ZyXEL Communications Omni TA128 User manual

Omni TA128
User’s Manual
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Foreword
ii
ZyXEL Limited Warranty
ZyXEL warrants to the original end user (purchaser) that this product is free from any
defects in materials or workmanship for a period of up to two (2) years from the date of
purchase. During the warranty period, and upon proof of purchase, should the product
have indications of failure due to faulty workmanship and/or materials, ZyXEL will, at its
option, repair or replace the defective products or components without charge for either
parts or labor, and to whatever extent it shall deem necessary to restore the product or
components to proper operating condition. Any replacement will consist of a new or
remanufactured functionally equivalent product of equal value, and will be solely at the
option of ZyXEL. This warranty shall not apply if the product is modified, misused,
tampered with, damaged by an act of God, or subjected to abnormal working conditions.
Note: Repair or replacement, as provided under this warranty, is the exclusive remedy of
the purchaser. This warranty is in lieu of all other warranties, express or implied, including
any implied warranty of merchantability or fitness for a particular use or purpose. ZyXEL
shall in no event be held liable for indirect or consequential damages of any kind or
character to the purchaser.
To obtain the services of this warranty, please contact ZyXEL’s Service Center, refer to
the separate Warranty Card for your Return Material Authorization number (RMA).
Products must be returned Postage Prepaid. It is recommended that the unit be insured
when shipped. Any returned products without proof of purchase or those with an out-
dated warranty will be repaired or replaced (at the option of ZyXEL) and the customer
will be billed for parts and labor. All repaired or replaced products will be shipped by
ZyXEL to the corresponding return address, Postage Paid (USA and territories only). If
the customer desires some other return destination beyond U.S. borders, the customer
shall bear the cost of the return shipment. This warranty gives you specific legal rights,
and you may also have other rights which vary from state to state.
Copyright © 1996 by ZyXEL
The contents of this book may not be reproduced (in any part or as a whole) or
transmitted in any form or by any means without the written permission of the publisher.
Published by ZyXEL Communications, Inc. All rights reserved.
Notice: ZyXEL does not assume any liability arising out of the application or use of any
products, or software described herein. Neither does it convey any license under its patent
rights nor the patents rights of others. ZyXEL further reserves the right to make changes
in any products described herein without notice. This document is subject to change
without notice.
Acknowledgments
Trademarks and brands mentioned in this manual are used for plain informational
purposes. All trademarks and brands remain the properties of their respective owners.

Foreword
iii
FCC Part 15 Information
This device complies with Part 15 of FCC rules. Operation is subject to the following two
conditions:
1) This device may not cause harmful interference.
2) This device must accept any interference received, including interference that may
cause undesired operations.
This equipment has been tested and found to comply with the limits for a CLASS B
digital device pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses, and can radiate radio frequency energy, and if not installed
and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a
particular installation.
If this equipment does cause harmful interference to radio/television reception, which can
be determined by turning the equipment off and on, the user is encouraged to try to
correct the interference by one or more of the following measures:
 Reorient or relocate the receiving antenna.
 Increase the separation between the equipment and the receiver.
 Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
 Consult the dealer or an experienced radio/TV technician for help.
Changes or modifications not expressly approved by the party responsible for compliance
could void the user’s authority to operate the equipment. Shielded RS-232 cables are
required to be use
d to ensure compliance with FCC Part 15, and it is the responsibility of the user to
provide and use shielded RS-232 cables.
Omni TA128; FCC ID# i88OMNITA128U

