Multi Tech Equipment Mta128St Users Manual

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2015-02-09

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Models MTA128ST and MTA128NT

External ISDN Terminal Adapter

User Guide

Model MTA128ST/NT

S000305C Rev. C

This publication may not be reproduced, in whole or in part, without prior written permission from Multi-Tech Systems,

Multi-Tech Systems, Inc. makes no representations or warranties with respect to the contents hereof and specifically

disclaims any implied warranties of merchantability or fitness for any particular purpose. Furthermore, Multi-Tech

Systems, Inc. reserves the right to revise this publication and to make changes from time to time in the content

hereof without obligation of Multi-Tech Systems, Inc. to notify any person or organization of such revisions or

changes.

Revision Date Description

A 7/25/03 The manual replaces 82052305 Rev. G. Manual updated with NT info. AT commands

and S registers moved into additional documentation on CD.

B 11/05/04 Changed temperature from -50 to-40 C.

C 09/06/07 Update tech support contact list.

Trademarks

IWay, IWay Hopper, Multi-Tech, and the Multi-Tech logo are trademarks of Multi-Tech Systems, Inc. AT&T and

5ESS are registered trademarks of American Telephone and Telegraph. Microsoft, Windows, and Windows 95 are

registered trademarks of Microsoft Corporation. NETCOM is a registered trademark of NETCOM On-Line

Communication Services, Inc. Netscape and Navigator are trademarks of Netscape Communications Corp.

DMS-100 is a trademark of Northern Telecom. All other trademarks are owned by their respective companies.

Multi-Tech Systems, Inc.

2205 Woodale Drive

Mounds View, MN 55112

U.S.A

Telephone (763) 785-3500 or (800) 328-9717

Fax (763) 785-9874

Technical Support (800) 972-2439

Internet http://www.multitech.com

Contents

Chapter 1: Introduction and Description ........................................................................................................................4

Welcome to the world of ISDN communications. ................................................................................................................ 4

Product Description.............................................................................................................................................................. 4

Features............................................................................................................................................................................... 5

LED Indicators .................................................................................................................................................................... 8

Technical Specifications ...................................................................................................................................................... 10

Chapter 2: Hardware Installation .....................................................................................................................................11

Safety Warnings .................................................................................................................................................................. 11

Connecting your TA ............................................................................................................................................................. 11

Chapter 3: Configuration Utilities ...................................................................................................................................13

Introduction ......................................................................................................................................................................... 13

Before You Start ................................................................................................................................................................. 13

Configuring your TA ............................................................................................................................................................. 17

Chapter 4: AT Commands, S-Registers, and Result Codes..........................................................................................26

MTA128ST/NT Commands and S-Registers ...................................................................................................................... 26

S-Registers ......................................................................................................................................................................... 29

Chapter 5: Troubleshooting..............................................................................................................................................34

Troubleshooting the TA........................................................................................................................................................ 34

Chapter 6: Point-to-Point Communications: PPP/MLPPP.............................................................................................41

Chapter 7: Warranty, Service, and Tech Support...........................................................................................................44

Multi-Tech Systems, Inc. Warranty & Repairs Policies .......................................................................................................44

Online Warranty Registration .............................................................................................................................................. 45

Service ................................................................................................................................................................................. 45

Replacement Parts .............................................................................................................................................................46

Technical Support ............................................................................................................................................................... 47

Appendix A:Configuration Profiles..................................................................................................................................48

Quick Setup Factory Profiles .............................................................................................................................................. 48

Quick Setup Example ......................................................................................................................................................... 48

Appendix B: Ordering Your ISDN Line ...........................................................................................................................49

Loop Qualification ...............................................................................................................................................................49

Bearer Service ..................................................................................................................................................................... 50

Using ISDN Ordering Codes (IOCs) .................................................................................................................................... 50

Ordering ISDN Without IOCs...............................................................................................................................................52

Appendix C: FCC and Canadian Regulation ..................................................................................................................56

FCC......................................................................................................................................................................................56

Canadian Limitations Notice ................................................................................................................................................ 57

Appendix D: Configuration Methods ...............................................................................................................................58

Firmware-based Configuration Utility................................................................................................................................... 58

Configuration via AT Commands.........................................................................................................................................58

Glossary..............................................................................................................................................................................59

Index....................................................................................................................................................................................65

Introduction and Description

Chapter 1: Introduction and Description

Welcome to the world of ISDN communications.

You have acquired one of the finest ISDN terminal adapters (TAs) available today, model MTA1 28ST/NT

from Multi-Tech Systems. The MTA128ST is a desktop TA with an S/T interface port to connect itto the

ISDN network and an analog port to connect it to a telephone, modem, or fax machine. The MTA1 28NT is a

desktop TA with a U-interface to connect it to the ISDN network and an analog port to connect it to a

telephone, modem, or fax machine. The TAs ship with a software configuration utility for Windows® 98/NT/

ME, and ConfigMenu, a built-in configuration utility for Windows and non-Windows operating systems. In

addition, the MTA128ST/NT accepts AT commands that enable itto use the same communications

software as an analog modem.

The MTA128ST is compatible with the popular EuroISDN switch protocol, it communicates using ISDN

BRI (2B+D) service, which provides up to 128 Kbps data and voice communications, and it automatically

detects whether an incoming call is voice or data and handles it appropriately.

The MTA128ST/NT provides dial-up asynchronous communication capability with other personal

computers, terminals, on-line computer services, or other computer systems. Connection to your

computer/terminal device is made via the RS232 connector (ISDN). Connection to analog devices is

accomplished with an RJ1 1 connector and one RJ45 connector is used for your ISDN connection.

This User Guide will help you install, configure, and operate your MTA128ST/NT.

Product Description

There are two ISDN interface options, S/T and U. If you purchased the S/T interface adapter

(MTA128ST), you need an ISDN NT1 device connection to the ISDN switch. If you purchased the U

interface adapter (MTA1 28NT), it can directly connect to the ISDN switch (figure 1-1).

Figure 1-1. ”S/T” and “U” Interface Options

Introduction and Description

Your ISDN TA is compatible with prevalent ISDN switch protocols. It communicates using ISDN BRI

(2B+D) service, which provides up to 128K bps data communications. This manual documents the

following models:

• MTA1 28ST for S/T interface with one POTS port

• MTA1 28NT for U interface with one POTS port

Some analog devices, including telephone set, answering machine, and modem, can be connected to the

POTS port via an RJ-1 1 jack.

This User Guide will help you install, configure, and operate your terminal adapter.

Features

The MTA128ST/NT communicates over public ISDN telephone lines. Features include:

• Compatibility with EuroISDN (ETSI/DSS1/NET3), French VN4, and Japanese INS64 switch protocols

• Compatibility with U.S. NI-1, AT&T 5ESS, and DMS-100 switch protocols

• Compatibility with V.120, ML-PPP, and X.75 protocols

• Transparent synchronous communication capability (CLEAR)

• ISDN BRI (2B+D) and analog ports

• RS232E serial port

• Serial port speeds to 460.8 Kbps

• Support of PPP (Point-to-Point Protocol) for high speed ISDN connections

• Tone detection to allow use of a standard telephone for ISDN line access (an ISDN telephone is not

required)

• Automatic detection of incoming calls as voice or data

• Windows 98/NT/ME software utility and a firmware utility for easy ISDN line configuration

• AT commands, S-registers, and result codes

• Ability to use the same communications software as analog modems

• Flash memory for easy firmware upgrades

ISDN BRI Line

Before running the ISDN adapter, you need to get an ISDN BRI (Basic Rate Interface) line from your local

telephone company. Your ISDN service provider will provide information to you about the ISDN central

switch type, pertinent subscriber information and SPID (Service Profile ID) number(s) if required.

SPID (Service Profile ID)

The Service Profile ID (SPID) is applicable in the U.S. only. SPIDs are a series of numbers that inform the

central office switch which services and features to provide to an ISDN device. The generic SPID format

comprises 14 digits. The first 10 digits are the main telephone number on the terminal. The last 4 digits

are dependent on the number of terminals on the interface and the services they support.

NT1 Connection

An ISDN Basic Rate (BRI) U-Loop consists of 2 conductors from the CO (telephone company central

office) to the customer premises. The equipment on both sides of the U-loop has been designed to deal with

the long length of the U-loop and the noisy environment it operates in. At the customer premises the U-loop

is terminated by an NT1 (network termination 1) device. An NT1 is a device which provides an interface

between the two-wire twisted-pairs used by telephone companies in their ISDN BRI network and an end-

user's four wire terminal equipment. The NT1 drives an S/T-bus which is usually made up of 4 wires, but in

some cases may be 6 or 8 wires.

The name of the S/T bus comes from the letters used in the ISDN specifications to refer to two reference

points, Sand T. Point Trefers to the connection between the NT1 device and customer supplied

equipment. Terminals can connect directly to NT1 at point T, or there may be a PBX (private branch

exchange, i.e. a customer-owned telephone exchange). When a PBX is present, point S refers to the

connection between the PBX and the terminal. Note that in ISDN terminology, "terminal" can mean any

sort of end-user ISDN devices, such as data terminals, telephones, FAX machines, etc. The diagram

which follows reflects interface points in a typical ISDN network.

Introduction and Description

If your ISDN product operates with a S/T outlet interface, you need an NT1 device to connect to the ISDN

switch. MTA128ST adapters need an NT1 device to connect to the ISDN switch, but the MTA128NT

adapter does not require NT1 device. In the UK, and in many European countries, NT1 device is supplied by

your telephone company.

Figure 2-1 ISDN Interface Points

S/T Interlace

The S/T interface uses an 8-conductor modular cable terminated with an 8-pin RJ-45 plug. An 8-pin RJ45

jack located on the terminal is used to connect the terminal to the DSL (Digital Subscriber Loops) using this

modular cable.

Table 2-1 shows the Pin Number, Terminal Pin Signal Name and SILC Pin Signal name for the S/T interface

Pin TE Signal

1 Not used

2 Not used

3 Tx+

4 Rx-

5 Rx+

6 Tx-

7 Not used

8 Not used

U Interlace

The U interface uses a 2-conductor twisted pair cable terminated with an RJ-45 jack. An RJ-45 jack located

on the terminal is used to connect the terminal to the Digital Subscriber Loops using this twisted pair cable.

In Table 2-2 the Pin Number, Terminal Pin Signal Name and UILC Pin Signal Names for the U interface are listed.

1 N/A

2 N/A

3 N/A

4 Positive Input

5 Negative Input

6 N/A

7 N/A

8 N/A

Introduction and Description

LED Indicators

The ten LED indicators on the front panel (see figure below) of the MTA1 28ST/NT report status and line activity.

Transmit Data

Flashes when data is being transmitted (on for a space, off for a mark).

Receive Data

Flashes when data is being received (on for a space, off for a mark). Link

Status

For EuroISDN NET3, INS64, and VN4 switch protocols, lights when the TA is turned on. For US NI-1, DMS-

100, and AT&T 5ESS switch protocols: On Steady, Link with central office is established (requires correct

configuration of SPIDs) Flashing, Physical layer is down or one or both SPIDs have not been verified with

central office

Bearer Channel 1

When lit, indicates active data or voice connection on bearer channel 1.

Bearer Channel 2

When lit, indicates active data or voice connection on bearer channel 2.

Terminal Ready

Lights to indicate that the computer is communicating with the MTA1 28ST/NT, so the MTA1 28ST/NT can

answer an incoming call.

Off Hook

Lights when analog equipment on AUX port is active or off-hook.

128 Kbps

Lights to indicate that the B channels have been multiplexed into a single 128 Kbps communications link.

Data Protocol

Lights in combination with P2 and 128 LEDs to indicate which data protocol (V.110, V. 120, X.75, PPP,

MLPPP) is in use as shown in the table below.

Data Protocol

Lights in combination with P1 and 128 LEDs to indicate which data protocol (V.110, V. 120, X.75, PPP,

MLPPP) is in use as shown in the table below.

Introduction and Description

Data Protocol 128 LED P1 LED P2 LED

V.110

V.120

X.75 (1 channel)

PPP (1 channel)

MLPPP (2 channels)

OFF ON

Introduction and Description

Technical Specifications

Trade Name Iway Hopper™

Model Number MTA128ST (International),

MTA128NT

Network Interface ST-Four-wire S/T interface

NT-2-wire “U” interface

Switch Compatibiltiy EuroISDN (ETSI/DSS1/NET3), VN4, INS64, U.S. NI-1, AT&T 5ESS,

DMS-100 (both models support all of the switch protocols)

B-Channel Protocols V.120, X.75, PPP, ML-PPP, CLEAR

Voice Coding PCM: A-Law; µ-Law (switch protocol dependent)

LED Indicators 10 front panel LED indicators: Transmit Data, Receive Data, Link Status,

B1 Active, B2 Active, Terminal Ready, Off Hook (AUX port), 128Kbps,

P1 Active (data protocol), P2 Active (data protocol)

Data Rates 300, 1.2K, 4.8K, 9.6K, 38.4K, 56K, 57.6K, 64K, 115.2K, 230.4K, and

460.8K bps

Async Data Format 7 bit data + odd/even parity + 1 start/stop, 8 bit no parity. 36 baud

rate/parity settings via S-register. Baud rates of 300-460.8K bps with

even, space, mark, odd, or no parity.

