CXR MD200 User manual

Instruction Manual MD 2000
MD 2000
mDSL MODEM
Installation
& Operation Manual
P/N: 8000 601 620
Revision: 0B
CXR Telcom Corporation
894 Faulstich Court
San Jose, CA 95112
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.cxr.com
MD 2000 - Page 1

Instruction Manual MD 2000
Warning
This publication contains information that is the property of CXR Anderson Jacobson. No part of this publication may be copied,
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.
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 5How to configure the equipment
Chapter 6The V.11 and V.35 DTE interfaces
Chapter 7The 10BT and HUB DTE interfaces
Chapter 8The E1 G.703/G.704 line interface
Chapter 9The 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
1INTRODUCTION........................................................................................................................................................................... 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
2INSTALLATION.......................................................................................................................................................................... 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
3DISPLAY AND SWITCHES........................................................................................................................................................ 15
3.1 FRONT PANEL WITH LED’S..................................................................................................................................................... 15
3.1.1 LED Display...................................................................................................................................................................... 15
3.1.2 The push button................................................................................................................................................................ 16
4TYPICAL 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
5OPERATION 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)
6X.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
710BT 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
8E1 G.703-G.704 INTERFACE CONFIGURATION ..................................................................................................................... 36
8.1 GENERAL............................................................................................................................................................................... 36
8.2 E1 INTERFACE CONFIGURATION.............................................................................................................................................. 38
8.3 RJ-45 CONNECTOR WIRING ................................................................................................................................................... 39
9T1 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
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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 they 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
V
ersions
Characteristics 2011 2035 20BT 20HUB 2703 20T1 2064 1064 1028 1011 1035
V28-V24 - RS232 interface
z
V.11-X.21 interface z
z
V.35 interface z
z
10BT filtering bridge
z
Bridge + HUB 8 port interface z
E1 G.703-G.704 interface z
T1 G.704 interface
z
64K-J64 interface
zz
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
Example: The MD 2035 PIU is the model number for a desktop version equipped with a V.35 interface, 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 desktop enclosure, must be carried out
by maintenance person qualified by CXR.
The equipment must imperatively be returned to CXR in any case of anomaly, fall, loss of performance, water exposure, power supply
damage, …
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:
¾Ethernet 802.3
¾Frame buffer memory : 256
¾Mac address memory : 10.000
•E1 G.703-G.704 interface :
¾rate : 2.048 Mbps
¾coding : HDB3
¾framing : 32 time slots – G.704 compatible
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Instruction Manual MD 2000
¾receiver sensitivity : -40 dB
•T1 interface :
¾rate : 1.544 Mbps
¾coding : B8ZS or AMI
¾framing : 24 time slots with F bit – G.704 compatible
¾line build outs : DSX-1 and CSU
¾receiver 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 :
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.
V28 -
RS232 : this interface carries synchronous links at 64Kbps or 128Kbps, or asynchronous data at 300 to 115,200 bps by
synchronous over sampling.
E1 G.703-
G.704
interface :
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.
T1 G.704
interface : 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.
J64 64
Kbps-
G.703
interface :
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.
10BT and
HUB
interface :
the built-in Ethernet bridge filters the frames in accordance with their destination MAC address. Only frames with non-
local 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 provides a regulated 5 VDC from the mains 110/230 VAC.
Internal
power
supply
the modem includes a 110/230 VAC - 5 VDC power converter which connects directly to the power outlet via the
supplied power cord.
Internal 48
VDC
converter
the modem includes a 48 VDC power converter, which can be connected to a 48VDC supply commonly available in
telecom centers.
Rack-
mountable
card
the 5 VDC 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 VAC or 48 VDC depending on the type of power module installed with provision
for full redundancy.
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
¾The LTU Network modem – disable lower rate fall back : %H0 parameter
¾NTU 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 TCP-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:
¾In case of power loss