Foreword
iv
Information for Canadian Users
The Industry Canada (IC, formerly DOC) label identifies certified equipment. This
certification means that the equipment meets certain telecommunications network
protective, operational, and safety requirements. IC does not guarantee that the
equipment will operate to a user’s satisfaction.
Before installing this equipment, users should ensure that it is permissible to be connected
to the facilities of the local telecommunications company. The equipment must also be
installed using an acceptable method of connection. In some cases, the company’s inside
wiring associated with a single line individual service may be extended by means of a
certified connector assembly (telephone extension cord). The customer should be aware
that the compliance with the above conditions may not prevent degradation of service in
some situations.
Repairs to certified equipment should be made by an authorized Canadian maintenance
facility designated by the supplier. Any repairs or alterations made by the user to this
equipment, or equipment malfunctions, may give the telecommunications company cause
to request the user to disconnect the equipment.
For their own protection, users should ensure that the electrical ground connections of the
power utility, telephone lines, and internal metallic water pipe system, if present, are
connected together. This precaution may be particularly important in rural areas.
Caution: Users should not attempt to make such connections themselves, but
should contact the appropriate electrical inspection authority, or
electrician, as appropriate.
The Load Number (LN) assigned to each terminal device denotes the percentage of the
total load to be connected to the telephone loop used by the device without overloading.
The termination on a loop may consist of any combination of devices, subject only to the
requirement that the total of the Load Numbers of all the devices not exceed 100.
This digital apparatus does not exceed the class B limits for radio noise emissions from
digital apparatus set out in the radio interference regulations of Industry Canada (formerly
Canadian DOC).

Table of Contents
Table of Contents
Foreword.......................................................................... ii
ZyXEL Limited Warranty.................................................................................ii
Copyright © 1996 by ZyXEL ............................................................................ii
Acknowledgments............................................................................................ii
FCC Part 15 Information................................................................................iii
Information for Canadian Users.......................................................................iv
Chapter 1 - Introduction................................................1-1
Key Features of the Omni TA128 .......................................................................1-1
U-Interface Option........................................................................................1-3
Unpacking Your Omni TA128............................................................................1-3
How to Become a Registered Owner...................................................................1-3
Chapter 2 - Installing your Omni TA128........................2-1
Connecting Your Omni TA128 to the Power Supply.............................................2-1
Connecting the Omni TA128 to Your Computer...................................................2-2
Connecting the Omni TA128 to Your ISDN Line .................................................2-3
S/T Interface Model.......................................................................................2-3
U Interface Model .........................................................................................2-4
Power On and Self Diagnostics...........................................................................2-4
Omni TA128 Front Panel...................................................................................2-5
The LED Indicators.......................................................................................2-5
Front Panel Switch........................................................................................2-6
Understanding AT Commands............................................................................2-6
Supported AT command types:........................................................................2-7
Quick Tips when issuing AT commands:.........................................................2-7
Chapter 3 - Configuring Your ISDN Line and Network.3-1
ZyXEL Configuration Manager Software.............................................................3-1
Configuring your Modem using a Terminal program..............................................3-2
Getting a Terminal Program Ready................................................................3-2
Configuring Your ISDN Line Switch Type and SPID............................................3-3
Switch Type Configuration.............................................................................3-3
SPID Setup ...................................................................................................3-4
Testing your Connection................................................................................3-5
Making Your First ISDN Data Connection...........................................................3-6

Table of Contents
Chapter 4 - ISDN Communication Basics .....................4-1
Outgoing Calls...................................................................................................4-1
Dialing out using ISDN mode ........................................................................4-1
Dialing out using ISDN mode optional Speech Bearer Service.........................4-1
Dialing out for Analog Adapter Port 1............................................................4-2
Manually switching communication modes .....................................................4-2
Placing the Call............................................................................................4-2
Incoming Calls...................................................................................................4-2
Answering a Call using MSN .........................................................................4-5
Data over Speech Channel.............................................................................4-5
Best-effort call answering ..............................................................................4-6
Ambiguity resolution switch for voice calls.....................................................4-6
Multi auto-answering of data calls .................................................................4-6
Chapter 5 - Setup for Windows 95 and NT....................5-1
Installing the Windows 95 Driver (INF file)..........................................................5-1
Configuring Windows 95 Dial-Up Networking......................................................5-3
Windows NT RAS Setup....................................................................................5-7
Chapter 6 - Async to Sync PPP and SLIP.....................6-1
Internet and Remote Access PPP and SLIP......................................................6-1
Making Async to Sync PPP and SLIP calls..........................................................6-1
Keeping a Line Connection During Idle Time.................................................6-2
Answering Async to Sync PPP calls....................................................................6-2
Multilink PPP....................................................................................................6-2
Making a call using Multilink PPP.................................................................6-3
Endpoint Discriminator.................................................................................6-3
Dynamic Bandwidth Allocation......................................................................6-4
Chapter 7 - V.120 ISDN Communications......................7-1
Placing outgoing calls .........................................................................................7-1
Answering incoming calls....................................................................................7-2
Speeds of 128Kbps............................................................................................7-2
Identifying your line provisioning..................................................................7-3
Making a Bundled Call with V.120.................................................................7-3
Dialing pre-stored phone numbers..................................................................7-4
Dynamic Bandwidth Allocation......................................................................7-4
Error Correction and Data Compression with V.120..............................................7-5
Selecting V.120 for European ISDN (DSS1) switch..............................................7-6
Selecting V.120 for Germany National ISDN (1TR6)............................................7-6
Chapter 8 - X.75 ISDN Communications .......................8-1

