CXR AJ 2885P User manual

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 [phone] - Fax [phone]
Technical support: 33 (0) 237.62.88.04
WEB Site: http://www.cxr.fr
Sales, M
a
CXR S
A
Rue de
28410
A
Tel : 3
3
Fax :
3
TECHNI
C
Web site

User's Manual V34bis Fax-modem - AJ 2885 P
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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
All rights reserved.
Copyright 2003, CXR SA, printed in France, February 2003.
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 : [phone] Fax : [phone]
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
1. INTRODUCTION........................................................................................................ 9
1.1. T HE MODEM ........................................................................................................ 9
1.2. T HE MODEM - FAX .................................................................................................. 9
1.3. C ALLING MODES DIALING ...................................................................................... 9
1.3.1. Calling Mode................................................................................9
1.3.2. Answering Mode...........................................................................9
1.4. L EASED LINE ..................................................................................................... 10
1.5. P ROTOCOLS ...................................................................................................... 10
1.6. M EMORY ........................................................................................................... 10
2. INSTALLATION ....................................................................................................... 12
2.1. S TAND ALONE VERSION ...................................................................................... 12
2.2. R ACKMOUNT VERSION ....................................................................................... 13
2.3. S WITCH AND J UMPER 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. P OWER - UP SELF - TEST ....................................................................................... 16
3. OPERATION............................................................................................................ 17
3.1. S YNTAX OF AT COMMANDS ................................................................................ 17
3.2. F IRST DIALOGUE ................................................................................................ 17
4. FRONT PANEL OPERATION ................................................................................. 18
4.1. O 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. C 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. F ACTORY CONFIGURATION ................................................................................. 25
5.2. S ELECTING THE MODEM SPEED .......................................................................... 25
5.3. R ATE AND CONNECTION MODE SELECTION .......................................................... 27
5.4. A SYNCHRONOUS OR SYNCHRONOUS MODE :....................................................... 29
5.5. C 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. C
ONFIGURATION OF THE SYNCHRONOUS MODE ................................................... 30
5.7. A UTOMATIC DIALING DIRECTORY ......................................................................... 31
5.8. L EASED LINE ...................................................................................................... 31
5.9. V23 AND B ELL 202 T M ODES ON L EASED L INE .................................................. 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. P RINCIPLES ....................................................................................................... 35
6.2. T HE PHONE DIRECTORY ...................................................................................... 35
6.3. A NSWERBACK SECURITY .................................................................................... 36
6.4. C ALLBACK SECURITY .......................................................................................... 36
6.4.1. Automatic callback.....................................................................36
6.4.2. Dial number request callback. ...................................................37
6.5. I NACTIVITY PASSWORD ....................................................................................... 37
7. SPECIFICATIONS ................................................................................................... 38
7.1. L INE SIDE CHARACTERISTICS .............................................................................. 38
7.2. A UTOMATIC CALL & ANSWER .............................................................................. 38
7.2.1. Originating.................................................................................38
7.2.2. Answering a Call........................................................................39
7.2.3. Connection - Disconnection.......................................................39
7.3. S ERIAL INTERFACE ............................................................................................. 39
7.4. F AX - 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. G 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. D IAL LINE CONNECTOR : RJ11 CONNECTOR ......................................................... 44
9.4. L EASED LINE CONNECTOR : RJ11 CONNECTOR ................................................... 44
9.5. A 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.