Multi Tech Systems Network Card MT202TD 1200 User Manual

Model MT202TD  
1200 BPS Leased Line Modem  
User Guide  
 
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 – Class A 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.  
5
 
MT202TD User Guide  
Technical Specifications  
Your MT202TD modem meets the specifications listed below:  
Model Number  
Data Rate  
MT202TD  
0–1200 bps  
Compatibility  
Western Electric 202 and 202T  
Data Sets, 202C, 202D, 202E,  
202R models  
Mode of Operation  
Line Requirements  
2-wire half duplex or 4-wire full  
duplex  
2- or 4-wire leased line  
unconditioned  
Modulation  
Frequency Shift Keyed (FSK)  
Carrier Frequencies  
Mark:1200Hz; Space: 2200Hz;  
Soft Carrier: 900Hz  
Transmit Level  
-0 dBm Adjustable to -9 dBm via  
Dip switch  
Frequency Stability  
Receiver Sensitivity  
0.01% (crystal controlled)  
-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  
6
 
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  
Indicators  
Analog loopback and digital  
loopback  
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  
Power Requirements  
Dimensions MT202TD  
0° to 50° C (32° to 120° F)  
117 VAC, 60Hz, .1 amp  
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.)  
Two years  
Limited Warranty  
7
 
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 an AC 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  
l
Never install telephone wiring during a lighting storm.  
l
Never install telephone jacks in wet locations unless the  
jack is specifically designed for wet locations.  
l
l
This product is to be used with UL- and CUL-listed  
computers.  
Never touch uninsulated telephone wires or terminals  
unless the telephone line has been disconnected at the  
network interface.  
l
l
Use caution when installing or modifying telephone lines.  
Avoid using a telephone (other than a cordless type) during  
an electrical storm. There is a remote risk of electrical  
shock from lightning.  
l
l
Do not use the telephone to report a gas leak in the vicinity  
of the leak.  
To reduce the risk of fire, use only 26 AWG or larger  
telecommunication line cord.  
8
 
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.  
9
 
MT202TD User Guide  
Modem LED Indicators  
Figure 2-2. LED Display  
The MT202TD has seven diagnostic LED indicators. They are:  
TD  
RD  
CD  
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.  
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.  
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.  
10  
 
Chapter 2 - Installation & Connection  
Controls on PC Board  
The MT202TD circuitry is on a single printed circuit (PC) board.  
This board contains one 8-position DIP switch (numbered 1-8),  
an analog loopback test switch, and a digital loopback test  
switch. The factory default setting is for 4-wire, full-duplex  
operation in normal mode. If you are using the modem in a 2-  
wire configuration or using one of the test modes, you must  
change the switch positions. Refer to page 19 for switch  
setting and function information.  
Digital Loopback  
Switch (DLB)  
Analog Loopback  
Switch (ALB)  
DIP-Switches  
(1-8)  
3
1
2
4
5
6
7
8
LED Indicators  
Default Switch  
Positions  
Figure 2–3. PC Board Controls  
11  
 
MT202TD User Guide  
Computer or Terminal Connections  
Your computer or terminal is connected to the MT202TD via the  
modem’s EIA RS-232C / ITU-T V.24 interface connector. This  
connector is a standard interface, with a 25-socket female  
connection. Therefore, your computer or terminal requires a  
standard RS-232C / V.24 cable with a male connector on the  
modem end, and a male or female connector at the computer  
or terminal end, depending upon the computer or terminal  
connector.  
Plug the RS-232C / V.24 cable into the RS-232C / V.24 con-  
nector on the modem. If screws were provided with your cable,  
insert and tighten the screws to secure the connection.  
Although the RS-232C / V.24 interface connector is designed  
for 25 signal paths, only eight of these signals are used by the  
MT202TD.  
If your computer or terminal did not come with an RS-232C /  
V.24 cable, you may purchase a standard “straight-through”  
RS-232C / V.24 cable from your local computer retailer.  
12  
 
