CXR MD200 Installation And Operation Manual

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Instruction Manual MD 2000

CXR Telcom Corporation

894 Faulstich Court San Jose, CA 95112 Tel: 408.573.2700 Fax: 408.573.2708 Email: ajmarketing@cxr.com

www.cxr.com

MD 2000

mDSL MODEM

Installation

& Operation Manual

P/N: 8000 601 620

Revision: 0B

MD 2000 - Page 1

Instruction Manual MD 2000

Warning

This publication contains information that is the property of CXR photocopied, reproduced, translated, or reduced to any electronic medium or machine readable form without prior written consent of CXR Anderson Jacobson. Information in this publication is subject to change without notice. CXR Anderson Jacobson assumes no responsibility for errors or omissions in this publication or for the use of this material. All rights reserved. Copyright 2002, CXR Anderson Jacobson.

The 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.

Please read and enforce the safety instructions of the safety and installation chapters.

Anderson Jacobson. No part of this publication may be copied,

The team at CXR Anderson Jacobson thanks you for choosing the MD2000 mDSL modem

We hope that this equipment will provide full satisfaction and in order to serve you even better, we thank you for returning the warranty card you will find at the end of this manual.

We also invite you to read the last part of this manual, which provides useful information on the warranty terms and conditions, which apply to your equipment.

Foreword

This manual describes how to install, operate and troubleshoot the MD 2000.

Chapter 1 Characteristics and typical configurations Chapter 2 How to install and connect the equipment Chapter 3 The front panel displays and switches as well as their use Chapter 4 Examples of typical applications Chapter 5 How to configure the equipment Chapter 6 The V.11 and V.35 DTE interfaces Chapter 7 The 10BT and HUB DTE interfaces Chapter 8 The E1 G.703/G.704 line interface Chapter 9 The T1 G.703/G.704 line interface Chapter 10 The J64 G.703-64 Kbps interface Chapter 11 The V28 - RS232 interface Chapter 12 Test and the error rate statistics provided by the modem Chapter 13 The operation of the internal memory Chapter 14 Lists all the MD 2000 technical characteristics Chapter 15 Will help you to resolve most of the difficulties encountered during the installation and operation of the modem.

MD 2000 - Page 2

Instruction Manual MD 2000

Table of Contents

1 INTRODUCTION........................................................................................................................................................................... 8

1.1 DTE INTERFACES..................................................................................................................................................................... 9

1.2 CONDITIONING ......................................................................................................................................................................... 9

1.3 INSTALLATION AND INITIAL SET-UP...........................................................................................................................................10

1.4 CONFIGURATION .................................................................................................................................................................... 10

1.5 FACTORY CONFIGURATIONS...................................................................................................................................................10

1.6 ALARM RELAYS....................................................................................................................................................................... 11

1.7 G.703/G.704 INTERFACE ....................................................................................................................................................... 11

1.8 APPLICATION EXAMPLES......................................................................................................................................................... 11

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

2.1 DESKTOP MODEM .................................................................................................................................................................. 12

2.1.1 Accessories ...................................................................................................................................................................... 12

2.1.2 Connections...................................................................................................................................................................... 12

2.1.3 Powering........................................................................................................................................................................... 13

2.2 RACK MOUNT MODEM............................................................................................................................................................. 13

2.2.1 Accessories ...................................................................................................................................................................... 13

2.2.2 Installation......................................................................................................................................................................... 13

2.2.3 Connections...................................................................................................................................................................... 13

2.2.4 Powering........................................................................................................................................................................... 14

2.3 AUTOMATIC SELF-TEST..........................................................................................................................................................14

3 DISPLAY AND SWITCHES........................................................................................................................................................ 15

3.1 FRONT PANEL WITH LED’S ..................................................................................................................................................... 15

3.1.1 LED Display...................................................................................................................................................................... 15

3.1.2 The push button................................................................................................................................................................ 16

4 TYPICAL APPLICATIONS ......................................................................................................................................................... 17

4.1 INITIALIZATION........................................................................................................................................................................ 17

4.2 E1 / T1 G.704 LINK ...............................................................................................................................................................17

4.3 LAN TO LAN CONNECTION ..................................................................................................................................................... 18

4.4 X.21-V.35 TERMINAL CONNECTION ......................................................................................................................................... 18

4.5 G.704 TO J64 (G.703 - 64 KBPS) CONNECTION....................................................................................................................... 19

5 OPERATION AND CONFIGURATION....................................................................................................................................... 20

5.1 FACTORY AND USER CONFIGURATIONS................................................................................................................................... 20

5.2 VT100 INTERACTIVE MENUS .................................................................................................................................................. 20

5.3 AT COMMAND MODE.............................................................................................................................................................. 23

5.4 GENERAL PARAMETERS AND COMMANDS................................................................................................................................24

5.4.1 Connection Configuration................................................................................................................................................. 24

5.4.2 Configuration and Control................................................................................................................................................. 26

5.4.3 Security............................................................................................................................................................................. 27

5.4.4 Tests................................................................................................................................................................................. 28

Table of Contents (continued)

6 X.21 - V.11 AND V.35 INTERFACES ........................................................................................................................................30

6.1 GENERAL............................................................................................................................................................................... 30

6.2 INTERFACE CONFIGURATION................................................................................................................................................... 30

6.2.1 X.21 - V.11 Interface Configuration .................................................................................................................................. 31

6.2.2 V.35 Interface Configuration............................................................................................................................................. 31

6.3 WIRING.................................................................................................................................................................................. 32

7 10BT AND 8 PORT HUB BRIDGE INTERFACE....................................................................................................................... 33

7.1 GENERAL............................................................................................................................................................................... 33

7.2 INTERFACE CONFIGURATION................................................................................................................................................... 34

7.3 WIRING OF THE RJ-45 CONNECTOR........................................................................................................................................ 34

7.3.1 RJ-45 on the 10BT Bridge................................................................................................................................................ 34

7.3.2 RJ-45 on the HUB 8 port Bridge....................................................................................................................................... 35

8 E1 G.703-G.704 INTERFACE CONFIGURATION ..................................................................................................................... 36

8.1 GENERAL............................................................................................................................................................................... 36

8.2 E1 INTERFACE CONFIGURATION.............................................................................................................................................. 38

8.3 RJ-45 CONNECTOR WIRING ................................................................................................................................................... 39

9 T1 G.703-G.704 INTERFACE CONFIGURATION...................................................................................................................... 40

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Instruction Manual MD 2000

9.1 GENERAL............................................................................................................................................................................... 40

9.2 T1 INTERFACE CONFIGURATION.............................................................................................................................................. 42

9.3 RJ-45 CONNECTOR WIRING ................................................................................................................................................... 43

10 64 KBPS G.703 / J64 INTERFACE CONFIGURATION............................................................................................................. 44

10.1 GENERAL............................................................................................................................................................................... 44

10.2 J64 INTERFACE CONFIGURATION ............................................................................................................................................ 44

10.3 RJ-45 CONNECTOR WIRING ................................................................................................................................................... 44

11 V28 - RS232 INTERFACE CONFIGURATION........................................................................................................................... 45

11.1 GENERAL............................................................................................................................................................................... 45

11.2 ASYNCHRONOUS MODE .......................................................................................................................................................... 45

11.3 INTERFACE CONFIGURATION................................................................................................................................................... 46

11.4 WIRING.................................................................................................................................................................................. 47

12 DIAGNOSTICS AND TESTS...................................................................................................................................................... 48

12.1 DIAGNOSTICS......................................................................................................................................................................... 48

12.1.1 Connection Status......................................................................................................................................................... 48

12.1.2 Connection Duration ..................................................................................................................................................... 48

12.1.3 Statistics........................................................................................................................................................................ 49

12.2 TEST...................................................................................................................................................................................... 49

12.2.1 Local Analog Loop ........................................................................................................................................................ 49

12.2.2 Remote Digital Loop...................................................................................................................................................... 49

13 MEMORIES................................................................................................................................................................................. 50

14 TECHNICAL CHARACTERISTICS ............................................................................................................................................ 51

14.1 TRANSMISSION MODES........................................................................................................................................................... 51

14.2 GENERAL CHARACTERISTICS .........................................................................................................52

15 TROUBLESHOOTING................................................................................................................................................................ 53

15.1 POWER-UP PHASE ................................................................................................................................................................. 53

15.2 HANDSHAKE AND TRAINING..................................................................................................................................................... 54

15.3 LINE EVALUATION................................................................................................................................................................... 55

15.3.1 Loop resistance............................................................................................................................................................. 55

15.3.2 Loss at 400 KHz............................................................................................................................................................ 55

15.3.3 Frequency Response Vs Rate...................................................................................................................................... 55

15.3.4 Resume......................................................................................................................................................................... 55

16 APPENDIX.................................................................................................................................................................................. 56

16.1 APPENDIX A – WIRING............................................................................................................................................................ 56

16.1.1 Serial Control Port - RJ-45............................................................................................................................................ 56

16.1.2 RJ11 - Line Jack ........................................................................................................................................................... 56

16.1.3 Jack – Alarm Relay....................................................................................................................................................... 57

16.2 APPENDIX B : PRODUCT LINE WARRANTY.............................................................................................................................. 58

MD 2000 - Page 4

Instruction Manual MD 2000

Convention, product range and options

The CXR-AJ mDSL modems consist of a series of configurations or the MD 2000. Although t hey are very similar they differ in the following characteristics:

Characteristics MD 2000 Maximal rate 4.64 Mbps Automatic mode Yes

The equipment is supplied under different versions according to:

•

The type of Terminal interface: V.35 10Base-T, HUB, G.703/G.704 (T1 and E1), V.11/X.21.

•

The type of power supply: 110/230 V AC internal or external, 48 V DC internal

•

The type of front panel: LED display

•

The type of housing: Desktop or rack-mount

These different versions are summarized in the following table. The same designations will be used throughout this manual to identify the differences between versions when applicable.

Desktop Rack mountable card

ersions

Characteristics V28-V24 - RS232 interface

V.11-X.21 interface V.35 interface 10BT filtering bridge Bridge + HUB 8 port interface E1 G.703-G.704 interface T1 G.704 interface 64K-J64 interface LED front panel Px Internal 110 / 230 VAC xI External 110 - 230 VAC xV Internal 48 VDC xC RACK MOUNT FOR AMS 4 / 16 xR

2011 2035 20BT 20HUB 2703 20T1 2064 1064 1028 1011 1035

z z

Example: The MD 2035 PIU is the model number for a desktop version equipped with a V.35 interf ace, a LED display and an internal

110VAC power supply.

The letter “X” used at the end of the model number designates the country version (example: U for USA). Although all versions have the same characteristics, differences exist in the type power supply or power cord used as well as the language in which the manual is written. For more information on country specific versions, please contact your sales representative.

V.35 and X.21-V.11 cables are available as an option:

• V.35: CXR reference CA.601.460

• X.21-V.11 (DB15): CXR reference CA.601.461

Important Information

This equipment complies with the requirement in part 15 of FCC rules for a class B computing device. Only accessories provided with the unit and shielded terminal cables should be connected to the equipment.

