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syncro 1496
Reference Manual
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Case Communications syncro 1496, syncro 1496r Reference Manual

Syncro 1496/1496R (V.32bis)
Reference Manual
©Case Communications Ltd 2000
X450-310851 Issue 2 0-1 Rev.5
STATUTORY NOTICES
LITHIUM BATTERY
The lithium used in the battery of this unit will react violently with water and most gases. Discharged batteries must not be crushed, incinerated or disposed of in the normal waste. Used batteries should be collected and disposed of in an approved land fill. The manufacturer and your local waste authority will provide more detailed information about their disposal.
Accidental charging and short circuiting of the battery may cause overheating and possible rupture.
Replace only with the same or equivalent type recommended by the modem supplier.
Case Communications Ltd declare that this product conforms with the protection
requirements of Council Directive 89/336/EEC on the approximation of the laws of the member states relating to electromagnetic protection.
Case Communications declare that this product conforms with the
requirements of the European Communities Council directive of 73/23/EEC on the
harmonisation of the laws of Member States to electrical equipment designed for use within certain voltage limits
.
This equipment has been tested using shielded DTE cables supplied by Case Communications Ltd. These cables, or equivalents, must be used to ensure compliance with this declaration.
Case Communications Limited has made all reasonable efforts to ensure the accuracy of the content of this document but the information contained herein does not constitute a warranty of performance of the equipment and/or software described and no
specifications given form part of any contract. This document does not constitute a licence to use or copy any software described herein and any such software must only be used in accordance with the terms of the licence supplied therewith.
Case Communications Limited reserves the right to make alterations to the equipment and software described without notice and assumes no liability for any loss or damage caused as a result of use of this document whether because of out of date or inaccurate
information or otherwise. Product and manufacturers' names referred to in this document are used for identification purposes only and Case Communications
Limited acknowledges the intellectual property rights of their respective owners in the
same.
This document is the copyright of Case Communications Ltd and may not be reproduced, copied or stored in any computerised retrieval system by any means whatsoever without the express written permission of Case Communications Lim
ited.
Published by Case Communications Technical Publications Department
X450-310851 Issue 20-2Rev.3
Preface
The Syncro 1496 is approved for use in the following countries:
Belgium Luxembourg Denmark Norway Finland Portugal France Spain Germany Sweden Holland Switzerland Ireland United Kingdom Italy
It is essential that users make themselves familiar with the Appendix entitled Country-Specific Information, as the appropriate modem for each country has its own unique setup and connection requirements.
The Syncro 1496 is available in two versions: Syncro 1496 Standalone modem. Syncro 1496R Rackmount modem for use in the Network 16 Rack
System.
This manual provides full information for installing, configuring and using the Syncro 1496 and 1496R (V.32bis) modems.
PART 1 of the manual has been laid out in a sequence that will allow you rapidly to become familiar with the essential features of the modem and to get it operational for straightforward use on the PSTN.
PART 2 takes you step-by-step through the many features of the modem that allow it to carry out complex tasks in a variety of environments.
Throughout this manual the Syncro 1496 and 1496R are described as 'the modem' where features are common to both. Where necessary they are differentiated by 'standalone' or 'rackmount' respectively.
The Network 16 Rack System which houses the rackmount version is referred to as 'the rack system', and the Network 16 Controller Card is referred to as 'the controller card'. Both these items are described in separate manuals.
X450-310851 Issue 2 0-3 Rev.1
Terms and Conventions
This manual uses the following terms and conventions: DTE 'Data Terminal Equipment', e.g. the computer
or terminal attached to the modem.
DCE 'Data Communications Equipment', e.g. the
modem.
<CR> represents a carriage return. <LF> represents a line feed. <Ctrl> represents a control character (hold down the
CONTROL key whilst pressing the required
character).
Commands entered at the keyboard are shown in 'Modern Bold' font, for example, ATDP123.
Responses from the modem that are displayed on the screen are shown in 'Modern' font, for example, ERROR.
For an explanation of terms used in this manual, see the Pocket Books of Telecommunications and Computer Communications.