Table of Contents
Answering an X.75 call.......................................................................................8-1
Making an X.75 Call..........................................................................................8-2
Making a Bundled Call with X.75...................................................................8-2
Dynamic Bandwidth Allocation......................................................................8-3
Invoking V.42bis Data Compression....................................................................8-4
Data Encryption.................................................................................................8-5
Manual DES Key Generation.........................................................................8-6
Control of Data Encryption............................................................................8-8
Chapter 9 - V.110 ISDN Communications......................9-1
Answering a V.110 call.......................................................................................9-1
Making V.110 Calls............................................................................................9-2
Asynchronous V.110 Calls..............................................................................9-2
Synchronous V.110 calls................................................................................9-2
Chapter 10 - Handling Analog Calls............................10-1
Placing a Call from the Analog Adapter..............................................................10-2
Accepting an Incoming Call...............................................................................10-2
Chapter 11 - Advanced ISDN Call Control...................11-1
Call Control for DSS1 (Digital Subscriber Signaling #1).......................................11-1
Control of Outgoing Service Indicator..........................................................11-1
Control of ISDN Phone Number and Sub-address..........................................11-2
Call Control for 1TR6 (Old German ISDN)........................................................11-3
Control of Outgoing Service Indicator..........................................................11-3
Control of ENDGERÄTEAUSWAHLZIFFER (EAZ)........................................11-4
Answering a Call..............................................................................................11-5
Answering a Call for DSS1 ..........................................................................11-5
Answering a Call for 1TR6...........................................................................11-6
Best-effort Call Answering...........................................................................11-6
Ambiguity Resolution Switch for Voice Calls ................................................11-6
Multi-Auto-Answering of Data Calls.............................................................11-7
Disable inbound call connection ..................................................................11-8
Point-to-Point Configuration.......................................................................11-8
Placing a Call.................................................................................................11-10
Placing a call for DSS1 .............................................................................11-10
Placing a call for 1TR6..............................................................................11-10
User-To-User Information..............................................................................11-11
Chapter 12 - Security Functions..................................12-1
Password Security Functions ............................................................................12-1
Security Types and Levels............................................................................12-1
Setting and Modifying Passwords.................................................................12-2

