copyright AT&T 1992

Solidly-built, solidly-backed by AT&T!

NEW! ALL-IN-ONE, HIGH-SPEED AT&T DATAPORT  FAX MODEMS

Featuring the AT&T DataPort 14.4/Fax Modem.  AT&T's family of
all-in-one DataPort fax modems meets your complete business and
personal dial-up needs. Powerful and robust, DataPort fax modems
pay for themselves by significantly reducing your long distance
phone costs. Assuring the industry's widest range of
compatibility, backed by AT&T with a limited lifetime warranty
and helpful, toll-free service and support.
 
For IBM PC/AT/XTs and Macintosh, choose from 5 models to exactly
meet your price/performance and feature/function needs.



                    THE  VALUE-PACKED DATAPORT FAMILY

Features             14.4/Fax        9.6/Fax         14.4
V.32bis
  (14,400 bps)          Yes            ---            Yes
V.32-103J
  (9,600 to 300 bps)    Yes            Yes            Yes
V.42bis  (data
  compression, MNP5)    Yes            Yes            Yes
Optical phone Line
  Interface (OLI)
  patent pending        Yes            Yes            Yes
16550A buffered
  UART port
 (PC-internal card)     Yes            Yes            ---
Fax line rate
 compatability
 (bps):              9,600 to       9,600 to          ---
                       2,400          2,400
Effective throughput,
    up to (bps):      57,600         38,400         57,600
Lifetime Warranty       Yes            Yes            ---

Models:
    External            Yes            Yes            Yes
    Internal            Yes            Yes            ---


AMAZING SPEED!
The DataPort family of high-speed fax modems delivers the highest
performance in the industry--tested and proven the leader in
connecting calls, even on noisy, impaired lines. Here's how.

The DataPort family features AT&T's new, exclusive Optical phone
Line Interface (OLI), patent pending, an optical coupler between
the phone line and modem that outperforms conventional
transformer-based technology.

Modem couplers serve to protect the modem's circuitry. However,
traditional transformer-based couplers normally add some noise to
the data stream. On bad lines, when noise starts to overpower
your data, this additional distortion can cause the modem to fall
back in speed and fail to perform.  In contrast, AT&T's advanced
Optical phone  Line Interface limits distortion, sustains the
signal quality, and maintains higher speeds--even on weak "real
world" phone lines.

By maintaining higher speeds, and by using data compression
(V.42bis) and error correction (V.42), the DataPort 14.4/Fax
Modem gives you effective throughput of up to 57,600 bps across
ordinary phone lines. That's 4 times faster than lesser 14,400
bps modems and 24 times faster than 2,400 bps modems!

REMARKABLE VALUE!
Faster transmission means lower line costs. Simply put, the
DataPort 14.4/Fax Modem can save you enough in long distance
costs to pay for itself in less than six months. After that, your
monthly long distance savings puts money in your pocket! Look at
how quickly it pays you back. (See illustration below.)

Based on sending 1 Megabyte of data per week at a long distance
phone line cost of 20 a minute, a 2,400 bps modem takes 70
minutes to transfer data, while the DataPort 14.4/Fax Modem takes
only 4.2 minutes; assumes an average throughput of 40,000 bps;
maximum throughput up to 57,600 bps.

The DataPort 9.6/Fax Modem delivers comparable savings at 9,600
bps. Both models expand your personal computer into a fax
workstation--for the price of fax machine alone! You only need--
and pay for--one phone line for both modem and fax.


               ALL-IN-ONE DATAPORT FAX MODEMS

     Send/receive text, data, and images
     Link PCs to PCs, fax machines, and mainframes
     Connect remote offices and homes to corporate headquarters
     Transfer data files
     Exchange images with fax machines
     Dial into E-mail, bulletin boards, and information services 

Your productivity improves, too, so figure in your time-savings.
There's no more waiting for your screen to refresh.  The all-in-
one high-speed DataPort fax modems:

     Come pre-configured, ready to use; easy to operate
     Save time waiting in line to send faxes
     Allow you to send presentation-quality faxes, and
     Receive faxes even if you've been working on your PC!

The DataPort family is a good value in other ways, too. You get
FREE, powerful yet friendly QuickLink II communications/fax
software for DOS and Windows. And you get a FREE CompuServe
bonus, a $22.95 value. Available soon with software  support for 
the Macintosh. 

HASSLE-FREE COMPATIBILITY!
Designed by AT&T Bell Laboratories and AT&T Paradyne; tested and
proven to be compatible with virtually all modems. DataPort
modems automatically sense and adjust to the line speed of other
modems, and easily connect--even to older, slower modems.