MD 2000 - Page 5

Instruction Manual MD 2000

Safety Instructions

This equipment meets the safety requirements of the UL 1950 standard. The following accesses are referenced as safety low voltages:

• 5 VDC Input of the MD2000 / xV desktop unit

• 48 VDC Input of the MD2000 / xC desktop unit

• Line: xDSL leased line connection

• Control : V.24 - RS232 configuration port

• DTE – V.11: V.11-X.21 interface of the MD 2011 and MD 1011 modems

• DTE – V.35: V.35 interface of the MD 2035 modems

• DTE - 10BT: Ethernet interface on the MD 20BT modem

• DTE - HUB: 8 port HUB Ethernet interfaces on the MD 2000HUB modem

• DTE – E1 : 2.048 Mbps G.703 interface of the MD2703 modem

• DTE – T1 : 1.544 Mbps G.703 interface of the MD20T1 modem

• DTE - J64 : 64 Kbps G.703 interface of the MD 2064 modems

• Alarm relay

Desktop MD 2000: The power switch located at the rear of the equipment is the 5VDC-switching element. To totally disconnect the equipment from the

supply source we recommend you disconnect the power cord from the wall outlet. This plug must be installed close to the equipment and provide 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 unit - only CXR maintenance qualified person are allowed to open the enclosure.

Rack mountable card MD 2000 XRF: 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

voltage source is achieved through the cable equipped with a male-grounded plug. Remove the card from the chassis when maintenance or servicing is required.

For safety reasons, only any component access of the equipment, and particularly opening the des ktop 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, …

Environment

The MD 2000 is designed for commercial or light industrial use within the following environmental conditions:

• Storage Temperature 0 to 70 °C

• Operating Temperature: 0 to 45 °C

• Humidity: 0 to 90% without condensation

• Class: IP40

• Flammability: UL94-V0

• 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.

Use

The MD2000 modem is designed to be used in a point-to-point mode when connected to a 2 wire dedicated metallic line. Two modems MD2000 are required to establish a link. No guarantee is given as to compatibility with equipment from different suppliers.

• Modulation : CAP – Carrierless Amplitude and Phase modulation

• Line rate : 144 Kbps, 272 Kbps, 400 Kbps, 528 Kbps, 784 Kbps, 1.040 Mbps, 1.552 Mbps, 2.064 Mbps, 2.320 Mbps, 4.640 Mbps

• Useful spectrum : from 110 to 600 kHz

• Framed mode Nx64 : from 64 Kbps to 2.048 Mbps

• Clear channel mode: 2.320 and 4.640 Mbps

• Ethernet bridge and 8 port HUB:

• E1 G.703-G.704 interface :

¾ Ethernet 802.3 ¾ Frame buffer memory : 256 ¾ Mac address memory : 10.000

¾ rate : 2.048 Mbps ¾ coding : HDB3 ¾ framing : 32 time slots – G.704 compatible

MD 2000 - Page 6

Instruction Manual MD 2000

¾ receiver sensitivity : -40 dB

• T1 interface :

¾ rate : 1.544 Mbps ¾ coding : B8ZS or AMI ¾ framing : 24 time slots with F bit – G.704 compatible ¾ line build outs : DSX-1 and CSU ¾ receiver sensitivity : -36 dB

1 Introduction

The MD 2000 is an mDSL modem (Multi-Rate Digital Subscriber Line) which provides multi rate symmetrical data transmission over a 2 wire dedicated metallic line at speeds up to 2.048Mbps, in increment of 64 Kbps in framed mode or 2.32 or even 4.64 Mbps in clear channel mode. One of the main advantages of mDSL modems compared to earlier technology is the fact that the line transmission speed can be adapted either manually or automatically to the line conditions and line length, to provide optimum performance. The CAP modulation also provides optimum transmission performances such as:

 Narrow spectrum limits cross-talk with adjacent pairs - 500 kHz at 2.32 Mbps  High rate up-to 4.64 Mbps  On-line multi rate to meet the best rate according to the line characteristics  Transmission conforms to ETSI ETS 1001 135 and ITU-T G.991.1 standards  Transmission with echo canceller for better performance when noise or cross-talk on line  Super-frame up-to 2.048Mbps optimizes the synchronization and allows error rate statistics and Nx64 Kbps rate adaptation

1.1 DTE Interfaces

The MD 2000 can be equipped with different types of interfaces:

V.11 and

V.35

interface

V28 -

RS232

E1 G.703-

G.704

interface

T1 G.704

interface

J64 64

Kbps-

G.703

interface

10BT and

HUB

interface

for synchronous data transmission at speeds up-to 4.64Mbps. Clocks can be configured either as internal, external or receive recovery modes. Most output signals may be forced or activated when the connection is established.

this interface carries synchronous links at 64Kbps or 128Kbps, or asynchronous data at 300 to 115,200 bps by

synchronous over sampling. for E1 transmission. The link can be established at a rate of 2.048 Mbps for the transmission of full 32 timeslot E1

signal, or at a lower rate in increments of 64 Kbps for fractional E1 mode, the G..704 interface at 2.048 Mbps being reconfigured at the end of the link.

for T1 transmission. The link can be established at a rate of 1.544 Mbps for the transmission of full 24 timeslot T1

signal, or at a lower rate in increments of 64 Kbps for fractional T1 mode, the G.704 interface at 1.544 Mbps being reconfigured at the end of the link.

for a single 64 Kbps channel transmission. The remote modem can be either an E1 / G.703-G.704 or a V.35 - X.21 model set up for 64 Kbps mode.

the built-in Ethernet bridge filters the frames in accordance with their destination MAC address. Only frames with nonlocal MAC addresses are transmitted to the remote modem. The bridge can memorize up to 10.000 local addresses and process 15.000 frames per second. The HUB version provides 8 Ethernet ports and thus avoids the addition of an external mini-hub for the end termination.

1.2 Conditioning

The MD 2000 can meet all integration requirements either as a desktop or rack-mount unit with different power-supply configurations:

External

adapter Internal

power

supply

Internal 48

converter

Rack-

mountable

card

provides a regulated 5 V

the modem includes a 110/230 V supplied power cord.

the modem includes a 48 V telecom centers.

the 5 V

DC required by the modem is supplied by the rack in which the card is inserted. The AMS 4 and AMS 16

chassis can be powered from 110/230 V for full redundancy.

DC from the mains 110/230 VAC.

AC - 5 VDC power converter which connects directly to the power outlet via the

DC power converter, which can be connected to a 48VDC supply commonly available in

AC or 48 VDC depending on the type of power module installed with provision

MD 2000 - Page 7

Instruction Manual MD 2000

1.3 Installation and initial set-up

The MD 2000 is easy to install. One modem must be configured as NTU (Network Termination Unit) at one end of the line, and the other end as LTU (Line Termination Unit). The clock signals can be independently configured.

The MD 2000 offers an automatic connection mode, which probes the line to connect at the best possible rate. This automatic mode can be disabled in order to force a pre-determined rate; in a Telecommunication provider/Subscriber environment, the rate may be set at the central site and the subscriber modem will automatically adjust itself to the same rate without user intervention. This automatic mode is activated by the following configuration

¾ The LTU Network modem – disable lower rate fall back : %H0 parameter ¾ NTU Line modem – automatic setting : @U0 parameter

1.4 Configuration

The MD 2000 is configured via the serial control port located on the rear of the equipment (RJ-45). In VT100 emulation mode, the configuration is menu driven with on-line help facilities. Only a few keyboard strokes will be required to

set and save the modem parameters. These menus also initiate analog and digital test loops and display a status report as well as bit error rate statistics.

Alternatively the modem can be configured using an AT command set which provides access to all modem parameters. The MD 2000 PR card can also be configured by the CFIP controller card of the AMS16 chassis though its local VT100 mode or TC P-IP

Telnet and SNMP management protocols.

1.5 Factory Configurations

The MD 2000 includes two factory configurations: one NTU mode and one LTU mode, which allow for faster and easier installation since you do not have to configure the modem via the control port. The NTU or LTU configuration is easily selected by pressing the front panel push button during the power- up sequence on the LED front panel version. See chapter 3.

1.6 Alarm relays

The MD2000 is equipped with an alarm relay whose contacts are available on the rear of the equipment via the stereo jack. This relay is activated in the following conditions:

¾ In case of power loss ¾ In case of error during the power up self test ¾ In case of a carrier loss during a time period longer than a preset threshold ¾ By an AT command.

1.7 G.703/G.704 Interface

The E1 -T1 / G.704 interface operates at a constant rate of 2.048 Mbps (E1) or

1.544 Mbps (T1) with 32 or 24 timeslots (framed mode). However, if this rate can not be reached under some line conditions, then only a number (N) of timeslots can be transmitted in Nx64 mode (fractional E1 / T1 mode) with the remaining time slots being discarded.

The first timeslot (TS0) of the E1 interface can be either transmitted transparently or controlled locally by setting TS1 as the start timeslot. The MD2703 can manage the CRC4 in this mode.

The MD20T1 can manage the CRC6.

1.8 Application Examples

The MD2000 can be used for a wide variety of applications such as:

 Local Area Network interconnection – LAN to LAN with filtering bridge  High rate data transmission at 4.64 Mbps in clear channel mode  G.703-G.704 PABX interconnection  E1-G.704-PRI mode subscriber to network connection  T1 / DSX-1 interconnection  Videoconferencing

MD 2000 - Page 8

Instruction Manual MD 2000

2 Installation

2.1 Desktop Modem

2.1.1 Accessories

• One RJ-45-RJ 45 cable and one RJ-45-DB9 converter for the control port

• One RJ11cable for line connection

• External power supply module when applicable (MD2000 XVF version)

• One DB25-DB15 cable if modem is equipped with an X.21-V.11 interface (MD2011 version). This cable is optional and should be

ordered separately (P/N: CA 601 461)

• One DB25-V.35 cable if the modem is equipped with a V.35 interface (MD2035 version) This cable is optional and must be ordered

separately (P/N:CA 601 460)

• One RJ-45-RJ-45 cable for G.703-G.704 interface – (MD2703 and MD20T1 versions)

• This user Manual

2.1.2 Connections

• Connect the modem as per the following drawing. View is from the rear.

• The DTE terminal connector depends on the type of interface:

• A DB25 socket for V28-RS232, X.21-V.11 and V.35 interfaces,

• An RJ-45 socket for 10BT, J64 and E1/T1 G.703 interfaces,

• A multiple RJ-45 socket for the 8 port hub interface.

Back View

LINE CONTROL

TERMINAL

OFF ON

DTE

SELV Leased

line access

SELV

V24

SELV Access*

*SELV = Safety low voltage

110/230Vac

(**) 110/230V

AC / 5VDC Wallmount power supply or 230VAC or 48 VDC cable as applicable

• For safety reasons it is imperative to use the accessories (power adapter and cable) provided with the modem.

2.1.3 Powering

The power adapter is the only switching device and therefore the power outlet should be located close to the equipment and easily accessed.