X450-310851 Issue 2 0-4 Rev.1
Contents
1 Introducing the Modem 1-1
1.1 The Syncro 1496 Modem 1-3
1.2 Physical Description of the Standalone Modem 1-5
1.2.1 The Indicators 1-5
1.2.2 The Controls 1-6
1.2.3 The Connections 1-7
1.3 Physical Description of the Rackmount Modem 1-9
1.3.1 The Indicators 1-9
1.3.2 The Controls 1-9
1.3.3 The Connectors 1-9
2 Installation 2-1
2.1 Pre-Installation 2-1
2.2 Equipment Requirements 2-2
2.2.1 Data DTE 2-2
2.2.2 Controlling the Modem 2-2
2.3 Installing the Standalone Modem 2-3
2.3.1 Power Supply Connection 2-3
2.3.2 DTE Port Connection 2-3
2.3.3 Command Port Connection 2-3
2.3.4 Telephone Line Connection 2-4
2.4 Installing the Rackmount Modem 2-5
2.4.1 Power Supply Connection 2-5
2.4.2 DTE Port Connection 2-5
2.4.3 Command Port Connection 2-5
2.4.4 Telephone Line Connection 2-5
2.5 Confidence Check 2-6
2.5.1 Standalone Modem 2-6
2.5.2 Rackmount Modem 2-6
3 Getting Started 3-1
3.1 Starting Up 3-1
3.2 Commanding the Modem 3-2
3.2.1 The AT Command Set 3-2
X450-310851 Issue 2 0-5 Rev.1
3.2.2 The V.25bis Command Set 3-2
3.3 The AT Command Format 3-3
3.3.1 Basic Format 3-3
3.3.2 Example Commands 3-3
3.3.3 Combining Commands 3-3
3.3.4 Repeating Commands 3-4
3.3.5 Editing a Command Line 3-4
3.3.6 Command Option Numbers 3-4
3.3.7 The OK Response 3-4
3.3.8 Response Codes 3-4
3.4 Making a Call 3-5
3.4.1 Dialling 3-5
3.4.2 Call Progress 3-5
3.4.3 Connection 3-6
3.4.4 Disconnection 3-6
3.5 Receiving Calls 3-7
4 Modem Configurations 4-1
4.1 Factory Configurations 4-1
4.1.1 Introduction 4-3
4.1.2 Factory Configuration List 4-4
4.1.3 Factory Configuration Specifications 4-6
4.2 User Configurations 4-21
4.2.1 Default User Configurations 4-22
4.2.2 Customised User Configurations 4-26
4.3 Loading a Configuration from the Front Panel 4-27
4.4 Manipulating Modem Configurations 4-28
4.5 Resetting the Modem 4-30
5 Advanced Configuration 5-1
5.1 Display and Modem Mode Commands 5-1
5.2 DTE Interface Commands 5-2
5.3 Modulation Format 5-3
5.4 Line Commands 5-4
5.5 Remote Configuration 5-5
5.6 Security Control 5-6
5.7 Remote Log-On Commands 5-7
5.8 V.25bis Mode 5-9
6 Operational Facilities 6-1
6.1 The Modem's Telephone Directory 6-1
X450-310851 Issue 2 0-6 Rev.1
6.1.1 Storage 6-1
6.1.2 Retrieval 6-2
6.2 Dialling a Telephone Number 6-3
6.2.1 Autodialling via the Front Panel 6-3
6.2.2 Manual Dialling by Attached Telephone 6-4
6.2.3 Autodialling by DTR 6-4
6.2.4 Dialling by Command 6-4
6.2.5 Connection Sequence 6-5
6.2.6 The Blacklist 6-5
6.3 Answering Calls 6-6
6.3.1 Auto-answer 6-6
6.3.2 Answering by Command 6-6
6.4 Dial Backup 6-7
6.4.1 Single Call Dial Backup 6-8
6.4.2 Automatic Dial Backup with Autorestoral 6-9
6.4.3 Manual Dial Backup via the Front Panel 6-9
6.4.4 Manual Dial Backup via Software Command 6-9
6.5 Rate Adaption (Fallback/Fallforward) 6-10
6.5.1 Manual Fallback 6-10
6.5.2 Auto Fallback 6-10