Table of Contents
Non-password Auto Call Back Function.............................................................12-3
Chapter 13 - Upgrading Your Omni TA128..................13-1
Upgrading with Flash EPROM..........................................................................13-1
Chapter 14 - Usage of DTE Port 2................................14-1
Selection of the Two DTE Port Mode...............................................................14-1
Configuration of the DTE Port 2.......................................................................14-2
Basic "AT" Command Set.............................................................................14-2
Extended "AT&" Command Set.....................................................................14-4
Setting of DTE port 2 Speed.........................................................................14-5
Call Control of the DTE Port 2.........................................................................14-5
Chapter 15 - Diagnostics and Protocol Analyzer........15-1
Diagnostics......................................................................................................15-1
Power-on Self-test .......................................................................................15-1
ISDN Loopback test (AT&T9).......................................................................15-1
Loopback with Self-test (AT&T10)................................................................15-2
The Diagnostic Command (ATCG)...............................................................15-2
Resetting The Omni TA128..............................................................................15-2
Using The Embedded Protocol Analyzer............................................................15-3
Setting up the Embedded EPA......................................................................15-3
Capturing the Protocol Data........................................................................15-3
Analyzing the Captured Data .......................................................................15-4
Chapter 16 - AT Command Set Reference...................16-1
Operation Modes of the DTE Interface..............................................................16-1
Simplex mode..............................................................................................16-1
Multiplex mode ...........................................................................................16-1
AT Command Descriptions...............................................................................16-1
Basic "AT" Command Set.............................................................................16-2
Extended "AT&" Command Set.....................................................................16-7
Extended "AT*" Command Set....................................................................16-10
Chapter 17 - Status Registers and Result Codes........17-1
Viewing and Setting S-Registers ........................................................................17-1
S-Register Descriptions.....................................................................................17-3
Basic S-Registers "ATSn=x".........................................................................17-3
Extended S-Registers "ATSn=x"....................................................................17-3
"ATXn" Result Code Option Table..............................................................17-11
Result Code Field Descriptions..................................................................17-13
Connect Strings for Error Corrected Connections........................................17-14
Chapter 18 - ISDN General Reference .........................18-1

Table of Contents
Terminal Adapter.............................................................................................18-1
Basic Rate Interface (BRI)................................................................................18-1
D channel Protocol......................................................................................18-1
Rate Adaptation & B channel Protocol.........................................................18-2
Out-of-band signaling..................................................................................18-2
ISDN Basic Rate Interface Points.................................................................18-3
Chapter 19 - Ordering Your ISDN Line........................19-1
ISDN Service Ordering Information .............................................................19-1
ZyXEL ISDN Order Form - Switch: AT&T 5ESS ...........................................19-2
ZyXEL ISDN Order Form - Switch: DMS-100...............................................19-3
ZyXEL ISDN Order Form - Switch: EWSD....................................................19-4
ISDN Service Ordering Checklist ......................................................................19-5
What are SPIDs?.............................................................................................19-5
Chapter 20 - Contacting ZyXEL...................................20-1
ZyXEL Phone Numbers...................................................................................20-1
Online Access..................................................................................................20-2
Internet.......................................................................................................20-2
CompuServe................................................................................................20-2
Appendix A - Phone Jack Pinout Assignments...........A-1
RJ-45 Connector for the S/T Interface Model.................................................. A-1
RJ-45 Connector for the U Interface Model.................................................... A-1
RJ-11 Analog Adapter (Phone 1&2) .............................................................. A-1
Appendix B - Serial Port Interface................................B-1
EIA-232D 25 Pin Serial Port Interface................................................................ B-1
9 Pin Serial Port Interface..................................................................................B-1
Async. Hardware Flow Control Cable Connection ...............................................B-2
Appendix C - INDEX......................................................C-1

Chapter 1 - Introduction
1-1
Chapter 1 - Introduction
The ZyXEL’s Omni TA128 ISDN Terminal Adapter (TA) sets a new price/performance
standard for the explosively growing Internet and telecommuting applications.
When used with off-the-shelf Internet or remote access client software, the Omni TA128
enables mobile or home users to connect to the Internet or branch offices over ISDN lines
Hassle Free! The same device also allows a user to connect to the analog world via a
modem, fax machine, or telephone connected directly to the Omni TA128.
With ZyXEL’s Common Application Programming Interface for ISDN published by
Telekom Roland in Germany, a user may run most commercially available ISDN
applications with the Omni TA128.
To take advantage of constant new developments, the Omni TA128 employs flash
EPROMs, which allow for convenient uploading of newly available firmware which
preserves your hardware investment.
The Omni TA128 supports both D and B Channels protocols. For the D Channel, it
supports DSS1, 1TR6, DMS-100, AT&T Custom, and NI-1. For the B Channels, X.75
SLP, V.120, V.110, PPP Async-to-sync Conversion and Bundle (128Kbps).
ZyXEL’s expertise in data compression has been brought to the Omni TA128. With its
V.42bis compression on the B Channels using either X.75 or V.120, the Omni TA128 can
effectively communicate at speeds up to 512Kbps over ISDN lines.
The Omni TA128 also has two analog ports to connect analog devices such as fax
machines, modems, and telephones. Two different analog devices can communicate over
the two B channels to two different locations simultaneously, so you can send a fax and
make a voice call at the same time! The analog ports also recognize standard DTMF
tones as well as pulse dialing.
Key Features of the Omni TA128
Speed and Compatibility
 Plug and Play support for Win95 environment
 Full compatibility with both ISDN and remote PSTN via ISDN
 Multiple signaling protocol compatibility with the following network switches: DSS1,
1TR6, NI-1, AT&T 5ESS, and Northern Telecom DMS 100
 Supports X.75, V.110, V.120, and PPP Async-to-Sync Conversion B Channel
protocols
 B Channel speed 56Kbps and 64Kbps
 112Kbps/128Kbps channel bundling (for DTE #1 only): MLP, CCB, and Multilink
PPP(RFC1717)
 V.42bis data compression using the X.75, V.120, and Bundle protocols