Chapter 2 - Installation & Connection  
MT202TD RS-232 Signal Descriptions  
Pin MTS Circuits  
Name EIA ITU-T  
Function  
Signal  
Source  
2
3
4
5
6
7
8
SD  
BA 103  
Transmitted Data  
Received Data  
DTE  
DCE  
DTE  
RD BB 104  
RTS CA 105  
CTS CB 106  
DSR CC 107  
SG AB 102  
CD CF 109  
Request to Send  
Clear to SendDCE  
Data Set Ready  
Signal Ground  
DCE  
-----  
Data Carrier  
Detector  
DCE  
9
+V +V -----  
Test Voltage  
DCE  
DTE= Data Terminal Equipment (terminal or computer)  
DCE= Data Communications Equipment (the modem)  
13  
 
MT202TD User Guide  
Modem and Phone Line Connection  
This section describes how to install and connect the  
MT202TD.  
Installation Steps:  
1. Verify that the remote modem is set for Bell 202- or 202T-  
compatibility.  
2. Connect the modem to the leased line jack using one of the  
two RJ11 cables provided with the modem.  
3. Remove the case (see the next page). Verify leased-line  
transmit level (DIP switch #5) setting is at either 0 dBm  
(down) or -9 dBm (up). Refer to the following page for more  
information on DIP switch settings.  
4. Attach the MT202TD to your PC or terminal with an RS-  
232 (or V.24) cable.  
5. Connect the power transformer to the modem and an AC  
outlet.  
PWR  
RS232  
LINE  
To DTE  
Figure 2-4. Back Panel Connectors  
14  
 
Chapter 2 - Installation & Connection  
DIP Switch Settings  
DIP switches are located on the MT202TD circuit board as  
shown in Figure 2-3. For information about DIP switch settings  
and functions, refer to the chart on page 19.  
To access the switches, remove the modem’s cover.  
To remove the cover:  
1. Unplug the power transformer from the wall socket.  
2. Unplug the phone line.  
3. Turn the modem upside down.  
4. Remove the two screws.  
5. Place the modem right side up.  
6. Remove the cover to expose the DIP switches.  
7. After completing the necessary DIP switch  
changes, replace the modem cover and screws  
before re-connecting the phone and power lines.  
Remove Screws  
Figure 2-5. Removing Screws  
15  
 
MT202TD User Guide  
DIP Switch and Switch Settings & Functions  
(See Figure 2–3.)  
Switch Function  
Position  
1
Local Copy Enable  
UP*  
Local Copy Suppress  
DOWN  
2
3
4
Two-Wire Lease Line  
Four-Wire Lease Line  
DOWN  
UP*  
Two-Wire Lease Line  
Four-Wire Lease Line  
DOWN  
UP*  
Two-Wire Lease Line  
Four-Wire Lease Line  
UP  
DOWN*  
5
6
Transmit 0 dBm  
Transmit -9 dBm  
DOWN*  
UP  
Request to Send Forced On  
Request to Send Controlled by DTE  
on Pin 4  
DOWN*  
UP  
7
Receiver Squelch Enable  
Receiver Squelch Disable  
DOWN*  
UP  
NOTE: UP equals OPEN  
DOWN equals CLOSED  
*********************************************  
ALB  
DLB  
Analog Loopback Test Mode  
Normal Mode  
ALB  
Normal*  
Digital Loopback Test Mode  
Normal Mode  
DLB  
Normal*  
* Indicates default position  
16  
 