7 Diagnostic Facilities 7-1
7.1 Introduction 7-1
7.2 Test Details 7-2
7.2.1 Local Analogue Loopback 7-2
7.2.2 Remote Digital Loopback 7-3
7.3 Testing via the Front Panel 7-4
7.3.1 Local Analogue Loopback 7-4
7.3.2 Remote Digital Loopback 7-5
7.4 Testing by Command 7-6
7.4.1 Local Analogue Loopback 7-6
7.4.2 Remote Digital Loopback 7-7
7.5 Analogue Parameters 7-8
7.6 Additional Modem Status Codes 7-11
8 The AT Commands 8-1
8.1 Introduction 8-1
8.2 The Commands 8-2
9 S-Registers 9-1
9.1 Introduction 9-1
X450-310851 Issue 2 0-7 Rev.1
9.2 Manipulating S-Registers 9-2
9.3 Non-Bit-Mapped S-Registers 9-3
10 V.25bis Commands 10-1
10.1 Command Structure 10-1
10.2 Commands 10-2
10.3 Responses 10-4
Appendices
A Modem Specification A-1 B Interfaces and Cables B-1
B.1 DTE Port B-2
B.1.1 Interface B-2 B.1.2 Cables B-2
B.2 Command Port B-3
B.2.1 Standalone Modem B-3 B.2.2 Rackmount Modem B-4
C Country-Specific Information C-1
C.1 Statutory Instructions for UK C-2
C.1.2 Installing the Standalone Modem C-5 C.1.3 UK Telephone Number Blacklist C-6
C.1.4 Restrictions on Use of S-Registers C-7 C.2 Statutory Instructions for Belgium C-8 C.3 Statutory Instructions for Denmark C-10 C.4 Statutory Instructions for Finland C-12 C.5 Statutory Instructions for France C-14 C.6 Statutory Instructions for Holland C-16 C.7 Statutory Instructions for Ireland C-18 C.8 Statutory Instructions for Italy C-20 C.9 Statutory Instructions for Luxembourg C-22 C.10 Statutory Instructions for Norway C-24 C.11 Statutory Instructions for Portugal C-26 C.12 Statutory Instructions for Spain C-28 C.13 Statutory Instructions for Sweden C-32
X450-310851 Issue 2 0-8 Rev.1
D Technical Guide D-1
D.1 Introduction D-1 D.2 Standalone Modem D-2
D.2.1 Accessing the Modem Card D-2 D.2.2 Terminal Block Wiring D-3 D.2.3 Transmit Level Settings D-3 D.2.4 Link Options D-4 D.2.5 Connecting the 24/48 VDC Version D-5
D.3 Rackmount Modem D-6
D.3.1 The Modem Card D-6 D.3.2 Transmit Level Settings D-6 D.3.3 Link Options D-7 D.3.4 Line Connection D-8
Figures
1-1 The Standalone Modem Front Panel 1-5 1-2 The Standalone Modem Rear Panel 1-7 1-3 The Rackmount Modem Front Panel 1-9
2-1 Standalone Modem Connections 2-4 4-1 Modem Software Configurations 4-28 D-1 Standalone Card Layout D-2
D-2 Terminal Block Connections D-3 D-3 Standalone Modem Link Locations D-4 D-4 Rackmount Card Layout D-6
Tables
4-1 Loading a Configuration 4-27 4-2 Configuration Recall and Save Commands 4-29
X450-310851 Issue 2 0-9 Rev.1
X450-310851 Issue 2 0-10 Rev.1
PART 1
BASIC OPERATION
Chapter 1 Introduction Chapter 2 Installation Chapter 3 Getting Started
X450-310851 Issue 2 1-1 Rev.0
X450-310851 Issue 2 1-2 Rev.0
1 Introduction
1.1 The Syncro 1496 Modem
The Syncro 1496 is a multi-standard autodial modem capable of passing synchronous data at up to 14400 bps over leased (private wire) lines, and PSTN (dial-up) lines.