Chapter 1 - Introduction
1-2
 Two application program interfaces:
- ZyXEL ISDN AT Commands
- CAPI 1.1a (CAPI 2.0 will be available by firmware upgrade.)
Intelligent Features
 Automatic ISDN/analog call detection
 Two analog telephone jacks (analog adapters) with metering pulse function
 Embedded protocol analyzer with color (ANSI) display
 Built-in internal speaker with volume control
 Push-button switch for quick dial and tear down
 Call-back security with password protection
 Flash EPROM memory for easy firmware upgrades
Technical Specifications
 Status Display: 13 LED indicators
 Flow Control: Software XON/XOFF or hardware CTS/RTS
 Configuration Setting: Software programmable with nonvolatile memory for profile
storage
 Diagnostics: Self test and loopback
 Two independent DTE ports:
DTE Port #1:
- Asynchronous: Auto Baud Rate up to 460.8Kbps
- Synchronous: Configurable Rate up to 128Kbps
DTE Port #2:
- Asynchronous: Data Rate up to 230.4Kbps
- Synchronous mode
Note: At the time of its initial release on the market, the Omni TA128’s
Synchronous DTE mode is not available. This feature will be firmware
upgradeable at a later time (date to be confirmed).
Physical Charachteristics
 Line Interface: RJ-45 for S/T or U interface, RJ-11 for built-in terminal adapter
 DTE Interface: DB-25 connector for DTE#1, DB-9 connector for DTE#2
 Weight (g): 369, Dimensions (cm): L-13.1 x W-17.9 x H-3.8
U-Interface Option
For the North American ISDN, ZyXEL provides an optional 2B1Q U-interface which
allows direct connection to the network without the use of an external NT-1 device.

Chapter 1 - Introduction
1-3
Unpacking Your Omni TA128
Your Omni TA128 modem should come with the equipment listed below. If any item is
missing or damaged, please contact your Dealer or ZyXEL Customer Service Department
immediately.
1) one (1) Omni TA128 ISDN Terminal Adapter
2) one (1) power adapter
3) two (2) RJ11 telephone cables
4) one (1) RJ45 ISDN telephone cable
5) one (1) shielded RS-232 25-pin to 25-pin cable (6 feet)
6) one (1) short shielded cable for RS-232 9-pin to 25-pin conversion
7) one (1) 3.5" driver and utility disk
8) what software to be included
9) one (1) warranty/registration card
10) one (1) Omni TA128 User's Manual
11) one (1) Quick Reference Guide
How to Become a Registered Owner
Complete the pre-addressed registration card and place it in the mail. Registered owners
will receive future product information and update announcement. Please also save your
dated invoice as proof of purchase.

