOS  
<FISCAL-YEAR-END>               Dec-31-1997
<PERIOD-START>                  Jan-01-1997
<PERIOD-END>                    Dec-31-1997
<EXCHANGE-RATE>                 1
<CASH>                          45,340,961
<SECURITIES>                    37,833,240
<RECEIVABLES>                    1,250,350
<ALLOWANCES>                      (893,389)
<INVENTORY>                      39,369,103
<CURRENT-ASSETS>                167,400,078
<PP&E>                           85,701,404
<DEPRECIATION>                  (20,900,272)
<TOTAL-ASSETS>                  282,401,210
<CURRENT-LIABILITIES>            18,216,500
<BONDS>                          50,000,000
                     0
                               0
<COMMON>                            393,813
<OTHER-SE>                      212,037,075
<TOTAL-LIABILITY-AND-EQUITY>    282,401,210
<SALES>                         265,334,768
<TOTAL-REVENUES>                265,334,768
<CGS>                           130,253,531
<TOTAL-COSTS>                   130,253,531
<OTHER-EXPENSES>                 44,973,175
<LOSS-PROVISION>                          0
<INTEREST-EXPENSE>                1,838,814
<INCOME-PRETAX>                  62,826,828
<INCOME-TAX>                     22,617,556
<INCOME-CONTINUING>              40,209,272
<DISCONTINUED>                            0
<EXTRAORDINARY>                           0
<CHANGES>                                 0
<NET-INCOME>                     40,209,272
<EPS-PRIMARY>                          1.03
<EPS-DILUTED>                          1.02
        

</TABLE>

<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>
RESTATED FINANCIAL DATA SCHEDULE
This schedule contains summary financinal information extracted from the
condensed statement of income for the year ended December 31, 1996 and the
condensed balance sheet as of December 31, 1996 and is qualified in its
entirety by reference to such financial statements.
</LEGEND>
<CIK>                                       0000926282
<NAME>                                      ADTRAN, Inc.
<MULTIPLIER>                                1
<CURRENCY>                                  US DOLLAR
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>               DEC-31-1996            
<PERIOD-START>                  JAN-01-1996    
<PERIOD-END>                    DEC-31-1996    
<EXCHANGE-RATE>                          1    
<CASH>                          44,839,131              
<SECURITIES>                    32,555,930     
<RECEIVABLES>                   34,698,284     
<ALLOWANCES>                      (872,724)     
<INVENTORY>                     40,792,646    
<CURRENT-ASSETS>               156,235,933     
<PP&E>                          67,608,220     
<DEPRECIATION>                 (13,637,007)             
<TOTAL-ASSETS>                 210,207,146    
<CURRENT-LIABILITIES>           15,726,131     
<BONDS>                         20,000,000     
                    0      
                              0      
<COMMON>                           387,695    
<OTHER-SE>                     172,491,204      
<TOTAL-LIABILITY-AND-EQUITY>   210,107,146     
<SALES>                        250,120,836     
<TOTAL-REVENUES>               250,120,836     
<CGS>                          129,953,371     
<TOTAL-COSTS>                  129,953,371     
<OTHER-EXPENSES>                34,308,436     
<LOSS-PROVISION>                   430,637
<INTEREST-EXPENSE>                (894,657)   
<INCOME-PRETAX>                 63,501,796   
<INCOME-TAX>                    23,681,892     
<INCOME-CONTINUING>             39,819,904     
<DISCONTINUED>                           0     
<EXTRAORDINARY>                          0      
<CHANGES>                                0      
<NET-INCOME>                    39,819,904     
<EPS-PRIMARY>                         1.01     
<EPS-DILUTED>                         1.01     
        

</TABLE>

<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>
RESTATED FINANCIAL DATA SCHEDULE
This schedule contains summary financinal information extracted from the
condensed statement of income for the year ended December 31, 1995 and the
condensed balance sheet as of December 31, 1995 and is qualified in its
entirety by reference to such financial statements.    
</LEGEND>
<CIK>                           0000926282                        
<NAME>                          ADTRAN, Inc.
<MULTIPLIER>                    1 
<CURRENCY>                      US DOLLAR            
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>               DEC-31-1995               
<PERIOD-START>                  JAN-01-1995    
<PERIOD-END>                    DEC-31-1995    
<EXCHANGE-RATE>                           1    
<CASH>                           35,027,609    
<SECURITIES>                     24,652,689              
<RECEIVABLES>                    30,092,106    
<ALLOWANCES>                        544,526    
<INVENTORY>                      44,997,195    
<CURRENT-ASSETS>                136,522,054    
<PP&E>                           29,245,252    
<DEPRECIATION>                            0    
<TOTAL-ASSETS>                  165,767,306               
<CURRENT-LIABILITIES>            14,056,329    
<BONDS>                          20,000,000    
                     0    
                               0     
<COMMON>                            374,623    
<OTHER-SE>                      130,368,688 
<TOTAL-LIABILITY-AND-EQUITY>    165,767,306    
<SALES>                         181,478,065    
<TOTAL-REVENUES>                181,478,065    
<CGS>                            93,006,672    
<TOTAL-COSTS>                    93,006,672    
<OTHER-EXPENSES>                 27,259,610    
<LOSS-PROVISION>                          0    
<INTEREST-EXPENSE>                1,105,156    
<INCOME-PRETAX>                  44,291,291    
<INCOME-TAX>                     14,833,564    
<INCOME-CONTINUING>              29,457,727    
<DISCONTINUED>                            0    
<EXTRAORDINARY>                           0    
<CHANGES>                                 0    
<NET-INCOME>                     29,457,727    
<EPS-PRIMARY>                          0.32    
<EPS-DILUTED>                          0.32    
        


</TABLE>


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