And DataPort fax modems are compatible with standard 9,600 to
2,400 bps fax machines and fax modems (Group 3), and certified to
work with popular communications/fax software (Class 1).


UNSURPASSED AT&T RELIABILITY
The DataPort family features the same robust, award-winning
technology designed for large data centers by AT&T Bell Labs and
AT&T Paradyne.

We invented modem technology over 35 years ago. In rigorous
laboratory testing and daily use, we've demonstrated our solid
product reliability.

The DataPort builds on this excellence, and to prove it, AT&T
backs the DataPort with a lifetime warranty and toll-free service
and support.

Now you can enjoy the benefits of our experience: highest
performance, excellent value, and the industry's widest
compatibility.  Proudly made by AT&T Paradyne in the USA.
JUST ASK AT&T. WE'LL GLADLY HELP YOU.

WHICH FAX MODEM IS RIGHT FOR YOU? AT&T has the answer. Choose
from five models in the DataPort family to serve your exact
needs.

WHAT IS THE REAL-LIFE DIFFERENCE BETWEEN 14,400 AND 9,600 BPS? 
Speed really pays when you typically dial long distance to your
customers, headquarters office, information services, and
bulletin boards--especially to transfer data-intensive files and
fax images. Also, think ahead to serving your future customers
and to accessing  new databases for business or home. The high-
speed DataPort 14.4/Fax Modem runs nearly 24 times faster than
2,400 bps modems and significantly rewards you in phone line cost
savings. The DataPort 9.6/Fax Modem is ideally suited for mostly-
local fax and modem use. And it's the next best value to the
DataPort 14.4/Fax Modem.

WHAT ARE THE ADVANTAGES OF AN INTERNAL VS. EXTERNAL MODEL?  The
DataPort family's AT-bus internal card modem fits neatly inside
your PC.  It conserves desktop space and requires no additional
connector cables. Further, it discourages unwanted access when
you're not around.

On the other hand, an external modem frees space inside your PC
and facilitates sharing the DataPort fax modem with PCs near your
desk. And it can easily serve double-duty for office and home.

HOW IMPORTANT IS COMPATIBILITY?  Very important, especially with
today's varying modems, speeds, and standards.  If you can't
easily connect to new online services, BBSs, customers and
prospects,  it's frustrating and embarrassing. Moreover  lengthy
re-trying increases your long distance costs.  DataPort fax
modems will sense and adjust to slower speeds and connect easily,
even to older modems. You gain the highest compatibility in the
industry.

HOW DOES THE FAX WORK?  DataPort fax modems let you transmit fax
images directly to and from fax machines and fax modems, without
the expense of a separate fax machine.

And because you send faxes directly from your desktop computer,
the receiving fax machine can print presentation-quality images
without getting that "faxed" look. You can print faxes on your
laser printer and save the cost and inconvenience of stocking fax
paper.

WHAT IF I DON'T NEED FAX CAPABILITY?  If you really think you'll
never miss having an all-in-one fax and modem, then choose the
DataPort 14.4 Modem. It gives you high-speed 14,400 bps
performance, compatibility, and reliability--backed by AT&T!
EXCITING DATAPORT FAMILY HIGH-SPEED FAX MODEMS.
     
     Highest Performance.  Through AT&T's Optical phone Line
     Interface (OLI), pat. pending, and using V.42bis data
     compression and V.42 error correction, the DataPort family
     of fax modems connects more easily and maintains high speeds
     and data integrity, even on noisy, impaired lines. Achieves
     an effective throughput of up to 38,400 and 57,600 bps.

     Excellent Value.  Faster transmission means lower long
     distance phone costs. Improves productivity, saves time.
     FREE communications/fax software for DOS  and Windows
     included. Also ask about software support for the Macintosh.

     Industry's Widest Compatibility.  DataPort fax modems sense
     and adjust to the line speed of other modems; connect to
     high-speed modems and all speeds down to 300 bps.

     AT&T Commitment.  Reliability backed by AT&T's lifetime
     warranty and helpful, toll-free support.

DataPort 14.4/Fax Modem (V.32bis)
     Standalone, suggested retail, $555
     PC/AT-internal card, suggested retail, $505

DataPort 9.6/Fax Modem (V.32)
     Standalone, suggested retail, $445
     PC/AT-internal card, suggested retail, $415

DataPort 14.4 Modem (V.32bis)  standalone, suggested retail $515

Included with your DataPort family product: User's manual, phone
cord; lifetime warranty, toll-free technical support, FREE
QuickLink II software for DOS and Windows, and FREE CompuServe
bonus ($22.95 value).

          Begin saving on your long distance costs today!