Once the modem has been connected, switch the ON-OFF switch to the « ON » position

2.2 Rack mount Modem

2.2.1 Accessories

• One RJ-45-RJ 45 cable and one RJ-45-DB25 converter for the control port

• One RJ11cable for line connection

• One DB25-DB15 cable if modem is equipped with a X.21-V.11 interface (MD2011 version). This c able is optional and should be

ordered separately (P/N: CA 601 461)

• One DB25-V.35 cable if the modem is equipped with a V.35 interfac e (MD2035 version) This cable is optional and must be ordered

separately (P/N:CA 601 460)

• One RJ-45-RJ-45 cable for G.703 interface – (MD 2703, MD 20T1, MD 2064 versions)

• This user Manual

MD 2000 - Page 9

Instruction Manual MD 2000

ERMI

2.2.2 Installation

• Please also refer to the chassis user manual for the modem installation.

• Locate an open slot in the chassis and insert the MD 2000 card.

2.2.3 Connections

• Connect the modem at the rear of the chassis as per the following drawing:

• The DTE terminal connector depends on the type of interface:

• A DB25 socket for V28-RS232, X.21-V.11 and V.35 interfaces,

• An RJ-45 socket for 10BT, J64 and E1/T1 G.703 interfaces.

DTE SELV* access

Control V24 port SELV* access

Leased line

*SELV = Safety Low Voltage

SHELF IN

LI E1

SHELF OUT

1 2 3 4 5 6 7 8 9 10 11 12 13

E MODEM CTL

10BT

ADMIN

ALARM

NO C NC SPARE

RUE DE L'ORNETTE 28410 ABONDANT

AMS16-2

NUMERO DE SERIE SERIAL NUMBER DATE DE FABRIC ATIO N YEAR OF MANUFACTURING

FABRIQ UE EN FRANCE / MADE IN FRANCE

48V + CGND SGND

230 V 50 HZ 2 A MAX CLASSE I

ANDERSON JACOBSON

+10%

-15%

SELV* acces

DEVIC ES

15 16

2.2.4 Powering

• The modem car d connects to the chassis power supply when it is fully inserted. The chassis is powered on and off through the r ear

panel power switch.

• Screw the modem front panel to the chassis to avoid any accidental power or connection loss

2.3 Automatic Self-Test

Main components are checked by an internal self test when the modem is powered on:

9 Program memory 9 Data memory 9 Non volatile memory 9 DSP

The “TEST” indicator on the front panel is turned ON during the test sequence

• the “Test” LED indicator is turned OFF if the test was successful.

• it flashes if an error was detected. The error type is displayed by the ATI7 command. See chapter 15 " Troubleshooting.

MD 2000 - Page 10

Instruction Manual MD 2000

3 Display and Switches

3.1 Front Panel

This chapter describes the operation of the 6 LED indicators and 1 push button.

3.1.1 LED Display

Six LED indicators and one pushbutton are installed on the front panel of the Desktop modem. The LEDs display an indication on the status of the modem and provide fault indications during auto test

LED Circuit Function

* / CTRL (Control)

DTR - INTF

(Data Terminal Ready)

CD - 109 (Carrier Detect)

CTS (Clear To Send)

DATA 103 - 104 Flashing when data are transmitted and received by the modem. TEST - 142 142 Shows that the modem is in a test mode

Shows that the equipment is powered (Flashing LED) or the control and configuration terminal is

connected and transmit a DTR-108 signal (LED is ON)

108 Shows that the terminal equipment is connected to the data interface and is ready to transmit and receive

data. See individual interface chapters for explanation. Also indicates a program memory error was detected during power-up self-test.

109 ON when the m odem receives a carrier from the remote modem. Flashing when searching for a carrier

from the remote modem. Also indicates a data memory error was detected during the power-up self test

106 ON when the modem is ready to transmit and the remote modem is synchronized. Flashing during the

negotiation phase with the remote modem, as soon as a signal is detected. Also indicates a non-volatile memory error was detected during the power-up self-test.

Refer to chapter 12 for test features.

3.1.2 The push button

The “MODE” push-button is used to change the modem configuration at power-on and initiates a loop test during normal operation.

Configuration Mode

At power-on, selecting a configuration is made possible by pressing the “MODE” push-button during the self-test sequence. The TEST LED switches off when the automatic self-test is completed. The CTS, DTR and CD LED's indicate the current configuration

number. Until the push-button is released the modem cycles trough the four available configurations according to the following table. A new configuration is presented every two seconds.

DTR CD CTS Configuration ( corresponding AT command)

1 0 1 Factory 0: (AT&F0) - Master mode - LTU 1 1 0 Factory 1: (AT&F1) - Slave mode - NTU 0 0 1 User 0: (AT%M0) – User configuration No 1 0 1 0 User 1: (AT%M1) – User configuration No 2

During the first power-on sequence, or after a complete modem reset, the two factory configurations are also loaded as initial User configurations. The “factory 0” configuration is loaded as the initial default configuration.

Loop Test

When the automatic power up self-test is completed, a loop test can be started by pressing the "MODE" button.

 To start an analog local loop: when the modem is not connected, press the push-button until the “TEST” LED flashes once, then

release the push-button.

 To start a remote digital loop: when the modem is connected, press the push-button until the “ TEST” LED flashes once, then

release the push-button.

* DTR-INTF CD CTS DATA TEST MODE

CTRL 108 109 106 103-104 142

MD 2000 - Page 11

Instruction Manual MD 2000

4 Typical applications

This chapter describes the basic configuration of the MD 2000 in some typical applications. Refer to the following chapters for more specific settings.

4.1 Initialization

These examples describe the AT commands sent to the modem from a factory configuration. Use the following commands to restore the factory configuration :

AT&W255 ATZ

4.2 T1 / E1 G.704 link

This interface extends an E1 / T1 network or interconnects PBX. Models are MD2703 for 2.048Mbps / E1 and MD 20T1 for 1.544Mbps / T1.

Configuration

1. E1 / T1 transparent link, the central office provides the transmit clock (A side) and the PBX is slaved on this clock

¾ NTU / LTU mode ¾ 1.544 (T1) or 2.048 (E1) Mbps

¾ external clock

2. TS0 toTS15 only are transported to increase the reach – Clocking unchanged :

¾ NTU / LTU mode ¾ 1.024 Mbps rate ¾ external clock

3. Idem, but TS1 to TS16 are transported and modem control CRC4 (E1 mode only) :

¾ NTU / LTU mode ¾ 1.024 Mbps rate ¾ external clock ¾ start timeslot = 1 ¾ CRC on

4. One modem is set for internal clock IF both ends expect a clock from the network (typically to interconnect 2 PBX) :

¾ NTU / LTU mode ¾ internal clock on A, external on B

Central G704 A B PABX

rate

G703 MD 20T1 DSL Line MD 20T1 G703

AT Commands to modem

T1 E1

A B A B

%01 @U24 &X1

%01 @U16 &X1

%01 &X0

%00 @U24 &X1

%O0 @U16 &X1

%00 &X1

%01 @U32 &X1

%01 @U16 &X1

%O1 @U16 &X1 @S1 @C1

%01 &X0

%00 @U32 &X1

%O0 @U16 &X1

%O0 @U16 &X1 @S1 @C1

%00 &X1

4.3 LAN to LAN connection

8 stations may be linked to the remote LAN via the MD2000 and its bridge interfaces.

Only two parameters should be set in most cases:

LAN DSL line

MD 20BT MD 2HUB

A B Server PC1 - - - PC8

Parameter Modem A Modem B

NTU / LTU mode %O1 %O0

4.64 Mbps rate @U34 @U34

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Instruction Manual MD 2000

The following parameters may fix troubles if LAN frames are not IEEE 802.3 compliant: *F0 : disables MAC address filtering *P0 : disables Ethernet Padding bit suppression

4.4 V.35-X.21 terminal connection

These interfaces connect terminals, server, routers through their V.35 or X.21 interface.

V35 or X.21 terminal A B V.35 or X.21 terminal

AT commands to modem

Configuration

1. 2.048Mbps link, clocks provided by the modems

¾ NTU / LTU mode ¾ 2.048 Mbps rate ¾ internal clock

2. TX clock provided by the V.35 terminal :

¾ NTU / LTU mode ¾ 2.048 Mbps rate ¾ external / slave clock

4.5 G.704 to J64 (G.703 - 64 Kbps) connection

A B

%01 @U32 &X0

%01 @U32 &X1

%00 @U32 &X0

%00 @U32 &X2

These interfaces connect a 64 Kbps bidirectional G.703 equipment to an E1 - G.703/G.704 network or PBX over one timeslot.

G704 central A B J64 DTE

AT commands to

Configuration

modem

A B

The G.704 central provides the TX clock. The A modem controls the E1 frame synchronization and CRC4. The timeslot 1 carries data to the J64 equipment.

¾ NTU / LTU mode ¾ 2.048 Mbps rate ¾ external clock ¾ Start timeslot: TS1 ¾ CRC4 control

%01 @U1 &X1 @S1 @C1

%00 &X1

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Instruction Manual MD 2000

5 Operation and Configuration

This chapter describes the modem operation through its Control port. All parameters are also accessible via the front panel display and the associated keys.

The modem must be connected to a VT100 compatible terminal or to a PC running a VT100 terminal emulation software that should be configured as follows:

 Speed: 19200 bps  Data format: 8 bits  Parity: none  Stop bit: 1  Emulation: VT100  Flow control: none

The MD2000 configuration can be made either in AT command mode or VT100 Interactive menu mode. The choice of mode is automatic: the AT command mode is activated when an “AT” or ”at” character string is received from the control port. The VT100 menu mode is started when the modem detects three consecutive carriage returns or “ENTER” characters.

The use of the VT100 mode offers valuable advantages such as simplicity and on-line help. The use of the AT commands allows writing configuration script programs. The scripts can be saved to a PC file and can also be

protected with a password. In either mode, all of the modem configuration parameters can be modified and saved to memory.

5.1 Factory and User Configurations

The modem has 4 different configurations: two read-only factory configurations and two user definable configurations, which can be modified and saved by the user.

The configuration process consists of setting up the modem parameters for the application and then saving these parameters in the user memory location, which is activated even after a power shut-off.

Chapter 13 describes the various memories used by the modem.

5.2 VT100 Interactive Menus

The modem sends the VT100 menu pages when it detects three consecutive <CR> or 'ENTER' characters. The possible choices are listed on the bottom line of the screen:

 1 to 9 are valid options on the menu to start a sub-menu or to change a parameter value  P or p: to return to the Previous menu  Q or q or <Esc>: to Quit the VT100 menus and return to the AT command mode

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Instruction Manual MD 2000

First menu:

The first menu provides access to the configuration parameters, internal memory management, loop test, status and statistics displays sub-menus. Press 'Q' or 'Esc' to exit the VT100 menus.