The modem complies with the following ITU-T Recommendations:
V.33 14400 or 12000 bps synchronous operation.
V.32 9600 or 4800 bps synchronous operation.
V.32bis 14400, 12000 or 7200 bps synchronous operation.
V.29 9600, 7200 or 4800 bps synchronous operation.
V.22 1200 bps synchronous operation.
V.22bis 2400 bps synchronous operation.
The other principal features of the modem are:
• Synchronous full- or half-duplex operation over 2-wire leased line or PSTN.
• Synchronous full-duplex operation over 4-wire leased line.
• Trellis coded modulation for enhanced performance.
• Near and remote end echo cancellation in V.32 and V.32bis modes.
• Automatic dialling using AT or V.25bis commands.
• An electronic storage system for telephone numbers. Numbers are stored, and subsequently retrieved, by using the numbered buttons on the front panel, or by AT commands.
• Automatic answering to V.25 of incoming calls. Disconnection of calls is always completed 'cleanly' so that the modem is ready for the next call.
• Storage of up to 16 pre-set configurations.
• Comprehensive modem configuration using AT commands, which can be from a Syncro 1496 or Syncro 1496R modem at a remote site, with security controls to prevent unauthorised use of this facility.
X450-310851 Issue 2 1-3 Rev.1
• A port conforming to ITU-T V.24/V.28 (EIA RS-232-C) standards for connecting the DTE.
• A separate command port for connection to a terminal or PC, so that commands may be entered or calls monitored while the modem is in use.
• Comprehensive test functions to V.54, initiated by AT command or by front panel switches.
• Modem Management. The modem may be controlled by the Network 16 Controller Card or Network 6, and managed as part of a network using a high-level network management system.
X450-310851 Issue 2 1-4 Rev.1
1.2 Physical Description of the Standalone Modem
Figure 1-1 The Standalone Modem Front Panel
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SYNCRO 1496
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V.32bis
1.2.1 The Indicators
The indicators are on the front panel of the modem, which is shown in Figure 1-1.
RUN A continuous light means that power is on and the modem is
functioning correctly. A flashing red light indicates that a test is being performed.
TXD Transmit Data. A flashing light indicates that data is being
transferred from the local DTE.
RXD Receive Data. A flashing light indicates that the modem is
sending data to the local DTE.
RTS Request To Send. A continuous light indicates that the local
DTE is ready to send data. In full-duplex mode this is normally lit at all times, but in half-duplex mode, only when data is ready to be transmitted.
CTS Clear To Send. A continuous light indicates that the modem
is ready to transmit data to a remote modem. In full-duplex mode this is normally lit at all times, but in half-duplex mode, lights shortly after the
RTS indicator.
DCD Data Carrier Detect. Lit to indicate recognition of a carrier
signal from the remote modem. In full-duplex mode this is normally lit at all times, but in half-duplex mode, only when the remote modem has control for transmitting.
DSR Data Set Ready. Lit to indicate that the modem has control
of the line and is in data transmit mode. During a self-test with signal injection, indicates errors.
X450-310851 Issue 2 1-5 Rev.0
DTR Data Terminal Ready. Lit to indicate that the local DTE is
ready to begin communications.
OH Off Hook. Lit when the modem has connected to the
telephone line.
1.2.2 The Controls
The controls are on the front of the modem, which is shown in Figure 1-1. The names above the line are for on-line operation of the modem. The names below the line are for configuration loading, or dialling on the PSTN. The left-hand button is a non-latching switch. The other five have a latching action.
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DATA Use as DATA to go into data mode when manually ENTER connecting a call, and press again to revert to
command mode. Use as
ENTER to load a configuration or dial a telephone
number.
DB Use as DB to initiate a dial backup call using a stored 4 telephone number.
Use as
4 in conjunction with the DIAL, 2 and 1 buttons to
select a configuration or telephone number.
TEST Use as TEST to activate a test sequence for local 2 or remote tests with your modem.
Use as
2 in conjunction with the DIAL, 4 and 1 buttons to
select a configuration or telephone number.