SPECIFICATIONS

CCITT
     14.4 models--V.32bis, V.32, V.22bis,V.22, V.21, V .23;
               Bell 212A, Bell 103J
     9.6 models--V.32, V.22bis, V.22, V.21, V .23; Bell 212A,
               Bell 103J

FAX ( Fax models only)
     V.29, V.27ter (Group 3)
     PC FAX EIA/TIA-578
     Class 1 compatible

LINE DATA RATES
     14.4 models--14,400 bps to 300 bps
     9.6 models--9,600 to 300 bps

LINE FAX RATES: 9,600, 7,200, 4,800, and 2,400 bps

DATA COMPRESSION: CCITT V.42bis or MNP 5

ERROR CORRECTION: CCITT V.42 or MNP 4-2

AUTORATE: 14,400 12,000, 9,600, 7,200, 4,800 bps (V.32bis)

FALL BACK/FORWARD: 9,600 and 4,800 (V.32)

DTE RATES:  To 57,600 (14.4 models), To 38,400 bps (9.6 models)

COMMAND SET: HAYES AT

FRONT PANEL INDICATORS, External models:     EC, HS, CD, OH, RD,
                                             SD, TR, MR

TELEPHONE INTERFACE: Dial line, RJ11C permissive

DTE INTERFACE: EIA/TIA 232E; CCITT V.24, V.28

COMM PORT: COM 1-4, 16550A buffered UART (or compatible)

DIMENSIONS
     External models  
          Size:     6.0 in (15.0 cm) W, 1.25 in (3.0 cm)
                    H, 8.75 in (22.0) D
          Weight:   1.3 lbs (.59 Kg)
     Internal models
          Size:     0.9 in (2.3 cm) W, 4.78in (12.1 cm)
                    H, 6.08 in (15.4 cm) D
          Weight:   4.0 oz. (113.36 g)
POWER: External models, 5.37 watts

CERTIFICATION: DOC 230 4982 A LOAD #7 (External); 230 4980 A LOAD
#6 (Internal) ; CSA 22.2 No. 950; UL LISTED 1950; FCC Part 15,
Class B; FCC Part 68, AW2USA-73706-FA-E (External), AW2USA-73812-
FA-E (Internal)
UL logo


                                                                 

      











copyright AT&T 1992

DATAPORT is a trademark of AT&T. All other products or services
mentioned are the trademarks, service marks, registered
trademarks, or registered service marks of their respective
owners. Lifetime warranty is limited and applies to original
purchaser only.

Printed in the U.S.A.  

AT&T Paradyne
8545 126th Avenue North
Largo, Florida 34649

For more information on the DataPort modems, call:
     1 800 554-4996

For information on the Sysop Pricing Program, please write to:
     Scott Frazee
     AT&T Paradyne
     8545 126th Avenue North
     P.O. Box 2826
     Largo, Florida  34649-2826

or Fax your Sysop Pricing Program request to:
     (813) 530-2398

Please remember to include a return address with your request.
                      Optical phone Line Interface

The Optical Line Interface has two major design and performance 
advantages over the transformer-based line interface circuits
used in other V.32bis modems.  

First, the Optical Line Interface has a more resistive impedance 
which allows it to attain a much more consistent "match" to the 
impedance of the telephone network, reducing both the amount of 
near-end echo for the AT&T DataPort modem and the far-end 
echo for any remote modem.  As a result, other modems are able 
to perform more reliably when they connect to the DataPort 
modems than when they connect to modems with traditional 
transformer-based designs.  

Second, when the Optical Line Interface is used to transmit and 
receive signals, the addition of harmonic distortion products to
the signals is greatly reduced.  Since harmonic distortion can
adversely affect the transmitted signal and the near-end echo
signal, the performance of the DataPort modem and the remote
modem are both improved as a result.

When a V.32bis modem's near-end echo signal includes these 
harmonic distortion products, its near echo canceler is unable to
compensate for them and they pass through to the receiver as 
noise.  Even worse, these distortion products may be boosted by 
the modem's equalizer circuit as it tries to compensate for the 
signal attenuation which occurs in the network.  When the 
presence of these unwanted signals begins to affect the modem's 
ability to accurately interpret the receive data stream, errors
will result.

Since the Optical Line Interface reduces both the near-end echo 
level and the injection of harmonic distortion products, The 
DataPort modem is able to send data more reliably under a wider 
variety of network conditions.  When you also consider the 
reduction in far-end echo and  harmonic distortion for the remote
modem, the benefits of the Optical Line Interface are hard to 
ignore.


For those persons who want a more in-depth understanding of why 
the above is true, please read on....  

