MOT202TSA/MOT202TRM
Modem User’s Guide
0049-0119-000, Rev. A
Contents
CHAPTER 3 LEDS AND CONTROLS........................................... 21
FRONT PANEL LEDS ............................................................................. 21
FRONT PANEL TEST SWITCH ................................................................. 22
CHAPTER 4 TROUBLESHOOTING ............................................. 25
LOCAL MODEM TEST ............................................................................ 25
LINE AND MODEM TEST........................................................................ 26
CHAPTER 5 SPECIFICATIONS..................................................... 27
GENERAL............................................................................................... 27
DIMENSIONS AND WEIGHT.................................................................... 28
TEMPERATURE RANGE.......................................................................... 28
POWER REQUIREMENTS ........................................................................ 28
INTERFACE PIN ASSIGNMENTS .............................................................. 29
DTE Connector - EIA RS-232-C ...................................................... 29
Telco Connector ............................................................................... 29
APPENDIX A COMPLIANCES....................................................... 31
APPENDIX B LIMITED PRODUCT WARRANTY ..................... 33
APPENDIX C, RMA PROCEDURE................................................ 35
Page iv
Chapter 1
Introduction
he Telenetics MOT202TSA standalone modem and
MOT202TRM rack-mount modem are Frequency Shift Keyed
T(FSK) modems designed for asynchronous half-duplex
communication on 2-wire private line circuits or full-duplex
communication on 4-wire private-line circuits.
Summary of Key Features
The following list summarizes the modem’s key features.
•
•
•
•
•
•
•
Bell 202T compatible
Operates over voice-grade leased lines or private lines
0 to 1200 bps operation for unconditioned line.
0 to 1800 bps operation for conditioned line (C2).
Point-to-point or point-to-multipoint polling network
4-wire full-duplex or 2-wire half-duplex leased-line configuration.
Analog Loopback Test, Digital Loopback Test, Self Test, and Test
Pattern Transmit.
•
LED displays for power, RS-232 control, data status, and test
mode.
Page 5
Introduction
Models
The Telenetics modem is available in two models:
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™
The MOT202TSA is a desktop modem.
The MOT202RTM is a rack-mount modem that installs into a
standard 19-inch rack.
In this manual, the term “modem” will be used to refer to both models
collectively. If information pertains to one model only, that model will
be identified by its model number.
Using This Manual
This manual contains all the information you need to install, configure,
use, and test your modem.
™
Chapter 1 contains general information on what the 202T modem
does, contents of this manual, and contact information for
Telenetics.
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™
™
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Chapter 2 describes how to install and configure the modem.
Chapter 3 provides general operating procedures.
Chapter 4 provides troubleshooting procedures.
Chapter 5 lists the modem’s specifications.
Page 6
Contact Information
Contact Information
For more information about Telenetics’ MOT202TSA and
MOT202TRM modems, or other Telenetics solutions, please contact us
using any of the following methods.
Voice Calls
We welcome your calls at (949) 455-4000 Monday
through Friday, from 8:00 am to 5:00 pm Pacific Time.
Fax Number
You can also send your requests for information to our
24-hour fax number: (949) 455-4010.
E-mail
If you prefer, you can send information requests to our
Website
Our website contains valuable information about our
products. We encourage you to visit us online at
Page 7
Introduction
NOTES
Page 8
Chapter 2
Installing the Modem
his chapter describes how to install the modem.
T
Site Preparation
The location where you install your modem should be:
•
Within six feet of a 115 or 230 VAC grounded outlet not controlled
by a wall switch
•
•
No more than 50 feet from the data terminal equipment
Away from extremes of temperature, humidity, and appreciable
shock.
Be sure that there is a 4-inch minimum space at the
back of the modem for signal line and interface cable
clearance.
Note:
Unpacking Your Hardware
Your package should include at least one MOT202TSA or
MOT202TRM modem, one RJ-45 jack-to-4 wire leased line cable, and
this Installation Guide. If your package contents are damaged or
missing, please contact your place of purchase immediately.
Page 9
Installation
Additional Items You Need
To use your modem, you need the following additional items:
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™
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All users: an RS-232 cable to connect a data terminal. The cable
must conform to the pin assignments shown on page 29.
Standalone modem users: a two- or four-wire transmission line or
leased line and power supply.
Rack-mount modem users: a modem rack and an available slot in
the rack for installing the modem.
Hardware Overview
Figures 2-1 and 2-2 show the front and back modem panels.