AL Use as AL to select an analogue loopback. 1 Use as 1 in conjunction with the DIAL, 4 and 2 buttons to
select a configuration or telephone number.
RDL Use as RDL to select a remote digital loopback. LOAD Use as LOAD to select a load configuration option.
FB Use as FB to revert to the selected fallback speed. DIAL Use as DIAL to select a stored telephone number to dial.
It is also used in conjunction with the
4, 2 and 1 buttons to
load a factory or user configuration.
More-detailed descriptions of the uses of the buttons are given in the descriptions of the functions for which they are needed.
X450-310851 Issue 2 1-6 Rev.0
1.2.3 The Connections
The connections are made from the rear panel of the modem. The 230 volt version is shown in Figure 1-2.
Pin assignments and suggested cable configurations are detailed in Appendix B.
Figure 1-2 The Standalone Modem Rear Panel
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COMMAND
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DTE INTERFACE
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250V 500mA(T)
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LINE 3
DTE INTERFACE Female 25-way D-type connector (ISO 2110) to
connect the modem to your local DTE.
COMMAND PORT 3.5 mm stereo jack socket to accept the command port
adapter.
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EARTH For connecting the modem to external earth. If this
is not used, then the modem must be earthed through the mains cable, which must be plugged in before the line cord is connected.
POWER 2-metre mains cable fitted with a moulded plug for
connection to a standard power outlet. To isolate the modem from the power source, first remove the line cord, then remove the mains plug from the power outlet.
FUSE 500 mA (T) anti-surge 250 V mains fuse (230 volt
version). You must first disconnect the modem from the line and then from the power supply before replacing this fuse. Always replace the fuse with one of the same rating.
SWITCH Modem power ON (1) or OFF (0).
X450-310851 Issue 2 1-7 Rev.1
LINE 1 3-metre cable fitted with a plug for connection to your
leased line.
LINE 2 Not used. LINE 3 3-metre 4-way line cord fitted with a plug to connect to
the dial-up network.
X450-310851 Issue 2 1-8 Rev.0
1.3 Physical Description of the Rackmount Modem
Figure 1-3 The Rackmount Modem Front Panel
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V.32bis
1.3.1 The Indicators
The indicators have the same meanings as for the standalone modem (Section 1.2.1).
1.3.2 The Controls
The control buttons have the same function as the equivalent buttons in the standalone modem (Section 1.2.2). The names on the left of the buttons are for configuration loading or telephone dialling. The names on the right of the buttons are for on-line operation of the modem.
1.3.3 The Connectors
The plug-in modem card connects with sockets on the rack system. The interfaces on the rack are described in the rack manual.
X450-310851 Issue 2 1-9 Rev.0
X450-310851 Issue 2 1-10 Rev.0
2 Installation
Please refer to Appendix C for country-specific information.
2.1 Pre-Installation
In addition to your DTE, and depending on the way you set up and intend to use your modem, you may need:
• A 25-pin male D-type (ISO 2110) cable to connect the modem to the DTE (your computer or terminal). See Appendix B for details of the pin connections.
• A telephone line (PSTN or leased), terminated with a standard socket.
• For asynchronous command of your modem you will need a separate asynchronous command terminal with a V.24/RS-232-C serial port.
• For the standalone modem, a mains power socket outlet installed near the modem, easily accessible, and capable of supplying 1.0 amps at the nominal voltage and frequency.
The modem is designed for use in a domestic, office or computer room environment. The standalone modem should be sited:
• Sufficiently close to the mains power outlet so as not to cause strain on the connecting cable.
• Sufficiently close to the PSTN or leased line termination so as not to cause strain on the connecting cord.
• Away from sources of heat such as radiators or direct sunlight.
• Away from sources of radiation such as motors and video displays.
X450-310851 Issue 2 2-1 Rev.0
2.2 Equipment Requirements
2.2.1 Data DTE
Your data DTE must operate synchronously. Note the following points:
• If you are using a PC, the standard serial port provided in most models operates asynchronously; to use a PC for synchronous data, you need a Synchronous Communications Adapter (consult your PC supplier).