Chapter 2 - Installing your Omni TA128
2-1
Chapter 2 - Installing your Omni TA128
Connecting Your Omni TA128 to the Power Supply
You will find the following switch and connectors on the back panel of Omni TA128:
ON/OFF Power switch; turns the TA ON or OFF
POWER Input terminal for power adapter
To DTE 1 Serial port DB25 female connector for connection to the serial port of a
DTE (computer/terminal). This is the DTE Port #1.
To DTE 2 Serial port DB9 female connector for connection to the serial port of a
DTE (computer/terminal). This is the DTE Port #2. This port is currently
not in use.
ISDN ISDN RJ45 terminal jack; connects to a S/T interface or a U interface
(depending on the Omni TA128 model purchased).
PHONE 1 RJ11 terminal jack for analog adapter 1; for connecting to analog
equipment (phone, fax, answering machine, etc.)
PHONE 2 RJ11 terminal jack for analog adapter 2; for connecting to analog
equipment.
The signal-pin assignment of the RJ45 and RJ11 phone jacks are listed in Appendix A.
To Connect your Omni TA128 to the power supply, follow these instructions:
1) Turn off your computer.
2) Make sure the power switch on the Omni TA128 is in the OFF (down) position.
3) Connect the round end of the power adapter to the POWER JACK on the modem’s
back panel (see Figure 2-1).
4) Plug the power supply unit to an AC wall jack then turn on the power switch on the
Omni TA128.
5) Observe the LED light status on the front panel of your Omni TA128 and make sure
PWR LED is on.
Note: Use only the power adapter supplied with your modem. Never use a power
adapter designed for a different product.
Figure 2-1

Chapter 2 - Installing your Omni TA128
2-2
Connecting the Omni TA128 to Your Computer
Your Omni TA128 comes with two serial ports (RS232C port), one with 25 pin
connector and one with 9 pin connector. When you first install the Omni TA128 The
main serial port (the one with 25 pin connector) should be used
Your Omni TA128 comes with a 25 pin, male to female cable, which is to be used to
connect the main serial port of Omni TA128 to your computer serial port. Please see
diagrams below:
Connecting the Omni TA128 to your Computer Serial Port
Figure 2-2
1) Find the 25 pin serial port of your Omni TA128.
2) Connect the male end of the 25 pin cable to the serial port of the Omni TA128.
3) Connect the other end of the cable (female end) to your computer’s serial port. In
case your computer only supplies a 9 pin serial connector, you will need to use a 25
pin to 9 pin converter (9 pin female to 25 pin male). If you have another type of
serial port connector, such as on the Macintosh, you will need a special cable for the
connection.
4) Once the connection is made, you can turn the computer back on.

Chapter 2 - Installing your Omni TA128
2-3
Connecting the Omni TA128 to Your ISDN Line
The Omni TA128 comes with a choice of two types of ISDN line interfaces:
 Omni TA128 comes with an S/T interface. This can only connect to your NT-1
(Network Termination) device.
 Omni TA128U comes with a U interface. This allows you to connect directly to
your ISDN wall jack.
S/T Interface Model
If you have purchased the Omni TA128 or Omni TA128S/T model, you will need an
NT-1 device to connect to the network.
Figure 2-3
Although there are a lot of NT-1s on the market, most of them have two sets of RJ-11 or
RJ-45 jacks:
 One set will be marked “Line,” “ISDN,” “Wall,” or “U.” It should be a single RJ-11
or RJ-45 jack.
 The other set will be marked “Terminal” or “S/T.” It can be either a single or
multiple RJ-45 jack(s).
Before making the connection, make sure that the termination is set up properly. The
termination set-up depends on the number of devices connected to the NT-1 and how the
devices are connected. It also depends on the distance from the device(s) to the NT-1.
Please refer to the NT-1 manual for more information.
When the telephone company installs your ISDN line, you can specify the type of jack
you want installed. You should order the jack that is recommended by the NT-1 device.
In most cases, RJ-11 jacks will be installed unless you specified otherwise (In Canada,
RJ-45 jack will be installed). The NT-1 device should come with the proper cable for
connection from the wall jack and the NT-1’s line jack.
No matter what kind of wall jack you have installed, only the center two pins are
connected.