Chapter 2 - Installation & Connection  
Leased Line Connections  
The MT202TD modem operates on leased lines and may  
be configured in two ways: two-wire or four-wire. In a  
leased-line application, the line is continuously connected  
to the modem. In two-wire leased-line applications, only  
one modem may transmit at a time (this is known as half-  
duplex). In a four-wire configuration, one pair of wires  
should connect to the transmitter of the local modem and  
the receiver of the remote modem. The other pair of wires  
should connect to the remote modem’s transmitter.  
UUUUU  
UUUUU  
Digital Analog  
Local Modem  
Analog Digital  
Computer or Terminal  
Remote Modem  
Computer or Terminal  
Figure 3-1. Four-Wire Leased Line Connection  
In multi-point leased line configurations, the user must  
arrange to have the phone company install the multi-point  
network using a four-wire configuration. The following  
illustration shows a typical bridged multi-point configura-  
tion.  
MT202T  
MT202T  
MT202T  
MT202T  
MT202T  
B
B
B
Boxes marked  
“B” are Bridge  
Circuits  
MT202T  
MT202T  
600 ohms 600 ohms  
Figure 3-2. Four-Wire Multi-Point Connection  
17  
 
MT202TD User Guide  
Chapter 3 - Modem Testing  
Introduction  
The MT202TD has two diagnostic tests: Local analog loopback  
and digital loopback.  
A loopback test involves entering data from your PC and  
looping that data through the circuits of your modem and/or a  
remote modem. When the loop has been completed, the data  
received on the monitor should match the data entered on the  
keyboard.  
The local analog loopback test allows you to verify that the  
modem’s transmit and receive circuits are functioning properly.  
Refer to the Local Analog Loopback section on the following  
page for more details.  
The digital loopback test allows you to verify that the local  
computer or terminal, the two modems, and the transmission  
line between the devices are functioning properly. See the  
Digital Loopback Test section in this chapter for more  
information.  
Local Analog Loopback Test  
The analog loopback test is performed by placing the analog  
loopback (ALB) switch in the ALB position (see Figure 2-3 in  
Chapter 2 of this user guide). When the switch is set to the ALB  
position, the CD, CTS, RTS, DSR, and TM indicators should  
light.  
In this test, data from your computer or terminal is sent to your  
modems transmitter, converted into analog form, looped back  
to the receiver, converted into digital form, and then received  
back at your monitor for verification. No connection to the  
phone line is required. The TD and RD indicators blink as keys  
are pressed. If your modem is configured for two-wire opera-  
tion, the Local Copy DIP switch must be enabled (see Chapter  
18  
 
Chapter 3 - Modem Testing  
2 for DIP switch setting information).  
CONNECT  
UUUUUUUU  
UUUU  
Digital Analog  
Computer or Terminal  
Local MultiModem  
Figure 3-3. Local Analog Loopback Test  
Digital Loopback Test  
The digital loopback test is an on-line test that loops data sent  
from one modem across the phone line to another modem, and  
then back to the first modem. This test checks the phone line  
and modem integrity.  
This digital loopback test is used on modems configured for  
four-wire leased lines. To perform this test, the DLB switch on  
the modems circuit board must be set to the DLB position (see  
Figure 2-3 in Chapter 2).  
In this test the local modem is placed in digital loopback mode.  
Data is entered and transmitted from the remote modem (which  
is not in digital loopback mode), sent across the phone line to  
the local modem, and looped back to the remote modem.  
OK  
UUUUUUUUU  
UUUUU  
Digital  
Analog  
Digital  
Analog  
Computer or Terminal Local MultiModem  
Remote MultiModem  
Computer or Terminal  
Figure 3-4. Digital Loopback Test  
19  
 
MT202TD User Guide  
Chapter 4 - Warranty, Service,  
and Technical Support  
Limited Warranty  
Multi-Tech Systems, Inc., (hereafter MTS) warrants that this  
product will be free from defects in material or workmanship for  
a period of two years from date of purchase, or if proof of  
purchase is not provided, two years from date of shipment.  
MTS MAKES NO OTHER WARRANTY, EXPRESS OR  
IMPLIED, AND ALL IMPLIED WARRANTIES OF MERCHANT-  
ABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE  
HEREBY DISCLAIMED.  
This warranty does not apply to any products which have been  
damaged by lightning storms, water, or power surges or which  
have been neglected, altered, abused, used for a purpose  
other than the one for which they were manufactured, repaired  
by Customer or any party without MTSs written authorization,  
or used in any manner inconsistent with MTSs instructions.  
MTSs entire obligation under this warranty shall be limited (at  
MTSs option) to repair or replacement of any products which  
prove to be defective within the warranty period or, at MTSs  
option, issuance of a refund of the purchase price. Defective  
products must be returned by Customer to MTSs factory —  
transportation prepaid.  
MTS WILL NOT BE LIABLE FOR CONSEQUENTIAL  
DAMAGES, AND UNDER NO CIRCUMSTANCES WILL ITS  
LIABILITY EXCEED THE PRICE FOR DEFECTIVE  
PRODUCTS.  
Online Warranty Registration  
To register your modem online, go to:  
20  
 