Dial modems connect to the tip/ring interface of the PSTN through
a "line interface circuit".  The function of this circuit is to
isolate the higher power signals which are carried across the
copper wires and transfer only the lower voltage levels to an
Analog/Digital converter and input to the Digital Signal
Processor or "data pump".  

The impedance presented by the line interface circuit at the
various signal frequencies transmitted and received through it
will affect the " impedance match" of the modem to the network. 
When the impedance of the modem and the impedance of the network
are the same, 100% of the modem's transmit signal energy is
transferred into the network and none is reflected.

When an impedance mismatch exists, however, signal reflections 
occur at the modem-to-network interface.  These reflections
result in "near-end echo", which is an unwanted signal that must
be removed from the receive data stream by the modem's echo 
canceler.  The presence of near end echo will cause data errors
in a V.32bis modem if the echo canceler cannot accurately
eliminate it.

In the ideal case, the impedance of the line connected to the 
modem would be constant regardless of how far the modem is 
located from the Telephone Central Office Switch.  In this ideal 
case, all modems could be designed to match the network  
impedance perfectly and no signal reflections would occur.  
Unfortunately, the impedance characteristics of the copper wire 
connecting your local phone jack to the Central Office (known as 
the "local loop") is one of the most widely varying aspects of
the telephone network.  Although the local loop remains constant
from one call to the next, the local loop characteristics vary at
each endpoint due to factors such as the distance from the
Central Office, the gauge of the copper wire and the existence of
loading coils on the loop.  As such, a modem designed to
interface well with very short, unloaded loops may not work well
if it is connected through long, loaded loops, and vice-versa.  

Due to the electrical properties of reactive components such as 
capacitors and inductors, the sensitivity of a transformer-based 
coupling circuit to variations in the network impedance is much 
greater than that of a purely resistive circuit.  The amount of
near-end echo is directly related to the impedance mismatch
between the modem and the network.  When a transformer-based
line-interface circuit is designed into a modem, that modem's
near echo signal will vary dramatically as it is connected to the
various types of local loops which are present in the network.  
If a modem's line interface were designed with a purely resistive
output impedance, that modem's near-end echo signal would remain
much more consistent as it was connected to a wide variety of
local loop conditions.  The Optical Line Interface is one such
design, and it allows the DataPort modems to achieve significant
performance benefits as a result.
Even more importantly, the same impedance mismatch which 
creates a near-end echo for the local modem will cause a far-end 
echo for the remote modem.  The far-end echo signal is that 
portion of the remote modem's transmit signal which travels
across the network to the local modem, then gets reflected back
again to the remote modem.  The far-end echo signal is delayed by
the round-trip delay present in the network, and it includes all
of the impairments which were introduced by a round trip through
the network.  As such, the far-end echo signal is quite complex
and requires sophisticated techniques for accurate cancellation. 
By reducing the impedance mismatch between the local modem and 
the network, the Optical Line Interface can reduce the remote 
modem's far-end echo signal and improve its performance.

A second negative aspect of transformer-based line interface 
circuits is the harmonic distortion  which is introduced by the 
transformer itself.  The amount of harmonic distortion introduced
by low-cost (and typically small in size) transformers may be 
considerably worse than the distortion introduced by higher cost 
(and typical larger) transformers, so the designer's selection of
a transformer is a cost versus performance trade-off.  

The harmonic distortion which is introduced by the transformer 
affects all signals which pass through it, both transmitted and 
received.  Since harmonic distortion is non-linear in nature, it 
cannot be compensated for by the modem.  Therefore, the modem 
interprets harmonic distortion signals as noise, potentially
causing data errors.  The amount of harmonic distortion
introduced for the higher level transmit and near-echo signals is
much larger than for the lower level receive signals -- it is a
non-linear relationship.  Consequently, the transmit signals and
the near-echo signals are most affected by the introduction of
harmonic distortion in a line interface circuit, so both the
local and remote modems benefit when the amount of harmonic
distortion is reduced.

The less-reactive characteristics of the Optical Line Interface 
design reduce its harmonic distortion, which allows it to 
consistently outperform transformer-based designs.