Chapter 2 - Installing your Omni TA128
2-4
The cable connecting the NT-1 device to the Omni TA128 is provided for you. It is an
RJ-45 to RJ-45 cable with four conductors running through it.
Once everything is set up, connect the Omni TA128 to your ISDN line:
1) Use the phone cable (RJ-45) that is included, connect the Omni TA128 “ISDN S”
jack to your NT-1 “Terminal” or “S/T” jack.
2) Using the proper cable, connect your NT-1 “line” or “U” jack to the wall jack
installed by your phone company.
3) Make sure all the connectors are properly inserted.
Note: If you are using the ISDN line for all your communications, we recommend
that you use a UPS (Uninterruptable Power Supply) to provide backup
power for the NT-1 and the Omni TA128. Otherwise, these units as well as
any devices attached to the POTS port will not function in the event of a
power loss at your location.
U Interface Model
If you have purchased the Omni TA128U, you can connect the U-Interface directly to
the wall jack.
In most cases, the ISDN jack installed by the phone company is a RJ-11 jack (except in
Canada, where RJ-45 jack will be installed), and the U-Interface jack on the back of the
Omni TA128U is a RJ-45 jack. A RJ-45 to RJ-45 (or RJ-11 to RJ-45, depends on your
regional distributor’s request) phone cable is included with your Omni TA128U.
To connect the Omni TA128 to your ISDN line:
1) Connect the RJ-45 connector to the “ISDN U” jack on the back of the Omni
TA128.
2) Connect the other end of the RJ-45 cable (or RJ-11) to your wall jack.
Power On and Self Diagnostics
Once you have completed all of the installation steps above, flip the Omni TA128’s
On/Off switch to the ON (up) position.
The unit should cycle through a self test sequence, where you should see a series of LED
lights blinking. After this cycle is complete, the PWR light should stay on.
If the test routine fails, the LNK LED flashes. Please refer to Chapter 15 “Diagnostics
and Protocol Analyzer” for more information on the self-test and its error codes.
If you have a communication program loaded and active (connected to the same serial
port that the Omni TA128 is connected to), you should see the DTR on DTE1 lights go
ON after the self test.
Note: The Omni TA128 takes longer to initialize than a regular modem because it
requires that communication first be established with your local switch
when it is powered on.

Chapter 2 - Installing your Omni TA128
2-5
Omni TA128 Front Panel
Figure 2-4
The LED Indicators
PWR Poweron indicator; lights up when the Omni TA128's power is turned ON.
LNK Physical layer (layer 1) active indicator; lights up when Layer 1 of the S0
interface is active; flashes when the data link layer of D channel is in multiple
frame mode.
B1 B1 channel connection indicator; lights up when B1 channel is established;
flashes when there are re-transmissions of packets.
B2 B2 channel connection indicator; lights up when B2 channel is established;
flashes when there are re-transmissions of packets.
AA Auto-answer indicator; lights up when the Omni TA128 is in Auto Answer
mode; flashes when it rings.
DTE 1
DTR Data terminal ready indicator; lights up when the DTE or Computer connected
to the DTE Port #1 indicates that it is ready for communication by raising the
corresponding RS232 signal.
TXD Transmit data indicator; flashes when the DTE/Computer is transmitting data to
the DTE Port #1 of the Omni TA128.

Chapter 2 - Installing your Omni TA128
2-6
RXD Receive data indicator; lights up when the DTE/Computer is receiving data
from the DTE Port #1 of the Omni TA128.
DTE 2
DTR Data terminal ready indicator, lights up when the DTE or Computer connected
to the DTE Port #2 indicates that it is ready for communication by raising the
corresponding RS232 signal.
TXD Transmit data indicator; flashes when the DTE/Computer is transmitting data to
the DTE Port #2 of the Omni TA128.
RXD Receive data indicator; lights up when the DTE/Computer is receiving data
from the DTE Port #2 of the Omni TA128.
Phone
1Hook status of the analog adapter 1, lights up when the telephone handset is
picked up (off-hook).
2Hook status of the analog adapter 2, lights up when the telephone handset is
picked up (off-hook).
Front Panel Switch
When the TA128 is in command state, pressing the front panel button causes the Omni
to dial the default phone number pre-stored in the NVRAM. The default number pointer
to the telephone directory is assigned by the AT*Dncommand.
When the Omni TA128 is on-line, pressing the button will tear down the connection and
bring it into command state.
To restore the Omni TA128 to its factory default settings and initiate the loop-back test,
press and hold the switch for 3 seconds while turning the power ON.
Understanding AT Commands
The Omni TA128 communicates asynchronously with computers using AT commands.
AT commands are used to configure and control the Omni TA128. A command
statement is usually sent to the modem by being typed from the computer keyboard.
Command statements must be written in a specific form in order for the Omni TA128 to
recognize them. A command statement begins with the letters “AT” or “at”. It is then
followed by one or more commands and then by a<Enter>.
AT commands can only be issued when the Omni TA128 is in “command” or “off-line”
mode.
Once the Omni TA128 has established a connection with the remote device, it goes into
“on-line” mode, and the characters sent from your computer (through the Omni TA128)
are transmitted to the remote device.
In order to issue an AT command statement, you first need to run your communications
software and configure it to the port connected to the Omni TA128. Please refer to your
communications software manual if this is not the case.