MD 2HUB REV 1.02

1 - EDIT MODEM CONFIGURATION 2 - SAVE AND RESTORE CONFIGURATION FROM MEMORY 3 - LOOP TEST 4 - CONNECTION STATUS

CHOICE : 1 .. 4, Q(quit)

CXR - MD 2000 : Management Menu

M enu 1: Edit Modem Configuration

In this configuration menu, simply enter the number of the parameter to modify. The values scroll automatically. A brief explanation is given on the right-hand side of the screen to explain the parameter function. All

parameters are described in chapter 5.4.

LEASE LINE 1 -LEASED LN MODE ANSR-NTU originate (LTU) or answer (NTU)side 2 -LEASE XMIT LVL +12 dBm transmit level attenuation 3 -LOW SPEED HUNT ON originate allows lower speed

FORMAT - DATA RATE 4 - DTE INTF SPEED 2048 K speed at the user DTE interface 5 - ETH ADD FILTER ON Ethernet address filtering 6 - PADDING COMP

Enter the option number to edit : or P : Previous page / or Q: Quit

CXR - MD 2000: MODEM CONFIGURATION

. ON suppress Ethernet padding bits

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Instruction Manual MD 2000

Menu 2: Save and Restore Configuration from Memory

1 - SAVE CONFIGURATION IN USER MEMORY 0 2 - SAVE CONFIGURATION IN USER MEMORY 1

3 - RESTORE USER CONFIGURATION 0 4 - RESTORE USER CONFIGURATION 1 5 - RESTORE FACTORY CONFIGURATION 0 6 - RESTORE FACTORY CONFIGURATION 1

7 - RESET MEMORY TO FACTORY CONFIGURATION

8 - RESTART

CHOICE : 1 .. 8, P(revious), Q(uit)

CXR - MD 2000 : MEMORY MANAGEMENT

The memory management menu allows recalling and saving of configurations. Option 7 resets all memories to the factory configuration. Option 8 resets the modem to the last saved parameters.

Menu 3: Loop Test

1 - LOCAL ANALOG LOOP TEST

CHOICE : 1, P(previous), Q(quit)

CXR - MD 2000 : LOOP TEST

This menu allows loop test activation:

 Analog local loop if modems are not connected,  Remote digital loop if modems are connected.

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Instruction Manual MD 2000

Menu 4: Connection Status

CXR - MD 2000 : CONNECTION STATUS MODEM VERSION : MD 2000 360/361 REV 1.02 DTE INTERFACE : G.703 - G.704

MODEM SPEED : 2064 K DTE SPEED : 2048 K XMIT LEVEL : 0 dBm RECV GAIN : 31 dB MEAN SQ (S/N) : 41 dB EOC CHANNEL : ON

LL DOWN TIME : 25 SECONDS LL GOOD TIME :13526 SECONDS LL RETRAIN : 1

GOOD SECOND : 900 050 2750 10772 ERRORED SECOND : 000 000 0000 4 BAD CRC COUNT : 0 0 0 33

CHOICE : P(revious), Q(quit)

This menu provides information related to the modem software and hardware versions, connection status (speed, levels, signal to noise ratio and synchronization of the inter-modem monitoring channel - EOC), connection timer and re-synch counter, and statistics of the bit error rate.

Chapter 12 describes this diagnostic information.

LAST 15' CUR 15' CUR HR LAST 24 HR

5.3 AT Command Mode

The MD 2000 recognizes the AT commands when not in a VT100 menu.

AT command Syntax

An AT command starts with an ”AT” or “at” character string and ends with a carrier return (or “ENT ER»). Between are the parameters and their value.

As an example: 'AT%O0<CR>'

¾ AT is the command identifier ¾ %O Is the master or slave selection command ¾ 0 is the value for the Slave mode ¾ <CR> ends the command; the modem activates the command as soon as this suffix is received.

Commands can be entered individually or grouped on a single line as in the following example which sets the Master/Slave mode and the transmission level:

AT%O0%XL4<CR>

Status page

The modem displays pages of status and configuration when the "AT&Sn<CR>" command is entered. Hereafter are two samples of status pages.

Response to an 'AT&S1<CR>' command

USER CONFIGURATION 0 PAGE 1 FORMAT / DATA RATE / MODE LEASE LINE

------------------------------------------------------------ DTE INTF SPEED 2048 K @U32 LEASED LN MODE ORIG/LTU %O1 ETH ADD FILTER ON *F1 LEASE XMIT LVL +12 dBm %XL0 PADDING COMP. ON *P1 LOW SPEED HUNT ON %H1

Response to an 'AT&S6<CR>' command

USER CONFIGURATION 0 PAGE 6 LEASE LINE STATISTICS

------------------------------------- LEASE LINE ACTIVE 72493 SECONDS CONNECTION DOWN 8613 SECONDS TOTAL 81106 SECONDS LEASE LINE RETRAINS 0 OK

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Instruction Manual MD 2000

5.4 General Parameters and Commands

The following tables describe the MD2000 general commands and parameters. The commands, which are related to a specific DTE interface, are described in the following chapters.

5.4.1 Connection Configuration

These commands define the parameters for the connection with the remote modem.

%O Command "Leased Line Mode"

This parameter defines which end of the transmission line the modem is being installed, one being the Line Termination Unit ( i.e. the network or central exchange side), the other being the Network Termination Unit (i.e. the remote or subscriber side).

Format: AT%On

%O0 Subscriber / NTU modem (default in factory configuration 1)

%O1 Network / LTU modem (default in factory configuration 0)

@U Command "DTE Interface speed"

This parameter defines the data rate at the DTE interface. The @U0 command should be set on both modems to start the automatic connection mode of the MD2000 version. Connection will be established through a few consecutive trials to probe the line for best performance.

A given line speed will support several interface speeds. These line speeds are shown in brackets on the following list. Format:

AT@Un

DTE speed LINE speed

@U0.......... auto mode.............................. highest reliable

@U1.......... rate...... 64 Kbps..................... (144 Kbps)

@U2.......... rate...... 128 Kbps................... (144 Kbps)

@U3.......... rate...... 192 Kbps................... (272 Kbps)

@U4.......... rate...... 256 Kbps................... (272 Kbps)

@U5.......... rate...... 320 Kbps................... (400 Kbps)

@U6.......... rate...... 384 Kbps................... (400 Kbps)

@U7.......... rate...... 448 Kbps................... (528 Kbps)

@U8.......... rate...... 512 Kbps................... (528 Kbps)

@U9.......... rate...... 576 Kbps................... (784 Kbps)

@U10........ rate...... 640 Kbps................... (784 Kbps)

@U11........ rate...... 704 Kbps................... (784 Kbps)

@U12........ rate...... 768 Kbps................... (784 Kbps)

@U13........ rate...... 832 Kbps................... (1040 Kbps)

@U14........ rate...... 896 Kbps................... (1040 Kbps)

@U15........ rate...... 960 Kbps................... (1040 Kbps)

@U16........ rate...... 1024 Kbps................. (1040 Kbps)

@U17........ rate...... 1088 Kbps................. (1552 Kbps)

@U18........ rate...... 1152 Kbps................. (1552 Kbps)

@U19........ rate...... 1216 Kbps................. (1552 Kbps)

@U20........ rate...... 1280 Kbps................. (1552 Kbps)

@U21........ rate...... 1344 Kbps................. (1552 Kbps)

@U22........ rate...... 1408 Kbps................. (1552 Kbps)

@U23........ rate...... 1472 Kbps................. (1552 Kbps)

@U24........ rate...... 1536 Kbps................. (1552 Kbps)

@U25........ rate...... 1600 Kbps................. (2064 Kbps)

@U26........ rate...... 1664 Kbps................. (2064 Kbps)

@U27........ rate...... 1728 Kbps................. (2064 Kbps)

@U28........ rate...... 1792 Kbps................. (2064 Kbps)

@U29........ rate...... 1856 Kbps................. (2064 Kbps)

@U30........ rate...... 1920 Kbps................. (2064 Kbps)

@U31........ rate...... 1984 Kbps................. (2064 Kbps)

@U32........ rate...... 2048 Kbps................. (2064 Kbps)

@U33........ rate...... 2320 Kbps................. (2320 Kbps)

@U34........ rate...... 4640 Kbps................. (4640 Kbps)

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Instruction Manual MD 2000

%XL Command "Transmit Level"

This parameter defines the carrier transmit level in dBm. The higher level will be used in most cases. In sensitive cases the level will be attenuated to minimize noise and cross talk in multi-pair cables. Each step represents a 3dBm attenuation of the transmit level.

Format: AT%XLn

%XL0 +12 dBm (Default value) %XL1 +9 dBm %XL2 +6 dBm %XL3 +3 dBm %XL4 0 dBm %XL5 -3 dBm

%H Command "Low Speed Hunt"

This parameter applies to the network (LTU) modem only. This modem is allowed to connect at a line rate lower than specified in its configuration.

Format: AT%Hn

%H0 low speed hunt disabled (Default value) %H1 low speed hunt enabled

5.4.2 Configuration and Control

These commands are used to control the modem AT command mode:

E Command "Command echo”

This command will determine whether the modem will echo commands back to the local DTE. Format: ATEn

E0 Echo disabled

E1 Echo enabled (Default value)

Q Command "Quiet mode"

This command determines if result codes are sent to the screen by the modem when commands are executed. Wh en the modem is connected to a terminal it is frequently necessary to use n = 1.

Format: ATQn

Q0 The modem sends answers (Default value) Q1 The modem does not send answer (Quiet)

I Command "Identification"

The modem returns its identification or the results of its power-up self-test. Format: ATIn

I1 Binary identification of the internal software version I3 Equipment and software version identification I7 results of the automatic self test

&F Command "Restore Factory Configuration"

Reload a factory configuration in the modem memory. Format: AT&Fn

&F0 reload factory configuration 0 &F1 reload factory configuration 1

%M Command "Restore User Configuration"

Reload a user configuration previously saved with the &W command. Format: AT%Mn

%M0 Reload user configuration 0 %M1 Reload user configuration 1

&W Command "Store User Configuration"

Saves a user configuration in the non-volatile memory. The last saved configuration will be activated at the next modem power-on or reinitialization.

Format: AT&Wn

&W0 saves user configuration 0 &W1 saves user configuration 1

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Instruction Manual MD 2000

*RS Command "Reset Statistics"

This command resets all the connection statistics and counters (connection time, bit error rate) Format: AT*RS

+R Command "Alarm Relay Control"

This command controls the status of the alarm relay. Format: AT+Rn

The alarm relay is activated when the carrier is lost after a delay (in seconds) specified by the register S92. If later on the carrier is reestablished, the relay is reset to the OFF position if S92 has an odd value. Action from the operator is required to reset the relay (AT+R0 or ATZ or ON/OFF) if S92 has an even value. This feature is disabled if S92 is set to 0.

+R0 resets to OFF position

+R1 sets to ON position

Z Command "Modem Reset"

This command re-initializes the modem. The connection in progress is aborted, the memory, statistics and counters are cleared, the active user configuration is reloaded and the connection is restarted.