AT&T PARADYNE - SYSOP PRICING PROGRAM

Please return the completed order form to:

                    AT&T Paradyne
                    c/o Scott Frazee
                    Sysop Pricing Program
                    8545 126th Avenue North
                    P.O. Box 2826 
                    Largo, FL  34649-2826

                    Fax: (813) 530-2398
 

Name of Sysop: __________________________________________________

Company: ________________________________________________________

Business Address: _______________________________________________

_________________________________________________________________

Business City, State, Zip Code:__________________________________

_________________________________________________________________

Business (Voice) Phone Number: __________________________________




Shipping Address (if different from above): _____________________

_________________________________________________________________

Shipping City, State, Zip Code: _________________________________

_________________________________________________________________

Home (Voice) Phone Number: ______________________________________




Name of Bulletin Board: _________________________________________

Bulletin Board Phone Number(s): _________________________________

_________________________________________________________________

_________________________________________________________________

Which BBS software package is being used: _______________________

What type of modem (manufacturer and brand) is currently being 

used: ___________________________________________________________

_________________________________________________________________

How long has the BBS been running: ______________________________

Please leave the current number of active callers and the average

calls per week received by your system: _________________________

_________________________________________________________________

_________________________________________________________________

Is the BBS tied into a Net?  If "Yes", which Net(Fido, WWIV, 

RIME, etc.): ____________________________________________________

What is the BBS' Main Focus (File Exchange, Message Base, 

E-mail, etc.): __________________________________________________

_________________________________________________________________

Is this a Non-profit or Commercial BBS (if Commercial, please 

include your fee breakdown): ____________________________________

_________________________________________________________________

When is the BBS in operation: ___________________________________

_________________________________________________________________








To verify the preceding information, AT&T Paradyne MUST be
provided with a login and password.

AT&T Paradyne Login: ____________________________________________

AT&T Paradyne Password: _________________________________________

If you would like for AT&T Paradyne to send additional literature
to an affiliate and/or user group, please leave their information
below.
                                 

Name: ___________________________________________________________

Attention: ______________________________________________________

Address: ________________________________________________________

City, State, Zip Code: __________________________________________

Voice Phone Number: _____________________________________________

Data Number: ____________________________________________________

AT&T Paradyne is proud to offer three different DataPort modems
under the Sysop Pricing Program.  These modems are:

                                                      
                              FEATURE        LIST      SYSOP
MODEL                         NUMBER         PRICE     PRICE
DataPort 14.4/Fax Ext.        3710-A1-201    $555      $222
DataPort 14.4/Fax Int.        3721-B1-001    $505      $202
DataPort 14.4     Ext.        3710-A1-211    $515      $206

Ext. = External Modem         Int. = Internal Modem


   YES! I would like to order the following DataPort products.

                    FEATURE   
QTY.                NUMBER                        SUBTOTAL

_________________________________________________________________
 
_________________________________________________________________
 
_________________________________________________________________
 
_________________________________________________________________

_________________________________________________________________

                                          Subtotal:      ________
 
All Customers must add-in their applicable sales tax:    ________
 
       I prefer the modem be shipped by UPS (add $5):    ________

I prefer the modem be shipped by FedEx-2 day(add $15):   ________

                               Total Cost of Order:   ___________

NOTE:     Sales Tax information must be filled in.  If you are
          exempt from sales tax, a copy of your exemption
          certificate needs to be included with you order.
      



Enclosed, please find my payment of $_____________ in the
form of:
                                
          Money Order ( )          Mastercard ( )
          Visa ( )                 American Express ( )


If paying by credit card, the following MUST be completed:
 
Credit Card Number: _____________________________________________

Expiration Date: ________________________________________________
 
Signature as it appears on the card:_____________________________





Please recognize that this is a discount offer applicable to
qualified sysops only and may be terminated and/or altered at
AT&T Paradyne's discretion without any prior notification. By
signing below, the Sysop acknowledges and agrees to the attached
Qualifications.




Sysop's Signature                  Dated: _______________, 19____

________________________________   AT&T Paradyne

By: ____________________________   By: __________________________
     (Please Print Your Name)



Qualifications:

1.   The Sysop has been continuously operating a functional
     computer bulletin board for the past 6 months.  The Sysop
     further agrees to maintain the on-line bulletin board for 6
     months after the sale of the DataPort modems purchased
     under the Sysop Pricing Program.

2.   The Sysop agrees to include an appropriate login notice in a
     visible and conspicuous place, stating that his/her system
     is being run off of an AT&T Paradyne DataPort brand modem.

3.   The Sysop understands that the number of modems available
     for purchase under this program is limited only by the
     number of lines that the bulletin board is currently making
     use of.  For multiple line/node services, the data lines/
     nodes must be verifiable.

4.   The Sysop understands that his/her order will be shipped
     within 3 to 4 weeks upon being verified as a Sysop.  The
     verification process includes the return of this order form
     to AT&T Paradyne by Sysop and a check by AT&T Paradyne to
     ensure that the Sysop's computer bulletin board is
     operational.  AT&T Paradyne reserves the right to refuse
     those who do not qualify as a true Sysop.