Figure 2-1. Front Panel
Figure 2-2. Back Panel
Page 10
Configuring the Modem
On the front panel of the modem, there are:
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One Power LED and six status LEDs (see page 21)
A rotary test switch (see page 22)
On the back panel of the MOT202TSA modem, there are:
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A power cord or power input connector
A power switch for turning the modem on and off
A fuse, 3/8 amp, 250 Volt, slow-blow
A DB25 female connector for accommodating a DTE device
An RJ-45 connector for connecting to a communications line
Configuring the Modem
The modem obtains some operating characteristics from jumper
settings. The default jumper settings are for common 4-wire full-duplex
applications. To reconfigure the modem for 2-wire half-duplex and
special applications, you must change the default jumper settings.
To change jumper settings, push the two tabs on the back of the modem
to open the modem cover and gain access to the jumper settings on the
printed circuit board (see Figure 2-3). Then set the jumpers to the
desired settings and replace the cover.
Figure 2-3. Gaining Access to the Modem Jumpers
Figure 2-4 on the next page shows the location of the modem jumpers.
Table 2-1 on page 13 summarizes the jumper settings (default settings
are bold).
Page 11
Installation
Figure 2-4. Modem Jumper Locations
Page 12
Configuring the Modem
Table 2-1. Jumper Settings
Jumper
S1
Function
Carrier Detect control
Settings
-33 dBm
See Page…
14
-43 dBm
Transmit level
14
S2
0dBm
-2 dBm
-4 dBm
-6 dBm
-8 dBm
-10 dBm
-12 dBm
-14 dBm
2-wire
2-wire/4-wire mode
Call turnaround squelch
Transmit carrier
15
15
16
16
16
17
S3
S4
S5
S6
S8
S9
4-wire
Enabled
Disabled
Control
Constant
Enabled
Disabled
Connected
Separate
8 ms
Local copy
Signal and Earth ground
RTS-CTS delay
33 ms
59 ms
219 ms
Carrier Detect delay
17
17
18
S10
S11
S12
6 ms
23 ms
8 ms
159 ms
Turnaround squelch time
(Enabled by jumper S4)
Soft Carrier turn off
None
8 ms
26 ms
Anti-streaming
18
S13
None
4 seconds
7.6 seconds
14 seconds
28 seconds
56 seconds
1 bps
Self Test or test pattern
19
S14 and S15
(Tx and Rx pattern speed)
18 bps
37 bps
75 bps
150 bps
Page 13
Installation
The jumper positions in the following sections reflect the
Note:
position of the jumpers on the modem board when you face
the board as indicated in Figure 2-4 on page 12.
Jumper S1 − Carrier Detect Control
-33 dBm (default)
-43 dBm
Settings:
Jumper S1 configures the dynamic range of the modem receiver. The
selections are either –33 dBm or –43 dBm. If the incoming signal is
above –24 dBm, use the default –33 dBm setting. If the modem is
operated on the network, use the –43 dBm setting.
Jumper S2 − Transmit Level
0 dBm (default)
-2 dBm
Settings:
-4 dBm
-6 dBm
-8 dBm
-10 dBm
-12 dBm
-14 dBm
Jumper S2 adjusts the modem’s transmit level. There are eight transmit
level settings you can choose. By default, the modem uses a transmit
level of 0 dBm.
Page 14
Configuring the Modem
Jumper S3 − 2-wire/4-wire Mode
2-wire
4-wire (default)
Settings:
Jumper S3 configures the modem for 2-wire or 4-wire operation.
™
When configured for 4-wire full-duplex operation, jumper S5 can
be strapped to maintain constant carrier from the master modem to
all slave modems at all times after the initial training. This enables
the master modem to transmit data to the slave modems, with no
RTS-to-CTS delay. This is the preferred operating mode when
minimum turnaround is desired.
™
When configured for 2-wire half-duplex operation, the modem
encounters an RTS-to-CTS delay when transmitting to slave
modems, increasing the turnaround time. Set jumper S5 to
controlled carrier for 2-wire half-duplex operation.
Jumper S4 − Call Turnaround Squelch
Enabled
Disabled (default)
Settings:
Jumper S4 configures the modem’s Call Turnaround Squelch setting.
For 2-wire, half-duplex communications, set this strap to the Enabled
position. In this position, the receiver is inhibited for a period of time
after the local transmitter is turned OFF. This guards against echoes
caused by the transmission just completed. The time is determined by
the turnaround squelch time option (jumper S11).
For 4-wire, full-duplex communications, keep the jumper set to the
default position of Disabled.
Page 15
Installation
Jumper S5 − Transmit Carrier
Control (default)
Constant
Settings:
Jumper S5 places the transmitter under terminal control (default) or
turns on the transmitter continuously in a 2-wire half duplex system.