F ormat: ATZ

&S Command "Status Displ ay"

These commands display the modem configuration, connection status and statistics. Format: AT&Sn

&S0 Successively displays all status pages

&S1 Displays page 1 – connection and interface configurations

&S2 Displays page 2 – configuration of the control port

&S3 Displays page 3 – security options

&S4 Displays page 4 – loop test commands

&S5 Displays page 5 – connection status

&S6 Displays page 6 – connection statistics

5.4.3 Security

These commands protect the modem configuration through password control.

%PS Command "Supervisor Password"

This command registers or changes the Supervisor password. The maximum length of the password is 12 characters. The character string is entered twice divided by a semi-colon (

Format: AT%PS:xxxxx:xxxxx

xxxxx password of up to 12 characters.

%PO Command "Operator Passw ord"

This command registers or changes the Operator password. The maximum length of the password is 12 characters. The character string is entered twice divided by a semi-colon (

Format: AT%PO:xxxxx:xxxxx

xxxxx password of up to 12 characters.

%SC Command "Command Protection"

This command protects all AT commands by a password verification. Both Supervisor and Operator passwords are acknowledged. This security operates only if both passwords are defined.

Format: AT%SCn

%SC0 no command protection (by default) %SC1 commands are password protected

%SW Command "User Memory Protection"

This command sets a protection against unauthorized user memory changes through the supervisor password. Format: AT%SWn

%SW0 no user memory protection (by default) %SW1 user memory protected by Supervisor password

:) for a validity check at initiation.

%SS Command "Controller Card Protection"

This command sets a protection for all configuration commands received from the controller card of the AMS16 chassis (not applicable for the Desktop modem).

Format: AT%SSn

%SS0 no protection (by default) %SS1 controller card commands are password protected

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Instruction Manual MD 2000

%SL Command "Lower / Upper Case Control"

This command sets the lower case/capital letters recognition for the passwords registering and controls. Format: AT%SLn

%SL0 Case sensitivity disabled (default) %SL1 Lower case/capital letter differentiation enabled

5.4.4 Tests

These commands generate the loop tests.

&T Command "Loop Test"

This command activates or interrupts loop back tests. Format: AT&Tn

&T0 This command interrupts a loop test in progress. &T1 This command generates a V54-B3 local analog loop. Data received from the terminal equipment are modulated but

the carrier generated in the transmit path of the modem is looped back to the re ceive path of the modem and the terminal equipment. The loop test is halted by the AT&T0 command.

&T3 This command initiates a local digital loop. Data received from the line are sent back to the line. This loop is halted

by the AT&T0 command.

&T6 This command initiates a V54-B2 remote digital loop. The modem sends a loop request to the remote modem so

that it sends back data to the line. The local modem responds ‘ERROR’ if the request fails. This test is not provided at the 2320 and 4640 Kbps rates. This loop is halted by the AT&T0 command. Modems perform a retrain sequence to resynchronize into data mode.

@R Command "Respond to RDL Request"

This command enables or disables the modem from responding to RDL request sent by the remote modem - refer to AT&T6 comman d. In a central office to subscriber application, remote digital loop may be initiated from the CO only with this parameter.

Format: AT@Rn

@R0 RDL requests are rejected @R1 RLD request are enabled and processed (default value)

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Instruction Manual MD 2000

6 V.35 and X.21 - V.11 Interfaces

This chapter describes the operation of MD2011 and MD 1011 with X.21-V.11 interface and MD2035 and MD 1035 with V.35 interface.

6.1 General

The V.11 and V.35 interfaces provide interconnection of synchronous data transmission equipment at speed from 64Kbps up to 4,640Kbps.

Clock Configuration

Clock supplied by the modems Internal &X0 Recover Receive

Clock supplied by DTE (Typically LTU/Network side)

The XCK external clock is used for transmit data path. Received data must be synchronized from the received clock (RCK) provided by the modem.

The following signals from the interface are configurable: signal I (indication) for the X.21-V.11 interface and DSR, C D, CTS signals for the V.35 interface.

DTE A Modem A Modem B DTE B

Typical Configuration LTU modem clock NTU modem clock

&X2

External &X1 Recover Receive

&X2

The DTR-INTF LED is ON if the 108-DTR signal from the V.35 interface or the C signal from the V.11-X.21 interface is active; it is OFF in the opposite case.

6.2 Interface Configuration

&X Command "Sync Clock Source"

This parameter defines the source of the transmit clock. Format: AT&Xn

&X0 Internal clock (default value)

&X1 External clock, supplied by the DTE terminal

&X2 Clock is slaved to the remote modem carrier.

6.2.1 X.21 - V.11 Interface Configuration

*I Command "Signal V.11 - I: Indication"

This parameter controls activation of the X.21 Indication signal Format: AT*In

*I0 I signal always active (default value)

*I1 I signal active when the modem is connected

*I2 I signal reflects the local C signal status

6.2.2 V.35 Interface Configuration

*S Command "V.35 DSR / ITU-T 107 circuit"

This parameter controls the activation of the DSR - 107 signal of the V.35 interface Format: AT*Sn

*S0 signal always active (default value)

*S1 signal active when the modem is connected

*D Command "V.35 CD / ITU-T 109 circuit"

This parameter controls the activation of the CD - 109 signal of the V.35 interface

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Instruction Manual MD 2000

Format: AT*Dn

*D0 CD always active

*D1 CD active when the modem is connected (default value)

*T Command "V.35 -CTS / ITU-T 106 circuit"

This parameter controls the activation of the CTS - 106 signal of the V.35 interface. Format: AT*Tn

*T0 signal always active

*T1 signal active when the modem is connected (default value)

*T2 signal reflects the status of the RTS signal

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Instruction Manual MD 2000

6.3 Wiring

A DB25 female connector is used to connect the terminal equipment to the modem via an adaptation cable. The connector is wired as per the following table:

DB25 Pin X.21-V.11 Signal DB15 Pin V.35 Signal V.35 Pin

1 101 – P.GND 1 101 – P.GND A 2 103 A – TXD A 2 103 A – TXD A P 3 104 A – RXD A 4 104 A – RXD A R 4 C A 3 105 – RTS C 5 106 – CTS D 6 107 – DSR E 7 102 – S.GND 8 102 – S.GND B 8 IA 5 109 – CD F

9 RCK B 13 RCK B X 10 IB 12 11 XCK-B 14 XCK-B W 12 114 B – TCK B AA 13 14 103 B – TXD B 9 103 B – TXD B S 15 114 A – TCK A Y 16 104 B – RXD B 11 104 B – RXD B T 17 115 A – RCK A 6 115 A – RCK A V 18 19 C B 10 20 108 – DTR H 21 22 23 24 113 A – XCK A 7 113 A – XCK A U 25

DB25 - X.21 and DB25 - V.35 adaptation cables are available on request as an option for the MD2000 modem :

¾ DB25 to DB15 cable for X.21-V.11 interface. Part number: CA 601 461, ¾ DB25 to V.35 cable for V.35 interface. Part number: CA 601 460.

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Instruction Manual MD 2000

7 10BT and 8 port HUB Bridge Interface

This chapter describes the operation of the Ethernet 10BT and 8 port Hub interfaces of the MD 2000 version.

7.1 General

The Ethernet 10baseT and 8 port Hub interfaces provide LAN-to-LAN connection via a high-speed link up to 4.6 40 Mbps. In a typical application, the 10 BaseT single port will be used at the central site to connect to the LAN and the 8 port HUB will be used at the remote location to connect several workstations without the need for any additional equipment. Both interfaces have been designed as a filtering bridge to optimize the traffic on the high-speed connection between modems.

Principle

The bridge transmits all types of Ethernet frames without exception (including the broadcast frames). In order to absorb the Ethernet traffic peaks, the interface has a 256 frame buffer which are transmitted at the rate provided by the

modem

connection.

The Ethernet filtering consists of only transmitting frames which destination MAC address is not known on the local Ethernet network. In other words the modem does not transmit the frames with a local destination address. This function optimizes the traffic between the modems and increases the throughput seen by the local network.

For filtering purposes, the interface memorizes up to 10,000 local station addresses in its memory. The address of stations that do not transmit nor receive any frame during a 5 minute delay, is automatically suppressed from the memory (address aging principle).

A built-in Ethernet compression algorithm does not transmit the padding bits of the short frames and reconstruct them on the receive site. This function optimizes the traffic between the modems and increases the throughput seen by the local network.

The DTR-INTF LED on the front panel is permanently ON for the hub version and reflects the link integrity of the 10BT bridge version.

Wiring

To facilitate the network wiring:

 The RJ-45 plug on the MD20BT bridge is wired as a station mode and connects to the network as any other station. T he prope r wire

polarity must be checked when wiring the bridge.

 The RJ-45 plug on the HUB of the MD2HUB is wired as a HUB mode to directly connect the stations. The ports on the HUB

automatically detect the polarity of the received signal on the connected stations. The wiring polarity is therefore not important.

Modem Configuration

Only the LTU – NTU mode must be configured for each modem, the rate can be set on automatic mode.

7.2 Interface Configuration

*F Command "Ethernet Address Filtering"

This parameter enables or disables the frame filtering of the Ethernet local addresses. Format: AT*Fn

*F0 no filtering, all frames are transmitted *F1 filtering, only the frames of unknown destination address are transmitted. (Default value)

*P Command "Padding bit Compression"

This parameter enables or disables the discarding of Ethernet padding bits for the transmission between the modems. Padding bits are regenerated at the other side.

Format: AT*Pn

*P0 compression disabled, the frames are integrally transmitted *P1 compression enabled, the padding bits are discarded before transmission and regenerated at the receive end

(default value)

7.3 Wiring of the RJ-45 Connector

An RJ-45 female socket provides a connection for the terminal equipment. The connector is shown on the following drawing:

1….….8

7.3.1 RJ-45 on the 10BT Bridge

The RJ-45 socket of the 10BT bridge is wired as per the following table:

Pin Signal I/O Description

1 Transmit + O+ + Transmit 2 Transmit - O- - Transmit

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Instruction Manual MD 2000

3 Receive + I+ 4 Not connected 5 Not connected 6 Receive - I- - Receive 7 Not connected 8 Not connected

CAUTION: The bridge is polarity sensitive and the received pair must be wired with special care.

+ Receive

7.3.2 RJ-45 on the HUB 8 port Bridge

The RJ-45 sockets of the 8 port HUB are wired as per the following drawing:

Pin Signal I/O Description

1 Receive 1 I1 Receive wire 1 2 Receive 2 I2 Receive wire 2 3 Transmit 1 O1 Transmit wire 1 4 Not connected 5 Not connected 6 Transmit 2 O2 Transmit wire 2 7 Not connected 8 Not connected

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Instruction Manual MD 2000

8 E1 G.703-G.704 Interface Configuration

This chapter describes the operation of the MD2703 E1 G.703-G.704 interface.

8.1 General

MD2703 modems, equipped with G.703-G.704 interfaces, provide a transmission path for PCM, E1 or PRI links over 2 wire metallic lines. The MD2000 could be configured to transmit and receive all or part of the 32 timeslots of an E1 link in order to match the maximum rate permissible on a line or to accommodate longer lines.

