CXR AJ 2885P, V34 User Manual

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Page 1

User's Manual V34bis Fax-modem - AJ 2885 P

User's Manual

V34 Fax-modem - AJ 2885P

P/N 8000 601 953 Indice 00

AJ 2885 P - Page 1

Sales, manufacturing and R&D Centre :

CXR SA

Rue de l'Ornette - 28410 Abondant - France Tél 33 (0) 237.62.88.00 - Fax 33 (0) 237.62.88.01

Technical support: 33 (0) 237.62.88.04

WEB Site: http://www.cxr.fr

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Notice

No part of this document may be reproduced, transmitted, copied out or translated without prior

ritten consent of CXR SA. w

The only purpose of this manual is to provide information and installation instructions

CXR reserves the rights to improve its products and specifications without notice.

CXR has made every effort to provide the best possible quality in writing this manual but cannot be held responsible for any damage, which could result from errors or improper description of the equipment, its characteristics and operation.

P lease read and enforce the safety instructions of the safety and installation chapters.

Head quarter:

CXR Rue de l’Ornette - 28410 Abondant - France Tel : +33 (0) 237 628 800 Fax : +33 (0) 237 628 801

Foreword

This document describes how to set up the CXR AJ 2885 P modem.

• Chapter 1 is to familiarize the user with the operation of a modem.

• Chapter 2 describes the installation.

• Chapter 3 describes the most common uses of a modem.

• Chapter 4 explains the operation of the modem security features and memories.

• Chapter 5 provides technical characteristics.

• Chapter 6 indicates how to solve operation problems.

Note to the reader

Users who are not familiar with the AJ 2885 P modem operation, should read the first three chapters. Advanced users can refer directly to chapter 4 to use the advanced functions of the modem. Whenever a problem arises, please refer to chapter 6.

The CXR Anderson Jacobson team

thanks you for purchasing an AJ 2885 modem. We hope this equipment will be to your satisfaction, and in order to provide you with a better service, we thank you for completing and mailing us the reply coupon enclosed with your modem. You can also find in our range of products some ISDN adapters. Please call you distributor or CXR for information.

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Important Information

Conformity Statement EC

Manufacturer name: CXR Manufacturer address: rue de l'Ornette - 28410 ABONDANT – France Product name: AJ 2885 P This equipment was design to comply with the ETSI – CTR.21 standard. It is intended to

connect to the Public Switched Telephone Network. However, since differences exist between networks from a country to another or from an operator to another, this conformity does not constitute an absolute guaranty for an optimum operation of the equipment in any situation of use. In any case of problem, you should first contact your provider of this equipment.

The CE mark attests the conformity of this equipment to the main requirements of the R&TTE 1999/05/CEE European community :

For the user’s safety, in compliance with the 73/23/EEC European Directive, as per EN.60950 standard

For electromagnetic compatibility, in compliance with the 89/336/EEC European Directive, as per EN.61000-6-1 and EN.61000-6-3 standards.

CXR states that this equipment is manufactured in compliance with the Annex II of the 1999/05/EEC European Directive.

Safety Instructions

The following accesses are referenced as SELV (Safety Low Voltage] in conformity with EN.60950 standards:

• 5 VDC Input of the AJ 2885P-xxV desktop unit

• 48 VDC Input of the AJ 2885 P - xxC desktop unit

• Terminal: V24 - RS232 data port

The following access are referenced as TNV (Telecommunication Network Voltage] in conformity with EN.60950 standards:

• Tel-Line : PSTN access as a TNV-3 interface,

• Lease : Leased line access as a TNV-2 interface.

Desktop AJ 2885 P - xxV:

The wall mount power supply adapter is the main switching element. Thus this plug must be installed close to the equipment and provided easy access.

To totally disconnect the equipment from the supply source we recommend you disconnect the power cord from the mains wall outlet. In order to comply with the safety regulations, it is imperative to use the accessories (power supply and cables) provided with the equipment. When access to the inside of the modem is necessary, it is imperative to disconnect the power adapter from the mains outlet.

Desktop AJ 2885 P – xxI :

The power cord is the main switching element. Thus the mains outlet must be installed close to the equipment and provided easy access. In order to comply with the safety regulations, it is imperative to use the accessories (power supply and cables) provided with the equipment. When access to the inside of the modem is necessary, it is imperative to disconnect the power cord from the mains outlet.

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Rack mountable card AJ 2885 P - xxR

The power switch located on the rear of the chassis is the only switching element, thus it must be fully accessible. The connection to the mains is achieved through the cable equipped with a male-grounded plug. Extract the card from the chassis when maintenance or servicing is required

For safety reasons, any operation on the equipment and particularly opening the desktop enclosure must be carried out by maintenance person qualified by CXR.

The equipment must imperatively be returned to CXR in any case of anomaly, fall, loss of performance, water exposure, power supply damage, power or line cord damage, …

Environment

The AJ 2885 P is designed for residential or light industrial use within the following environmental conditions:

• Storage Temperature 0 to 70 °C

• Operating Temperature: 0 to 45 °C

• Hygrometry: 0 to 90% without condensation

• Class: IP40

• Flammability: UL94-V0

Place the equipment in a area well suited for its good operation and its

• Equipment must not be exposed to excessive solar radiation

• Equipment must not be in contact with water. It must not be used near a water reserve or

in a wet location.

• Equipment must be installed on a plane and horizontal surface, without vibration.

• Make sure the area is clean, dry and exempt of dust

• Make sure that nothing could obstruct the air vent of the product, and that no small size

part (screw, staple, clip, …) could get into it.

• Always disconnect the mains connection before any operation (move, connecting other

equipment, …) on the equipment. The mains cord must be taken from the socket; any effort on the cord could induce damages and risk of electrical shock.

Use

The AJ 2885 modem is intended to connect to the Public Switch Telephone Network and to a leased line in voice frequency mode (300 to 3400 Hz) It was designed to comply with the ETSI CTR.21 standard.

The AJ 2885 P modem provides the modes of connection as per the following ITU-T standards:

• Data modes : V34, V32Bis, V32, V22Bis, V22, V23, V21

• Error correction and data compression : V42, V42Bis, MNP4, MNP5

• Fax mode : Group 3, Class-2, V17, V29, V27Ter, V21

The AJ2885P connects to a data terminal equipment through its terminal interface :

• V24-V28 or RS232

• V11 compatible with X21 and V35 though configuration jumpers (except FT model)

• Data rates : 300 to 115,200 BPS in asynchronous mode, and 1200 to 33,600 BPS in

synchronous mode.

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Product range

The AJ 2885 modem has various options:

• Dial-up

• Leased line

• Group III fax

• Stand alone or rack

• LCD front panel

These different versions are summed up in the following table. The names in the first column will be used throughout the manual to indicate when these options apply.

Metallic enclosure.

LCD version

Stand alone version

Rackmount version

Versions :

Options :

FT FPx SD/SM BPx BDx

2 / 4 wire leased line

   

Dial backup and real time clock

   

14.4 KBPS – Cl.2 G.3 Fax

 

V11 – X21 / V35 interface

   

V23 / Bell 202 T 1200/1200 4 wire mode

 

LCD and 3 keys front panel



remote action and alarm relays



Firmware in Flash memory

    

Metallic enclosure & internal 110/230 V Mains

- - SDM BPM BDM

Plastic enclosure & internal 110/230 V Mains

- - SDI - -

Metallic enclosure & internal 48 Vdc converter

(*)

- - SDN BPN BDN

Plastic enclosure and wall mount 110/230 mains supply

FTV FPV - - -

Plastic enclosure and internal 48Vdc converter (*)

- FPC - - -

Card for the AMS4/16 chassis

- FPR - BPR -

Options :  Tropicalization : Special treatment that allows the modem to be used in strong climatic

environment.

 Internal DC coverter (*) : the AJ2885P modem can also be provided with a CD converter

for supply voltages of 12, 24 and 36 Vdc.

AJ 2885 features

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The AJ 2885 is a modem for the professional user. It encompasses a number of features that place it above the rest. It includes features such as:

• Configuration through front panel LCD and key pad: for synchronous application, the 2885

SDV can be fully set up from its user friendly front panel.

• Busy-Out: Whenever modems are pooled, a faulty modem will lock-up the rest. The busy-

out, standard in the CXR modems lets the PBX pass onto the next modem without upsetting the system.

• Line Quality Testing: The modem can test a line at every call. If it finds it below standard, it

will hang-up and retry up to 5 times transparently to the user. This guarantees that you have the most reliable connection every time on any type of infrastructure.

• BERT: The modem can perform simple Bit Error Rate Tests between two CXR modems to

qualify the digital transmission of data.

• ITU V.13: Half duplex operation.

• 10 Configurations

• UnAttended Automatic Dial Backup: If ever your Leased Line fails, the AJ 2885 will back-up

onto the dial-up network. Not only that, it will continue to monitor the Leased Line until it is operational and switch back automatically. This is called Intelligent LookBack. Back-up may be allowed and disabled over week-day and week-end periods.