¾In case of error during the power up self test
¾In case of a carrier loss during a time period longer than a preset threshold
¾By 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.
OFF ON
110/230Vac
LINE CONTROL
Back View
TERMINAL
SELVLeased
line access
SELV
V24
DTE
SELVAccess*
*SELV = Safety low voltage
(**) 110/230VAC / 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 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 interface – (MD 2703, MD 20T1, MD 2064 versions)
•This user Manual
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Instruction Manual MD 2000
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* acces
s
*SELV = Safety Low Voltage
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
SHELF
IN
SHELF
OUT
MODEM
CTL
230V
50HZ
2AMAX
CLASSEI
+10%
-15%
-
48V
+
CGND
SGND
NO
C
NC
SPARE
ALARM
ADMIN
RUEDEL'ORNETTE 28410 ABONDANT
NUMERODESERIE
SERIALNUMBER
AMS16-2
DATEDEFABRICATION
YEAROFMANUFACTURING
FABRIQUEENFRANCE/ MADEINFRANCE
DEVICES
LI
N
E1
-
LI
N
E
2
/L
S
T
E
R
MI
N
A
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ANDERSON
JACOBSON
10BT
O
I
2.2.4 Powering
•The modem card connects to the chassis power supply when it is fully inserted. The chassis is powered on and off through the rear
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:
9Program memory
9Data memory
9Non volatile memory
9DSP
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
* DTR-INTF CD CTS DATA TEST MODE
CTRL 108 109 106 103-104 142
LED Circuit Function
* / CTRL
(Control) 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)
DTR - INTF
(Data Terminal
Ready)
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.
CD - 109
(Carrier
Detect)
109 ON when the modem 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
CTS
(Clear To
Send)
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.
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
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.
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.
AT Commands to modem
T1 E1
Configuration A B A B
1. E1 / T1 transparent link, the central office
provides the transmit clock (A side) and the PBX
is slaved on this clock
¾NTU / LTU mode
¾1.544 (T1) or 2.048 (E1) Mbps
rate
¾external clock
%01
@U24
&X1
%00
@U24
&X1
%01
@U32
&X1
%00
@U32
&X1
2. TS0 toTS15 only are transported to increase
the reach – Clocking unchanged :
¾NTU / LTU mode
¾1.024 Mbps rate
¾external clock
%01
@U16
&X1
%O0
@U16
&X1
%01
@U16
&X1
%O0
@U16
&X1
G703 MD 20T1 DSL Line MD 20T1 G703
Central G704 A B PABX
3. Idem, but TS1 to TS16 are transported and
modem control CRC4 (E1 mode only) :
¾NTU / LTU mode
¾1.024 Mbps rate
¾external clock
¾start timeslot = 1
¾CRC on
%O1
@U16
&X1
@S1
@C1
%O0
@U16
&X1
@S1
@C1
4. One modem is set for internal clock IF both
ends expect a clock from the network (typically to
interconnect 2 PBX) :
¾NTU / LTU mode
¾internal clock on A, external on B
%01
&X0
%00
&X1
%01
&X0
%00
&X1
4.3 LAN to LAN connection
8 stations may be linked to the remote LAN via the MD2000 and its bridge interfaces.
LAN DSL line
MD 20BT MD 2HUB
A B
Server
PC1 - - - PC8
Only two parameters should be set in most cases:
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 A B
1. 2.048Mbps link, clocks provided by the modems
¾NTU / LTU mode
¾2.048 Mbps rate
¾internal clock
%01
@U32
&X0
%00
@U32
&X0
2. TX clock provided by the V.35 terminal :
¾NTU / LTU mode
¾2.048 Mbps rate
¾external / slave clock
%01
@U32
&X1
%00
@U32
&X2
4.5 G.704 to J64 (G.703 - 64 Kbps) connection
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
modem
Configuration 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.
¾NTU / LTU mode
¾2.048 Mbps rate
¾external clock
¾Start timeslot: TS1
¾CRC4 control
%01
@U1
&X1
@S1
@C1
%00
&X1
MD 2000 - Page
13

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.
CXR - MD 2000 : Management Menu
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)
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.
CXR - MD 2000: MODEM CONFIGURATION
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. ON suppress Ethernet padding bits
Enter the option number to edit :
or P : Previous page / or Q: Quit
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Instruction Manual MD 2000
Menu 2: Save and Restore Configuration from Memory
CXR - MD 2000 : MEMORY MANAGEMENT
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)
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
CXR - MD 2000 : LOOP TEST
1 - LOCAL ANALOG LOOP TEST
CHOICE : 1, P(previous), Q(quit)
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 LAST 15' CUR 15' CUR HR LAST 24 HR
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.
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 “ENTER»). Between are the parameters
and their value.
As an example: 'AT%O0<CR>'
¾AT is the command identifier
¾%O Is the master or slave selection command
¾0 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
OK
Response to an 'AT&S6<CR>' command
MD 2000 - Page 17
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

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. When 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 re-
initialization.
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 +R0 resets to OFF position
+R1 sets to ON position
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 re-
established, 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.
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 Display"
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 (:) for a validity check at initiation.
Format: AT%PS:xxxxx:xxxxx
xxxxx password of up to 12 characters.
%PO Command "Operator Password"
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 (:) for a validity check at initiation.
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
%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
MD 2000 - Page 20