Jumper S6 − Local Copy
Enabled
Disabled (default)
Settings:
Jumper S6 must be left is the default position of Disabled when
operating on a 4-wire network. It is also normally left in the default
Disabled position when operating on a 2-wire network. Strapping this
jumper as Disabled inhibits the local receiver from receiving the
transmission of the local transmitter.
Jumper S8 − Signal and Earth Ground
Connected
Separate (default)
Settings:
Jumper S8 allows Earth GND to be tied to the modem system GND.
Page 16
Configuring the Modem
Jumper S9 − RTS-CTS Delay
8 ms (default)
Settings:
33 ms
59 ms
219 ms
Jumper S9 configures the modem’s RTS-CTS delay. Four choices for
selecting an RTS-CTS delay are available.
Jumper S10 − Carrier Detect Delay
6 ms (default)
23 ms
Settings:
Jumper S10 configures the modem’s Carrier Detect turn on Delay
timing. The delay chosen must be consistent with the Clear To Send
delay selection of the transmitting modem and must be less than the
CTS delay. The available delays are 6 ms (default) and 23 ms. The
carrier detect drop out is less than 6 ms.
Jumper S11 − Turnaround Squelch Time
8 ms (default)
159 ms
Settings:
Jumper S11 is used with the call turnaround squelch option (jumper
S4). The available times are 8 ms (default) and 159 ms.
Page 17
Installation
Jumper S12 − Soft Carrier Turn Off
None
Settings:
8 ms (default)
26 ms
Jumper S12 configures the modem to either turn off the transmitter
immediately upon release of Request To Send, or send a Soft Carrier
Turn Off signal of 900 Hz for 8 or 26 ms at the end of each
transmission.
Jumper S13 − Anti-Streaming
None (default)
4 seconds
Settings:
7.6 seconds
14 seconds
28 seconds
56 seconds
Jumper S13 lets you select an anti-streaming time or use no anti-
streaming at all. Anti-streaming is typically used in multi-point
applications to prevent a malfunctioning slave from occupying the line
indefinitely.
When anti-streaming is active, the modem can only transmit data for up
to 56 seconds. Thereafter, the modem’s transmitter is automatically
turned off. The modem then looks for an ON-to-OFF transition of
Request To Send (RTS) before proceeding with normal operation.
Page 18
Connecting a DTE
Jumpers S14 and S15 − Self Test or Test Pattern
1 bps
Settings:
18 bps (default)
37 bps
75 bps
150 bps
Jumpers S14 and S15 configures the modem for Self Test or Test
Pattern. When the modem is in local Self Test or Test Pattern mode, it
generates a dot test pattern. The supported baud rates are 1 bps, 18 bps,
37 bps, 75 bps, or 150 bps.
Connecting a DTE
The modem back panel provides a standard, 25-pin port labeled DTE,
which connects to an RS-232 device. The connectors for this port
conform to the pin assignments shown under “DTE Connector – EIA
RS-232-C” on page 29.
The DTE should have a cable no longer than 50 feet, with a Cinch or
Cannon plug per DB-19604-432 plus a DB-51225-1 hood or
equivalent.
Connecting to a Private Line
Communication Circuit
The modem back panel provides an 8-pin RJ-45 connector labeled
TELCO, which connects to a private line communication circuit. The
connectors for this port conform to the pin assignments shown under
“Telco Connector” on page 29.
Connecting to an AC Power Source
The modem back panel provides an AC line cord. If the chassis ground
is connected through the third prong of the AC power plug, a separate
chassis ground wire is required.
Page 19
Installation
Powering-on the Modem
To supply power to the modem, place the POWER ON switch on the
modem back panel to the ON position. The PWR LED on the front
panel goes ON.
Powering-off the Modem
To turn off power to the modem, place the POWER ON switch on the
modem back panel to the OFF position. The PWR LED on the front
panel goes OFF.
Page 20
Chapter 3
LEDs and Controls
his chapter describes the LEDs and controls on the modem.
Front Panel LEDs
T
Table 3-1 describes the LEDs on the modem front panel.
Table 3-1. Front Panel LEDs
LED
PWR
TM
Status
ON = power is being supplied to the modem.
ON = the rotary switch is turned to Analog or Digital
Loopback, or the switch is in the Test Pattern transmit
mode or Self Test mode and no error is detected.
ON = the modem is detecting a valid carrier.
CD
RD
ON = data is being received or receive data line is in a
space condition.
ON = the Request-to-Send line from the DTE is ON.