• Password Security: To change configuration of the modem, 2 levels of password security

are provided - User & Supervisor.

• Connection Security: 4 levels of security are provided:



Answerback, i.e. where the far modem asks the calling modem for a password, transparently to the user.



Pass Through Access, i.e. where the far modem asks the user for a password.



Automatic Modem Password Access, i.e. same as before but for synchronous operation.



Call back, i.e. the far modem asks for a password from the calling modem and hangs up. The far modem associates a telephone number with the password and calls back the original calling modem.

• 5 different Statuses:



Modem Configuration.



Line, e.g. Xmit/Rcve levels, signal quality etc.



Line Error Statistics, e.g. for MNP or V42, the number of bad characters, bytes frames etc.



Leased Line Statistics, e.g. connection & idle time etc.



Dial-Up Statistics, e.g. same as leased line with directory information etc.

This is but a short list. For full details, consult the Command Set Manual.

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Contents

INTRODUCTION........................................................................................................ 9

1.1.

HE MODEM

........................................................................................................ 9

1.2.

HE MODEM-FAX

.................................................................................................. 9

1.3.

ALLING MODES DIALING

...................................................................................... 9

1.3.1. Calling Mode................................................................................9

1.3.2. Answering Mode...........................................................................9

1.4.

EASED LINE

..................................................................................................... 10

1.5.

ROTOCOLS

...................................................................................................... 10

1.6.

EMORY

........................................................................................................... 10

2. INSTALLATION....................................................................................................... 12

2.1.

TAND ALONE VERSION

...................................................................................... 12

2.2.

ACKMOUNT VERSION

....................................................................................... 13

2.3.

WITCH AND JUMPER SETTINGS

......................................................................... 15

2.3.1.

Dumb mode : J6 jumper .............................................................15

2.3.2.

SW5 switch .................................................................................15

2.3.3.

V11 – V28 terminal interface : J9 – J21 jumpers.......................15

2.4.

OWER-UP SELF-TEST

....................................................................................... 16

3. OPERATION............................................................................................................ 17

3.1.

YNTAX OF

COMMANDS

................................................................................ 17

3.2.

IRST DIALOGUE

................................................................................................ 17

4. FRONT PANEL OPERATION ................................................................................. 18

4.1.

PERATING MODES

........................................................................................... 18

4.1.1.

Operating modes ........................................................................18

4.1.2.

The Front Panel .........................................................................18

4.1.3.

The Push Button .........................................................................19

4.1.4.

Configuration Select...................................................................20

4.1.5.

Factory configuration detail ......................................................20

4.2.

ONFIGURATION THROUGH FRONT PANEL

LCD

AND KEYPAD

............................... 21

4.2.1.

The four LEDs indicate the state of the modem .........................21

4.2.2.

LCD displays ..............................................................................21

4.2.3.

Three keys operation ..................................................................22

4.2.4.

Example......................................................................................23

5. CONFIGURATIONS ................................................................................................ 25

5.1.

ACTORY CONFIGURATION

................................................................................. 25

5.2.

ELECTING THE MODEM SPEED

.......................................................................... 25

5.3.

ATE AND CONNECTION MODE SELECTION

.......................................................... 27

5.4.

SYNCHRONOUS OR SYNCHRONOUS MODE

:....................................................... 29

5.5.

ONFIGURATION OF THE ASYNCHRONOUS MODE

: ............................................... 29

5.5.1.

Error correction and data compression:....................................29

5.5.2.

Flow control:..............................................................................30

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5.6.

ONFIGURATION OF THE SYNCHRONOUS MODE

................................................... 30

5.7.

UTOMATIC DIALING DIRECTORY

......................................................................... 31

5.8.

EASED LINE

...................................................................................................... 31

5.9.

V23

AND BELL

202 T M

ODES ON LEASED LINE

.................................................. 32

5.10. S

AVING USER CONFIGURATIONS

......................................................................... 33

5.11. V54 - M

AINTENANCE

.......................................................................................... 33

5.11.1. AT command operation ..............................................................33

6. SECURITY AND MEMORY ..................................................................................... 35

6.1.

RINCIPLES

....................................................................................................... 35

6.2.

HE PHONE DIRECTORY

...................................................................................... 35

6.3.

NSWERBACK SECURITY

.................................................................................... 36

6.4.

ALLBACK SECURITY

.......................................................................................... 36

6.4.1.

Automatic callback.....................................................................36

6.4.2.

Dial number request callback. ...................................................37

6.5.

NACTIVITY PASSWORD

....................................................................................... 37

7. SPECIFICATIONS ................................................................................................... 38

7.1.

INE SIDE CHARACTERISTICS

.............................................................................. 38

7.2.

UTOMATIC CALL & ANSWER

.............................................................................. 38

7.2.1.

Originating.................................................................................38

7.2.2.

Answering a Call........................................................................39

7.2.3.

Connection - Disconnection.......................................................39

7.3.

ERIAL INTERFACE

............................................................................................. 39

7.4.

FAX-

MODE

......................................................................................................... 39

7.4.1.

Automatic Call and Answer........................................................39

7.4.2.

Transmission Modes...................................................................39

7.4.3.

Operating Mode .........................................................................39

7.4.4.

Service Class 1 Command Set....................................................39

7.4.5.

Service Class 2 Command Set....................................................40

7.5.

ENERAL CHARACTERISTICS

.............................................................................. 40

8. TROUBLESHOOTING............................................................................................. 41

9. APPENDIX A - V24 SIGNALS ................................................................................. 42

9.1.

V24 – V28

INTERFACE

....................................................................................... 42

9.2.

V11-V35

INTERFACE

: ........................................................................................ 43

9.3.

IAL LINE CONNECTOR

: RJ11

CONNECTOR

......................................................... 44

9.4.

EASED LINE CONNECTOR

: RJ11

CONNECTOR

................................................... 44

9.5.

LARM RELAY CONNECTOR

................................................................................ 44

10. APPENDIX B - COUNTRY SPECIFIC INFORMATION........................................... 45

11. APPENDIX C – GENERAL CONDITIONS OF GUARANTY ................................... 46

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1. Introduction

This chapter is to familiarize the user with the operation of a modem. Note: <CR> indicates that the user must press the return key after a command sequence.

1.1. The modem

A modem is a device that allows two terminals (DTE, PC...) to communicate via a telecommunication line (phone line).

The data is converted by the modem into electrical signals adapted to the telecommunication network. This conversion is called modulation and demodulation.

Various conversion techniques have been developed to speed-up the data flow. The different speeds are particular to each type of modulation: 300 bps in V21, 2400 bps in V22bis, 14400 bps in V32bis, and 33600 bps in V34.

1.2. The modem-fax

A fax device transmits scanned images via the telephone network. In addition to traditional fax machines, the fax modem also allows transfer of computer data

such as:

• ASCII files from a text processor,

• PCX or TIF files from a graphic editor, etc.

The Fax mode operation is controlled by a fax software which:

• Converts files to T4 format (fax graphic format),

• Transmits and receives faxes,

• Supervises fax modem operation.

Supervision of the fax modem is carried out by a standard protocol: "Asynchronous Facsimile DCE Control Standard", Class 1 Service - TR 29.2188 or Class 2 Service - TR 29.2388.

The computer equipped with a fax modem will be able to transmit and receive fax in Group III mode:

• At about one A4 page per minute,

• In fine or standard resolution.

See chapter 5 for the list of modem class 1 and 2 commands.

1.3. Calling modes dialing

The modem can be in 2 modes:



Send or calling,



Receive or answer.

1.3.1. Calling Mode

The modem switches to originate mode when the dial command: ATD 37487126 is sent (example number).

The calling modem then waits for the remote modem to respond.

1.3.2. Answering Mode

The modem switches to answer mode when it detects ringing on the phone line.

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The answer is carried out automatically if the command ATS0 = 2 was sent to the modem by the local PC. A training sequence is then initiated. A training sequence is the hand-shake sequence between modems to establish a communication link. It establishes speed, modes...

1.4. Leased line

A leased line is a permanent communication link dedicated between two modems. This kind of link is used for:

• High usage,

• Secure communications,

• Privately managed networks.

The leased line, can be a:

• 4-Wire type where there is:



1 transmit pair,



1 receive pair.

• 2-Wire type where:



the same pair of wires is used for transmit & receive.

For a leased line, a modem is designated:

• Originating modem (ORIGINATE or MASTER),

• The other as the answering modem (ANSWER or SLAVE).

Modems in leased line mode always try to connect when power is on, in order to provide permanent a link.

The AJ 2885 modem can establish leased line connections in the following speeds:



V22 1200 bps



V22bis 2400 bps



V32 9600 bps/4800 bps



V32bis 14400 bps/12000 bps



V34 33600 bps down to 2400 per steps of 2400 bps

In case of failure on the leased line, the AJ 2885 modem performs automatic switch-over to the dial-up PSTN. It then monitors continuously the leased line until it can connect again on leased line. The AJ2885P modem is provided with an internal real time clock and calendar, to disable dial backup when the link is not of use and then optimise the PSTN cost .