Data Connections Two ISDN B-channels

One ISDN D channel

One analog port for connecting a standard telephone, modem, or fax

machine.

Command Interface AT commands, S-registers, result codes, ConfigMenu firmware

configuration utility, Windows 98/NT/ME configuation utility, Dail-Up

Networking (DUN)

Connectors ISDN: RJ45 female receptacle, 4-wire S/T (accepts connection cable to

the network provider’s NT1 device) or 2-wire U interface

AUX: RJ11 female receptable, 2-wire voice service

Serial Port: female DB-25 RS232E/V.24

Serial Interfaces ITU-T V.24, EIA/TIA RS232E

Switches Two-position power switch

Power Requirements Two-prong outlet-mounted transformer (included), 240 VAC 50/60 Hz

Dimensions 15.0 cm x 10.7 cm x 2.8 cm (L x W x D)

Environmental Tenperature range 0° - 40° C (32° - 104° F)

Humdidity range 20-90% (noncondensing)

Power Consumption 4 watts

Weight 224 g (8 oz)

Warranty 5 years

Hardware Installation

Chapter 2: Hardware Installation

This chapter shows you step-by-step how to set up your MTA1 28ST/NT terminal adapter (TA) to your computer,

power, network terminator, and an auxiliary analog device. Please follow these instructions carefully to avoid

damage to your TA.

Safety Warnings

• Use this product only with UL-listed and CUL-listed computers.

• Never install phone wiring during a lightning storm.

• Never install a phone jack in a wet location unless the jack is specifically designed for wet

locations.

• Never touch uninsulated phone wires or terminals unless the phone line has been

disconnected at the network interface.

• Use caution when installing or modifying phone lines.

• Avoid using a phone (other than a cordless type) during an electrical storm; there is a risk of

electrical shock from lightning.

• Do not use a phone in the vicinity of a gas leak.

• To reduce the risk of fire, use only 26 AWG or larger telephone line cord.

Connecting your TA

Turn off your computer. Place the modem in a convenient location, connect it to your computer’s serial

port, to the phone line, to AC power, and to your phone.

CableConnections.

Connect the TA to theACPower Outlet

Plug the DC power transformer into an AC power outlet or power strip. Plug the DC power transformer into

the POWER jack on the TA.

Note: Use only the DC power transformer supplied with the TA. Use of any other transformer voids the

warranty and can damage the TA.

Hardware Installation

Turn on the TA by sliding the power switch to ON and verify operation by observing the LEDs on the front

panel. The LEDs first flash in a self-test pattern. Then the LS LED remains on. If the TA does not appear to

be working, Refer to Chapter 5 for troubleshooting help.

Connect the TA to Your PC (RS-232 Connection)

Plug one end of the RS-232 serial cable into the RS-232 connector on the modem, and plug the other end

into a serial port connector on your computer, such as COM1 or COM2. You supply the RS-232 cable.

Connecting to your ISDN Network Terminator

If you need a longer cable than the one provided with your TA, select a cable that is wired straight through

(pin 1 to pin 1; pin 2 to pin 2, etc) with at least the middle four pins connected (pins 3, 4, 5, and 6).

Plug one end of the cable into the ISDN jack on the TA and the other end into the jack on your network

terminator (MTA128ST) or U-interface (MTA128NT).

Note: The PHONE jack and ISDN jack are not interchangeable.

(Optional) Connecting to Analog Equipment

You can connect an analog device such as an analog telephone, modem or fax machine to the TA. Simply

put the device’s module telephone cable into the PHONE Jack (RJ1 1) on the TA.

Note: The PHONE jack and the IDSN jack on the TA are not interchangeable.

Configuration Utilities

Chapter 3: Configuration Utilities

Introduction

You can configure the MTA128ST/NT to match your ISDN service and the remote terminal adapter (TA) with any

of four methods listed below:

•

ISDN TA Configuration Utility

This configuration utility is recommended for computers running Windows 98/NT/ME operating systems.

Because it is a software-based utility, you can use it to create and store as many configurations as you

want.

•

Con figMenu

This firmware-based configuration utility is recommended for computers running other OS with terminal

capabilities. To run it, you must have a VT100/ANSI-compatible terminal or a data communication

program that includes VT100/ANSI terminal emulation.

•

Windows Dial-Up Networking

With Dial-Up Networking you can gain access to shared information on another computer, even if your

computer is not on a network. The computer you are dialing in to must be set up as a network server for

you to use its shared resources. Windows includes a remote-node client called Dial-Up Networking (DUN).

The MTA128ST/NT can be configured to communicate using this utility.

• AT Commands

If you prefer using AT commands or want to fine tune the operation of your TA, configure your TA by

using AT commands and S-registers much as you would configure an analog modem. You must enter

these commands in your data communication program’s terminal mode. For more information see ST

and NT AT command documents included on this CD.

Before You Start

Whatever method you use to configure your TA, consider your network and call control configuration choices and

COM port settings beforehand listed below and record your choices. Refer to them during the configuration procedure.

Before you begin, verify your switch type and TEI with your local ISDN provider and have that information readily

available

Network Configuration

Network Switch Type_________________________________

Select the network switch type your ISDN service provider uses at its local central office. You can set the

MTA128ST/NT to NET3 (DSS1), VN4, INS64, U.S. NI-1, AT&T 5ESS, or DMS-100. If you don’t know the switch type,

get the information from your ISDN service provider.

AT command: !C0....

Data TEI ___________________________________________

Data TEI is the TEI assigned to the data channel. You can select Auto TEI, a fixed TEI, or Disable.

A TEI

(terminal

endpoint identifier) is a number used by the central office switch to uniquely identify each device connected to the

network. When it uses dynamic TEI assignments (Auto TEI), the central office switch assigns a TEI each time the

TA connects to the network. However, the ISDN service provider may assign a fixed TEI at subscription time, in

which case you must configure the TA with the fixed TEI number. You also can disable the channel, which may be

useful when multiple TAs are attached to a network terminator bus.

AT command: !D3....

Configuration Utility

Voice TEI___________________________________________

Voice TEI is the TEI assigned to the voice channel. Choices are: Auto TEI, a fixed TEI number, or Disable.

AT command: *!D3.....

Data MSN __________________________________________

The Data MSN (multiple subscriber number) allows a caller to specify an individual TA when more than one TA is

connected to you network terminator. If you don’t assign a value to the MSN, the TA accepts all incoming calls. If you

only assign a base address to the MSN, the TA accepts any incoming call with the same base address, regardless of

whether a subaddress is included. If you assign a base address and a subaddress to the MSN, the TA only accepts

calls that match both the base address and the subaddress. The following examples show the syntax for setting

the MSN with and without a subaddress.

AT command: !N1....

MSN with subaddress: 5551000:001 (base address is 5551000; subaddress is 001)

MSN without subaddress: (base address is 5551000)

Voice MSN _________________________________________

Selects calls on the voice channel in the same way the Data MSN selects calls on the data channel.

AT command: *!N1....

SPIDs and DNs______________________________________

The TA must be configured with the Service Profile Identifier

(SPID).

The SPID is assigned by the local phone

company and is for the specific BRI line where the TA is attached. The SPID field is empty prior to configuration.

AT commands: AT!C6= and AT*!C6=

Directory Number (DN) is the phone number another user calls to contact this TA once it is attached to the ISDN.

AT commands: AT!N1= and AT*!N1=

Note: SPIDs and DNs are used only by the U.S. NI-1, AT&T 5ESS, and DMS-100 switch types.

Call Control Configuration

Persistent DTR Dialing _______________________________

A high DTR (Data Terminal Ready) signal on the RS232/V.24 serial port indicates your computer

terminal is

ready to communicate with your TA. DTR normally goes high when a communication program starts or is ready to

dial. Persistent DTR dialing enables the TA to automatically redial the number stored in memory location 0

whenever DTR is high and the serial port does not have an active call. You can enable or disable this feature.

AT command: $D.

Auto Answer Data Calls_____ Rings to Answer______

Select Auto Answer if you want your TA to automatically answer all incoming data calls (this option does not affect

the analog port). The Rings to Answer number, in the range of 1 to 255, selects the number of rings the TA waits

before answering an incoming call. The default is one ring.

AT command: S0=

Dialing Method______________________________________

Select either the Enbloc or the Overlap dialing method for use when establishing a data call.

Your ISDN

provider

determines the dialing method. The enbloc method is used for most ISDN dialing; however, you can select the

overlap method if you are working with a private network.

AT command: %A97=

Data Protocol _______________________________________

The data protocol, also known as the B-channel protocol and the rate adaption protocol, is the language

spoken

over each 64 Kbps channel between two ISDN devices. The devices on both ends of the ISDN link must use identical

protocols.

AT command: !Z=

Configuration Utility

V.120 Protocol—Similar to V.1 10 protocol, but provides rates up to 64000 bps on each B channel.

X.75 Protocol—Packet-switched network protocol for international use. Layer 2 portion of this protocol is

used commonly as a rate adaption protocol.

MLPPP Protocol—MLPPP (Multi-Link PPP) protocol provides rates up to 64 Kbps per channel. This

protocol uses both B channels at once, providing an aggregate data transmission speed of 128 Kbps.

Dialing Numbers_______________________________

The MTA1 28ST/NT can dial telephone number n, where n can be up to 20 characters.

AT command: Dn (n = phone number).

Stored Numbers _______________________________

The MTA128ST/NT can store as many as ten phone numbers, up to 20 characters each.

AT command: &Z=

Dialing Stored Numbers ________________________

The MTA1 28ST/NT can dial a number previously stored in directory number n with the &Zn=x command.

AT command: e.g., DS3

COM Port Settings

COM port settings control how your TA communicates with your computer through the RS232/V.24 serial

port.

Select the initial speed at which your TA communicates with your computer. For V.110 data protocol, the

Baud Rate or Bit Rate___________________________

rates must be identical on the localand remote TAs and may not exceed 38400 bps. For all other data

protocols (V. 120, MLPPP, X.75, etc.), the default initial baud rate is 115200 bps. Typically, in command

mode, the MTA1 28ST/NT selects a serial port speed of 300, 1200, 2400, 4800, 9600, 19200, 38400,

57600, 115200, or 230400 bps depending on how fast the AT commands are coming from the computer or

terminal. The $SBn command sets the default serial speed used when the TA first powers up. Using the %S

command you can disable automatic speed selection and lock the serial port speed to 460800 bps. See

Serial Port Configuration Commands in Chapter 4 for more information.

AT commands: $SB or %S

Note: Your computer must have a high speed serial port with a 16550AFN UART, or equivalent, to utilize

ISDN’s high speeds.

Flow Control __________________________________

Select the method by which your TA and computer control the flow of data between them. Unless you

know your computer has special requirements, select the default RTS/CTS method. The other choice is

XON/XOFF.

AT command: &E

Data Bits, Parity, and Stop Bits ___________________

These settings further control initial communications between the TA and computer. Unless you know your

computer has special requirements, use the default settings of 8 data bits, no parity checking, and 1 stop bit

(8-N-1). The TA sets these parameters automatically the first time it receives an AT command from the

computer.

AT commands: @P4=, @P3=, @P6=

DTR Detect Time_______________________________

Sets the time, in 0.1-second increments, that DTR must remain low before the TA disconnects. The default

value is 0.5 second; however, you can set it anywhere within the range 0–255

(0.05–25.5 seconds).

AT command: S25=

Configuration Utility

DCD Drop Time _____________________________________

Sets the time, in 0.1-second increments, that a carrier must be lost before the TA disconnects. The default

value is

0.7 seconds; however, you can set it anywhere in the range 0–254 (0–25.4 seconds). Setting DCD Drop Time to

255 causes the TA not to disconnect with loss of carrier when DCD Control is set to Momentary Drop.

AT command: S10=

DTR Control

A high DTR (Data Terminal Ready) signal on the RS232 serial port indicates your computer or terminal is ready to

communicate with your TA. It normally goes high when a communication program starts or is ready to dial. Normal

causes the TA to break the link and go into command mode when DTR drops. Ignore causes the TA to ignore the

DTR signal. Reset on DTR causes the TA to reset when DTR drops for the time specified in register S25.

AT command: &D

CTS Control __________________________________

A high CTS (Clear to Send) signal on the RS232 serial port indicates the TA is ready to receive data.

Normally, it

follows the state of the RTS signal. Select Normal to make CTS act normally. Select Always On to force CTS high

when the TA is offline. When the TA is online, CTS still provides flow control. Select Momentary Drop to cause CTS to

drop momentarily when the link is lost; then to go high again.

AT command: &R

DSR Control __________________________________

A high DSR (Data Set Ready) signal on the RS232 serial port indicates your TA is ready to communicate

with your

computer or terminal. Normally, it follows the state of the DTR signal. Select Normal to make DSR act normally.

Select Always On to cause the TA to ignore the state of the DTR signal. Select Momentary Drop to cause DSR to

drop momentarily when the link is lost; then to go high again.

AT command: &S

DCD Control __________________________________

Normally, the DCD (Data Carrier Detect) signal on the RS232 serial port goes high when the TA receives

connect

message from a remote TA, and drops when the link is lost. Select Always On to satisfy a requirement by some

software packages for this state to be present constantly. Select Normal for normal operation. Select Momentary Drop

to cause DCD to drop momentarily when the link is lost; then to go high again. The length of the drop is governed by

AT command: &C

Asynchronous/Synchronous Mode _______________

Normally, the MTA1 28ST/NT communicates in asynchronous mode. If you need transparent synchronous

communication, change this register setting.