• Simple terminals (VDUs) are usually asynchronous, although special models designed to work synchronously are available.
• Most wide area and local area networking equipment will operate synchronously.
2.2.2 Controlling the Modem
To control your modem, you will need to send AT commands to it. (V.25bis commands are a special case, discussed in Chapter 10.)
For sending AT commands, you require a separate asynchronous command terminal with the following character format:
1 start bit, 7 data bits, even parity, 1 stop bit.
The data rate must be 9600 bps for a standalone modem or rackmount controller card, or 1200 bps for a rackmount modem via a Y cable.
This terminal will be connected to the standalone modem's command port. The command port for the rackmount modem is normally routed to the
rack Controller Card. Appendix B contains details of how to route the command port via the DTE connector.
X450-310851 Issue 2 2-2 Rev.0
2.3 Installing the Standalone Modem
2.3.1 Power Supply Connection WARNING: Do not connect the modem to the
mains socket or to the telephone line at this stage.
The standard modem is supplied for use on 230 VAC mains supplies. The voltage for which it is set is shown on the rear panel. Check that the voltage shown is correct for your mains supply before proceeding further.
The mains cable from the modem is provided with a moulded plug for connection to a standard mains socket outlet. If this plug is not suitable for your socket, refer to the Appendix entitled 'Country-Specific Information' for details of how to change it. Do not use an adapter.
A special version of the modem is available for use on 24 to 48 VDC supplies. Details are given in the Appendix entitled 'Technical Guide'.
When you are sure the modem is correctly rated for your mains supply, ensure that the modem is switched off (
0 position) then plug the mains lead
into the mains supply. Do not switch on until all other connections have been made.
2.3.2 DTE Port Connection
The synchronous data DTE must be connected via a cable to the modem's DTE interface connector. A straight-through 25-way cable will be suitable for many synchronous terminals, but there are some which require a cross­over cable. If in doubt, consult the DTE's manual for connection details and compare with information in Appendix B of this manual. See Figure 2-
1.
2.3.3 Command Port Connection
The command port allows you to connect a separate asynchronous command terminal for entering commands, as shown in Figure 2-1.
The port is provided on a stereo jack socket. An adapter cable to convert this to a standard 25-way D-type socket (ISO 2110) is provided (see Appendix B for details).
The data format and speed for the command port is fixed at 7 data bits, even parity, 9600 bps.
X450-310851 Issue 2 2-3 Rev.1
Figure 2-1 Standalone Modem Connections
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LEASED
LINE
2.3.4 Telephone Line Connection
Your modem is supplied ready for connection to either a PSTN or Leased Line circuit. The telephone cable marked
LINE 1 is terminated with a
standard plug (see Appendix B), for connection to a Leased Line outlet. The socket marked
LINE 3 is used when connection is to be to a 2-wire PSTN
circuit. Unless the separate earth connection has been used, the mains plug must
first be inserted in a power outlet (to earth the modem), before connecting the modem to the PSTN line.
Whichever of the two circuit types you will be using, connect the modem to the telephone line.
All connections to the telephone network must be via a standard plug and socket, and must not be hard wired.
X450-310851 Issue 2 2-4 Rev.0
2.4 Installing the Rackmount Modem
The modem should only be used in a rack system for which it has been designed and approved. Full installation details are given in the manual for the rack system.
2.4.1 Power Supply Connection
The rackmount modem draws its power from the rack power supply. There is no power switch on the modem.
2.4.2 DTE Port Connection
The connections for the modem's DTE port are via the 96-way connectors between the modem circuit board and the rack system. Connections to the DTE are made from the back of the rack. See Appendix B.
2.4.3 Command Port Connection
The connections for the modem's command port are via the 96-way connectors between the modem circuit board and the rack system. See Appendix B.
The format and speed for the command port is fixed at 7 data bits, even parity, 1200 bps.
2.4.4 Telephone Line Connection
The modem's connections for the telephone line are via the 96-way connectors between the modem circuit board and the rack system. Connections to the telephone line are made from the back of the rack. See the rack system manual for details.