1.5. Protocols

Two types of protocols can be used to improve communication performance between two modems:

• Error correction:



MNP4 or V42 detect errors which occurred during data transmission, and either correct them or re-transmit the data.

• Data compression:



MNP5 or V42bis compress the data and thus transmit at a higher effective speed.

These two types of protocols improve efficiency and reliability of a connection.

1.6. Memory

Beyond these basic principles, the modem offers other functions, aimed at improving performance and ease of use.

These functions are controlled via the memory (S-Registers) of the modem, and are available via the extended AT command set.

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These functions are described in chapter 4 of this manual. Some of the extra functions are:

• Storage of phone numbers,

• Forced V24 signals,

• Exchange of a password between two modems ("Answer Back"),

• Pre-qualification of the telephone line,

• Storage of user modem configuration.

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2. Installation

2.1. Stand alone version

Package Contents:

Before installing your modem, check all these items are present:

• One AJ 2885 modem

• One RJ11 phone cable

• Power supply or 48V cable for SPC version

• Leased line RJ-11 cable, except for STV and FTV versions

• A CD-ROM that includes

• The AT and V25bis command reference manual

• This User manual

• Software (as an option)

Connections: Connect your modem as shown on the following diagram:

Classic stand alone enclosure:

(*)

230 Vac

RJ 11 - PSTN

RJ 11 - LL

V24

access

(*) Wall mount power supply. Only the power module provided with the unit must be used.

Metallic enclosure: provides 3 RJ11 sockets:

 Standard SDM version:

230V

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 SDM version + alarm relay option:

230V

ALARM

Industrial

Equipment

Power On: When the modem is connected, switch the power switch to the "On" position. (*) Power supply DC adaptator or Power supply cable.

2.2. Rackmount version

Package Contents:

Before installing your modem, check all these items are present:

• One AJ 2885 card

• One RJ11 phone cable (as an option)

• A leased line RJ-11 cable (as an option)

• A CD-ROM that includes

• AT command set reference manual

• User manual

• Software (as an option)

If you ordered the busy out function, check that the K3 option is available. This function forces the line to be active when there is:

• A faulty power supply,

• No answer to a call after N rings (N is set by the S20 register). This maybe due to a non-

connected data terminal (DTR/108 absent).

• N successive ineffective connection sequences (N is set by the S20 register). This maybe

due to a bad connection to the telephone line.

This option is particularly useful for line pooling applications, and in case of fault, incoming calls are switched to another modem in the pool.

Your AJ2885 board provides an interface to the AMS controller board that is an option to your AMS16 rack. Refer to the controller card manual for managing the AJ2885 modem through the controller card.

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Installation: See rack operation manual to install your modem. F ind an empty location in the rack and insert the AJ 2885 card into its card guide.

Connection : Connect your modem from the rear of the rack, according to the following diagram:

J6 : DUMBJ9-J21 : V11 / V28

K3-J8 : Busy-out

SW5

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Power On:

Inserting the modem card connects it to the power supply of the rack. Power-on is carried out by the power switch located at the rear of the rack.

Make sure the front panel screws are well fixed onto the chassis so that the modem card is well

onnected to the AMS back plane. c

2.3. Switch and Jumper settings

2.3.1. Dumb mode : J6 jumper

When set in the ON position, this jumper disables the AT and V25Bis commands. This may be interesting for synchronous connection, or to protect the configuration of the modem set for answer mode.

2.3.2. SW5 switch

This switch does not apply on the FT model.

The following data terminal signals can be forced ON through these four switches :

Switch Signal On position effect AT Command

SW5-1 DTR The 108 – DTR signal from the terminal is ignored AT &D0

SW5-2 CD The modem provides a permanent 109 – CD signal AT &C0

SW5-3 DSR The modem provides a permanent 107 - DSR signal AT %D0

SW5-4 CTS The modem provides a permanent 106 – CTS signal AT %C0

2.3.3. V11 – V28 terminal interface : J9 – J21 jumpers

This switch does not apply on the FT model.

The J9-J21 jumpers set the data terminal interface for :

• V24-V28 or RS232 : jumpers in the 1–2 position

• V11 (X21 / V35) : jumpers in the 2–3 position

In this case, jumpers J19, J20 and J21 connect a 560 Ohm impedance on the V11 receivers the the TD, XCLK and DTR signal respectively.

These jumpers are described in a dedicated appendix at the end of this manual.

AJ 2885 P - Page 15

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2.4. Power-up self-test

When the modem is turned on, an automatic self-test is performed, which tests:

• Its program memory

• Its data memory

• Its stored memory

• Its data processing unit

The test lasts a few seconds and ends with a series of:

• Different tones if the test is ok,

• The same tone if a failure is detected. This failure is stored in the S19 register or detailed by

the ATi7 command. See chapter 6 "Troubleshooting".

The self test result is displayed on the front panel LCD of the 2885 SDV version.

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3. Operation

The modem operation is usually controlled through its terminal interface that connects to a computer or a terminal, and through a set of AT commands.

On the computer (a PC for example), start a communication software such as the Windows HyperTerminal (HyperTerminal and Windows are trade marks of their respective owners).

The AJ2885 modem adapts automatically to the speed (300 to 115,200 BPS) and format of characters sent by the computer when it receives the following characters :

AT or at

3.1. Syntax of AT commands

Commands are built as follows :

AT xxxxxxx <RC>

• AT is the command prefix

• xxxxxx is the actual command and parameter

• <RC> complete the command line. This character corresponds to the ‘Carriage

return’ or ‘Enter’ key f the keyboard.

The following commands do not comply with this syntax :

• A/ or a/ to repeat the last command

• +++ to escape from connect data mode to local command mode

• ^Z^Z^Z to escape from connect data mode to remote command mode

Modem sends back an answer when a command is competed :

• OK if the command is successfully completed

• ERROR in case of error in the command line

• CONNECT (or another message) in case of action command to place a call for

example

The AT and V25Bis reference manual provides the detail of the commands.

3.2. First dialogue

You can then try the following commands :



AT<RC> (<RC> or ENTER )



Modem answer : OK



ATI3 <RC>



Answer: AJ 2885P-FPVF Rev-5.10*

* example of product identification



AT&S <RC>



Answer : modem sends multiple pages of configuration and status.

This first dialog being completed, the chapter 5 for configuration and the reference manual provide detailed description of the modem commands.

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4. Front panel operation

4.1. Operating modes

This chapter describes the operation of the six LEDs front panel version of 2885 modem.

4.1.1. Operating modes

The modem can operate in one of the four following modes:

1. IDLE MODE:

• The modem enters the idle mode after powering up if it passes its power-up self test. Beeps

announcing the end of the test can be heard unless the speaker is turned off (see corresponding command).

• From this mode, the modem will enter in command mode by receiving a command from the

DTE, or in ONLINE mode if an automatic call is initiated from the front panel, or if a call is received when the modem is configured to answer calls.

2. COMMAND MODE:

• The modem enters the command mode when it receives a recognized command. In this

mode, commands are interpreted and executed. (Configuration set up - automatic call request...). The modem also enters in command mode when it recognizes an escape sequence in the data when in an on-line rude.

3. ONLINE MODE:

• The on-line mode starts, when detecting a carrier signal from a remote modem or when

dialing is successfully completed.

4. TEST:

• The test mode is selected when in a command mode using appropriate test commands.

4.1.2. The Front Panel

The front panel of the modem has six red LEDs and one push button. The different LEDs indicate the state of the modem and the status of the self test sequence.

AJ 2885 P - Page 18

DTR DSR/RI CD TXD RXD LINE MODE

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T he following table list these functions:

LED Circuit Function

DTR

(Data Terminal Ready)

108 Indicates that the data terminal equipment connected to the

modem is ready for data communication. On if DTR is set or fllashing if DTR-108 is not set. Bad Eprom checksum during self test.

DSR/RI

(Data Set Ready/Ring Indicator)

107/125 Flashes when an incoming ring is received (125/RI). Remains

lighted permanently when connecting. On leased line, the Originate modem flashes 10 times per second and the Answer one 4 times per second, when waiting for carrier. Also bad RAM causes flashing of light during power up test.

(Carrier

Detect)

109 Indicates that the remote modem's carrier signal has been

received by the modem. In test mode, this light will flash if the test is negative. Also on if bad non volatile ram checksum during power up test.