AT command: &M

Configuration Utility

Configuring your TA

If you use Windows 98/Me/NT, perform the following procedure using the Configuration Utility provided on your

system CD. If you are using another operating system, you can configure the TA using the firmware-based

configuration utility or AT commands. Procedures for using the firmware-based configuration utility and AT

commands are described in Appendix E.

Before you begin, verify your switch type and TEI with your local ISDN provider and have that information readily

available

1. When installing from CD, insert the MTA1 28ST/NT System CD into your CD ROM drive. When the

MTA1 28ST/NT Terminal Adapter AutoRun screen is displayed, click on the Config Utility icon. Follow

the on screen directions to load the Configuration Utility onto your pc.

2. When the Configuration Utility is loaded onto your pc, click Start>Programs>ISDNTA Config

Utility. The Welcome screen is displayed

Do you want the wizard to search for your ISDN TA? with the Yes option enabled. Click Nextto continue.

Configuration Utility

3. Searching for TA screen is displayed with please wait while the configuration utility searches for your ISDN

TA(s). This may take up to 20 seconds. Then the Searching for TA screen with Devices have been

identified. Please select a device to configure

Click Next to continue.

4. The Configuration screen is displayed with Select the type of setup, custom building a new configuration, custom

with an existing configuration, or express with an existing configuration.

From the Setup pull down window you can choose Express (Existing), Custom (Existing), or Custom (New).

The Express (Existing) opens an existing configuration, allowing you to modify some elements of the

configuration. Custom (Existing) opens an existing configuration, allowing you to modify all elements of the

configuration. Custom (New) allows you to customize a new configuration.

I have chosen Custom (New) for this example.

Configuration Utility

5. The Network Switch Type screen is displayed with Please select the settings for the Network Switch Type.

Select the network switch type you listed in the Before You Start section of this chapter.

6. Please select the settings for dynamic bandwidth allocation, high and low sampling period and

throughput, and call bumping.

Click Next to continue.

Configuration Utility

7. The TEI (Terminal Endpoint Identifier) screen is displayed with Please select the settings you would like for

Data TEI and Voice TEI.

The TEI is a unique number assigned to the TA at subscription time. The TEI is used by the telephone central

office (CO) to identify the various TAs connected to the ISDN network. The TEI number can be fixed (range 0 -

63) or dynamic and is assigned automatically at the CO each time the TA connects to the ISDN interface and

powers up.

Click Next when you are finished.

8. The SPID (Service Profile Identifier) North America only, is displayed with Please enter the data SPID, voice

SPID, data directory numbers, and voice directory number of your network.

SPID is only used in North America. A SPID is the ISDN network parameter for local terminal identification

Configuration Utility

and tracking. A SPID is assigned by your local ISDN provider when you subscribe, they are in the form of a

string of up to 20 characters. A SPID points to a specific location in the provider’s central office memory where

service and feature parameters are stored.

Click Next when you have entered your SPID information.

9. The Call Control Setup screen is displayed with Please select the settings for call control.

Call Control Setup allows you to set up your terminal adapter and customize how it dials and answers. You can

configure persistent DTR dialing, calling line identification, auto answer data calls, and number of rings. You

can also set the online inactivity timer as well as the dialing method.

Click Next when you are done.

Configuration Utility

10. The Data Protocol Setup screen is displayed with Please select the setting you desire for the Data Protocol.

If you would like the TA to detect the data protocol of an incoming data call and automatically change the TA’s

protocol to match the incoming call, click auto protocol detection check box. Click Next to continue.

11. The Stored Numbers screen is displayed with Please enter the numbers you would like to store.

You can store up to ten phone numbers with up to 25 characters per number. Stored number zero is used if

Persistent DTR Dialing is enabled in Call Control Setup screen.

Configuration Utility

12. The Port Control Setup 1 screen is displayed with Please select the settings you would like for the DTR detect

time, DCD drop time, DTR, DSR, CTS, and DCD signals.

lick Next when you have finished entering your settings.

13. The Port Control Setup II screen is displayed with Please select the settings you would like for the Default

Parity, Default Bit Rate, number of Data Bits, number of Stop Bits, Flow Control, and synchronous

mode.

Click Next when you are finished.

Configuration Utility

14. The POTS Port screen is displayed with Please select the settings for the PORTS port.

When your selections are complete, click Next.

15 The Save Configuration screen is displayed with Please enter the name to store the configuration as in the .ini

file.

You can enter any name up to 35 characters or less in the Store Configuration as: window. Click Next after you

have selected a name.

Configuration Utility

16. The Load Configuration screen is displayed with To load the configuration now, click Next.

17. Your ISDN TA is currently being configured.

When the Finish button becomes active, click Finish.

18. The Configured screen is displayed. Click Finish to exit the Configuration Utility.

AT Commands, S-Registers, & Result Codes

Chapter 4: ATCommands, S-Registers, and Result Codes

MTA128S T/NT Commands and S-Registers

All references to “TA” in this chapter refer to the MTA1 28ST/NT. This chapter also assumes knowledge of

issuing AT commands. <CR> refers to the carriage return character (typically generated by pressing the

ENTER or RETURN key on the keyboard).

For command execution details see the additional documents on this CD.

AT Commands

The TA’s command buffer can store 80 characters, including spaces and other characters used in

telephone numbers. If you mistype a command string, you can edit it by using the backspace or the delete key,

but only before you press <CR>. As you type a command string, it appears on your monitor screen, letting

you verify your input as you type it. The table below lists the AT commands recognized by the TA.

If your MTA1 28ST/NT is connected to a computer terminal, you can send AT commands to the

MTA1 28ST/NT by entering them on the keyboard. If your MTA1 28ST/NT is connected to a computer, you

can send AT commands to the MTA128ST/NT by typing them in the terminal window of a data

communications program such as HyperTerminal. You can also send some AT commands indirectly by

configuring your data communications program.

To enter AT commands, use the following format: AT <command string> <cr>. The characters AT cause the

MTA128ST/NT to interpret the following string as a command. The command string consists of one or more

commands. The carriage return character, <cr>, sends the command string to the MTA128ST/NT. If you are

entering a command string in your communication program’s terminal window, insert the carriage return

character by pressing the ENTER key on your keyboard. If configuring a communications program, you

typically must insert the carriage return character by adding ^M to the end of the command string.

The MTA128ST/NT has three modes of operation: offline command mode (the default state), online

command mode, and data mode. The MTA1 28ST/NT responds to AT commands only when it is in one of

the command modes. After the MTA1 28ST/NT establishes a connection and goes online in data mode, it

interprets any further characters you enter as data rather than as commands and transmits them to the

remote device.

When the MTA1 28ST is in data mode, you can switch it to online command mode by sending it an escape

sequence. The MTA1 28ST/NT responds to two types of escape sequences:

•

In-band where the escape sequence is part of the data stream.

The in-band escape sequence is +++AT<cr>. To change the in-band escape character (+),

change the value in register S2.

•

Out-of-band where the escape sequence is outside the data stream. The out-of-band escape

sequence is <break >AT<cr>. You can send the break signal in the out-of-band escape sequence

only from software, not by pressing SHIFT+BREAK on your keyboard.

When it detects the escape sequence, the MTA1 28ST/NT enters online command mode where it responds

to commands while maintaining the connection with the remote device.

The MTA1 28ST/NT’s command buffer can store 80 characters, including spaces and other characters

used in telephone numbers. If you mistype a command string, edit it by using the backspace or the delete key but only

before you press ENTER. As you type a command string, it appears on your monitor screen, letting you verify your

input as you type it.

The AT commands recognized by the MTA128ST/NT are listed by function in this chapter first in an abbreviated

list. For an alphabetical list of AT commands, see the AT commands documents on the CD included with this

product.

AT Commands, S-Registers, and Result Codes

AT Commands by Function

Command Execution

AT Attention code

A/ Repeat AT Command

Return or Enter Command execution

+++AT<CR> In-band escape code

<BREAK>AT<CR> Out-of-band escape code

General Information Commands

In Display Product Information

Ln List Active Profile Information

!L Display Network Configuration

>MIBn Management Information Block (MIB) Information

Network Configuration Commands

**s User-User Information Element String

%A97=n Dialing Method

>A0=n Type of Coding

!C0=n Network Switch Type

!C6=n Data SPID

*!C6=n Voice SPID

!D0=n V.120 LLC Information Element

!D3=n SAPI-0 Data TEI

*!D3=n SAPI-0 Voice TEI

!DNn Disable Data DN/MSN n

*!DNn Disable Voice DN/MSN n

!ENn Enable Data DN/MSN n

*!ENn Enable Voice DN/MSN n

>MULT=N Multi-point setting

!Nn=s Data DN/MSN n

*!Nn=s Voice DN/MSN n

Serial Port Configuration Commands

&Cn DCD (Data Carrier Detect) Control

&Dn DTR (Data Terminal Ready) Control

$Dn Persistent DTR Dialing

&En Flow Control

&Mn Asynchronous Mode

@P3=n Parity

@P4=n Data Bits

@P6=n Stop Bits

&Rn CTS (Clear To Send) Control

&RFn CTS/RTS Interaction Control

&Sn DSR (Data Set Ready) Control

$SBn Serial Port Speed

%Sn Serial Port Mode

#Xn Send Multiple Xoff Characters

General Configuration Commands

@CONFIG Configuration Menu

En Command Mode Echo

%En Escape Sequence Options

&Fn Load Factory Profile

%Mn Management Mode

Qn Quiet Mode

AT Command, S-Registers, and Result Codes

Sr=n Set S-register

Sr? Read S-register

Vn Verbose Result Codes

&Wn Store Active Profile

Xn Connect Messages

Z Reset to Stored Profile

&Zn= Store Telephone Number

!Z=n Rate Adaptation/Data Protocol

Digital (Data) Call Commands A

Answer Digital Call

Dn Dial Digital Number

DSn Dial Stored Number

Hn Hang up Digital Call

!Hn Digital Call Hold-off Time

&Jn Channel Bundling

O Return Online

Analog (POTS) Call Commands

*An Answer Analog Call

*Bn Send Analog Dial Digit

*Dn Dial Analog Number

*Hn Hang up Analog Call

*!Hn Analog Call Hold-off Time

!RXGn POTS Port Receive Gain

!TXGn POTS Port Transmit Gain

S-Registers

S-registers are sections of memory in which values are stored that affect how the TA operates. S-registers

are so-called because each has a name that begins with the character S. Use the Sr=n command to

assign a value to an S-register or use the Sr? command to read the current value of an S-register. S-

registers are stored in non-volatile RAM (NVRAM) by using the &W0 command. ATZ<CR> restores S-

registers to values stored in NVRAM if any were stored using the &W0 command, otherwise they revert to

factory default settings in ROM. Table 4-2 summarizes the available S-registers and their function.

See the additional documents on this CD for more information on each S register.

S-Register Summary

S-Register Function

S0 Rings Until Answer

S1 Ring Count

S2 Escape Character

S3 Carriage Return Character

S4 Line Feed Character

S5 Backspace Character

S7 Wait for Connection (Abort Timer)

S8 Pause Time for Comma

S10 DCD Drop Time

S25 DTR Drop Time

S26 Delay DTR Monitoring After Connect

S27 RS-232 CLEAR Synchronization Sequence

S29 On-line Inactivity Timer Period

S30 On-line Inactivity Timer

S31 Maximum Re-dial Timeout Value

S32 Escape Sequence Timeout

AT Commands, S-Registers, and Result Codes

S34 Maximum Escape Sequence Length

S44 POTS Port Ring Frequency

S45 Use Dial Tone From Central Office

S46 Pulse-Dial Recognition

S49 POTS Port Dial Tone Gain

S50 Caller Line ID (CLI)

S51 POTS Port Dial Tone Suppression

S52 Auto-Protocol Detection

S53 Maximum X.75 Buffer Size

S54 Force 56Kbps B-Channel Data Rate

S55 Information Transfer Capability for POTS Port Calls

S56 Calling Party Number Information Element Settings

S57 Called Party Number Information Element Settings

S58 Client-side PPP/ML-PPP Authentication Protocol Negotiation

S59 Dynamic Bandwidth Allocation (DBA) Scheme

S60 Bandwidth-On-Demand

(BOD) High Threshold Sampling Period

S61 Bandwidth-On-Demand (BOD) High Throughput Threshold

S62 Bandwidth-On-Demand (BOD) Low Threshold Sampling Period

S63 Bandwidth-On-Demand (BOD) Low Throughput Threshold

S64 Call Bumping (CB)

S65 POTS Call Bump Forwarding Delay

S66 Country Selections for POTS Ring Signal

S67 Single or Dual Cadence POTS Ring Signal

S68 POTS Ring Signal First Active Duration

S69 POTS Ring Signal First Idle Duration

S70 POTS Ring Signal Second Active Duration

S71 POTS Ring Signal Second Idle Duration

S73 MultiLink Endpoint Discriminator Type

S74 Maximum CLEAR Buffer Size

S80 Persistent DTR Dialing Delay

S81 Link Setup Timeout

S84 Data to Terminal Delay

S85 Data to B-channel Delay

S87 INS64 Analog Call Origination Delay

S154 B-Channel Answer Rate

AT Command, S-Registers, and Result Codes

Result Codes

When the MTA128ST/NT receives an AT command from the computer or terminal, it attempts to execute the

command, then sends a status message to the computer or terminal that reports the result of the command.