X450-310851 Issue 2 2-5 Rev.0
2.5 Confidence Check
When the modem installation is complete, a brief confidence check may be carried out to check that the modem is functioning.
2.5.1 Standalone Modem
1. Ensure that the modem power switch is off.
2. Check that all the front panel buttons are out.
3. Push in and hold in the
DATA button.
4. Switch on the modem power switch (while holding in the
DATA button).
5. Keep the
DATA button held in for 3 seconds then release it. The modem
is now in its factory default condition. It will send a RESTART message to the command terminal.
6. Press in the
TEST button and then the AL button. The modem will
perform an analogue loop test and the
RUN LED will begin to flash.
7. Check the
DSR LED. It should stay off permanently. If it flashes on, an
error has been detected. In this case recheck the installation: if no mistakes are found refer to your supplier.
8. Press the
AL and TEST buttons to release them.
2.5.2 Rackmount Modem
1. Fit the modem in the card guides of the rack, but not pushed fully home.
2. Check that all the front panel buttons are out.
3. Push in and hold in the
DA button.
4. Push the modem firmly into the rack (while holding in the
DA button).
5. Keep the
DA button held in for 3 seconds then release it. The modem is
now in its factory default condition. It will send a RESTART message to the command terminal.
6. Press in the
TE button and then the AL button. The modem will perform
an analogue loop test and the
RUN LED will begin to flash.
7. Check the
DSR LED. It should stay off permanently. If it flashes on, an
error has been detected. In this case recheck the installation: if no mistakes are found refer to your supplier.
X450-310851 Issue 2 2-6 Rev.0
8. Press the AL and TE buttons to release them.
9. Secure the modem in the rack.
X450-310851 Issue 2 2-7 Rev.0
X450-310851 Issue 2 2-8 Rev.0
3 Getting Started
This chapter covers basic details of how to set up your modem in a straight­forward environment: how to control the modem from your DTE, and how to use the AT command language to make a call whilst the modem is in its default condition.
3.1 Starting Up
Before using the modem, ensure that it has been installed correctly as described in Chapter 2.
The factory default is configuration 0 (described in Section 4.1). As this is suitable for many uses on leased lines, you may not need to reconfigure the modem. If this is so, follow the procedure below, checking that the modem and command terminal (which may be the data DTE) respond as indicated.
1. Switch on the DTE and the command terminal.
2. Switch on the modem. The LED indicators on the front panel will reflect
the status of the DTE interface.
TXD, RXD and OH should be off.
3. Load the default factory configuration 0, as follows. Make sure all the
buttons on the modem's front panel are OUT. Press the
LOAD (L) button,
press and release the
ENTER (
|
) button, then release the LOAD (L) button.
4. Type the command AT on the command terminal keyboard and press
RETURN. The message OK should be displayed on the screen.
If factory configuration 0 is not suitable for your operation, go to Chapter 4 to choose a more suitable configuration, and repeat the procedure above, using the buttons shown in Table 4-1 during step 3.
For example, to load configuration 10, ensure that buttons
2 and DIAL (D)
are in, and that all other buttons are out, before pressing
LOAD (L). After
pressing
ENTER (
|
), release LOAD (L), 2 and DIAL (D).
X450-310851 Issue 2 3-1 Rev.0
3.2 Commanding the Modem
3.2.1 The AT Command Set
Your modem uses the 'AT' command set. These commands are used to exercise the powerful features of your modem, such as:
• Making user configurations.
• Saving telephone numbers in the modem's directory.
• Auto-dialling telephone numbers.
• Performing modem tests. Section 3.3 provides an explanation of the AT command language with
simple working examples. We recommend you to read this even if you have used AT commands before.
The AT commands are listed alphabetically in Chapter 8.
3.2.2 The V.25bis Command Set
ITU-T has defined the V.25bis Recommendation for commands. However, it is much more limited than the AT command set, as it only covers dialling a telephone number. Your modem has been equipped with a V.25bis command set to make it compatible with hosts using software based on this language. Details are in Chapter 10.
X450-310851 Issue 2 3-2 Rev.1
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