TXD

(Transmit

Data)

103 Flashes as data is transmitted by the modem.

RXD

(Receive

Data)

104 Flashes as data is received by the modem.

LINE - Indicates the mode of connection:

Permanent: Leased Line Flashing: PSTN or V23 half duplex Off: Command Mode Equally a sign of bad DSP during power up test. PSTN Off: 300 bps Flash 1 Time = 1200 bps Flash 2 Times = 2400 bps Flash 3 Times = 4800 bps Flash 4 Times = 9600 bps Flash 5 Times = 12000 bps Flash 6 Times = 14400 bps Flash 7 Times = 16800 bps Flash 8 Times = 19200 bps Flash 9 Times = 7200 bps Flash 12 Times = 21600 bps Flash 13 Times = 24000 bps Flash 14 Times = 26400 bps Flash 15 Times = 28800 bps Flash 16 Times = 31600 bps Lighted permanent = 33600 bps

4.1.3. The Push Button

The MODE push button programs different functions depending on the current mode.

IN COMMAND MODE:

• Performs automatic dialing of the number stored in memory or holds the line in originate

mode if no number was stored, or starts answering if rings were detected on the line. The length of the press is signaled by a single flash of the DSR LED. The PSTN number may have been dialled by the telephone set for example.

• A two-second push holds the line in answer mode. The length of this push is signaled by

two flashes of the DSR LED.

• If the button is pressed for more than 10 seconds (three flashes of the DSR LED), the

modem resets.

IN ON-LINE MODE:

• When the modem issues a beep to report a dial backup connection, then pressing the

button stops the alarm beep.

• Pressing the button once disconnects the modem and selects idle mode again.

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4.1.4. Configuration Select

Holding MODE for more than 10 seconds will initiate a hardware reset. If the switch is still pressed after some beeps are heard at power-up, the modem will enter

configuration mode. The front panel LEDs DTR, DSR, CD and LINE indicate which configuration the user can select.

here are listed in the following table:

DTR DSR CD LINE Configuration

0 0 1 1 Factory configuration "0" async dial configuration

(AT&F0)

0 1 0 1 Factory configuration "1" sync 2WLL configuration

originate (AT&F1)

0 1 1 1 Factory configuration "2" sync 2WLL configuration

answer (AT&F2) 1 0 0 1 Factory configuration "3" V25bis HDLC dialer (AT&F3) 1 0 1 1 Factory configuration "4" V25bis BSC dialer (AT&F4) 0 0 1 0 User configuration "0" (AT%M0) 0 1 0 0 User configuration "1" (AT%M1) 0 1 1 0 User configuration "2" (AT%M2) 1 0 0 0 User configuration "3" (AT%M3) 1 0 1 0 User configuration "4" (AT%M4)

Each of the configuration will stay on for 2 seconds while the MODE button is pressed. Releasing the button will select the new configuration, and this configuration will be loaded after power up. Immediately after the power up test (after the beeps), the LEDs will indicate which configuration is loaded for 2 seconds.

4.1.5. Factory configuration detail

The following parameters differ from the factory 0 configuration.

• Factory 1 : E0 Q1 &D0 %D2 &C1 %C1 &R0 @A0 &M1 &L2 *LG0 *M1

• Factory 2 : E0 Q1 &D0 %D2 &C1 %C1 &R0 @A0 &M1 &L2 %O0 *LG0 *M1

• Factory 3 : E0 %D2 &C3 %C3 &R0 @V3 %B1 @A0 &M1 *LG0 *M1

• Factory 4 : E0 %D2 &C3 %C3 &R0 @V4 %B1 @A0 &M1 *LG0 *M1

T hese configurations may change without notice. Please check on your modem.

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4.2. Configuration through front panel LCD and keypad

This chapter describes states of the front panel lights and operation of the LCD and keypad.

4.2.1. The four LEDs indicate the state of the modem

LED Circuit Function

DSR/Ri 107/125 Flashes when an incoming ring is receiving (125-Ri).

On leased line, the Originate modem flashes 10 times per second and the Answer one 4 times per second, when waiting for carrier.

When ON when DSR is activated, when the modem is off hook and when

connected.

CD 109 Indicates that the modem is connected to the remote one, i.e. remote

carrier is detected. DATA 103/104 Flashes as data are received and transmitted by the modem. DTR 108 Indicates that the data terminal equipment connected to the modem is

ready for data communication flashes if DTR-108 is not active.

4.2.2. LCD displays

The LCD displays two lines of 16 characters:

 It displays results of the self test after power on.  The main menu displays successively states of the modem (connection, speed, DTE interface

status) and branches to configuration and dialing sub-menus.

 Theses menus are described on the menu map as a separate document.  Three keys are used to pass between menus: down

↓

key accesses next item in a list, enter ↵ key validates a choice or branches to a sub-menu, and left ← key comes back one step to the main menu with no effect on last choice.

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4.2.3. Three keys operation

↵ ENTER : This key validates the displayed choice or option, according to the following

examples:

Case 1 PRESS ENTER FOR

CONFIG CHANGE

Enter branches to the configuration sub-menus.

Case 2

CHANGE ?

VISUAL DISPLAY

Enter branches to the AT display parameter submenus.

Case 3

COMMAND ECHO

ON > OFF

Enter selects the new value of the parameter located on the right of the « > » symbol.

↓ DOWN : This key displays next item of the menu, i.e. next menu, or parameter or value,

according to the following examples:

Case 1

SELECT

CONFIGURATION?

↓

STORE

CONFIGURATION ?

Displays next menu.

Case 2

COMMAND ECHO

ON CHANGE?

↓

QUIET

OFF CHANGE ?

Displays next parameter.

Case 3

COMMAND ECHO

ON > OFF

↓

COMMAND ECHO

ON > OFF

Displays next value of the parameter.

← LEFT : This key comes back one step to the previous menu, according to the following

examples:

Case 1

CHANGE ?

MODEM OPTION

←

AJ 2885 SDVF

REV 5.01

Comes back to main menu.

Case 2

COMMAND ECHO

ON CHANGE ?

←

CHANGE ?

VISUAL DISPLAY

Comes back to configuration menu.

Case 3

COMMAND ECHO

ON > OFF

←

COMMAND ECHO

ON CHANGE ?

Leaves the parameter unchanged.

From the main menu, LEFT ← key is a multiple action key depending on the modem

configuration and connection status:

• During training, left key aborts the connection and restores command mode,

• In on line mode, left key disconnects,

• In idle mode, if the modem is configured in leased line mode, left key initiates a leased line

training,

• In idle mode when incoming rings are detected, left key initiates answer mode (acts as an ‘ATA’

command),

• In idle mode when the modem is configured in dial up mode (i.e. not in leased line mode), left key

initiates a calling mode connection. The modem dials the first automatic number found in the phone book, or just hangs up in calling mode if any (acts as an ‘ATDS’ or ‘ATD’),

• In leased line mode with dial backup option set, during training on lease line, left key initiates dial

backup,

• During dial backup with alarm beep, left key stops beeping,

• During dial backup without alarm beep, left keep aborts the dial line connection and starts

training on leased line.

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4.2.4. Example

How to store a phone number in the phone book as would this AT command:

AT&Z3:CXR:FOX:33237:::A

• Number 3 in the phone book (range 0 to 99),

• « CXR » is the name field,

• « FOX » is the password field,

• LINK and CONFIGURATION fields are both left blank,

• « A », attributes means this number is dialed from the front panel or from the DTE interface

(DTR, 108-1).

NOTA : Please refer to the AT command reference manual for more details on the phone book fields and usage (see AT commands: &N, &Z, DS).

While editing the number, the modem keeps modification in its memory:

• You may stop editing, and restart later,

• This memory is not saved: modification will be lost in case of reset by ATZ command or

power lost,

• To save memory and make modification permanent, you must validate the last menu of the

number editing: « PRESS ENTER TO SAVE NUMBER MEMORY ».

# On display Press the key Comments

PRESS ENTER FOR

CONFIG CHANGE

↵ to access configuration menus, then ↓ to display :

CHANGE?

PHONE NUMBERS

↵ to access phone number editing

sub-menus

CHANGE? P00:O

123456

↓ to access number 3

00 already exists in this example. Look at the name on line 1 an the number on the second line,

CHANGE? PO3 :

↵ to start editing number 3

03 is empty in this example

P03:--NAME--?

↵ to edit the NAME field ↓ would access to the

PASSWORD next field

PO3:--NAME--

↓ three times to displays « C » character. Then leave ↓ pressed

until you get a « C » again

Note that the ? symbol is gone. Note the cursor position while editing

PO3:--NAME--

↵ to validate this first character,

the cursor moves on the right.

Press ↓ to get the « X », then ↵, then ↓ to get the « R », then ↵

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# On display Press the key Comments

AJ 2885 P - Page 24

PO3:--NAME--

CXR_

↵ no character is displayed on the

cursor: ENTER key validates this field and initiate next field editing

↵ validate a field on a

blank cursor

PO3:--PASSWORD--?

Just like steps 5 to 8, press :

↵ once to start editing, ↓ to get « F », then ↵

(« F- »)

↓ to get « O », then ↵

(« FO- »)

↓ to get « X », then ↵

(« FOX- »)

↵ to validate « FOX », as the

password and access to the next field of this number

PO3:--NUMBER--?

