Multitech MT202TD Manuale utente

Model MT202TD

1200 BPS Leased Line Modem

User Guide

MT202TD

P/N 82096501 Revision B

This publication may not be reproduced, in whole or in part, without

prior expressed written permission from Multi-Tech Systems, Inc. All

rights reserved.

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

(763) 785-3500 or (800) 328-9717

Fax (763) 785-9874

Technical Support (800) 972-2439

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

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

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

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

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

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

Modem LED Indicators

MT202TD

RD CD CTS

RTS

DSR

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.

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