The MTA1 28ST/NT provides you with several of these response messages, or result codes, which can be

displayed on your monitor or intercepted and used by your communications software. Using the V

command, you can select whether the result codes are terse (numbers) or verbose (words).

The MTA128ST/NT’s result codes are listed below. Note that the speed of an ISDN channel is always

either 56 Kbps or 64 Kbps. Connect messages indicate the speed of the connection between the

MTA1 28ST/NT and your computer or terminal.

TERSE VERBOSE DEFINITION

0 OK TA executed the command without error

1 CONNECT TA established an ISDN connection

2 RING TA detected a ring caused by incoming call

3 NO CARRIER TA did not detect carrier within time allotted by register

4 ERROR Error in the AT command

5 CONNECT 1200 TA connected at 1200 bps

6 NO DIALTONE TA has a poor connection to ISDN network

7 BUSY TA detected a busy signal

8 CONNECT 300 TA connected at 300 bps

9 CONNECT 600 TA connected at 600 bps

10 CONNECT 2400 TA connected at 2400 bps

11 CONNECT 4800 TA connected at 4800 bps

12 CONNECT 9600 TA connected at 9600 bps

14 CONNECT 19200 TA connected at 19200 bps

17 CONNECT 56000 TA connected at 56000 bps

18 CONNECT 57600 TA connected at 57600 bps

19 CONNECT 64000 TA connected at 64000 bps

28 CONNECT 38400 TA connected at 38400 bps

79 PPPC PROTOCOL TA using Point-to-Point protocol

80 HDLC PROTOCOL TA using raw HDLC mode

83 V.120 PROTOCOL TA using V.120 rate adaption protocol

84 X.75 PROTOCOL TA using X.75 rate adaption protocol

87 CLEAR PROTOCOL

TA using CLEAR (transparent) protocol

Using AT Commands to Operate the MTA128ST/NT

You can configure and operate the MTA1 28ST/NT entirely with AT commands if you like. But remember,

you can issue AT commands only from a terminal or from a computer running a communications program in

terminal mode. This section describes how to use AT commands for basic operations, such as calling,

answering a call, and hanging up.

Modes of Operation

The MTA1 28ST/NT has three modes of operation. They are:

•

Offline Command Mode—MTA1 28ST/NT communicates with the terminal or computer and responds to AT

commands. There is no data communications link with a remote device.

•

Data Mode—MTA128ST/NT enters data mode when it makes a successful data communications link

with a remote device. In data mode, the TA can send and receive data, but it does not respond to AT

commands. Instead it treats them as data and transmits them to the remote device.

•

Online Command Mode—MTA128ST/NT responds to AT commands while maintaining a data

communications link; however, transmission of data is suspended. To enter online command mode from

data mode, type the escape sequence +++AT<cr>. To return to data mode from online command

mode, type ATO<cr>.

AT Commands, S-Registers, and Result Codes

Making a Call

Before you can place a data call, configure the MTA1 28ST/NT for the local switch type, serial port speed,

and the data type of the ISDN device you want to call. See Chapter 3, Configuration Utilities.

Dialing

To dial a number using AT commands, you must first start a data communications program. In the

program’s terminal mode, type ATDxxxxxxx<cr>, where xxxxxxx is the telephone number you want to

dial, and <CR> is the carriage return character that is sent when you press the ENTER key, such as

ATD7853500<cr>. The dial string can contain up to 80 characters.

To place an ML-PPP call, use an ampersand character (&) to join two telephone numbers, such as

ATD7853500&7853502<cr>. The telephone numbers can be the same or different. Using this method,

two B-channels are activated to transmit data at an aggregate speed of 128 Kbps.

To make it easier to read the dial string, you can use hyphens, spaces or parentheses. These characters are

ignored by the MTA1 28ST/NT. For example, the MTA1 28ST/NT would read the following dial strings the

same way:

ATD17637853500 <cr>

ATD 1-763-785-3500 <cr>

ATD 1 (763) 785-3500 <cr>

Channel Bundling Flag Dialing

The command AT&Jn is used to indicate whether outgoing calls should be made on two B-channels by

default. The command AT&J1&W0<cr>, configures the TA to place a call, dialing on two B-channels by

default. If no second number is given in the dial string, that single number is dialed twice. This

compensates for the interworking issues with Windows Dial-Up Networking. On the other hand, if the

user explicitly indicates two numbers in the dial string, then two numbers are dialed (e.g.,

ATD7853500&785 3502<cr>). The command AT&J0&W0<cr>, disables automatic call bundling. Note

other valid characters joining two telephone numbers include a plus sign (+), and an exclamation mark

(!).

Note: In Windows Dial-Up Networking, if the Use Country Code and Area Code box is checked in the

Properties window for dial-up connection, the bundling modifier (i.e., &, + or!) is removed from the

dialing string when the user attempts to make a connection. The solution is to not check the Use Country

Code and Area Code box or to simply add the bundling dial modifier to the phone number at the time of

connection.

Canceling a Call

To cancel a call before the MTA128ST/NT makes a connection, press any key.

Storing a Telephone Number

To store a telephone number, type &Zn=x in terminal mode, where n is the number of the memory

For example, type AT&Z9=763-785-3500 <cr> to store the number 763-785-3500 in memory register 9.

Dialing a Stored Telephone Number

To dial a stored telephone number, type DSn in terminal mode, where n is the location of the number

you wish to dial. For example, type ATDS3 <cr> dials a telephone stored in memory register 3 location.

Displaying a Stored Number

To display a stored telephone number, type &Zn? in terminal mode, where n is the memory register

in which the number is stored. For example, type AT&Z5? <cr> to display the telephone number in

memory register 5. To list all ten telephone numbers stored in memory, type ATL <cr>.

Answering a Call

You can answer incoming calls to the MTA128ST/NT either manually or automatically. When the TA

detects an incoming call, it turns on the RI signal on the V.24 interface and sends a RING result code to

the computer or terminal after each ring. If autoanswer is enabled, the TA automatically answers the call.

You can manually answer the call with the A command. Both methods are described below.

AT Command, S-Registers, and Result Codes

Answering Manually

If your communication program is in terminal mode when the RING result code appears on your monitor,

you can manually answer the call by typing ATA <cr>.

Answering Automatically

To cause the MTA128ST/NT to automatically answer a call:

1. Enable autoanswer by setting register S0to the ring on which you want the TAto answer (e.g., in

terminal mode, type S0=4 to make the TA answer on the fourth ring). You also can use either of the

configuration utilities to the turn on autoanswer and set the number of rings.

2. Make sure that the TA is offline.

The TA answers the call after the number of rings specified by S0.To disable autoanswer, use a configuration utility or

the command S0=0.

Note: If the user wants to accept calls while DTR is low, the TA must be configured to ignore DTR. To do this, enter

AT&D0<cr>. With this configuration, the TA can accept calls while DTR is low. If this configuration setting is not

made, the TA rejects incoming calls until DTR is high while calls comes in.

Hanging Up

To hang up a call, escape to online command mode (+++AT<cr>), then enter the H command

(ATH<cr>). The escape sequence and hang up command can be combined into one command string:

+++ATH<cr>.

Troubleshooting

Chapter 5: Troubleshoot ing

Troubleshooting the TA

Introduction

This chapter describes basic problems you may run into with your MTA128ST/NT and how to solve them. Your

MTA1 28ST/NT was thoroughly tested at the factory before it was shipped. If you are unable to make a

successful connection, or if you experience data loss during your connection, it is possible that the MTA1

28ST/NT is defective. However, it is more likely that the source of your problem lies elsewhere. Problems

you may encounter include the following:

• None of the LEDs light when the MTA1 28ST/NT is on.

• The MTA1 28ST/NT does not respond to commands.

• The MTA128ST/NT dials but cannot make a connection.

• You can place data calls but not voice calls, or vice versa.

• You cannot place two simultaneous data calls.

• The MTA1 28ST/NT disconnects while online.

• The MTA1 28ST/NT cannot connect when answering.

• File transfer appears slower than it should be.

• Data is being lost.

• There are garbage characters on the monitor.

If you experience problems, please check the following possibilities before calling Tech Support (see

Chapter 7).

Specific Troubleshooting Situations

SITUATION 1: The !Hn and *!Hn commands can be very useful for certain RAS environments that require at

least 1 second to initialize a port after a call has disconnected (such as Citrix and Novell). For example, when

a call disconnects, Citrix and Novell will begin initializing the port that just disconnected. However, it typically

takes more than 1 second and during that time a call may be received by the digital or analog

port. When this happens, Citrix and Novell do not answer the call nor do they finish the initialization

process. To prevent this problem, setting !H5 and/or *!H5 will set the TA to hold of digital and/or analog

calls for 5 seconds after the respective port(s) disconnect(s). This should give enough time for the digital

and/or analog port to be initialized by Citrix or Novell and enter the “waiting for a call” state.

SITUATION 2: The autobauding code cannot differentiate between 7 data bits, no parity, 1 or 2 stop bits

(7N1 or 7N2) and 7 data bits, mark parity, 1 or 2 stop bits (7M1 or 7M2). The TA assumes 7 data bits, mark

parity, 1 stop bit (7M1) and this case covers 7N1, 7N2, 7M1 and 7M2. However, if for some reason the

assumption of 7M1 causes a problem, then there is a workaround. The addition of the %S3 command and

use of $SBn, @P3=n, @P4=n, and @P6=n will help work around this limitation. See the description for the %Sn

command.

SITUATION 3: The autobauding code cannot differentiate between 8 data bits, no parity, 1 or 2 stop bits

(8N1 or 8N2) and 7 data bits, space parity, 1 or 2 stop bits (7S1 or 7S2). The TA assumes 8 data bits, no

parity, 1 stop bit (8N1) and this setting covers 7S1, 7S2, 8N1 and 8N2. However, if for some reason the

assumption of 8N1 causes a problem, then there is a workaround. The addition of the %S3 command and

use of $SBn, @P3=n, @P4=n, and @P6=n will help work around this limitation. See the description for the

%Sn command.

SITUATION 4: The autobauding code does not report the number of stop bits. This may become a problem if

the terminal is expecting a certain number of stop bits. The addition of the %S3 command and use of $SBn,

@P3=n, @P4=n, and @P6=n will help work around this limitation. See the description for the %Sn command.

Troubleshooting

Debugging/Logging/Troubleshooting Commands

The AT commands in this section can be used in attempting to troubleshoot or debug a current problem.

Some commands may be enhanced or limited by the debugging/logging/troubleshooting S-registers. For

complete descriptions of the commands and S-registers, see the additional documents on this CD.

Debugging/Logging/Troubleshooting Command Summary AT

Command Function

>Dn Embedded Protocol Analyzer (EPA)

*FSn Reset TA

*Ln Fatal Error Information

>LOG Display Logging Buffer Contents

>Sn Logging Variables

>TIME Display Current Timestamp

*V Various State Information

Debugging/Logging/Troubleshooting S-Registers

The S-registers in this section can be used in attempting to troubleshoot, debug, or even correct a current

problem. Some S-registers modify functionality of various features. Some S-registers modify the

functionality of the debugging/logging/troubleshooting commands described in the additional documents on

the system CD.

Debugging/Logging/Troubleshooting S-Register Summary

S-register Function

S47 Pulse-dial Maximum Break Pulse Period

S48 Pulse-dial Maximum Interdigital Pause

S72 EuroISDN Variant

S90 Local PPP Capabilities

S91 Remote PPP Capabilities

S92 Channel ID Information Element Octet 3 Settings

S93 Blacklisting

S94 Minimum Buffer Space After Trigger

S95 Logging Buffer Functionality

S96 Decode (EPA) Buffer Functionality

S98 ISDN_MSG Size

S99 Startup Options

S100 Flow Control High Threshold

S101 Flow Control Low Threshold

S102 Data to Save for Decoding

None of the LEDs light when the MTA128ST/NTis on

When you turn on the MTA128ST/NT, the LED indicators on the front panel should flash briefly as the TA

runs a self-test. If the LEDs remain off, the TA probably is not receiving power.

• Make sure the MTA128ST/NT’s power switch is on, especially if you normally turn on the TA by

turning on a power strip.

• If the power supply is plugged into a power strip, make sure the power strip is plugged in and its

power switch is on.

• Make sure the power supply module is firmly connected to the MTA128ST/NT and to the wall outlet

or power strip.

• If the power strip is on and the MTA1 28ST/NT is switched on, try moving the TA’s power supply to

another outlet on the power strip.

• Test that the outlet is live by plugging a lamp into it.

Troubleshooting

• The MTA1 28ST/NT or power supply may be defective. If you have another Multi-Tech MTA1 28ST/NT, try

swapping MTA128ST/NTs. If the problem goes away, the first MTA128ST/NT or power supply may be

defective. Call Tech Support for assistance.