Again like previous steps, press:

↵ once to start editing, ↓ to get « 3 », then ↵

(« 3- »)

↓ to get « 3 », then ↵

(« 33- »)

↓ to get « 2 », then ↵

(« 332- »)

↓ to get « 3 », then ↵

(« 3323- »)

↓ to get « 7 », then ↵

(« 33237- »)

↵ to validate « 33237 »,

Note that dialable digits are available as well as control character. Refer to the dial command ATD in the reference manual

PO3:--LINK--?

NONE

↓ to get next field

PO3:--CONFIG--?

NONE

↓ to get next field

PO3:--ATTRIBUTE--

NONE

↵ to edit attribute field

PO3: NONE

AUTO CALL > ON ?

↵ to validate this choice

Note the attribute on the first line

PO3: A

DIAL OUT > ON ?

↓ to display next attribute

PO3 A

PASSWD ACCS>ON ?

↓ 4 times to pass other attributes

and display next menu

SAVE MEMORY

↵ to save these changes in

permanent memory, or

← to ignore and return to

configuration menu (step 2) without saving memory

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5. Configurations

This chapter describes commonly used configurations through the AT command set: These commands may be used as part of software drivers for example. The same configuration can be achieved through the LCD and keypad front panel. Refer to the LCD menu description in chapter 2.5.

5.1. Factory configuration

This configuration applies when the modem is first powered on, or after complete reset by the following commands:



AT&W255 <CR>



Answer : OK



ATZ <CR>



Answer : OK

This configuration is designed for most common applications and has the following characteristics:

DTE - V24:



Normal CD, DTR,



DSR and CTS forced on. Automatic answer S0 = 2 Automatic hunt: V34, V32bis, V32, V22bis, V21 and V23 modes Error correction and data compression: V42bis and MNP automatic mode (*M2) Flow control: RTS/CTS (*LG2) This configuration can be modified for a specific application. The following examples describe

the most common applications.

5.2. Selecting the modem speed

Introduction :

Modem provides two interfaces : the DTE interface connected to the terminal, and the DCE one to the remote modem. This is described by the following picture of a point to point connection :

Terminal

Modem

Terminal

DTE

DCE DCE

DTE

Modem adapts these two interfaces that may work at different rates : these are DTE and DCE speeds. The DTE speed applies on the terminal interface rate (between the modem and the terminal) while the DCE speed applies on the line rate (between both modems).

Controlling modem speed : in default factory configuration, modem is set for automatic mode also said Autobaud, which satisfies most cases of use. In this case, modem defines the DCE speed upon the DTE speed which was automatically detected whe the last AT command was received.

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Modem speed can be controlled thanks to the following commands. Asynchronous and Synchronous modes : modem can provide a synchronous or

asynchronous interface to the terminal

Synchronous mode : DTE speed is the same as the DCE speed, i.e. the terminal speed might change upon connection from configuration speed.

Asynchronous mode : DTE speed does usually not depend on DCE speed, it is a constant rate interface. The terminal speed does not change from configuration speed upon connection. The opposite applies on two configuration cases :

(1) in direct mode : *M0 command

(2) in disabling the constant DTE modem : *C0 command

Autobaud : this features provides :

(1) an automatic detection of the terminal data format and speed when receiving AT

commands,

(2) an automatic adaptation of the connection (DCE) speed to the speed lower or equal

to the terminal one as to avoid its overflow.

V32Bis and V34 : these modes of connection support the same speedfrom 4.8 to 14.4 KBPS. The @OM command selects the desired mode which is especially suitable for leased line connection.

Modulation – DCE speed : the @M command selects the connection (DCE) speed when the Autobaud feature is off (parameter different from @A1)

Buffering and flow control : in asynchronous mode and especially when the DCE speed is lower than the DTE speed, modem can buffer data received from the terminal in order to adapt the data rate to a lower speed. The AJ2885 modem provides a buffer of about 1000 characters. Modem can run a flow control process when this buffer is about to get full in order to stop the sending terminal.. The same buffer and feature is available in the modem to terminal direction.

Buffers and flow control are available in normal mode (*M1) and with error correction and data compression (*M2 and M3). On the other hand, modem is a transparent channel in direct mode (M0) and in synchronous mode (&M1) : buffering and flow control are then not possible in both modes.

The flowing picture summarizes the action of these commands depending on their parameters. This assumes that the last AT commands were sent to the modem at a speed of 38400 BPS, and were :

AT@An

and then eventually AT@Mn :

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CONFIGURATION PARAMETER (38,400 BPS) CONNECTION RESULT Autobaud Async / Sync Mode DCE sped DCE speed DTE speed @A1 : ON &M1 : Sync Do not care Do not care 33600 33600 (1) @A2 : DTE @A0 : OFF

&M1 : Sync Do not care @M15: 28800 28800 28800 (1)

@A1 : ON &M0 : Async *M1 : normal

*M2 : auto

*M3 : exclusive

Do not care 33600 38400 (2)

@A1 : ON &M0 : Async *M0 : direct Do not care 33600 33600 (3) @A2 : DTE @A0 : OFF

&M0 : Async *M1 : normal

*M2 : auto

*M3 : exclusive

@M4 : 9600 9600 38400 (4)

@A2 : DTE @A0 : OFF

&M0 : Async *M0 : direct @M4 : 9600 9600 9600 (5)

Remark :

(1) The synchronous mode parameter &M1 is dominating : DTE speed depends on the

connection speed. It may also vary during connection in case of retrain or fall back negotiated with the remote modem for example.

(2) Except for direct mode (*M0), Autobauding (@A1) is dominating : DCE speed

depends on the terminal DTE speed. The default factory configuration is based on this configuration.

(3) Direct mode parameter (*M0) is dominating : DTE speed change to the DCE speed

upon connection. Any speed change should be avoided in asynchronous mode since the DTE terminal could not adapt to any further speed change.

(4) Autobauding is either limited to the DTE speed detection (@A2) or disabled (@A0) :

DCE connection speed can be set up independently thanks to the @M parameter. DTE terminal speed remains unchanged in asynchronous mode (constant DTE speed).

(5) Again Autobauding is either limited to the DTE speed detection (@A2) or disabled

(@A0) : the @M parameter sets the DCE connection speed independently from the DTE speed. But, DTE terminal speed becomes the DCE speed upon connection because of direct mode (*M0). Again, any speed change should be avoided in asynchronous mode since the DTE terminal could not adapt to any further speed change.

5.3. Rate and connection mode selection

The AJ 2885 provides several solutions to determine the mode of connection.

 Selecting connection mode for speeds of 2400 to 19200 BPS

: the modem can connect these speeds in V34 mode or in older V22, V22Bis, V32Bis or V32 is modes. The AT @OM command selects the wanted mode of connection This command should be left as @OM3 for automatic mode adaptation since the V34 mode is designed to recognise V32 / V32Bis remote modems during the handshake.

 Autobaud

: the modem recognises automatically the speed and the data format of the terminal when it sends an AT command. If the 'full' autobaud is active - AT @A1 - then the modem will adapt the connection rate to the nearest lower connection speed. This is the

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default factory configuration. The autobaud must be changed to select a special speed. It can be limited to the DTE autobaud - AT @A2 - which means that the modem still recognises the terminal data format and speed but does not change the connection rate. Or it can be disabled - AT @A0 - which means that both the DTE data format and speed, and connection mode are selected by Commands.

The following picture lists all connection modes on the first row, and the configuration in full autobaud and limited or disabled autobaud.

Rate - modulation Modem autobaud : AT@A1

DTE speed / AT command

DTE autobaud : AT@A0 or

AT@A2

AT command

300 - V21 300 / - @M0

1200T,75T - V23 Modem can not be autobaud @M10

75R,1200T - V23 Modem can not be autobaud @M11

1200 - V22 1200 / AT @OM2 @OM2 @M1

2400 - V22 Bis 2400 / AT @OM2 @OM2 @M2

4800 - V32 4800 / AT @OM2 @OM2 @M3

9600 V32 9600 / AT @OM2 @OM2 @M4

7200 - V32 Bis V32Bis fall down speed @OM2 @M9

12000 - V32 Bis V32Bis fall down speed @OM2 @M5

14400 - V32 Bis V32Bis fall down speed @OM2 @M6

2400 - V34 2400 / @OM3 @OM3 @M2

4800 - V34 4800 / @OM3 @OM3 @M3

7200 - V34 V34 fall down speed @OM3 @M9

9600 - V34 9600 / @OM3 @OM3 @M4

12000 - V34 V34 fall down speed @OM3 @M5

14400 - V34 V34 fall down speed @OM3 @M6

16800 - V34 V34 fall down speed @OM3 @M7

19200 - V34 19200 / @OM3 @OM3 @M8

21600 - V34 V34 fall down speed @OM3 @M12

24000 - V34 V34 fall down speed @OM3 @M13

26400 - V34 V34 fall down speed @OM3 @M14

28800 - V34 V34 fall down speed @OM3 @M15

31200 - V34 V34 fall down speed @OM3 @M16

33600 - V34 >= 38400 / @OM3 @OM3 @M17

Notes :

 V34 mode on lease line should be better used without the V8 preamble. This can be

achieved by the command AT @OM1 instead of AT @OM3.