Principle

The interface presents a fixed rate of 2.048 Mbps, G.703 clear channel or framed G.704. The interface extracts and presents to the E1 link a number,

of a full E1 is achieved when N=32 which is the transmission of the 32 timeslots. If N is less than 32 then the E1 link is referred to as a fractional E1 or FE1.

If the first timeslot is not transported, the MD2703 provides the local G.704 synchronization with or without CRC4 control. The DTR-INTF LED is ON if the G.703-G.704 interface receives a signal, it sho ws that a G.703 carrier has been detected. It is O FF in

the opposite case.

Modem Configuration

The line rate must be 2.048Mbps maximum. The 2.32 Mbps and 4.64 Mbps line rates are not allowed when using the E1 G.703-G.7 04 interface even if the modem parameters allow them. The automatic mode (@U0) remains possible but the modem will automatically exclude the 2.32 Mbps and 2.64 Mbps rates.

Clock Configurations

The transmit clock source of the G.703 interface can be internal, external from the remote modem or slaved to the re ceive G.703 carrier of the E1 interface.

The MD2000 always synchronizes on the G.703 receive clock for the receive data path. When planning and installing a G.703 link, special care must be given to the combinations of the clocks to be used at both end of the

link.

Internal Clock

The MD2000 uses its internal clock to transmit data on the G.703 interface. All other equipment on the network must synchronize to this clock.

Example:

Local Terminal

Equipment

controlled by

the receive

Clock

External Clock

The clock is supplied by the network. The local MD2000 passes its synchronization to the remote modem, which in turn pass it to the terminal equipment. The same scenario is used on the return path. This configuration is the most typical:

Example:

Central

Network

supplies the

clock signal

Slave clock mode

The MD2000 uses the G.703 received clock signal as the G.703 transmit clock signal.

Example:

Local

Terminal

Equipment

G703

MD 2000

Internal

Clock (&X0)

LTU

MD 2000

2 modems

LTU

MD 2000

in external

mDSL

Link

External

mDSL

Link

(&X1)

mDSL

Link

N, of timeslots from the first TS0 or second TS1 timeslot. The transmission

MD 2000

Clock (&X1)

NTU

MD 2000

clock config.

NTU

MD 2000

Equipment

Remote

Terminal

Equipment

controlled

by the

receive

clock

Subscriber

terminal

Equipment

slaved to the

received

clock

Remote

Terminal

Equipment

MD 2000 - Page 27

Instruction Manual MD 2000

(Network)

supplies

the clock signal

The clocks will be configured as one of the following combinations:

MD 2000 LTU network MD 2000 NTU subscriber Typical Case

External &X1 External &X1 Network extension Internal &X0 External &X1 Simulate a network to

Slave &X2 External &X1 Special Cases

Slave clock

(&X2)

LTU

External

clock (&X1)

NTU

interconnect two terminals

Equipment

slaved to the

received

clock

8.2 E1 Interface Configuration

@U Command "DTE Interface Speed"

This parameter is already described in chapter 5. On the G.703-G.704 it defines the number of transmitted timeslots. Values 33: 2.32 Mbps and 34 : 4.64 Mbps are not allowed.

Format: AT@Un

@U0 automatic mode @U1 1 TS transmitted @U2 2 TS transmitted ……. @U32 32 TS transmitted (default value)

@H Command "Long Haul"

This parameter controls the G.703 receiver sensitivity and then the length of the G.703 link. A low sensitivity will be used for the short distance link in order to maintain a good noise immunity. Format: AT@Hn

@H0 Short haul : 300 m length (default) @H1 Long haul : 1.6 km distance

@S Command "Start Timeslot"

This parameter defines the first timeslot extracted from the G.704 frame, i.e. TS0 or TS1. Format: AT@Sn

@S0 extract from TS0 (default) @S1 extract from TS1

@C Command "CRC 4 Control"

This parameter controls the CRC4 management when the first timeslot TS0 is controlled by the modem (@S1). Format: AT@Sn

@C0 CRC4 disabled (default) @C1 CRC4 active

&X Command "Sync Clock Source"

This parameter defines the source of the G.703 transmit clock Format: AT&Xn

&X0 Internal Clock &X1 External clock extracted from the remote modem (default) &X2 Transmit clock slaved on the received G.703 signal

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Instruction Manual MD 2000

8.3 RJ-45 Connector Wiring

An RJ-45 female connector provides the connection to the terminal equipment. The connector is shown on the following drawing.

1….….8

Pin Signal I/O Description

1 RECV TIP I Received signal 2 RECV RING I Received signal 3 NC 4 XMIT TIP O Transmit signal 5 XMIT RING O Transmit signal 6 NC 7 NC 8 NC

G.703 cables are available on demand as an option to the MD2703 modem:

• RJ-45 - DB15 Network cable : reference CXR CA.601 578 (1.5 m long)

• RJ-45 - DB15 Terminal cable : reference CXR CA.601 579 (1.5 m long)

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Instruction Manual MD 2000

9 T1 G.703-G.704 Interface Configuration

This chapter describes the operation of the MD20T1 T1 G.703-G.704 interface.

9.1 General

MD20T1 modems equipped with T1 G.703-G.704 interfaces provide a transmission path for T1 links over 2 wire metallic lines. The MD2000 could be configured to transmit and receive all or part of the 24 time slots of a T1 link in order to match the maximum rate permissible on a line or to accommodate longer lines.

The MD20T1 provides all features to adapt to any user application of both DS1 and DSX-1 interconnection.

Principle

The interface presents a constant rate of 1.544 Mbps, T1 clear channel or framed G.704. The interface extracts and presents to the T1 link a number,

achieved when N=24 which is the transmission of the 24 timeslots. If N is less than 24 then the T1 link is referred to as a fractional T1 or FT1.

The DTR-INTF LED is ON if the T1 interface receives a signal, it shows that a T1 carrier has been detected. It is OFF in the opposite case.

Modem Configuration

The line rate must be 1.552 Mbps maximum. The higher (2.064 Mbps, 2.32 Mbps and 4.64 Mbps) line rates are not allowed when using the T1 interface even if the modem parameters allow them. The automatic mode (@U0) remains possible but the modem will automatically exclude these rates.

The MD20T1 provides all parameters for deploying a network or interconnecting PBX.

Clock Configurations

The transmit clock source of the T1 interface can be internal, external from the remote modem or slaved to the receive carrier of the T1 interface.

The MD2000 always synchronizes on the T1 receive clock for the receive data path. When planning and installing a T1 link, special care must be given to the combinations of the clocks to be used at both end of the link.

Internal Clock

The MD2000 uses its internal clock to transmit data. All other equipment on the network must synchronize to this clock.

Example:

Local Terminal

Equipment

controlled by

the receive

Clock

External Clock

The clock is supplied by the network. The local MD2000 passes its synchronization to the remote modem, which in turn passes it to the terminal equipment. The same scenario is used on the return path. This configuration is the most typical:

Example:

Central

Network

supplies the

G703

MD 2000

Internal

Clock (&X0)

LTU

MD 2000

2 modems

LTU

in external

mDSL

Link

External

mDSL

Link

clock config.

(&X1)

N, of timeslots from the first time slot. The transmission of a full T1 is

MD 2000

Clock (&X1)

NTU

MD 2000

NTU

Equipment

Remote

Terminal

Equipment

controlled

by the

receive

clock

Subscriber

terminal

Equipment

slaved to the

received

MD 2000 - Page 30

Instruction Manual MD 2000

clock signal clock

Slave clock mode

The MD2000 uses the G.703 received clock signal as the G.703 transmit clock signal.

Example:

Local

Terminal

Equipment

(Network)

supplies

the clock signal

The T1 transmit clocks will be configured as one of the following combinations:

MD 2000 LTU network MD 2000 NTU subscriber Typical Case

External &X1 External &X1 Network extension Internal &X0 External &X1 Simulate a network to

Controlled &X2 External &X1 Special Cases

MD 2000

Slave clock

(&X2)

LTU

mDSL

Link

MD 2000

External

clock (&X1)

NTU

interconnect two terminals

Equipment

Remote

Terminal

Equipment

slaved to the

received

clock

9.2 T1 Interface Configuration

@U Command "DTE Interface Speed"

This parameter is already described in chapter 5. On the T1 interface it defines the number of transmitted timeslots. Values higher than 24 are not allowed.

Format: AT@Un

@H Command "Long Haul"

This parameter controls the T1 receiver sensitivity and then the length of the G.703 link. A low sensitivity will be used for the short distance link in order to maintain a good noise immunity. Format: AT@Hn

@G Command "G.703 Line Code"

This parameter defines the T1 line coding. Format: AT@Gn

@L Command "Line Build out"

This parameter defines the waveform of the transmitted T1 signal. Format: AT@Ln

@U0 automatic mode @U1 1 TS transmitted @U2 2 TS transmitted ……….. @U24 24 TS transmitted (default value)

@H0 DSX-1 short haul (default) @H1 DS1 long haul

@G0 B8ZS coding (default) @G1 AMI coding

@L0 0 to 133 feet – DSX-1 and 0dB CSU @L1 133 to 266 feet DSX-1 @L2 266 to 399 feet DSX-1 @L3 399 to 533 feet DSX-1 @L4 533 to 655 feet DSX-1

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Instruction Manual MD 2000

@L5 -7.5 dB CSU @L6 -15 dB CSU @L7 -22.5 dB CSU

@F Command "D4 / ESF Frame"

This parameter defines the T1 frame mode. Format: AT@Fn

@F0 D4 Super Frame mode (default) @F1 Extended Super Frame ESF mode

&X Command "Clock Signal Origin"

This parameter defines the source of the T1 transmit clock. Format: AT&Xn

&X0 Internal Clock &X1 External clock extracted from the remote modem (default) &X2 Clock signal slaved to the local T1 received signal

9.3 RJ-45 Connector Wiring

An RJ-45 female connector provides the connection to the terminal equipment. The connector is shown on the following drawing.

1….….8

Pin Signal I/O Description

1 RECV TIP I Received signal 2 RECV RING I Received signal 3 NC 4 XMIT TIP O Transmit signal 5 XMIT RING O Transmit signal 6 NC 7 NC 8 NC

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Instruction Manual MD 2000

10 64 Kbps G.703 / J64 Interface Configuration

This chapter describes the operation of the MD2064 and MD 1064 G.703 - 64 Kbps bi-directional J64 interface.

10.1 General

The J64 interface of the MD2064 carries one 64 Kbps channel. The remote modem may be either the same J64 model or an E1 G.703/G.704 interface extracting the first data timeslot of the G.704 frame, or even a X.21-V.11 interface at a rate of 64 Kbps.

The DTR-INTF LED is on if the J64 interface detects a carrier : it reflects the J64 carrier detect. It is off in the opposite case.

Modem Configuration

The J64 transmit clock is typically extracted from the remote interface for this G.703 bi-directional interface. One modem could be set for internal clock if both end terminals expect a clock from a G.703 network.