Caution: Do not under any circumstances replace the power supply module with one designed

for another product, as it may damage the MTA1 28ST/NT and void your warranty.

The MTA128ST/NT does not respond to commands

• Make sure the MTA1 28ST/NT is plugged in and turned on. (See None of the LEDs Light When the

MTA 128S T/NT Is On.)

• Try resetting your MTA128ST/NT by turning it off and on.

• Make sure you are issuing the MTA128ST/NT commands from the data communications software, either

automatically, or manually in terminal mode. (You cannot send commands to the MTA1 28ST/NT from the

DOS prompt.)

• Make sure you are in terminal mode in your data communications program. Then type AT and press

ENTER. If you get an OK response, your connections are good and the problem likely is in your

phonebook entry or session settings.

• If you don’t get an OK, the problem may still be in the communications software. Make sure you have

done whatever is necessary in your software to make a port connection. Not all communications pro-

grams connect automatically to the COM port. Some connect when the software loads and remain

connected until the program ends. Others, like MultiExpress Terminal, can disconnect without ending the

program (make sure the Connect icon looks plugged in). MultiExpress Terminal also allows multiple

terminals to be open, but only one can access the MTA128ST/NT at a time. If MultiExpress Terminal

reports that it cannot make a connection, yet the MTA128ST/NT’s TR indicator is on, click on the Window

menu to see if more than one terminal is open. The MTA128ST/NT’s TR indicator shows that the

software has made a connection with the TA through the COM port.open, but only one can access the

MTA128ST/NT at a time. If MultiExpress Terminal reports that it cannot make a connection, yet the

MTA128ST/NT’s TR indicator is on, click on the Window menu to see if more than one terminal is open.

The MTA128ST/NT’s TR indicator shows that the software has made a connection with the TA through

the COM port.

• Your communications software settings may not match the physical port the MTA128ST/NT is connected

to. The serial cable may be plugged into the wrong connector—check your computer documentation to

make sure. Or you may have selected a COM port in your software other than the one the MTA1 28ST/

compare the settings in your software to the physical connection.

• If the MTA1 28ST/NT is on, the cable is plugged into the correct port, the communications software is

configured correctly, and you still don’t get an OK, the fault may be in the serial cable. Make sure it

is firmly connected at both ends.

• Is this the first time you have used the cable? If so, check the cable description on the packaging to

make sure the cable is correct for your computer.

• Peripheral expansion cards, such as bus mouse and sound cards, may include a serial port preconfig-

ured as COM1 or COM2. The extra serial port, or the card itself, may use the same COM port, memory

address, or interrupt request (IRQ) as your communications port. Be sure to disable any unused ports.

To look for address or IRQ conflicts, select File, Run in Program Manager, type MSD, and press ENTER.

Then select Mouse, COM Ports, and IRQ Status and note the addresses and IRQs that are in use. If you

find an IRQ conflict, note which IRQs are not being used, then change one of the conflicting devices to

use one of the unused IRQs. If you find an address conflict, change the address of one of the conflicting

devices.

To change a port address or IRQ, double-click the Control Panel icon, then the Ports icon. Click on the port you

want to change, click Settings, click Advanced, and select the new port address and/or interrupt. If you

wish to use COM3 or COM4, note that COM3 shares an IRQ with COM1, as does COM4 with COM2, so

Troubleshooting

you should change their IRQs to unused ones, if possible.

Right-click on My Computer, select Properties from the menu, click on the Device Manager tab, double-click on

Ports, then double-click on the Communications Port your MTA1 28ST/NT is connected to. In the port’s

Properties sheet, click on the Resources tab to see the port’s Input/Output range and Interrupt Request.

If another device is using the same address range or IRQ, it will appear in the Conflicting Device List.

Uncheck Use Automatic Settings to change the port’s settings so they do not conflict with the other

device, or select the port the conflicting device is on and change it instead. If you need to open your

computer to change switches or jumpers on the conflicting device, refer to the device’s documentation.

• The serial port may be defective. If you have another serial port, install the MTA1 28ST/NT on it, change

the COM port setting in your software, and try again.

• If using serial rates above 115,200 baud, make sure the serial port can handle higher rates. Most

standard serial ports have a maximum serial rate of 115,200. To handle serial rates of 230,400 baud and

460,800 baud, you need a high-speed serial port Even though some terminal emulation programs allow

you to select higher rates, the serial ports cannot always handle those rates.

• The MTA1 28ST/NT may be defective. If you have another Multi-Tech MTA1 28ST/NT, try swapping

MTA1 28ST/NTs. If the problem goes away, the first MTA1 28ST/NT is possibly defective. Call Tech

Support for assistance (see Chapter 7).

The MTA128ST/NT dials but cannot make a connection

There can be several reasons the MTA128ST/NT fails to make a connection. Possibilities include

• Lack of a proper physical connection to the communication line.

• A busy signal.

• Awrong number.

• No terminal adapter at the other end.

• A faulty communications device, computer, or software at the other end.

• Incompatibility between communications devices.

• An improperly configured MTA128ST/NT.

Narrow the list of possibilities by using extended result codes. To enable them, enter ATV1X2 and press

ENTER while in terminal mode or include V1X2 in the MTA128ST/NT’s initialization string (V1X2 is

enabled by default). When you dial again, the MTA128ST/NT reports the call’s progress.

• If the MTA128ST/NT reports NO DIALTONE, check that the ISDN S/T cable is securely connected to

both the TA’s ISDN jack (not the PHONE jack) and the ISDN network terminator or wall jack. If the cable

looks secure, try replacing it. If that doesn’t work, the problem may be in your building’s telephone

installation. Make sure ISDN cables on all devices are wired straight-through (pin 1 to pin 1, pin 2 to pin 2,

etc.) and do not have reversed pairs. The cable must have at least the middle four pins (pins 3, 4, 5, and

6) connected. A reversed pair on the U (phone company) side is not important, but a reversed pair on the

S/T (your) side can create problems if you have more than one device, since multiple devices attached to

the S/T interface must all have the same polarity.

• If the MTA1 28ST/NT reports BUSY, the other number may be busy, in which case you should try again

later.

• If the MTA1 28ST/NT reports NO CARRIER, no connection was made. You might have dialed the correct

number but the other computer or software was turned off or faulty. Check the number and try again, or

try calling another system to make sure your TA is working. Also, check that you accurately configured

the TA with the correct switch type, TEIs, data protocols, and other parameters needed for a successful

call (see Chapter 3).

You can place data calls but not voice calls or vice versa

• You might not have ordered both voice and data service from your ISDN provider. Check your contract or

latest statement of service from your ISDN provider.

• Your ISDN provider may have programmed the switch incorrectly. Call the provider.

Troubleshooting

You cannot place two simultaneous data calls

• You may not have ordered an ISDN line configuration that supports two simultaneous calls. Check your

contract or latest statement of service from your ISDN provider. Also, your ISDN provider may have

programmed the switch incorrectly. Call the provider.

• You may have misconfigured your MTA128ST/NT to dial two simultaneous data calls. The command

AT&J1&W0<cr> is used to indicate whether outgoing calls should be made on two B-channels by default.

• You may be using the wrong bundling dial modifier (e.g., ATD7853500&7853502<cr>). The ampersand in

this command string is correct. Other valid characters joining two telephone numbers include a plus sign

(+) and an exclamation mark (!).

Note: In Windows 98/NT/ME, if the Use Country Code and Area Code box is checked in the Properties

window for dial-up connection, the bundling modifier (i.e., &, + or!) is removed from the dialing string

when the user attempts to make a connection. The solution is not to check the Use Country Code and Area

Code box or to simply add the bundling dial modifier to the phone number at the time of connection.

The MTA128ST/NT disconnects while online

• Check for loose connections between the MTA128ST/NT and the computer, the ISDN jack, and AC

power.

• The problem may have originated at the other end of the line. Try again.

• If you were online with a BBS or online service, it may have hung up on you because of lack of activity

on your part or because you exceeded your time limit for the day. Try again.

The MTA128ST/NT cannot connect when answering

• Autoanswer may be disabled. Turn on autoanswer in your data communications program or send the

command ATS0=1 to your MTA128ST/NT in terminal mode.

Note: If the user wishes to accept calls while DTR is low, the MTA1 28ST/NT must be

configured to ignore DTR. This is accomplished by entering AT&D0<cr>. With this configuration,

the MTA128ST/NT is able to accept calls while DTR is low. If this configuration setting is not made,

the TA rejects incoming calls until DTR is high while the calls comes in.

File transfer appears slower than it should be

• If you have a Universal Asynchronous Receiver/Transmitter (UART) that is compromising

data throughputs, we recommend replacing it with a special I/O card.

• If you are running under Windows 3.1 and have a 1 6550AFN UART, replace the Windows serial driver,

COMM.DRV, to take full advantage of the UART’s speed.

• Check the serial port baud rate in your communications software, and make sure it is set as high as

your UART allows.

Data is being lost

• Your UART may not be reliable at serial port speeds over 9600 bps or 19,200 bps. Reset your serial port

speed to a lower rate, or replace your serial port with a faster one.

• Check the serial port baud rate in your communications software, and make sure it is set as high as your

UART allows.

• Make sure the flow control method you selected in software matches the method selected in the

MTA1 28ST/NT.

Garbage characters appear on the monitor

Your computer and the remote computer may be set to different parities. Check with the remote system

and set your communications software to use the same parity as the remote system.

Making a V.120 call, caller gets a NO CARRIER message after dialing the number.

Some switches don’t support ISDN SETUP messages that contain a LLC (low layer compatibility)

element. When these switches receive an LLC in the SETUP, they immediately reject the call and a NO

CARRIER message displays. Disable LLC for V.120 calls by issuing the command AT!D0=0. To enable

LLC again for V.120 calls, issue the command AT!D0=1 (the default setting).

Troubleshooting

When using X.75 data protocol to transfer data via the Zmodem, the Zmodem displays Intermittent bad

packet errors and data throughput drops.

This occurs in cases when the X.75 packet size is greater than 1024 bytes and the terminal adapter

sending the file has a fast serial baud rate (e.g., 115200 bps) and the terminal adapter receiving the file

has a slow serial baud rate (e.g., 19200 bps). To reduce or possibly eliminate this, reduce the X.75 packet size

(S53) to a value less than or equal to 102 bytes (e.g., ATS53=512). However, if you set the receiving terminal

adapter’s serial baud rate nearly equal to or greater than the serial baud rate of the sending terminal

adapter, then the packet size can be greater than 1024, and Zmodem transfers the data without bad packet

errors.

The MTA128ST/NT won’t accept V.120 calls from a 3Com Impact IQ terminal adapter. The Impact IQ

displays a connected status, but the MTA128ST/NT does not.

The MTA128ST/NT is looking for a SABME command from the Impact IQ to finish establishing the V.120

connection. However, the Impact IQ won’t send a SABME until it has data to send. Have the Impact IQ

send a character by pressing any key (such as the space bar) on the terminal attached to the Impact IQ. The

MTA128ST/NT responds with a CONNECT message and displays the key you pressed (e.g., a space).

MTA128ST/NT receives garbage characters when connected to a 3Com Impact IQ terminal adapter.

Most likely, the Impact IQ has compression turned on. The compression used by the Impact IQ is

incompatible with the compression used by the MTA1 28ST/NT. Disconnect the data connection and give

the Impact IQ the command AT%CO and then establish the data connection again. The garbage

characters should disappear.

The MTA128ST/NT receives garbage characters after receiving several good characters when connected

to a 3Com Son ix adapter.

Most likely, the Sonix has compression turned on. The compression used by the Sonix is incompatible with

the compression used by the MTA1 28ST/NT. Disconnect the data connection and the give the Sonix the

command AT”HO (that’s a double quote) and then establish the data connection again. The garbage

characters should disappear.

Each time a 3Com Sonix terminal adapter originates a V.120 call, the MTA128ST answers the call as a

V.110 call.

The Sonix sends V.1 10 information in the SETUP message to the network. Since the MTA128ST’s default

is with Auto Protocol Detection enabled (ATS52=1), it looks at SETUP information from the Sonix and

determines erroneously that it is a V.1 10 call. Disable Auto Protocol Detection in the MTA128ST with the

command ATS52=0 and try the connection again.

The MTA128ST/NT won’t connect to an ELSA terminal adapter with the V.120 data protocol.

Most likely, the ELSA terminal adapter has compression turned on. The compression used by the ELSA

terminal adapter is incompatible with compression used by the MTA128ST/NT. Give the ELSA the

command AT%CO to disable compression and try again.

Apple Macintosh Compatibility

The IWay Hopper works with all Macintosh models with a serial port. Some models may require a USB-to-

serial adapter since the MTA1 28ST/NT is a serial RS-232 device. Scripts are provided for Mac OS 8

through Mac OS X. These scripts also work with Mac OS 7.x with the Apple Internet Connection Kit

installed. (OS 8 and 8.1 have the Apple Internet Connection Kit built-in and Mac OS 8.5 through Mac OS X

have Internet connection capabilities built-in.) If you don’t use the Internet connection abilities provided by the

Mac OS, then you will need to create your own initialization string to suit your needs. Generally, these

initialization strings can be based on the Factory Profile command &Fn to set up the desired protocol.