Chapter 4 - Warranty, Service & Technical Support  
Service  
In the event that service is required, products may be shipped,  
freight prepaid, to our Mounds View, Minnesota, factory.  
Please send modems that require repairs to the following  
address:  
Multi-Tech Systems, Inc.  
2205 Woodale Drive  
Mounds View, MN 55112  
Attn: Repairs, Serial #______  
A Returned Materials Authorization (RMA) is not required.  
Return shipping charges (surface) will be paid by MTS. Please  
include inside the shipping box a description of the problem, a  
return shipping address (must have street address, not P.O.  
Box), a telephone number, and if the product is out of  
warranty, a check or purchase order for repair charges.  
Extended two-year overnight replacement agreements are  
available for selected products. Please refer to our Overnight  
Replacement Agreement at:  
for details on rates and coverages.  
Please direct your questions regarding technical matters,  
product configuration, verification that the product is defective,  
etc., to our Technical Support department at 800-972-2439.  
Please direct your questions regarding repair expediting,  
receiving, shipping, billing, etc., to our Repair Accounting  
department at 800-328-9717 or 763-785-3500.  
Repairs for damages caused by lightning storms, water, power  
surges, incorrect installation, physical abuse, or user-caused  
damages are billed on a time-plus-materials basis.  
21  
 
MT202TD User Guide  
Technical Support  
Multi-Tech Systems has an excellent staff of technical support  
personnel available to help you get the most out of your Multi-  
Tech product. If you have any questions about the operation of  
this modem, please contact us at:  
Email:  
Phone:  
(800) 972-2439 or  
(763) 785-3500 (local)  
Internet Sites  
Multi-Tech is a commercial provider on the Internet.  
The Multi-Tech Web site is:  
The ftp site is:  
Recording Modem Information  
Please complete the following information about your Multi-  
Tech modem before calling Technical Support.  
Modem Model No.:_____________________  
Modem Serial No.: _____________________  
The modem model and serial numbers are printed on the  
bottom of your modem.  
Please note the status of your modem before calling tech  
support. The status includes information about LED indicators,  
screen messages, diagnostic test results, problems with a  
specific application, etc.  
22  
 
Appendix  
Appendix - Regulatory Compliance  
FCC Part 15 – Class A Statement  
This equipment has been tested and found to comply with the  
limits for a Class A digital device, pursuant to Part 15 of the  
FCC Rules. These limits are designed to provide reasonable  
protection against harmful interference when the equipment is  
operated in a commercial environment. This equipment  
generates, uses, and can radiate radio frequency energy, and  
if not installed and used in accordance with the instruction  
manual, may cause harmful interference to radio  
communications. Operation of this equipment in a residential  
area is likely to cause harmful interference in which case the  
user will be required to correct the interference at his own  
expense.  
This device complies with part 15 of the FCC Rules.  
Operation is subject to the following two conditions:  
(1) This device may not cause harmful interference.  
(2) This device must accept any interference that may cause  
undesired operation.  
Warning: Changes or modifications to this unit not expressly  
approved by the party responsible for compliance could void  
the users authority to operate the equipment.  
Industry Canada  
This Class A digital device meets all requirements of the  
Canadian Interference Causing Equipment Regulations.  
Cet appareil numerique de la classe A respecte toutes les  
exigences du Reglement Canadien sur le materiel brouilleur.  
23  
 