10.2 J64 Interface Configuration

&X Command "Clock Signal Origin"

This parameter defines the source of the J64 transmit clock. Format: AT&Xn

&X0 Internal Clock &X1 External clock extracted from the remote modem (default) &X2 Clock signal slaved to the local T1 received signal

10.3 RJ-45 Connector Wiring

An RJ-45 female connector provides the connection to the terminal equipment. The connector is shown on the following drawing.

1….….8

Pin Signal I/O Description

1 RECV TIP I Received signal 2 RECV RING I Received signal 3 NC 4 XMIT TIP O Transmit signal 5 XMIT RING O Transmit signal

6 .. 8 NC

11 V28 - RS232 Interface Configuration

This chapter describes the operation of the MD 1028 V24-V28 - RS32 interface.

11.1 General

The V28 - RS232 interface connects data terminal equipment for synchronous data transmission at 64 Kbps or 128 Kbps, or asynchronous data transmission up to 115,200 bps

Clock configuration

Configuration Clock on LTU modem Clock on NTU modem

Clocks are provided by the modems Internal &X0 Slaved &X2 Transmit clock is provided by DTE terminal

(typically on the LTU / central office side) Asynchronous mode Internal &X0 Internal &X0

External &X1 Slaved &X2

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Instruction Manual MD 2000

The external clock is used on the transmit data path. Received data should be synchronized on the received clock issued by the modem.

The DSR, CD and CTS signals provided by the interface are configurable. The DTR-INTF LED is on if the 108-DTR signal is active on the RS232 interface. It is off otherwise.

11.2 Asynchronous mode

Asynchronous data are sampled on the interface by a synchronous clock of a rate at least 8 times higher than the asynchronous rate. The modem connection speed should be set according the following picture. Because of the principle of synchronous sampling, only

on-Xoff flow control can be used. X

Asynchronous rate MDSL rate

0 to 38.4 Kbps 128 Kbps : @U2

57.6 Kbps 256 Kbps : @U4

115.200 Kbps 384 KPBS : @U6

11.3 Interface Configuration

@U Command "DTE Interface Speed"

This parameter is already described in chapter 5. The highest rate of the synchronous clock is 128 Kbps. Format: AT@Un

@U0 automatic mode @U1 64 Kbps synchronous @U2 128 Kbps synchronous or <38.4 Kbps asynchronous @U4 57.6 Kbps asynchronous @U6 115.2 Kbps asynchronous

&X Command "Sync Clock Source"

This parameter defines the source of the transmit clock. Format: AT&Xn

&X0 Internal clock (default value) &X1 External clock, supplied by the DTE terminal &X2 Clock is slaved to the remote modem carrier

*S Command "DSR / ITU-T 107 circuit"

This parameter controls the state of the DSR - 107 signal of the V24-RS232 interface. Format: AT*Sn

*S0 signal always *S1 signal active when the modem is connected

active (default value)

*D Command "CD / ITU-T 109 circuit"

This parameter controls the state of the CD - 109 signal of the V24 - RS232 interface. Format: AT*Dn

*D0 CD always active *D1 CD active when the modem is connected (default value)

*T Command "CTS / ITU-T 106 circuit"

This parameter controls the state of the CTS - 106 signal of the V24 - RS232 interface. Format: AT*Tn

*T0 signal always active *T1 signal active when the modem is connected (default value) *T2 signal reflects the status of the RTS signal

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Instruction Manual MD 2000

11.4 Wiring

A DB25 female connector is used to connect the terminal equipment to the modem. The connector is wired per the following table:

DB25 Pin V24 - RS232 Signal

1 101 – C. GND 2 103 – TXD 3 104 – RXD 4 105 – RTS 5 106 – CTS 6 107 – DSR 7 102 – S. GND 8 109 – CD 9

… 14 15 114 – TCK 16 17 115 – RCK 18 19 20 108 – DTR 21 22 23 24 113 – XCK 25

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Instruction Manual MD 2000

12 Diagnostics and Tests

12.1 Diagnostics

The modem displays its operating parameters and connection statistics for evaluation of the transmission quality and performanc e. This information is given on status pages 5 and 6 or on menu 4 in VT100 mode as shown in the following example:

MODEM VERSION : MD 2000 360/361 REV 1.02 DTE INTERFACE : G.703 - G.704

MODEM SPEED : 2 064 K DTE SPEED : 2 048 K XMIT LEVEL : 0 dBm RECV GAIN : 31 dB MEAN SQ (S/N) : 41 dB EOC CHANNEL : ON

LL DOWN TIME : 25 SECONDS LL GOOD TIME : 13526 SECONDS LL RETRAIN : 1

GOOD SECOND : 900 050 2750 10772 ERRORED SECOND : 000 000 0000 4 BAD CRC COUNT : 0

CHOICE : P(revious), Q(uit)

CXR - MD 2000 : CONNECTION STATUS

LAST 15' CUR 15' CUR HR LAST 24 HR

0 0 33

12.1.1 Connection Status

The modem provides the following parameters concerning the connection in progress for evaluation of the remote modem received signal quality.

MODEM SPEED: modulation speed between the modems. DTE SPEED: binary rate at the interface thus apparent to the user. XMIT LEVEL: transmit level. RECV GAIN: receive signal amplification level. This information provides an

MEAN SQ: Receiver Signal to noise ratio. The higher the value (between 30 and

EOC CHANNEL: The EOC channel is an in band data channel used by the modems to

indication of the on-line attenuation level. Typical values range from 30 to 50dB up to 55dB in extreme conditions.

41dB), the better the quality of the received signal. The bit error rate is not correct below 28dB for the high rates and 19dB for the low rates.

exchange messages for automatic rate connection and remote loop establishments. These features are not supported if this channel is OFF. The EOC channel is not provided at 2.32 Mbps and 4.64 Mbps rates. A configuration issue could be suspected if this channel is 'OFF' at a rate of 64 Kbps to 2.048 Mbps.

12.1.2 Connection Duration

The modem provides the following information concerning the time during which it remained connected or disconnected since the l ast power-up or re-initialization.

This information is used to evaluate the link availability:

 LL DOWN TIME: number of seconds in disconnected mode  LL GOOD TIME: number of seconds in connected mode  LL RETRAIN: number of retrains with the remote modem

12.1.3 Statistics

The modem checks for CRC errors on the received DSL frames, a nd provides error counters for the last and previous 15 minutes, 60 previous minutes and last 24 hours. This information allows monitoring of the transmission quality over a period of time.

 GOOD SECOND: number of seconds without CRC error.  ERRORED SECOND: number of seconds during which at least one CRC error has been detected.  BAD CRC COUNT: CRC error count.

These indications are not provided at the 2.32 Mbps and 4.64 Mbps rate.

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Instruction Manual MD 2000

12.2 Test

12.2.1 Local Analog Loop

The modem synchronizes to the carrier that it transmits on its line interface. This configuration provides a test of all the internal parts in the modem. This loop corresponds to an ITU-T V54 B3 loop.

Procedure:

This loop is activated :

 In menu 3 of the VT100 interface;  By the AT&T1 command when in AT command mode;  By activating the test menu on the LCD display (when applicable);  By pressing the pushbutton on the front panel and releasing it when the TEST LED flashes once (when applicable) when the

modem is not connected.

12.2.2 Remote Digital Loop

The remote modem (B) sends back data received from the line, which lets the terminal equipment (DTE A) test the data link up to the remote terminal point (DTE B). This loop corresponds to an ITU-T V54-B2 loop.

Procedure:

This loop is activated from Modem A when the modems are connected at a rate of 64 Kbps to 2.048 Mbps :

 In menu 3 of the VT100 interface;  By the AT&T6 command;  By activating the test menu on the LCD (when applicable);  By pressing the push button and releasing it after the TEST LED flashes once (non-LCD version – when applicable).

The same loop can be activated at Modem B by the AT&T3 command at any connection rate.

DTE A Modem A Modem B DTE B

DTE A MODEM A

MD 2000 - Page 37

Instruction Manual MD 2000

-RAM

13 System Memory

The modem includes three different system memories:

• The Flash EPROM, which permanently stores the factory configuration and the modem firmware.

• The RAM, where the active configuration reside.

• The NVRAM (non-volatile memory) where the user configurations are saved. The content of this memory is protected even when

the modem is switched off. At the first power-up or after a complete re-initialization, the content of the three memories is the same and is set to the factory default configuration. The

AT&W n command saves the current configuration to the non-volatile memory. All changes made by the user are saved as user

configuration (n=0 or 1). The last configuration saved by an These memory operations are described in the following drawing:

AT&Wn command will be automatically loaded at the next reset or power-up.

PRO

Factor

Saved

Power-up

Memory Re-initialization AT&W255 <CR> Memory save AT&W0 and AT&W1 <CR> Loading of factory configuration w/o loss of the saved

memory Loading of the user configuration AT%M0 and AT%M1 <CR>

AT&F0 and AT&F1 <CR>

MD 2000 - Page 38

Instruction Manual MD 2000

14 Technical Specifications

14.1 Transmission Modes

• Modulation: CAP - Carrier less Amplitude and Phase modulation

• Transmission compliant with ITU-T G.991-1, A NSI TR-28, ETS 101.135

• Line rates: 144 Kbps, 272 Kbps, 400 Kbps, 528 Kbps, 784 Kbps, 1.04 Mbps, 1.552Mbps, 2.064Mbps, 2.320Mbp, 4.64Mbps

• Spectrum depending on rate: from 110 to 600 kHz

• Framed Mode Nx64: from 64 Kbps to 2.048 Mbps

• Transparent Mode: 2.32 Mbp and 4.64 Mbps

• Training time: 11sec at 2.064 Mbps

• Ethernet bridge and 8 ports HUB:

¾ rate : 64 Kbps to 4.64 Mbps ¾ Ethernet 802.3 ¾ Frame buffer memory: 256 ¾ MAC address memory: 10.000 ¾ MAC address filtering: filtering or transparent bridge ¾ Ethernet compression: controlled padding bits suppression/regeneration

• E1 G.703-G.704 Interface:

¾ G.703 rate: 2.048 Mbps +/- 50 ppm ¾ Coding: HDB3 ¾ Framing: 1 to 32 time slots - G.704 ¾ CRC4 ¾ Receiver sensitivity: -40 dB

• T1 G.703-G.704 Interface:

¾ T1 rate: 1.544 Mbps +/- 50 ppm ¾ Coding: B8ZS or AMI ¾ Framing: 1 to 24 time slots plus F bit – G.704 ¾ Receiver: DSX-1 short haul or DS1 long haul ¾ Transmitter: DSX-1 (133, 266, 399, 533, 655 feet) or CSU (0, -7.5, -15, -22.5 dB) Line Build Out

• V.35 / X.21-V.11Interface:

¾ Rates: 64 Kbps up to 4.64 Mbps ¾ DSR, CD, CTS, I signals: forced or connection activated

• V24-V28 / RS232 Interface

¾ synchronous rates :64 Kbps and 128 Kbps ¾ asynchronous rates :up to 115.200 bps through synchronous sampling. ¾ DSR, CD, CTS signals: forced or connection activated

• J64 / 64Kbps - G.703 Interface

¾ rate : 64 Kbps +/- 50 ppm ¾ G.703 codirectional ¾ Transmit clock : internal, slave, external ( from the G.703 terminal )

14.2 General Specifications

Dimensions: L x W x H: 10.25 x 6.70 x 1.4 in (260 x 170 x 35 mm) (Desktop). Weight: rack plug-in card FPRU / FPRF: 1lb (0.4 kg) Desktop : 2.1 lbs (0.8 kg) Power supply: 1.2 lbs (0.45 kg) Maximum power consumption:

 110VAC: 80 mA  5 VDC: 1A ( MD 2HUB 8 port HUB interface connected at 2.048 Mbps )  External power supply for desktop version : 110 / 230 VAC - 50/60Hz 20mA  48Vdc power supply version - SPC: 45mA.