PPP/MLPPP

Chapter 6: Point -t o-Point Communications: PPP/MLPPP

Bonding Using the &, I and + Characters

You can use the &, ! and + characters to bond two channels together when performing channel bonding

(available only with the MLPPP protocol).

When you use the &, +, or! characters with the MLPPP protocol, the TA regards the number following that

character as a second phone number. When used with MLPPP, the TA first dials the number given before

the &, +, or! character. After establishing the LCP (Link Control Protocol) and authenticating (if

requested), the TA dials the second number (the number after the &, +, or! character).

This is an alternative method to set up a MultiLink PPP call as opposed to using the &J1 command, which

dials the given number twice rather than dialing two different numbers.

Example: ATD5551000&5553000 dials 5551000 first, sets up the LCP and authenticates, and then dials

5553000 and sets up the LCP and authenticates on the second B-channel (thus setting up an MLPPP

call).

Note: Using these characters with any protocol other than the PPP/MLPPP protocol does not result in the

use of two B-channels at this time.

Making PPP/MLPPP Connections

Making a PPP or MLPPP connection is not as simple as using a terminal emulation program and dialing one

or two phone numbers. Using the PPP data protocol provided by the TA (!Z=9) requires that the TA receives

PPP-formatted data from the terminal. If the TA does not receive PPP-formatted data, the data is discarded by

the TA and never sent to the peer. The TA can receive PPP-formatted data from the peer and send it to the

terminal, but if it is sending the data to a terminal emulation program running on the terminal, the data

appears as garbage.

The PPP data protocol requires PPP data to be sent from the terminal in order for the data to be sent to the

other side. The MultiLink protocol requires the PPP protocol to establish itself on one B-channel before the

second channel is dialed. The LCP can be established only if data is sent by the terminal to the TA.

Negotiation actually occurs between the local terminal and the remote peer. The TA simply views the

negotiation, so it knows how to negotiate on the second B-channel. When the second B-channel connects, the

local terminal is unaware and doesn’t participate in the LCP negotiation. Therefore, the TA must mimic the

negotiation that was witnessed on the first channel.

For example, sending ATDT5551000&5553000 from a terminal emulation program to the TA does NOT

cause the TA to dial two channels and bring up the 128K LED. However, if that dial command was given by

Windows Dial-Up Networking, for example, then there is a chance that the TA dials two channels and

brings up the 128K LED if the user name and password are correct, if the IP address is okay, and if the

peer allows a MultiLink connection. If MultiLink is not allowed, then the TA uses one channel for the PPP

connection. If the user name or password are invalid or incorrect, the connection is terminated. If an IP

address is in conflict, the connection is terminated as well.

Software Applications that can Format PPP Data

Software applications that can format PPP Data for Microsoft-compatible PCs include Windows Dial-Up

Networking (DUN) and WinSock.

Software applications that can format PPP Data for Apple Macintoshes include OT/PPP, MacPPP,

FreePPP, GearBox, and pppd via Internet Connect (Mac OS X).

Dynamic Bandwidth Allocation (DBA)

Dynamic Bandwidth Allocation (DBA) supports the addition and removal of data channels according to the

level of throughput through the TA and according to analog POTS port use.

If throughput is above a given threshold, a second data channel is added to facilitate higher throughput.

If throughput drops below a given threshold, the second channel is removed to save the cost of having the

second B-channel active but not fully used.

PPP/MLPPP

MTA128ST/NT 39

If an outgoing analog call is desired or there is an incoming analog call, a data channel can be bumped

(removed) to allow analog POTS port use.

Bandwidth-on-Demand (BOD) checks the data throughput to determine whether a channel should be

added or removed.

Call Bumping (CB) determines whether a channel needs to be added again (analog call disconnected) or

removed (incoming or outgoing analog call desired) due to activity on the analog POTS port.

To activate Bandwidth-on-Demand or Call Bumping, enable Dynamic Bandwidth Allocation in S-register S59.

The 128 LED flashes if DBA is active and only one data channel is connected. The 128 LED stops flashing

and remains on after the second B-channel is successfully added. If the second channel is disconnected

due to low throughput or a call-bump, the 128 LED flashes again to indicate that DBA is still active.

If the TA attempts to add a B-channel, but the host is busy or not answering, the TA starts a timer (time is set

in S-register S31). However, if the analog device goes off-hook or an analog call is received, the timer is

stopped and reset. After the analog call finishes, the TA again attempts to add the B-channel. Taking the

analog device off-hook and placing it on-hook again interrupts the timer, thus allowing control over the

amount of time it takes before attempting to add the second channel (rather than waiting for timeout values

specified by S31).

DBA Data Protocols

MLPPP is the only data protocol that currently supports DBA. To start DBA, set &J1 or give two numbers

to be dialed. Otherwise, the TA will not negotiate the MultiLink Protocol (MP) option. If the MultiLink

Protocol option is not negotiated, Dynamic Bandwidth Allocation is not possible.

DBA Features:

Bandwidth-on-Demand (BOD)—S60, S61, S62, and S63

• Bandwidth-on-Demand (BOD) is not available to the host TA if Dynamic Bandwidth Allocation is disabled

(S59=0) or if the Dynamic Bandwidth Allocation scheme is PPP (S59=2).

• Setting S60=0 disables the BOD feature completely (meaning S61, S62, and S63 are disabled as well).

• To calculate High Throughput Average (in Kbps):

– Divide the total number of bits received from the PC (not including start, stop, or parity bits) during

the High Threshold Sampling Period (S60) by the High Threshold Sampling Period (S60) value (in

Kbps).

Total bits received  S60 = High Throughput Average

– Or, divide the total number of bits transmitted to the PC (don’t include start, stop, or parity bits) during

the High Threshold Sampling Period (S60) by the High Threshold Sampling Period (S60) value (in

Kbps).

Total bits transmitted  S60 = High Throughput Average

If the average (transmitted or received) exceeds the High Threshold (S61) and only one data channel is

active and the second B-channel is not already in use, the TA attempts to add a second data channel.

• To calculate Low Throughput Average (in Kbps):

– Divide total number of bits received from the PC (not including start, stop, or parity bits) during the

Low Threshold Sampling Period (S62) by the Low Threshold Sampling Period (S62) value (in Kbps).

Total bits received  S62 = Low Throughput Average

– Or, divide total number of bits transmitted to the PC (not including start, stop, or parity bits) during the

Low Threshold Sampling Period (S62) by the Low Threshold Sampling Period (S62) value (in Kbps).

Total bits transmitted  S62 = Low Throughput Average

If either average (transmitted or received) equals or is less than the Low Threshold (S63) and there are

two active data channels, the TA disconnects the second data channel.

• Ideally, the second channel should be added quickly (short High Threshold Sampling Period [S60] with a

relatively small High Throughput Threshold [S61]). Also, the second channel should not be disconnected

PPP/MLPPP

for a relatively long period of time (long Low Threshold Sampling Period [S62] with a small Low

Throughput Threshold [S63]).

• If data transmits or is received in bursts and the TA adds and removes a channel too quickly,

increase the High Threshold Sampling Period (S60) and the Low Threshold Sampling Period (S62) and

– decrease the Low Throughput Threshold (S63).

Call Bumping (S-register S64)

• Call Bumping is not available to the host TA if Dynamic Bandwidth Allocation is disabled (S59=0) or if

the Dynamic Bandwidth Allocation scheme is PPP (S59=2).

• If the analog device goes off-hook or there is an indication of an incoming analog call and both B-

channels are in use by a data call, the TA drops the second B-channel and rings the analog device.

• If the analog device goes on-hook or the peer disconnects the analog call, the TA adds the second B-channel

again according to whether BOD is enabled or disabled (S60). If BOD is disabled (S60=0), the second

channel is added immediately. If BOD is enabled (S60 is non-zero), the second channel is added after the

High Threshold Sampling Period (S60) and High Throughput Threshold (S61) determine whether

throughput is high enough to allow adding the second channel.

Warranty, Service, and Tech Support

Chapter 7: Warranty, Service, and Tech Support

Multi-Tech Systems, Inc. Warranty & Repairs Policies

Warranty

Multi-Tech Systems, Inc., (hereafter “MTS”) warrants that its products will be free from defects in material or

workmanship for a period of two, five, or ten years (depending on model) from date of purchase, or if proof

of purchase is not provided, two, five, or ten years (depending on model) from date of shipment.

MTS MAKES NO OTHER WARRANTY, EXPRESS OR IMPLIED, AND ALL IMPLIED WARRANTIES OF

MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED.

This warranty does not apply to any products which have been damaged by lightning storms, water, or power

surges or which have been neglected, altered, abused, used for a purpose other than the one for which they

were manufactured, repaired by Customer or any party without MTS’s written authorization, or used in any

manner inconsistent with MTS’s instructions.

MTS’s entire obligation under this warranty shall be limited (at MTS’s option) to repair or replacement of any

products which prove to be defective within the warranty period or, at MTS’s option, issuance of a refund of

the purchase price. Defective products must be returned by Customer to MTS’s factory – transportation

prepaid.

MTS WILL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES, AND UNDER NO CIRCUMSTANCES

WILL ITS LIABILITY EXCEED THE PRICE FOR DEFECTIVE PRODUCTS.

Repair Procedures for U.S. and Canadian Customers

In the event that service is required, products may be shipped, freight prepaid, to our Mounds View,

Minnesota factory:

Multi-Tech Systems, Inc.

2205 Woodale Drive

Mounds View, MN 55112

Attn: Repairs, Serial #_____________

A Returned Materials Authorization (RMA) is not required. Return shipping charges (surface) will be paid

by MTS in U.S. and Canada.

Please include, inside the shipping box, a description of the problem, a return shipping address (must

have street address, not P.O. Box), and your telephone number. If the product is out of warranty, a payment in

advance is required. Acceptable means of payment include credit card, wire transfer or a check in

U.S.dollars drawn on a U.S. bank.

For out of warranty repair charges, go to COMPANY/Policies/warranty/

Extended two-year overnight replacement service agreements are available for selected products. Please call

MTS customer service at (888) 288-5470, or visit our web site at

/PARTNER/Programs/overnight replacement/ for details on rates and coverages.

Please direct your questions regarding technical matters, product configuration, verification that the product

is defective, etc., to our Technical Support department at (800) 972-2439 or email

support@multitech.com. Please direct your questions regarding repair expediting, receiving, shipping,

billing, etc., to our Repair Accounting department at (800) 328-9717 or (763) 717-5631, or email

mtsrepair@multitech.com.

Repairs for damages caused by lightning storms, water, power surges, incorrect installation, physical

abuse, or user-caused damages are billed on a time-plus-materials basis.

Warranty, Service, and Tech Support

Repair Procedures for International Customers (Outside U.S.A. and Canada)

Your original point-of-purchase Reseller may offer the quickest and most economical repair option for

your Multi-Tech product. You may also contact any Multi-Tech sales office for information about the

nearest distributor or other repair service for your Multi-Tech product. The Multi-Tech sales office

directory is available at http://www.multitech.com/partners/channels/offices/

In the event that factory service is required, products may be shipped, freight prepaid to our Mounds View,

Minnesota factory. Recommended international shipment methods are via Federal Express, UPS or DHL

courier services, or by airmail parcel post; shipments made by any other method will be refused. Please

include, inside the shipping box, a description of the problem, a return shipping address (must have

street address, not P.O. Box), and your telephone number. If the product is out of warranty, a payment

in advance is required. Acceptable means of payment include credit card, wire transfer, or a check

in U.S. dollars drawn on a U.S. bank. Repaired units shall be shipped freight collect, unless other

arrangements are made in advance.

Please direct your questions regarding technical matters, product configuration, verification that the

product is defective, etc., to our Technical Support department nearest you or email

support@multitech.com. When calling the U.S., please direct your questions regarding repair expediting,

receiving, shipping, billing, etc., to our Repair Accounting department at (763) 717-5631 in the U.S.A., or

email mtsrepair@multitech.com.

Repairs for damages caused by lightning storms, water, power surges, incorrect installation, physical abuse,

or user-caused damages are billed on a time-plus-materials basis.

Repair Procedures for International Distributors

International Distributors should contact their MTS International sales representative for information about the

repair of Multi-Tech product(s).

Please direct your questions regarding technical matters, product configuration, verification that the

product is defective, etc., to our International Technical Support department (763) 717-5863. When calling the

U.S., please direct your questions regarding repair expediting, receiving, shipping, billing, etc., to our Repair

Accounting department at (763) 717-5631 in the U.S.A., or email mtsrepair@multitech.com.

Repairs for damages caused by lightning storms, water, power surges, incorrect installation, physical

abuse, or user-caused damages are billed on a time-plus-materials basis.

Replacement Parts

SupplyNet, Inc., can supply you with replacement power supplies, cables and connectors for selected

Multi-Tech products. You can place an order with SupplyNet via mail, phone, fax or the Internet at the

following addresses:

Mail: SupplyNet, Inc.

614 Corporate Way

Valley Cottage, NY 10989

Phone: 800 826-0279

Appendice

MTA128ST/NT 43

AppendixA:Configuration Profiles

Quick Setup Factory Profiles

For quick setup, the MTA1 28ST/NT includes six Quick Setup Factory Profiles, each of which is configured for a

specific type of port operation. You can load a Quick Setup Factory Profile into active memory by using the

command &Fn, in which n is the number of the profile you wish to load. If you wish, you can then customize the

profile and store it, using the &Wcommand, so that it loads automatically when the MTA1 28ST/NT is turned

on or reset. These profiles are stored in permanent memory and are not user-configurable as such.

