Multitech MT202TD User manual

Model MT202TD
1200 BPS Leased Line Modem
User Guide

User Guide
MT202TD
P/N 82096501 Revision B
COPYRIGHT
This publication may not be reproduced, in whole or in part, without
prior expressed written permission from Multi-Tech Systems, Inc. All
rights reserved.
Copyright©2000-2001, by Multi-Tech Systems, Inc.
Multi-Tech Systems, Inc. makes no representations or warranties with
respect to the contents hereof and specifically disclaims any implied
warranties of merchantability or fitness for any particular purpose.
Furthermore, Multi-Tech Systems, Inc. reserves the right to revise this
publication and to make changes from time to time in the content
hereof without obligation of Multi-Tech Systems, Inc. to notify any
person or organization of such revisions or changes.
Revision Date Description
B 3/30/01 DIP Switch settings updated. Moved
connections into separate section.
PATENTS
This device is covered by one or more of the following patents:
6,031,867; 6,012,113; 6,009,082; 5,905,794; 5,864,560; 5,815,567;
5,815,503; 5,812,534; 5,809,068; 5,790,532; 5,764,628; 5,764,627;
5,754,589; D394,250; 5,724,356; 5,673,268; 5,673,257; 5,644,594;
5,628,030; 5,619,508; 5,617,423; 5,600,649; 5,592,586; 5,577,041;
5,574,725; D374,222; 5,559,793; 5,546,448; 5,546,395; 5,535,204;
5,500,859; 5,471,470; 5,463,616; 5,453,986; 5,452,289; 5,450,425;
D361,764; D355,658; D355,653; D353,598; D353,144; 5,355,365;
5,309,562; 5,301,274. Other Patents Pending
TRADEMARKS
Multi-Tech and the Multi-Tech logo are trademarks of Multi-Tech
Systems, Inc. Multi-Tech Systems, Inc.
2205 Woodale Drive
Mounds View, Minnesota 55112
[phone] or [phone]
Fax [phone]
Technical Support [phone]
Internet Address: http://www.multitech.com

Contents
Chapter 1 - Introduction and Description .........................5
Introduction ...........................................................................5
Description ............................................................................5
Technical Specifications ........................................................6
Chapter 2 - Installation and Connection ...........................8
Introduction ...........................................................................8
Power ....................................................................................8
Safety Warnings....................................................................8
Unpacking the Modem ..........................................................9
Modem LED Indicators........................................................10
Controls on PC Board .........................................................11
Computer or Terminal Connections.....................................12
MT202TD RS-232 Signal Descriptions ...............................13
Modem and Phone Line Connection...................................14
DIP Switch Settings.............................................................15
DIP Switch and Switch Settings & Functions ......................16
Leased Line Connections....................................................17
Chapter 3 - Modem Testing ..............................................18
Introduction .........................................................................18
Local Analog Loopback Test ...............................................18
Digital Loopback Test ..........................................................19

Chapter 4 - Warranty, Service,
and Technical Support................................................20
Limited Warranty .................................................................20
Online Warranty Registration ..............................................20
Service ................................................................................21
Technical Support................................................................22
Internet Sites .......................................................................22
Recording Modem Information............................................22
Appendix - Regulatory Compliance.................................23
FCC Part 15 – ClassA Statement .......................................23
FCC Part 68 Telecom ..........................................................24
Index...................................................................................26

Chapter 1 - Introduction & Description
5
Chapter 1 - Introduction and Description
Introduction
This manual provides instruction for installing, cabling,
operating, and troubleshooting Multi-Tech System’s model
MT202TD 1200 bps modem.
Description
The MT202TD is a low speed asynchronous modem which
employs Frequency Shift Keyed (FSK) modulation and works
in full duplex over four-wire or in half-duplex over two-wire
leased line networks.
The MT202TD is compatible with all Western Electric series
202 leased line data sets, except those with reverse channel.
The MT202TD is compatible with Western Electric 202 and
202T data sets as well as older 202-C, 202-D, 202-E, and
202-R models.