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 The status page 3 details all information on DTE and modem speeds, data format, parity,

synchronous or asynchronous mode (answer to the AT&S3 command).

5.4. Asynchronous or synchronous mode :

The AJ 2885 distinguishes the command and the connection modes :

 The command mode is defined by the AT @V command : asynchronous AT (@V1),

asynchronous V25 Bis (@V2), V25Bis HDLC (@V3), V25 Bis BSC (@V4) or disabled (@V0).

 The connection mode is defined by the AT &M command : asynchronous (&M0) or

synchronous (&M1).

5.5. Configuration of the asynchronous mode :

The following features apply on asynchronous connection mode.

5.5.1. Error correction and data compression:

The modem is set in default factory configuration in automatic mode so that it can negotiate the

best protocol with the remote modem.

A flow control should be configured in asynchronous mode to avoid loss of received data.

The following commands apply :

Command Function

*M0

*M1

*M2

*M3

direct mode, no protocol. The modem is

transparent to the transferred data. No flow control is possible. The XON.XOFF flow control is passed over the line.

Normal, no protocol. The modem buffers

transferred data. Flow control can be RTS-CTS or XON XOFF.

Automatic. The modem tries to negotiate V42

or MNP modes

Exclusive. The modem only accepts

connection in the configured protocol.

*T Protocol type : MNP (*T1), V42 (*T2),

automatic (*T3).

*G Error alarm : the internal high speaker may

beep when it detects an errored packet in the received data flow (*G0 : disable, *G1 : enable).

&M0 Selects the asynchronous connection mode.

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5.5.2. Flow control:

Through Xon-Xoff : :

AT *LG1 generates a local Xon-Xoff,

AT *LR1 answers to the local Xon-Xoff

These commands are the original AJ commands. For compatibility with standard general purpose modems the following command may be used : AT &K4

Through RTS-CTS :

AT *LG2 generates a CTS flow control

AT * LR2 answers to the RTS flow control

AT %C1 sets the CTS signal for flow control

AT&R1 sets the RTS signal for flow control

The *LG and %LR commands are the original AJ commands. For compatibility with standard general purpose modems the following command may be used : AT &K3

5.6. Configuration of the synchronous mode

AJ2885 modem provides synchronous connection in transparent mode, i.e. the same speed applies on both DCE and DTE interfaces.

The following parameters should be adjusted for synchronous connections:

Command Function

&M1 Selects the asynchronous connection mode.

*M 0. Direct mode. The modem is transparent to the transferred data.

Transfer delay is the lowest possible.

1. Normal mode. The modem buffers bytes and re-synchronises bit to the receive and transmit clock whenever possible.

&X 0. Internal clocks. The modem generates the clocks on V28 interface

pin 15 (pin 13 and 15 in V11 interface)

1. External clock. The modem uses the terminal clock provided on V28 interface pin 24 (pin 11 and 24 in V11 interface). This clock must be well adjusted to the connection mode rate.

2. Slave clock. The modem synchronises from the received carrier and provides these clocks on V28 interface pin 17 (pin 12 and 17 in V11 interface).

Note : some synchronous terminals sends permanent data even when the modem are not connected. To prevent the modem to interpret these data as configuration command, it can be set in dumb mode by the AT @V0 command, or by the X1 jumper. (1) The &Xn parameter defines the transmit clock behaviour. A typical modem connection

sets one modem for internal clock and the other one in slave mode.

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(2) Whenever the DTE terminal issues the clock should the modem be set for external clock

(&X1). Frequency accuracy of the DTE clock must be compatible with the modulation.

(3) In case the terminal may issue a permanent data flow even out of connection could the

DUMB mode be set to avoid any spurious commands or escape to command mode sequences. Either set the DUMB jumper on the modem board or use the @V0 command. When DUMB mode is set by the @V0 command then coming back to command mode must be achieved by restoring the factory default configuration in pressing the front panel button during power-up : the use of the DUMB mode jumper (J6) may be an easy alternatve. The escape to command mode sequences may be disabled by resetting the S12, S26 and S43 registers.

5.7. Automatic dialing directory

The AJ 2885 has a non volatile memory that allows the user to store frequently used numbers. Each phone number can have a name and control sequence associated. So instead of remembering every number, the user can type in the recipient name, thus greatly easing the task of making a connection.

The following example shows how to store a number, name and control sequence at location 3 of the directory memory.

Dialing a direct line, send the command:



ATDT36062424 <CR>

Dialing via a PABX, send the command:



ATDP0W36062424 <CR>

Storing a number in the directory (number 3), send the command:



AT&Z3:NAME:CONTROL:P0W36062424:::A <CR>

Show directory contents, send the command:



AT&N <CR>

Dialing from the directory:

• The ATDSn command dials the stored telephone number specified by n where n is 0 to 99.

• By CCITT 108/1 operation. The modem autodials a stored number when an off-to-on

transition of the DTR occurs. The modem disconnects when an on to off transition of the DTR occurs. AT&D1 command select the dialing mode of the DTR signal.

• By the phone number name by the ATD$name command.

5.8. Leased line

A leased line is a permanent analogue telephone connection between 2 sites. Therefore connection is started with a direct training, i.e. without dialling.

Depending on the selected configuration, the following commands are sent to the modem. (See reference manual for a description of these commands).

Configuration Originating modem Answering modem

2-wire line 4-wire line Dial back up 1234 back up dial number Recovery lookback

AT&L1%O1&W <CR> AT&L2%O1&W <CR> AT%U1 AT&Z:::1234:::A <CR> AT%L1&W <CR>

AT&L1%O0&W <CR> AT&L2%O0&W <CR> AT%U1 S0=1 AT%L1&W <CR>

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After this leased line configuration is saved by the AT&W command, the modem will start training on leased line if :

• it is reset by ATZ or by a power restart,

• the front panel button is pressed.

For V34 mode of connection, better disable the V8 preamble by the command : @OM1 Automatic Dial Backup : the master or Originate modem is in charge of initiating the dialup

connection if case of leased line failure. Modems issue alarm beeps, set the backup 117 signal and flash the DSR front panel led once the dialup connection is on. AJ2885P modems has an embedded real time clock and calendar to disable dial backup connection outside working week-day and week-end periods as to optimise the cost if the dialup connections.

Leased line look back : modems check for leased line recovery when in dial backup from the S56 timer (in minutes). Look back is continuous and safe through a specific handshake as to avoid ineffective retrains on leased line.

Permanent link on dialup line : a leased line like connection can be performed over dialup line by setting S61 register to 1 (ATS61 = 1). This special mode does not comply with dialup requirements : it is the user’s responsibility to use this mode on a private line only.

5.9. V23 and Bell 202 T Modes on Leased Line

AJ2885P modem provides several V23 – BELL202 modes on leased line as summarized by the following picture :

Type of connection AT Command Model

Classical 1200 / 75 V23 mode : on a 2 or 4 wire line, full duplex link at 1200 BPS one way (@M11 modem to @M10 modem) and 75 BPS the other way.

1200 BPS sender modem: @A2@M11&R1

1200 BPS receiver modem: @A2@M10&R1

All

Reversing 1200/75 V23 mode : the same mode can be reversed through RTS signal control.

@M10 or @M11 command may be used since the transmission mode depends on the RTS signal.

@A2 @M10 (or @M11) &R2

All

1200 / 1200 half duplex : this mode does not provide the 75 BPS return channel, and applies on 2 or 4 wire lines. Reversal is under RTS signal control.

@A2 @M10 &R3 S26=10 All

1200 / 1200 full duplex : a full duplex FSK link on a 4 wire line only.

@A2 @M10 &R1 @OT1 BP ant BD

1200 / 1200 half duplex or carrier controlled mode or Master – Slave mode : the same mode may be used for multi-point or master- slave link. Master modem is set for permanent transmission while slave modem transmission is under RTS control.

The reversal delay is as fast as 30 ms which is adjusted by the S26 register (in ms)

Maître : @A2 @M10 &R1 @OT1

Esclave : @A2 @M10 &R3 @OT1 S26=30

BP and

DTE interface signal in half duplex configuration :

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• transmission is controlled by RTS : &R2 or &R3 parameter

• Transmission acknowledgement is provided by CTS : %C1 parameter

• Carrier detection (remote modem signal) is provided by CD : &C1 parameter

Half duplex reversal delay : this delay is set by the S26 register

• expressed in Nx10 ms for connection without 75 BPS return channel (case 2 and 3 of the

previous picture) with a minimal value of 8 i.e. 80 ms

• expressed in Nx1 ms for 1200/1200 full duplex connection (case 5 of the previous picture)

with a minimal value of 30, i.e. 30 ms. This mode applies on AJ2885P-Bxx models only.