MTA1 28ST

&F0 Profile 0—Modem-like operation (default)

&F1 Profile 1—V. 110 async operation

&F2 Profile 2—V.120 async operation

&F3 Profile 3—X.75 async operation

&F4 Profile 4—ML-PPP async operation

&F5 Profile 5—SoftBonding Asynchronous Operation

&F6 Profile 6—HDLC Asynchronous Operation

&F7 Profile 7—CLEAR operation

MTA1 28NT

&F0 Profile 0–Modem-Like Asynchronous Operation

&F1 Profile 1–V.120 Asynchronous Operation

&F2 Profile 2–X.75 Asynchronous Operation

&F3 Profile 3–PPP Asynchronous Operation

&F4 Profile 4–SoftBonding Asynchronous Operation

&F5 Profile5–HDLC Asynchronous Operation

&F6 Profile 6–CLEAR Asynchronous Operation

Quick Setup Example

The following procedure assumes that you want to load, modify, and store Quick Setup Factory Profile 2 as

your default configuration.

1. Select the profile closest to the requirements of your application, in this case— Quick Setup Factory

Profile 2.

2. In terminal mode, type AT&F2 and press ENTER. Quick Setup Profile 2 loads into the MTA128ST/NT’s

active memory.

3. Enter any additional AT commands that you need to customize the selected profile to your application

(see Chapter 4, AT Commands, S-Registers, and Result Codes).

4. Type AT&W0 and press ENTER to save your customized port configuration.

5. Your customized profile now loads automatically whenever the MTA128ST/NT is turned on or reset.

Appendices

Appendix B: Ordering Your ISDN Li ne

There are two ways to specify your ISDN line configuration to your service provider. One is by using ISDN

"ordering codes" in which the user, the Local Exchange Carrier (LEC) or Internet Service Provider (ISP)

are using common nomenclature to describe elements of service. The other way of ordering service is to

use a “building block approach”; where the naming conventions are non-standardized, and the user and

provider must establish a set of provisioning options.

Loop Qualification

The first step in ordering (“provisioning”) an ISDN BRI line is to contact your LEC and verify ISDN BRI

loop availability in your location. There is a distance limitation of approximately 2 miles (1800Kf) from the

BRI loop. Each request for BRI is handled on a case-by-case basis. Once qualified, the LEC requires

information on the type of equipment and protocol used. Most ISDN BRI is configured as “voice and data” (due

to the fact that the LEC network is primarily analog, and ISDN digital technology converts the digital signal into

analog, transports it over their analog lines, and then re-converts it into digital data at the other end).

As a general procedure when ordering an ISDN BRI (2B+D) line:

1. Plan ahead; the BRI line order may take four weeks or more to get provisioned.

2. Contact your LEC representative early in the process toensure ISDN BRI loop availability for your

location.

3. Provide the LEC rep. with your correct address for the BRI service.

4. Provide the LEC rep. with the type of equipment (e.g., “Multi-Tech MTA128TA External ISDN

Terminal Adapter”) and the protocol specifications that it supports. Use the “ISDN BRI

(2B+D) Line Ordering Checklist” provided later in this document for the protocol

specifications.

5. Provide the LEC rep. with the type of jack required by the MTA128NT (i.e., “RJ45 male 2-wire U

Basic Rate Interface”).

6. Wait for notification of installation from the LEC; ask the LEC rep what type of switch is used

(AT&T 5ESS and NT DMS-100 are most prevalent).

7. Ensure availability of an “auxiliary” analog line (if you plan on using the MTA1 28NT’s “AUX”

RJ1 1 analog connector for a standard telephone connection). Make sure you have a 115

VAC (60 Hz) power outlet near your computer for the MTA1 28NT’s two-prong outlet-mounted

power transformer.

8. Record all of the information provided by your LEC.

Bearer Service

The options of Circuit Switch Voice Bearer (CSV) and Circuit Switch Data Bearer (CSD) are broad

categories of Bearer Services that the phone companies can provide. Different bearer services

provide different types of guarantees about the reliability and synchronization of the data. There are

currently ten different bearer services for circuit-mode, and three services for packet mode.

These bearer services are defined in terms of a number of attributes, which include mode (circuit or

packet), structure (bit-stream or octet-stream), transfer rate (e.g. 64Kbps), transfer capability (basically,

the content, for instance speech, 7Khz audio, video, or unrestricted), and several other attributes that

specify protocols to use and other things.

The attributes of the bearer service are encoded into a Bearer Code, or BC, that is sent everytime a

new connection is being set up. In theory, this allows the switches to dynamically choose from a

variety of different switching paths techniques depending on requirements. In practice, the

SPID is used to determine what services are needed for switching, as this greatly simplifies things for

the telephone companies. The Bearer Code will not be completely ignored, however there are

certain bearer services that will be unavailable on your B-channels, based on how they are

configured. It is important to note that the Bearer Code is sent to the switch every time a connection

is established. However, the SPID is only sent to the switch when you physically attach your

Appendices

equipment to your phone line. At this time the switch gives your device a Terminal Equipment

Identifier (TEI) which is used from then on to identify all connection requests from that piece of

equipment. This allows the switch to look at the TEI and Bearer Code, determine the SPID, and see if

the Bearer Code and the SPID match up.

Using ISDN Ordering Codes (IOCs)

An organization called ISDN Solutions Group, made up of ISDN service providers and

equipment vendors, was formed to simplify the often complex task of ordering an ISDN line. This

method, supported by most (but not all) service providers, uses ISDN ordering codes to define the

ISDN line configuration. Your ISDN TA has been tested to operate with the following ordering codes:

B1, Capability C, Capability R, I2, J2, J3, Capability S, and M5, as described in the following sections.

B1 (previously 'Generic Data B')

This ISDN line ordering code supports:

• 1 B Service,

• Data only on 1 B channel, and

• One directory number.

Capability C (previously 'Generic Data C')

This ISDN line ordering code supports:

• 1 B Service,

• Alternate voice and data on one B channel, and

• One directory number.

Capability R (previously 'Generic Data I')

This ISDN ordering code supports:

• 2B Service,

• Data only on each B channel, and

• Two directory numbers.

Applications for Capability R include:

• 115.2K or 128K bps data only (no voice capability, and

• Generic 115.2K/1 28K bps data transfer applications (including remote access and LAN/WAN

connectivity and telecommuting).

I2 (previously 'Generic Data I-1DN')

This ISDN ordering code supports:

• 2B Service,

• Data only on each B channel, and

• One directory number.

I2 is not available on the Northern Telecom switch. Two directory numbers are required for 2B operation; in

this case use J2.

J2 (previously 'Generic Data J')

This ISDN ordering code supports:

• 2B Service,

• alternate voice and data on one B channel, data only on other B channel, and

• Two directory numbers.

Appendices

J3 (previously 'Generic Data J-1DN')

This ISDN ordering code supports:

• 2B Service,

• alternate voice and data on one B, data only on other B channel, and

• One directory number.

J3 is not available on the Northern Telecom switch. Since two directory numbers are required for 2B

operation, use J2.

Capability S (previously 'Generic Data M')

This ISDN ordering code is the recommended IOC since it supports the most features for voice and data

applications. However, ISDN tariffs in some areas may warrant ordering codes with fewer features (e.g.,

where there is an additional monthly charge for having voice service on both B channels). If yours is a

data only application, you may find Capability R more cost-effective.

Capability S supports:

• 2B Service,

• alternating voice/data on each B channel, and

• Two directory numbers.

Applications for Capability S include:

• 115.2K or 128K bps data,

• 56K/64K bps data with voice or modem support, and

• Generic 1 15.2K/1 28K bps data transfer applications (including remote access and LAN/WAN

connectivity and telecommuting).

M5 (previously 'Generic Data M-1DN')

This ISDN ordering code supports:

• 2B Service,

• alternate voice/data on each B channel, and

• One directory number.

M5 is not available for services provided with Northern Telecom or AT&T switches. Since two directory

numbers are required for 2B operation, use Capability S.

Appendices

Ordering ISDN Without IOCs

This section guides you and your telephone company in specifying and obtaining ISDN service when

IOCs are not used. To support most ISDN TA features, your telephone service must meet certain

requirements. These requirements are described in the following sections. Some features may be added or

deleted, depending on your actual data service needs and availability in your area. Before ordering, talk to

your telephone company about which of the services listed on the following pages are provided in your area.

The following form was created for you to complete and fax to your telephone company to request the

proper ISDN line for use with your ISDN TA module.

Name: ____________________________________________________

Address:

City: ________________________________ State:________________ ZIP Code:

Daytime Telephone Number: ______________

1. Request an ISDN BRI (Basic Rate Interface) line with:

• U-Interface Reference Point, and

• 2B1Q Line Coding.

2. Choose one of the following:

___ 2B+D Service (supports up to 128K bps), or

___ 1 B+D Service (supports up to 64K bps).

3. Indicate the ISDN Switch Type and Software Protocol you will be using:

___ AT&T 5ESS, with:

___ Custom,

___ 5E6 and later software, or

___ NI1 (National ISDN-1).

___ Northern Telecom DMS-100, with:

___ BCS-32 and later software (Pvc1), or

___ National ISDN-1 (Pvc2).

___ Siemens EWSD with National ISDN-1

4. Request that the ISDN line you are ordering allocates one dynamic TEI (Terminal Endpoint Identifier)

per phone number.

5. Order specific services for your particular ISDN Switch:

5a. AT&T 5ESS: request a line with:

Feature: Value

B1 Service: DMD (On Demand)

B2 Service: DMD (only if 2B+D ordered)

Data Line Class: PM (Point-to-MultiPoint)

Maximum B Channels: 2 (if 2B+D) or 1 (if 1 B+D)

Circuit Switched Voice (CSV) Bearer Channels: Any

CSV Calls: 1 (recommended for test purposes)

Number of Circuit Switched Data (CSD) Bearer Channels: Any

Number of CSD Calls: 2 (if 2B+D ordered), or 1 (if 1 B+D ordered)

Terminal Type: Type A Turn these features OFF:

Packet Mode Data

MultiLine Hunt

Multiple Call Appearances

Appendices

EKTS (Electronic Key Telephone Sets)

Shared Directory Numbers

Accept Special Type of Number

Intercom Groups

Modem Pools (Network Resource Selector)

Message Waiting

Hunting

I nterLATA Competition

5b. Northern Telecom DMS-100: request a point-to-multipoint line with:

Line Type: Basic Rate, Functional

Electronic Key Telephone Sets (EKTS): No

Call Appearance Handling (CACH): No

Non-Initializing Terminal: No

Circuit Switched Service: Yes

Packet Switched Service: No

TEI: Dynamic

Bearer Service: Circuit Switched Voice and Data Permitted on Any B Channel (Packet Mode Data not

permitted)

6.____________________________________________________ Select a long distance carrier; note here:

____________________________________________________

Contact the selected long distance carrier and request Circuit-Switched 64K bps Clear Channel Access

(if available).

8. Request that the telephone company provide ISDN TA configuring information (record here):

• ISDN Switch Type: ____________

• ISDN Switch Protocol Version: __

• ISDN Phone Number 1: ___________

• ISDN Phone Number 2: _______ (if 2B+D ordered)

• ISDN Line Type: _____________(point-to-point or multipoint)

• If MultiPoint, SPID Number 1: _______ (with prefix and suffix)

• If MultiPoint, SPID Number 2: ________ (with prefix and suffix)

9. If you will be using standard 5ESS or DMS-1 00, your protocol selection is complete. Fax the

information in steps 1-8 to your phone company. If you will be using 5ESS "Custom" or DMS-1 00 "Pvc1"

protocol support, continue with step 10a (5ESS Custom) or step 10b ( DMS-100 Pvc1).

10a. 5ESS Custom Line Additional Parameters

The AT&T 5ESS central office telephone switch supports a proprietary ISDN D-channel call control protocol

called "Custom" which is based on CCITT recommendations. The ISDN TA configured for switch type AT&T

5ESS will work with lines providing this protocol on 5ESS switches with software version 5E6 or later.

The ISDN TA supports the following configurations on 5ESS Custom lines:

• Point-to-Point with one phone number (recommended configuration with no POTS interface)

• Multipoint with one phone number

• Multipoint with two phone numbers (recommended configuration with POTS interface)

The requirements for the 5ESS line are shown below:

B1 Service: DMD (On-demand)

B2 Service: DMD (On-demand)

Data Class Line: PM (Point-to-MultiPoint) Max. B

Channels: 2

Appendices

Number of CSV Calls: 2

CSV Bearer Channels: Any

Number of CSD Calls: 2

Circuit Switched: Any

Terminal Type Bearer Channels: Type A

Multipoint lines require the phone company to create a SPID for each phone number on the line. With the exception of

the ability to spread two calls across two phone numbers, multipoint lines offer no special features, and may create

complications. However, if you use a multipoint line, the parameters are similar to the point-to-point lines, except

for the SPIDs.

The 5ESS switch can provide a variety of supplementary features which the ISDN TA may not support. Enabling

these features may have undesirable consequences.