MT202TD User Guide
6
Technical Specifications
Your MT202TD modem meets the specifications listed below:
Model Number MT202TD
Data Rate 0–1200 bps
Compatibility Western Electric 202 and 202T
Data Sets, 202C, 202D, 202E,
202R models
Mode of Operation 2-wire half duplex or 4-wire full
duplex
Line Requirements 2- or 4-wire leased line
unconditioned
Modulation Frequency Shift Keyed (FSK)
Carrier Frequencies Mark:1200Hz; Space: 2200Hz;
Soft Carrier: 900Hz
Transmit Level -0 dBmAdjustable to -9 dBm via
Dip switch
Frequency Stability ±0.01% (crystal controlled)
Receiver Sensitivity -40 dBm under worst case
conditions
Timing Request to Send/ Clear to Send:
180 ms
Carrier Detect:
Turn on 30 ms
Turn off 10 ms
Receiver Squelch:
Default 156 ms
Soft Carrier:
Default 25 ms
Minimum 10 ms

Chapter 1 - Introduction & Description
7
Interface EIA RS-232C / ITU-T V.24
Connectors One DB-25 RS-232 C connector
(25-pin female connector),
external power transformer, RJ11
line jack
Diagnostics Analog loopback and digital
loopback
Indicators LEDs for Transmit Data, Receive
Data, Carrier Detect, Clear to
Send, Request to Send, Data Set
Ready, and Test Mode
Controls Switches for analog loopback and
digital loopback tests, DIP switch
for 2- or 4-wire leased line
selection, Local Copy, 0 or -9dBm
transmit level selection, Request
to Send, and Receiver Squelch
Operating Temperature 0° to 50° C (32° to 120° F)
Power Requirements 117 VAC, 60Hz, .1 amp
Dimensions MT202TD 10.8 cm wide x 14.8 cm long x 2.9
cm high
(4.25 inches wide x 5.8 inches
long x 1.15 inches high)
Weight 224 g (8 oz.)
Limited Warranty Two years

MT202TD User Guide
8
Chapter 2 - Installation and Connection
Introduction
The installation of the MT202TD consists of setting DIP
switches to the appropriate settings and then making the serial,
phone line, and electrical power connections.
Power
Power is supplied to model MT202TD through anAC power
transformer. The transformer supplies low voltage DC to the
modem and plugs into any conventional 117 VAC, 60 Hz,
power outlet.
Warning: Use only the power transformer supplied with the
modem. Use of any other transformer could cause damage to
the modem.
Safety Warnings
lNever install telephone wiring during a lighting storm.
lNever install telephone jacks in wet locations unless the
jack is specifically designed for wet locations.
lThis product is to be used with UL- and CUL-listed
computers.
lNever touch uninsulated telephone wires or terminals
unless the telephone line has been disconnected at the
network interface.
lUse caution when installing or modifying telephone lines.
lAvoid using a telephone (other than a cordless type) during
an electrical storm. There is a remote risk of electrical
shock from lightning.
lDo not use the telephone to report a gas leak in the vicinity
of the leak.
lTo reduce the risk of fire, use only 26 AWG or larger
telecommunication line cord.

Chapter 2 - Installation & Connection
9
Unpacking the Modem
Remove all items from the box.
Figure 2-1. Unpacking the MT202TD
The packing box contains the following items:
l One MT202TD modem
l One MT202TD User Guide
l One power transformer
l One RJ11/RJ11 cable
l One RJ11/RJ48 cable
If any of these items are missing, please contact Multi-Tech
Systems or your dealer/distributor.

MT202TD User Guide
10
Modem LED Indicators
MT202TD
RD CD CTS
RTS
DSR
TM
TD
Figure 2-2. LED Display
The MT202TD has seven diagnostic LED indicators. They are:
TD Transmit Data - This LED blinks when data is being
transmitted: on for a space; off for a mark. The state of
this LED matches the TD circuit on Pin 2 of the RS-
232C/V.24 interface.
RD Receive Data - This LED blinks when data is being
received: on for a space; off for a mark. The state of this
LED matches that of the RD circuit on Pin 3 of the RS-
232C/V.24 interface.
CD Carrier Detect - This LED lights when a valid carrier
tone has been detected.
CTS Clear to Send - This LED lights when the modem
responds to a Request to Send signal after a fixed
delay. The terminal equipment may start transmitting
data after this signal is on (high).
RTS Request to Send - This LED lights when the Request
to Send signal from the DTE is on.
DSR Data Set Ready - This LED lights when the modem is
powered on.
TM Test Mode - This LED lights when the modem is in Test
Mode.