The sending modem starts the S26 timer when the RTS signal rises, and sets the CTS signal when the S26 timer is complete. This delay corresponds to the remote modem synchronization time.

Bell 202 T : Bell 202 specific frequencies are used thanks to the B1 command.

5.10. Saving user configurations

The AJ 2885 modem can store up to 5 user configurations. The AT&Wn command saves the current configuration in non-volatile memory (n = 0 to 4). This

configuration is saved even when the modem is turned off. The modem will load the last saved user configuration at power-up.

5.11. V54 - Maintenance

The AJ 2885 modem provides V54 loop test functions. The A terminal can monitor the following tests :

• Analogue local loop or B3: the A modem connects on its own carrier. The A terminal can

check characters it sends are well returned. The good operation of the A modem is tested.

• Remote digital loop or B2 : the B modem sends back all characters received from the line.

The A terminal can test the entire link to the remote modem.

A A B B

5.11.1. AT command operation

The status page 10 lists all V54 test features ( command AT&S10 )

♦ B 3 : local analogue loop

: the A modem is in local command mode. The local loop may

be started by the following commands :

♦ AT&T1 : simple loop. The modem connects and sends a CONNECT xxxx message. All

characters sent by the A terminal are sent back after modulation.

♦ AT&T8 : in the same kind of local loop the A modem sends and checks automatically test

characters. The error counter is displayed at the end of test.

♦ End of test : the test ends at the test timeout defined by S18, or by entering an escape

sequence ( '+++' )and an AT&T0 command

♦ Front panel LED: the CD led is on when the modem is connected, DSR led stays off. ♦ Example :

A A

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Boucle 3

AT&T1 <RC> ....................................... start the test

CONNECT 19200 ................................ Connect message

ABCDE ................................................ characters sent by the terminal

+++....................................................... escape to command mode

AT&T0.................................................. End of test command

♦ Note: the connection status ( AT&s8 ) page can be displayed during the test after an

escape to command mode.

♦ B 2 : remote digital loop

: modems are connected before starting the test.. the remote

loop on the B modem is initiated from the A modem by the following commands :

♦ AT&T6 : simple loop. The A terminal checks returned characters. The connection must be

done without any error correction protocol ( AT*M1 )

♦ AT&T7 : same loop with automatic character sending and checking by the A modem. It

displays the error counter at the end of test. The connection must be done without any error correction protocol ( AT*M1 )

♦ End of test : the test ends at the test timeout defined by the S18 register, or by entering an

escape sequence ( '+++' ) and an AT&T0 command.

♦ Front panel LED: on the B modem, the DSR led flashes and the CTS signal is dropped

during the test.

♦ Example :

A A B B

Connection at 19200bps

B 2 +++

OK ..........................................................escape to local command mode on

modem A AT&T6

OK ..........................................................requests a remote digital loop to B

modem

ABCDE...................................................characters issued by the A terminal are

sent back by the B modem +++ OK

AT&T0 ....................................................End of test

ATO........................................................Return to connected mode and

reactivate the data link between the A

and B terminals.

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6. Security and memory

6.1. Principles

The modem contains three types of memory:

The FLASH-EPROM, where factory configuration is stored permanently, The RAM, where the modem configurations are stored temporary, The NVRAM where semi-permanent data is stored even when the modem is turned off.

The first time your modem is turned on, or after a complete reset, these three memories are identical and set to the default factory configuration.

The AT&Wn command saves the current configuration in the non-volatile memory, (n = 0 to 4) or activates a factory configuration for the next reset (n=5 to 9).

For example : AT &W0 save and activate the current user’s parameters in bank 0 AT &W5 activates factory configuration bank 0 for next reset, with no change on the

other user’s configuration banks. The last stored user configuration will be loaded automatically on next power-up. These memory operations are shown on the following diagram:

PRO

NV-RAM

Stored

configuration

Power-up

AT%m or

Memory reset

AT&W255

Memory store

AT&W0 to AT&W4

Loading of a factory configuration without loosing the stored memory

AT&F0 to AT&F4

Loading the user configuration

AT%M0 to AT%M4

6.2. The phone directory

Up to 100 phone numbers can be stored in the modem's non-volatile memory, to be used by the

utomatic dialler. a

Save a number

AT&Z0:Directory::11:::A

This command saves automatically the directory in non-volatile memory Dial a number

ATDS0 <CR>

Display the directory

AT&N <CR>

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6.3. Answerback security

This security mode is controlled by the answering modem, and depends on a password exchange which authorizes a modem connection, i.e.:

modem

TDxxx

Training

"AC24Y"

(for example)

ring

ENQ ()

"AC24Y"

control process

Answering

modem

If the answerback matches the one stored in memory within two seconds after an ENQ code was sent by the answering modem, access is granted.

Otherwise the modem disconnects automatically. To store the answerback code, see the following example. The password can be up to 12

haracters long. c

Store answerback (for example: AC24Y)

AT&A:AC24Y:AC24Y <CR>

To disable answerback security

AT&A:: <CR>

6.4. Callback security

HERE

N 3132 N

ATS0=2 AT%SB1 A

AT&Z3:HERE

ATD4142 Calling

Training

Password?

« call B1 »

Disconne cting

Calling (3132)

Training

Password ?

« Call B1 »

Mode ms are connec

THERE

4142

ATS0=2

T%SA1 :CALLB1:3132:::CD

ted

6.4.1. Automatic callback

This security mode is controlled by the answering modem.

It sends a password and then calls back the telephone number associated with that password.

See %SA and %SB commands in the reference manual.

Example:

This double security guarantees password and localization of the calling modem.

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HERE

N 3132

ATS0=2 AT%SB1

AT&

ATD4142 Dialing

Training

Password

« MOBILE

Callback num

3132

Disconnect

Dial (3132)

Training

Modems are con

THERE N 4142

ATS0=2 AT%SA1

Z3:ICI:MOBILE:::

ber ?

nected

6.4.2. Dial number request callback.

The remote user may provide the callback number after password control.

Example:

6.5. Inactivity password

The modem asks for a password when no data passes through it for a presented delay. If this password matches the operator or supervisor password stored in memory then the modem will reconnect otherwise it will drop the line.

S32

: number of minutes of inactivity that will start the password request.

S96

: number of seconds that the modem will wait for the password.

AT%ST 0/1

: number of password trials (0: one trial / 1: three trials).

AT%In: inactivity is detected if:

n=0: no detection, i.e. feature is disabled. n=1: detects transmitted data inactivity. n=2: detects received data inactivity. n=3: detects both received and transmitted data inactivities.

AT%PS

: SUPER:SUPER: stores the supervisor password, (SUPER as an example).

AT%PO

: OPE:OPE: stores the operator password (OPE as an example).

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7. Specifications

7.1. Line side characteristics

Mode Switched network 2-wire leased line 4-wire leased line

Receiver sensitivity - 43 dBm - 33 dBm - 26 dBm Carrier detection: Open threshold < - 48 dBm < - 38 dBm < - 31 dBm Close threshold > - 43 dBm > - 33 dBm > -26 dBm Transmission level: Nominal - 10 dBm - 14 dBm - 14 dBm Maximum - 8 dBm 0 dBm 0 dBm Minimum - 16 dBm - 16 dBm - 16 dBm

AJ2885P (except FTV model) provides transmit levels higher than –10 dBm : it is under user’s responsibility to avoid these levels on the public network, and use them on private lines only for special applications. Maximum received level is –10 dBm only : some higher received level may

duce a loss of performance.

Recommendations

Call/Answer Speed Bps Xmit 0 Xmit 1 Received 0 Received 1

V22 bis Call 2400 1200 1200 2400 2400 Answer 2400 2400 2400 1200 1200 V22 Call 1200 1200 1200 2400 2400 Answer 1200 2400 2400 1200 1200 V21 Call 300 1180 980 1850 1650 Answer 300 1850 1650 1180 980 V23 Call 75 450 390 2100 1300 Answer 1200 2100 1300 450 390 V32 9600 1800 Hz V32 bis 14400 1800 Hz V34 33600 Adaptive

7.2. Automatic call & answer

7.2.1. Originating

Automatic dialling or calling by the originating modem is initiated by:

• "AT" or V25bis commands

• Push button on front panel

• DTR 108/1 being enabled

• Pulse or tone dialing.

Tone recognition occurs when there is:

• A dial request (public network or private exchange).

• A busy line.

• The call monitoring by the internal high speaker can be disabled.

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7.2.2. Answering a Call

When the modem is set in answer mode, it will go off hook after 2 rings (if the command ATS0=2 is sent). This is in conformity with CCITT V25bis recommendation.

7.2.3. Connection - Disconnection

In calling mode, the modem will automatically recognize the remote modem modulation type and adapt correspondingly.

It will disconnect only if:

• The carrier is lost,

• No carrier tone is detected within 35 to 90 seconds,

• No data activity has occurred for the selected period of time dictated by the Inactivity Timer.