Features to avoid are:

• Packet mode data

• Multiline Hunt Groups

• EKTS (Electronic Key Telephone Set)

• Shared directory numbers

• Intercom groups

• Modem Pools (Network resource selector)

• Message waiting

• Hunting

• Inter LATA competition

• Accept special type of number

10b. DMS-100 Pvc1 Line Additional Parameters

The Northern Telecom DMS-100 telephone switch supports a proprietary ISDN D-channel call control protocol

called Protocol Version 1 ("Pvc1") which is based on CCITT recommendations. The ISDN TA configured for switch

type DMS-100 will work with lines providing this protocol on DMS-100 switches with software version BCS-32 or later.

The ISDN TA supports the following configurations on DMS-100 Custom lines:

• Multipoint with one phone number (for 1 B+D service)

• Multipoint with two phone numbers (for 2B+D service)

The requirements for the DMS-100 multipoint line are defined in Local Interface Requirements, Local Service

Requirements, and below. Fax this information to your local phone company.

The line should have two service profiles with the parameters below, to support BONDING and the POTS port, if

installed.

Line Type: Basic rate, functional EKTS: No

CACH: No

Initializing terminal: Yes

Bearer services: Circuit-switched voice & data permitted (Packet mode data not permitted) Circuit-switched

service: Yes

Packet-switched service: No Protocol

version: Functional Pvc1 TEI: Dynamic

Appendices

AppendixC: FCCand Canadian Regulation

FCC

1. This equipment complies with Part 68 of the Federal Communications Commission (FCC) rules. On the

outside surface of this equipment is a label that contains, among other information, the FCC registration

number and ringer equivalence number (REN). If requested, this information must be provided to the

telephone company.

2. As indicated below, the suitable jack (Universal Service Order Code connecting arrangement) for this equipment is

shown. If applicable, the facility interface codes (FIC) and service order codes (SOC) are shown.

An FCC-compliant telephone cord and modular plug is provided with this equipment. This equipment is

designed to be connected to the telephone network or premises wiring using a compatible modular jack which is

Part 68 compliant. See installation instructions for details.

3. The ringer equivalence number (REN) is used to determine the quantity of devices which may be connected to

the telephone line. Excessive REN’s on the telephone line may result in the devices not ringing in response to an

incoming call. In most, but not all areas, the sum of the REN’s should not exceed five (5.0). To be certain of the

number of devices that may be connected to the line, as determined by the total REN’s, contact the telephone

company to determine the maximum REN for the calling area.

4. If this equipment causes harm to the telephone network, the telephone company will notify you in advance that

temporary discontinuance of service may be required. But if advance notice isn’t practical, the telephone

company will notify the customer as soon as possible. Also, you will be advised of your right to file a

complaint with the FCC if you believe it is necessary.

5. The telephone company may make changes in its facilities, equipment, operations, or procedures that could

affect the operation of the equipment. If this happens, the telephone company will provide advance notice in

order for you to make necessary modifications in order to maintain uninterrupted service.

6. If trouble is experienced with this equipment (the model of which is indicated below) please contact Multi-Tech

Systems, Inc. at the address shown below for details of how to have repairs made. If the equipment is causing

harm to the telephone network, the telephone company may request you remove the equipment from the

network until the problem is resolved.

7. No repairs are to be made by you. Repairs are to be made only by Multi-Tech Systems or its licensees.

Unauthorized repairs void registration and warranty.

8. This equipment cannot be used on public coin service provided by the telephone company. Connection to

Party Line Service is subject to state tariffs. (Contact the state public utility commission, public service

commission or corporation commission for information.)

9. If so required, this equipment is hearing-aid compatible.

Manufacturer: Multi-Tech Systems, Inc.

Model Number: MTA128NT

FCC Registration #: AU7USA-24353-DD-N

Ringer Equivalence: Modular Jack (USOC) RJ45/RJ1 1

Service Center in USA: Multi-Tech Systems Inc.

2205 Woodale Drive Mounds

View, MN 55112 Voice (612) 785-

3500/ FAX (612) 785-9874

Appendices

Canadian Limitations Notice

Notice: The ringer equivalence number (REN) assigned to each terminal device provides an indication of

the

maximum number of terminals allowed to be connected to a telephone interface. The termination of a

interface may consist of any combination of devices subject only to the requirement that the sum of the

ringer equivalence numbers of all the devices does not exceed 5.

Notice: The Industry Canada label identifies certificated equipment. This certification means that the

equipment meets certain telecommunications network protective, operational and safety requirements. The

Industry Canada does not guarantee the equipment will operate to the 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. The customer should be aware that 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. Users

should ensure for their own protection 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 electric inspection authority, or electrician, as appropriate.

The CE mark is affixed to this product to confirm compliance with the following European Community

Directives:

Council Directive 89/336/EEC of 3 May 1989 on the approximation of the laws of Member States relating to

electromagnetic compatibility;

and

Council Directive 73/23/EEC of 19 February 1973 on the harmonization of the laws of Member States

relating to electrical equipment designed for use within certain voltage limits;

and

Council Directive 98/1 3/EC of 12 March 1998 on the approximation of the laws of the Member States

concerning telecommunications terminal and satellite earth station equipment.

Appendices

AppendixD: Configuration Methods

Firmware-based Configuration Utility

1. If you are using another operating system, turn on your computer and start your data

communications program.

2. The TR (Terminal Ready) LED lights to indicate that your computer is ready to communicate with the

TA.

Type AT in the communications program’s terminal window and press ENTER. The TA should respond with

OK.

If it doesn’t, go to Chapter 5 for troubleshooting help.

3. To view your current configuration, type AT!L in the terminal window. Switch Type and Data Protocol

information appear. The fields for SPIDs (Service Provider Identification) and for Voice and Data

Directory Numbers will be empty. Your TA ships with Auto-TEI (terminal endpoint identifier) as its default.

Refer to before you start in Chapter 3 for your network, call control configuration, and comport settings.

4. To change one or more settings, type AT@CONFIG, press ENTER, and follow the ConfigMenu

directions.

5. Type AT&W and press ENTER to store your settings.

The following is a description of the menus.

Network Configuration Menu. Select this menu to configure network parameters such as the switch type,

data and voice TEIs, and datea nd voice MSNs. When you finish, select Save Hetwork Configuration to save

your work.

Call Control Configuration Menu. Select this menu to change how the MTA128ST/NT originates and

answers calls. Options include Auto Answer, Rings to Answer, Dialing Method, and Persistent DTR Dialing.

Data Protocols Menu. Select this menu to change the rate adaption protocol used by the MTA 128ST/NT.

Stored Numbers Menu. Select this menu to store up to ten phone numbers with a maximum of 25 characters

each. Stored number 0 is the phone number that is dialed if you enable persistent DTR dialing.

Port Control Configuration Menu. Select this menu to configure the MTA128ST/NT’s serial port, including

how the MTA 128S T/NT responds to control signals on the RS232 interface.

POTS Port Configuration Menu. Select this menu to configure the MTA128S T/NT’s POTS port which

includes the ring type, frequency, and pattern.

Help Menu. Select this menu for help on navigating through the MTA128ST/NTmenu system.

Configuration via AT Commands

You can configure the MTA128ST/NT by using AT commands, just as you would configure an analog modem.

Use this method if you prefer to work with AT commands or if you have a special requirement not

addressed by either of the configuration utilities.

Using AT Commands to Configure the MTA128ST/NT

1. Connect a VT1 00/ANSI-compatible terminal, or a computer that has a communications program that has

VT100/ANSI terminal emulation, to the MTA128ST/NT’s serial port.

2. Turn on the MTA128ST/NT. The MTA128ST/NT automatically detects whether an ASCII or ANSI

terminal is in use and adjusts accordingly.

3. Start a data communication program and select the COM port where the MTA1 28ST/NT is connected.

4. Referring to your Before Your Start notes, enter the desired AT commands in the terminal window of the

data communications program.

5. When you finish making changes, use the &Wcommand to save your new configuration, and to select it to

automatically load when the MTA128ST/NT is turned on.

6. Quit the data communications program.

For more information on AT commands, see the MTA128ST and MTA128NT AT Commands documents

Glossary

MTA128ST/NT 53

Glossary

Symbol

2B1Q (2 bits, 1 quarternary)—A line code at layer

one for the BRI U interface. Two bits of data (2B) are

mapped into one of four line values (1Q, or

1quarternary). This coding scheme

allows a single copper pair to carry 160 Kbps of

information bidirectionally and simultaneously at a

distance of up to three miles.

ACK (acknowledgement code)—A communications

code sent from a receiving modem to a transmitting

modem to indicate that it is ready to accept data. It is

also used to acknowledge the error-free receipt of

transmitted data. Contrast with NAK.

address—A numbered location inside a computer.

The computer uses addresses to access resources

such as video cards, serial ports, memory, etc.

analog signal—A waveform that has amplitude,

frequency, and phase, which takes on a range of

values between its maximum and minimum points.

analog transmission—A type of telecommunications

that uses an analog signal as a carrier of voice, data,

video, etc. An analog signal becomes a carrier when it

is modulated by altering its phase, amplitude, and/or

frequency to correspond with the source signal. Com-

pare with digital transmission.

API (application program interface)—A software

module created to allow dissimilar, or incompatible

applications programs to transfer information over a

communications link. APIs may be simple or complex;

they are commonly required to link computer

applications with mainframe programs.

ASCII (American Standard Code for Information

Interchange)— Pronounced ass-key. A binary code for

data that is used in communications and in many

computers and terminals. The code is used to

represent numbers, letters, punctuation, and control

characters. The basic ASCII code is a 7-bit character

set, which defines 128 possible characters. The

extended 8-bit ASCII code defines 255 characters.

ASI (application services interface)—A software

module that creates the interface between a LAN-

connected PC and the network operating system. ASIs

packetize computer data for transport over the

network. NASI, NCSI, MCSI and NETCI are specific

examples.

AT commands—A standard set of commands used

to control modems. Each AT command string begins

with the characters AT, which get the attention of the

modem before the actual command is issued. See

also command mode.

background—An activity that takes place in the

computer while you are running another application.

In other words, the active user interface does not

correspond to the background task.

bandwidth—The transmission capacity of a computer

channel, communications line or bus. It is expressed in

cycles per second (hertz), the bandwidth being the difference

between the lowest and highest frequencies transmitted. The

range of usable frequencies that a transmission medium will

pass without unacceptable attenuation or distortion.

Bandwidth is a factor in determining the amount of

information and the speed at which a medium can transmit

data or other information.

Bandwidth-on-Demand—Ability to request the amount of

data

speed you need in any situation. Allows you to

automatically add and drop b-channels according to your

preference; you pay only for the bandwith you need.

basic access—A term that describes a simple standardized

combination of access channels that constitute the access

arrangements for most ISDN users.

B-channel (bearer channel)—A 64 Kbps ISDN channel

used for digital high-speed data or voice transmission.

Simultaneous voice and data transmission requires

subscription to two B-channels. A voice call can be placed

or received while a data call is in process (or vice versa);

however, two simultaneous voice or two simultaneous

data calls are not supported.

bearer capability (BC)—The level of functionality provided by

the ISDN B-channel (e.g., data, 3.1 KHz audio, etc.).

bearer services—A set of ISDN functions provided by the

B-channel, such as digital telephony, toll-free

inbound/outbound calls, 64 Kbps circuit switched data, X.25

packet switched data, and frame relay data.

bit—A bit (binary digit) is a basic unit of information used in

computing and other digital electronics. It can take a value

of either 1 or 0, represented in a computer by a high or low

electrical charge.

BONDING (Bandwidth on Demand Interoperability Group)—

An inverse multiplexing method that combines multiple ISDN

channels into a single channel for enhanced throughput.

Trademark of the BONDING Consortium.

BONDING mode 1—An industry-standard ISDN B channel

aggregation protocol that was developed by the Bandwidth On

Demand Interoperability Group. This mode supports user data

rates that are multiples of the bearer rate. It provides the full

available bandwidth, but no in-band monitoring. Mode 1 is

common to all implementations of BONDING; Modes 0, 2,

and 3 are optional.

BONDING Consortium—A group that develops specifications

for common control and synchronization for management of

high-speed data over the public network.

BONDING Specification 1.0— The Version 1.0 BONDING

specification (August 1992) defines four modes of inverse

multiplexing interoperability. It allows devices from various

manufacturers to subdivide a wideband signal into 64

Kbps or 56 Kbps channels, and then pass the individual

channels over a switched digital network, recombining them

into a single high-speed signal at the receiving device.

BONDING Specification 1.1—The Version 1.1 BONDING

specification (September 1993) incorporates changes to the

1.0 specification resulting from interworking tests among

various vendors, and comments from the TIA standardization

process. No changes were made to the BONDING

algorithm or procedures.

bps (bits per second)—The unit of speed at which data bits

can be transmitted or received. Bps differs from baud when

Glossary

MTA128ST/NT 54

more than one bit is represented by a single cycle of

the carrier.

BRI (basic rate interface)—Also called 2B+D. One of

two forms of ISDN service. BRI provides two 64 Kbps

B-channels for video, voice or data, and one 16 Kbps

D-channel for control information. The total BRI data

rate is 192 Kbps, with 144 Kbps available to the user.

Multi Tech Equipment Mta128St Users Manual

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