Operating temperature: 32° to 122° F (0°C up to 50°C). Storage temperature: 32° to 158° F (0°C up to 70°C). Humidity : 90% non condensing Compliant to UL 1950 safety standard. Compliant to FCC part 15 – class B EMC standard.

MD 2000 - Page 39

Instruction Manual MD 2000

15 Troubleshooting

This chapter describes the modem operation phases and provides diagnostics for most of the problems encountered during installation and operation of the MD2000.

15.1 Power-up Phase

The following phases can be observed during the modem power-up:

Phase Description

Memory Test

Duration: 1 sec

Local Analog

Loop Test

Duration: 3 sec

Connection

Duration: unlimited

The following troubles can be diagnosed at power-up:

The modem checks its internal memory.

¾ All of the 6 LED on the front panel are OFF ¾ The LCD screen of the display initializes and stays blank

The modem sets a local analog loop test to check its main components. The display is as follows:

¾ TEST LED is ON ¾ CD LED fast flashing ¾ TEST LED is OFF if the test passed. ¾ LCD displays the automatic test results.

The modem starts its normal operation, loads the configuration parameters and attempts to connect with the remote modem. See following chapter.

Trouble Check

Power-up phases do not progress

The TEST LED stays ON after power-up

The modem does not answer the commands

ATI7 command indication

ATI7: Responses

BAD ROM Checksum error in program memory BAD RAM Failed write/read test on data memory BAD NON VOLATILE MEMORY Checksum error in non-volatile memory BAD DSP DSP is not operating ALB FAILED Local analog loop error

¾ The power plug at the rear of the unit and the outlet ¾ ON/OFF switch is on “ON” position ¾ Power is applied to the chassis, electrical continuity on the fuse receptacle ¾ ON or flashing of the CTRL LED on the front display

The automatic test has detected an error

¾ Check the reason for the error in response to the ATI7 command – See following table ¾ Send the following commands:

AT&W255 <CR>

ATZ <CR>

And then start again

 CTRL LED stays ON permanently. This LED stays ON as soon as the modem detects the terminal on the

control port (DTR signal)

 The CTRL plug at the terminal or PC used for the modem configuration.  The terminal parameters:19,200bps, 8 data bits, 1 stop bit, no parity and no Flow Control  At power up and when a terminal is connected to the CTRL port (signal DTR), the modem sends a welcome

message.

15.2 Handshake and Training

The connection is established in 3 successive phases:

Phase Description

Detection

Handshake

The modem searches for the transmitted signal from the remote modem: This is displayed as follows:

¾ CD LED flashes slowly and CTS LED is OFF ¾ CD LED flashes slowly and the second line on the LCD display reads: 'HANDSHAKE':

In this state the modem was unable to detect the signal transmitted by the remote modem.

Ö Check the metallic pair for continuity and wiring on the line RJ11 connector. Ö Check that one modem is Network (LTU) and th e other Line (NTU) configured, two modems in the same m

detect each other.

Ö The modem must be re-initialized with ATZ command or ON-OFF when one parameter is modified. The ne

MD 2000 - Page 40

Instruction Manual MD 2000

Phase Description

inoperative without the re-initialization.

Training

Negotiation

Data

Connection

The modem tries to synchronize with the carrier from the remote modem. This is displayed as follows:

¾ Fast flashing on the CD and CTS LED display ¾ Fast flashing on the CD LED display and the second line on the LCD display reads: TRAINING

In this state the modem has detected the transmit signal from the remote modem,

If the line cannot meet this rate, the negotiation is unsuccessful.

Try a lower rate

Ö Ö Try a connection in automatic mode: AT@U0 Ö Check that the Network (NTU) authorizes the rate fallback function AT%H1command

The modem is connected, data are transmitted. This is displayed as follows:

¾ CD and CTS LED are ON on the front display ¾ CD LED is ON on the LCD display panel

In case of high bit error rate:

Ö Check the modem status pages and statistics, option 4 of the VT100 menus. Ö Check the end-to-end clock compatibility. Refer to the provided clock description in the interface chapter.

it tries to connect at its configur

15.3 Line Evaluation

The characteristics of the line should be evaluated or even qualified when installing xDSL modems. The line must be a direct point to point metallic pair, which excludes any digital, active or coupling interface. The following measurements check for the proper xDSL characteristics of the line:

15.3.1 Loop resistance

• Loop resistance : short the wires at one end of the line and measure the loop resistance at the other end.

• Insulation : open the line at one end and measure the insulation resistance at the other end, between each wire and the ground ,

and between

A suitable line should show :

Ö Loop resistance : lower than 500 Ohms Ö loop insulation resistance : higher than 10 M Ohms Ö ground insulation resistance : higher than 10 M Ohms

wires.

15.3.2 Loss at 400 KHz

It is practically admitted that a line should have a maximal loss of 28 dB at 400 kHz for an xDSL use. This measurement is done with a 400 kHz / 0 dBm signal generator at one end of the line and a level / frequency receiver at the other end. Both generator and receiver should be set for 120 Ohms impedance.

15.3.3 Frequency Response Vs Rate

The best measurement consists in measuring the full frequency response of the line over the entire spectrum used at a given xDSL rate. The line is suitable when it shows a linear response free of discontinuity with a maximum loss of -38 dB in the following frequ ency

anges : r

Rate (Kbps)

Frequency

0 to (kHz)

144 272 400 528 784 1040 1552 2064 2320 4640

90 110 170 220 320 330 380 400 450 600

15.3.4 Summary

Characteristic Result

Loop resistance < 500 Ohms Loop insulation resistance > 10 M Ohms 400 kHz loss < 28 dB

If the trouble remains after the above verification, please contact your distributor or call CXR Hot Line

E-mail at: ajsupport@cxr.com Telephone: 1.408.573.2700

MD 2000 - Page 41

Instruction Manual MD 2000

16 Appendix

16.1 Appendix A – Wiring

16.1.1 Serial Control Port - RJ-45

1….….8

Pin # Signal I/O Description DB9

1 107 - DSR OUT Modem ready - permanent 6 2 109 - CD OUT Modem connected - permanent 1 3 108 - DTR IN Data terminal ready 4 4 102 - GND - Ground 5 5 104 - RXD OUT Received data by the terminal 2 6 103 - TXD IN Transmitted data by the

7 106 - CTS OUT Modem ready to transmit 8 8 105 - RTS IN Terminal ready to transmit 7

An adapter cable is provided to connect to the DB9 socket of most PC COM port.

terminal

16.1.2 RJ11 - Line Jack

1….….6

Pin Signal Description

1.. 2 x Not connected 3 A A Wire 4 B B Wire

5..6 x Not connected

Connect the 2 wires in the middle of the connector. An RJ11 cable terminated with screw-on connections is provided with the modem

16.1.3 Jack – Alarm Relay

The relay contacts are provided on a 3.5mm jack connector. The connector provides the following contacts:

¾ Common ¾ Contact normally open: ring contact: NO ¾ Contact normally closed: tip contact: NC

Contact NC

Contact NO Common

MD 2000 - Page 42

Instruction Manual MD 2000

16.2 Appendix B : Product Line Warranty

Products manufactured by CXR Telcom Corporation are guaranteed to be free of defects in materials and workmanship for a period of one year from the date of shipment. CXR Telcom will accept returned items, transportation prepaid to the service center, for repair during the warranty period at no cost to the customer, provided that the products have not been subjected to improper installation, accident, misuse, neglect, or unauthorized alterations.

Certification

CXR Telcom Corporation certifies that all products are thoroughly tested and inspected and found to meet manufacturers’ specifications when shipped from the factory.

Inspection

o All products manufactured by CXR Telcom are carefully inspected and thoroughly tested prior to shipment. Modern

packaging techniques are used to prevent damage during shipment. If goods are received in a damaged condition

CLAIM SHOULD BE FILED WITH THE TERMINATING CARRIER IMMEDIATELY

want to inspect the shipping carton and packing materials.

Repair service

o If equipment does not operate properly when tested in accordance with the instructions, it should be returned to an

authorized service center for repair.

prior to shipping any equipment to the factory

taken to avoid shipping damage. If available, use the original cartons and packing material. Shipping charges should be prepaid.

o If the equipment is covered by warranty, it will be repaired free of charge or replaced, at the Company’s option, and

returned prepaid. Unauthorized field repairs or modifications will invalidate the warranty.

o For out-of-warranty repair work, customer service will provide a quotation for repair charges first, unless the shipment is

accompanied by a purchase order. Repair work will be performed after authorization to proceed (in the form of a purchase order) is received.

. Normally, the carrier will

Call or write customer service for a Return Material Authorization

. When returning equipment for repair, utmost care should be

Service Center

o CXR TELCOM CORPORATION

Attn: Customer Service 894 Faulstich Court San Jose, CA 95112

Tel: 408.573.2700 Fax: 408.573.2708

www.cxr.com

MD 2000 - Page 43

CXR MD200 Installation And Operation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1.3 Installation and initial set-up

2.2 Rack mount Modem

2.3 Automatic Self-Test

3 Display and Switches

3.1.2 The push button

4.2 T1 / E1 G.704 link

4.3 LAN to LAN connection

4.4 V.35-X.21 terminal connection

4.5 G.704 to J64 (G.703 - 64 Kbps) connection

5.1 Factory and User Configurations

5.2 VT100 Interactive Menus

5.3 AT Command Mode

5.4 General Parameters and Commands

5.4.2 Configuration and Control

6 V.35 and X.21 - V.11 Interfaces

6.2 Interface Configuration

6.2.1 X.21 - V.11 Interface Configuration

6.2.2 V.35 Interface Configuration

7 10BT and 8 port HUB Bridge Interface

7.3 Wiring of the RJ-45 Connector

7.3.1 RJ-45 on the 10BT Bridge

7.3.2 RJ-45 on the HUB 8 port Bridge

8 E1 G.703-G.704 Interface Configuration

8.2 E1 Interface Configuration

8.3 RJ-45 Connector Wiring

9 T1 G.703-G.704 Interface Configuration

9.2 T1 Interface Configuration

9.3 RJ-45 Connector Wiring

13 System Memory

14 Technical Specifications

16 Appendix