MT202TD User Guide  
FCC Part 68 Telecom  
1. This equipment complies with part 68 of the Federal  
Communications Commission Rules. On the outside  
surface of this equipment is a label that contains, among  
other information, the FCC registration number. This  
information must be provided to the telephone company.  
2. The suitable USOC jack (Universal Service Order Code  
connecting arrangement) for this equipment is shown  
below. If applicable, the facility interface codes (FIC) and  
service order codes (SOC) are shown.  
3. An FCC-compliant telephone cord and modular plug are  
provided with this equipment. This equipment is designed  
to be connected to the telephone network or premises  
wiring using a compatible modular jack that is Part 68  
compliant. See installation instructions for details.  
4. The ringer equivalence number (REN) is used to  
determine the number of devices that may be connected  
to the telephone line. Excessive RENs on the telephone  
line may result in the device not ringing in response to an  
incoming call. In most, but not all, areas the sum of the  
RENs should not exceed 5.0. To be certain of the nuber of  
devices that may be connected to the line, as determined  
by the total RENs, contact the local telephone company.  
5. If this equipment causes harm to the telephone network,  
the telephone company will notify you in advance that  
temporary discontinuance of service may be required. But  
if advance notice is not practical, the telephone company  
will notify you as soon as possible. Also, you will be  
advised of your right to file a complaint with the FCC if you  
believe it is necessary.  
24  
 
Appendix  
6. The telephone company may make changes in its  
facilities, equipment, operations, or procedures that could  
affect the operation of the equipment. If this happens, the  
telephone company will provide advance notice in order  
for you to make necessary modifications in order to  
maintain uninterrupted service.  
7. If trouble is experienced with this equipment (the model of  
which is indicated below) please contact Multi-Tech  
Systems, Inc. at the address shown below for details of  
how to have repairs made. If the trouble is causing harm  
to the telephone network, the telephone company may  
request you remove the equipment from the network until  
the problem is resolved.  
8. No repairs are to be made by you. Repairs are to be  
made only by Multi-Tech Systems or its licensees.  
Unauthorized repairs void registration and warranty.  
9. This equipment should not be used on party lines or coin  
lines.  
10. If so required, this equipment is hearing-aid compatible.  
Manufacturer:  
Model Number:  
Multi-Tech Systems, Inc.  
MT202TD  
FCC Registration No:  
Modular Jack (USOC):  
Service Center in USA:  
AU7-USA-46016-DM-N  
RJ11C  
Multi-Tech Systems, Inc.  
2205 Woodale Drive  
Mounds View, MN 55112  
(763) 785-3500  
(763) 785-9874 Fax  
25  
 
MT202TD User Guide  
L
Index  
LED Indicators 10  
Limited Warranty 7  
A
Line Requirements 6  
Local Analog Loopback Test 18  
Analog Loopback 18  
B
M
Back Panel Connectors 14, 15  
Mode of Operation 6  
Model Numbers 6  
Modem Connection 14  
Modem Testing 18  
Modulation 6  
C
Carrier Detect (CD) 10  
Carrier Frequencies 6, 7  
CCITT V.24 Interface Connector  
12  
Clear to Send (CTS) 10  
Compatibility 6  
Multi-Tech Internet Sites 22  
O
Online Warranty Registration 20  
Operating Temperature 7  
Computer Connections 12  
Controls 7  
P
D
Phone Line Connection 14  
Power Requirements 7  
Data Rates 6  
Data Set Ready (DSR) 10  
Dimensions MT202T-D 7  
DIP Switch Functions 16  
DIP Switch Settings 15  
R
Request to Send (RTS) 10  
Request to Send/ Clear to Send 6  
F
S
FCC Regulations 24  
Signal Descriptions 13  
Four-Wire Leased Line Connection  
17  
T
Four-Wire Multi-Point Connection  
17  
Technical Specifications 6  
Technical Support 22  
Timing 6  
I
Indicators 7  
Internet Addresses 22  
W
Warranty 20  
Weight 7  
26  
 
 
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