Chapter 2 - Installing your Omni TA128
2-7
Once the communication terminal program is running and the Omni TA128 is connected:
Type:
AT<Enter>
Omni TA128 responds:
OK
This confirms that the TA and your computer are communicating correctly.
Supported AT command types:
Type of AT Command Example
Basic AT (Hayes compatible) ATB0
Basic AT$ (on line help) AT$
Extended AT& AT&N0
Extended AT* command AT*I1
S-Register command ATS0=1
S-Register bit-mapped command (set S-Register bit 1
equal to 1) ATS13.1=1
S-Register inquiry command ATS0? Or ATS13.1?
You may also browse the list by using the on-line help commands: AT$, AT*$, AT&$,
and ATS$.
Quick Tips when issuing AT commands:
The ENTER or RETURN key must be pressed to execute a command.
Multiple AT commands can be combined into one line. For example, AT&O2and
ATB02 can be combined into one line AT&O2B02.
The Omni TA128 processes commands from left to right. The AT command that
appears to the right might over-write the command to the left. For example, ATB1B0
will result in ATB0 since both B1 and B0 can not co-exist.
If you see duplicated characters for each one you type, your Omni TA128 and software
both have their echo feature turned on (the Omni TA128 defaults to enable command
echo). To eliminate the double characters, turn off software command echo.
Use “A/” to repeat the last command. No ‘AT’ prefix is needed for this command.
The Omni TA128 supports either verbose result code (i.e. “OK”) or numerical result
code (i.e. “0"). You can use ATVncommand to set it one way or the other:
Command Description
ATV0 Select numerical result code
ATV1 Select verbose result code

Chapter 3 - Configuring Your ISDN Line and Network
3-1
Chapter 3 - Configuring Your ISDN Line and
Network
You are now ready to set-up your ISDN network. Based on our experience, most
problems can be traced back to two factors. Either the line was not ordered correctly, or
the line was ordered correctly, but not programmed correctly.
It would be wise to have your Omni TA128 ready to use before your phone company
comes to install your line. That way, you can enter the SPID to your line and confirm
that the ISDN network is responding properly before the phone installation people leave.
There is a simple Windows 3.x or Windows 95 utility provided by ZyXEL to help you
set-up the network. This set-up procedure needs to be done only once. The network
information will be stored in the non-volatile memory of the Omni TA128. Turning the
power off will not erase the information. The only time you will need to reconfigure your
line is when you perform a hardware reset on your modem or when you change options
on your ISDN line.
ZyXEL Configuration Manager Software
Along with your Omni TA128, you will find a disk labeled “ZyXEL ISDN Configuration
Manager”. The Configuration Manager utility is an easy way to set up and configure
your Omni TA128 without the use of a terminal program. To install this software simply
run the setup file from the Run line. Refer to your Quick Start Guide for instructions on
using the ZyXEL ISDN Configuration Manager.
Figure 3-1 ISDN Configuration Manager
If your Omni TA128 is not going to be set-up by a computer running Windows, you will
need some type of terminal program that allows you to send AT commands to the
modem and receive responses from the modem.