7.3. Serial interface

The V24 serial interface of the modem conforms to the DCE specifications. A straight ribbon cable is all that is needed to connect to the DTE port of your computer or terminal. The serial port will automatically recognize DTE speeds up to 115200 bps. This is called auto-bauding.

Both asynchronous and synchronous (except FSK : V21, V23) modes with internal or external clock are supported.

7.4. Fax-mode

7.4.1. Automatic Call and Answer

See 5-2

7.4.2. Transmission Modes

The modem provides the ability to send and receive faxes at speeds up to 9600 bps. T he following modulations are supported:

ITU-T Speed Bps Carrier (Hz)

V21 300 1650 – 1850 V27 ter 2400 / 4800 1800 V29 7200 / 9600 1700 V17 12000 / 14400 1700

7.4.3. Operating Mode

In fax mode, the modem support the following standards:

• Group III Fax, EIA 578 class 1 and class 2 compatible,

• CCITT T4 - T30 recommendations.

7.4.4. Service Class 1 Command Set

The following AT commands control the operation of a class 1 modem/fax:

+FCLASS Service class identification and control +FTS Stop transmission and wait +FRS Receive silence +FTM Transmit mode +FRM Receive mode +FTH Transmit T30 command mode

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+FRH Receive T30 command mode +FCERROR Error code

7.4.5. Service Class 2 Command Set

The following AT commands control the operation of a class 2 modem/fax:

+FCLASS Service class identification and control +FMDL Fax-modem model +FMFR Fax-modem manufacturer +FREV Fax-modem checkup +FBUG Frame report +FAA Automatic answer +FBOR Data bit order +FDCC Fax-modem capability selection +FDIS Capability initialization for transmission +FLID Identification selection of the fax-modem +FCON Remote fax detection +FCIG Identification of called subscriber by CIG +FCSI Identification of called subscriber by CSI +FTSI Identification of calling subscriber by TSI +FDTC Called fax return capability - DCS frame +FDCS Discussed capability for process - DCS frame +FHR Content of received frame +FHT Content of transmitted frame +FBUF? Buffer state +FDT Fax message transmission +FPTS Page transmission result +FDR Fax message reception +FCFR Reception mode confirmation +FPTS Remote reception status +FET End of page status +FHNG End of procedure status +FAXERR Error code

7.5. General characteristics

Dimensions : Length: 260 mm, Width: 170 mm, Height: 35 mm. Weight: 0,7kg. External power supply module: 230V/50Hz. Power consumption: 25mA. Operating temperature: 0 to 50°C. Relative humidity: 0 -> 90% non-condensing.

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8. Troubleshooting

Problem:

T his chapter lists most modem operating problems.

Problem Check

No tone when modem is turned on

Connection to the mains On/Off switch in On position Power supply of the rack and fuse of the card (rack version), DTR indicator on or flashing

Single and continuous tone when modem is turned on

Send commands:

AT&W255 <CR>

ATZ <CR>

Then restart the modem to see if the same continuous tone is heard. See Ati7 section below.

Modem does not answer commands

Flashing of the TXD indicator when sending characters. No flash: check V24 cable. Flashes: <CR> command:

AT&S4 <CR>

and check for a long flash of TXD indicator. Long flash: check V24 cable.

Modem answers "NO DIAL TONE"

Try to dial an outside line using the ADT command. Make sure that you select a valid telephone number and dialling mode (P-Pulse, TTone). Listen to the internal speaker to hear the normal dial tone is heard. If not check the line connection.

Modem refuses to dial

Check for any blacklisting:

AT&NB <CR>

(see reference manual) Turning the modem off and on resets the blacklist.

ATI7 command:

Check the answer to the ATI7 command. It provides a clear message in case of self detected

roblem. p

ATI7 Response

BAD ROM

Code EPROM checksum bad

BAD RAM

Write and read failure in RAM

BAD NON VOLATILE MEMORY

Non volatile memory checksum bad

BAD DSP

DSP bad

ALB FAILED

Analog loopback test bad

If a problem persists after these verifications, contact your near distributor or the CXR "Hot Line" service:

HOTLINE: +33 (0) 237.628.804.

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9. Appendix A - V24 signals

9.1. V24 – V28 interface

Pin number Name CCITT number

1 101 Earth protection 2 TXD 103 Data transmission 3 RXD 104 Data reception 4 RTS 105 Request to send 5 CTS 106 Clear to send 6 DSR 107 Data set ready 7 GND 102 Signaling earth 8 CD 109 Carrier detect 10 (*) Si 117 Dial backup indicator 12 SPD - High speed indicator 15 SCT 114 Time basis for signal elements at transmission.

Source: ETCD 17 SCR 115 Time basis for signal elements at reception 18 TB3 141 Test command. Local loop 3. 20 DTR 108/2 Data terminal ready 21 DB2 140 Test command: remote control of loop 2 22 RI 125 Ring indicator 24 SX 113 Time basis for signal elements transmission. Source:

ETTD. 25 TEST 142 Test indicator.

(*) except FT model

CABL

TXD 3

RXD 2

RTS 7

CTS 8

DSR 6

GND 5

DCD 1

DTR 4

RI 9

E DB9 - DB25

- MODEM 2 TXD

3 RXD

4 RTS

5 CTS

6 DSR

7 GND

8 DCD

20 DTR

22 RI

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9.2. V11-V35 interface:

The AJ 2885P (except FT model) modem provides a terminal interface configurable in V28 or V11 through the J12 to J21 jumpers. The jumpers in position 1-2 set a V28 signal. In position 2-3 they set a V11 signal. To allow any V11 signal (mixed V28 and V11 signals), the J9 jumper must be set in position 2-

3. The following picture describes the confirmation of the interface.

Pin V28 signal V11 signal Jumper

1 101 – P.GND 101 – P.GND 2 103 – TXD 103 A – TXD A (*) J 11 3 104 – RXD 104 A – RXD A J 14 4 105 – RTS 105 – RTS 5 106 – CTS 106 – CTS 6 107 – DSR 107 – DSR 7 102 – S.GND 102 – S.GND 8 109 – CD 109 A – CD A (I A) J 15

9 116 - SS 116 – SS 10 117 – SI 117 – SI 11 111 – S.V24 113 B – SCTE B (*) J 13 12 112 – I.V24 115 B – SCR B J 18 13 ------- 114 B – SCT B 14 ------ 103 B – TXD B (*) 15 114 – SCT 114 A – SCT A J 16 16 ------ 104 B – RXD B 17 115 – SCR 115 A – SCR A J 17 18 141 – TB3 141 – TB3 19 ------ 109 B – CD B (I B) 20 108 – DTR 108 A – DTR A (C A) (*) J 10 21 140 – TB2 140 – TB2 22 125 – RI 125 – RI 23 ------ 108 B – DTR B (C B) (*) 24 113 – SCTE 113 A – SCTE A (*) J 12 25 142 – TEST 142 – TEST

(*) For V11 mode, jumpers J19, J20 and J21 connect a 560 Ohm resistor on the received signals : TXD, SCTE and DTR-C respectively.

J9-J21

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9.3. Dial line connector: RJ11 connector

Pin Signal

1 Not used

2 Telset Tip

3 Tip PSTN

4 Ring PSTN

5 Telset Ring

6 Not used

9.4. Leased line connector : RJ11 connector

Pin Signal 2W Signal 4W

1 Not used Not used

2 Not used Receive Tip

3 Tip XMIT Tip

4 Ring XMIT Tip

5 Not used Receive ring

6 Not used Not used

1 2 3 4 5 6 1 2 3 4 5 6

9.5. Alarm relay connector

Pin Signal

1 Idle contact – Relay 1

2 Common contact - Relay 1

3 Active contact – Relay 1

4 Idle contact – Relay 2

5 Common contact – Relay 2

6 Active contact – Relay 2

AJ 2885 P - Page 44

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10. Appendix B - Country specific information

UK Although this equipment can use either loop disconnect or DTMF signalling, only

the performance of the DTMF signalling is subject to regulatory requirements for correct operation. It is therefore strongly recommended that the equipment is set to use DTMF signalling for access to public or private emergency services. DTMF signalling also provides faster call set up.

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11. Appendix C – General conditions of guaranty

Material and software are guaranteed by CXR manufactures, for one year after the date of delivery, under the following conditions:

1. The material and software guaranty :

Guaranty will only apply if the guaranty coupon is returned to CXR within a delay of one month after the delivery

2. Material :

Any intervention on the material by a person or a maintenance centre which would not have been accepted by CXR during the period of guaranty will abort the application of the guaranty. Any damage due to an accident, a bad use or a non compliant installation, is not covered by the guaranty.

3. Documentation :

The documentation does not guaranty the use of the product. CXR is not held of any responsibility concerning the maintenance, the debugging or the replacement of product documentation.

4. Technical support :

CXR grants to the customer a free hot line support aid at working hours for a limited time of one month after the date of delivery.

5. New versions of products :

CXR may develop improved or modified versions of the software. The cost of the possible update acquirement will be governed by a tariff provided by CXR.