ON = the Clear-to-Send line from the modem is ON.
RS
CS
TD
ON = data to be transmitted is being furnished to the
modem.
Page 21
Troubleshooting
Front Panel Test Switch
The modem front panel has a five-position rotary switch that lets you
select the modem’s operating mode. The five switch positions are:
™
™
DATA use this position for normal data transmissions.
AL (Analog Loopback) this position prepares the modem for
testing by the local terminal device. The transmitter output of the
modem is disconnected from the output coupling transformer and
connected to the modem receiver input. See Figure 3-1.
™
™
DL (Digital Loopback) this position configures the modem to
loop back received data to the transmitter and transmit the data to
the remote end. The RS-232-C interface to the terminal is not
active during this test. See Figure 3-2.
ST (Self Test) this position inhibits the modem from
transmitting and receiving data on the COMM LINE. The RS-232-
C interface to the terminal is not active during this test. See Figure
3-3.
The test pattern (dot pattern) passes through the transmitter, loops
back into the receiver, is demodulated, and is checked for errors. If
errors occur, the TM LED turns OFF and remains OFF for a period
of time that depends on the pattern generator baud rate.
In Analog Loopback and Self Test modes, the received analog data
is buffered, amplified by 16 dB (if output level is set to 0 dB), and
routed out on the transmit analog pair.
™
TTP (Transmit Test Pattern) this setting forces the transmitter
on and transmits data from the test generator to the COMM LINE.
The RS-232-C interface lines (RTS, CTS, and Transmit Data) to
the transmitter are not active. See Figure 3-4.
The TM LED goes ON when the receive data is good. If there are
errors, or if the received data does not compare with the
transmitted data, the TM LED goes off. The RS-232-C interface
lines to the receiver are active during this mode.
Page 22
Front Panel Test Switch
Figure 3-1. Analog Loopback Test
Local Modem
Analog LoopBack Mode
Remote Modem
Data Mode
RXD
RECEIVER
TRANSMITTER
Amplifier
DTE
DTE
PAD
TXD
TRANSMITTER
RECEIVER
4-Wire Telephone Line
t
Local Modem
Local Digital LoopBack Mode
Remote Modem
Data Mode
RECEIVER
TRANSMITTER
DTE
DTE
TRANSMITTER
RECEIVER
4-Wire Telephone Line
Figure 3-2. Digital Loopback Test
Page 23
Troubleshooting
Modem
Self Test Mode
TEST PATTERN
ERROR CHECK
TRANSMITTER
TX
RX
PAD
DTE
Amplifier
RECEIVER
TM
4-Wire Telephone Line
Figure 3-3. Self Test
Remote Modem
Receive Test Pattern Mode
Local Modem
TM
Send Test Pattern Mode
SPEED SELECT
TEST
PATTERN
ERROR
RECEIVER
DTE
TRANSMITTER
DTE
CHECK
2-Wire Telephone Line
Figure 3-4. Transmit Test Pattern
Page 24
Chapter 4
Troubleshooting
his chapter describes troubleshooting procedures you can use in the
unlikely event you encounter a problem with your modem.
T
Local Modem Test
The local modem test verifies the local modem’s transmitter, receiver,
and connection to the locally attached DTE. This test can be run either
by generating a data pattern from the locally attached DTE or by having
the modem generate a test pattern.
The following procedure describes how to run the local modem test
using a locally attached DTE to generate a data pattern.
1. Using the front panel test switch, place the modem in Analog
Loopback mode.
2. Turn on the Request To Send line.
3. Use the locally attached DTE to transmit the data pattern and check
for data errors on the Receive Data line.
The following procedure describes how to run the local modem test
using the modem test pattern instead of a data pattern originated by the
local DTE.
1. Using the front panel test switch, place the modem in Self Test
mode.
2. The TM indicator should turn ON. If the indicator turns OFF or
flashes, errors are occurring.
Page 25
Specifications
Line and Modem Test
The line and modem test verifies the local modem, the remote modem,
and the communications line between them. With this test, the local
modem loops back received data to the transmitter and transmits the
data to the remote modem. These characters can originate either from a
locally attached DTE or by having the modem generate a test pattern.
The following procedure describes how to run the line and modem test
using a locally attached DTE to generate a data pattern.
1.
2.
Place the remote modem in Digital Loopback mode.
Place the local modem in Data mode and transmit a data pattern.
Check for data errors on the Receive Data line
The following procedure describes how to run the line and modem test
using the modem test pattern instead of a data pattern originated by the
local DTE.
1.
2.
Place the remote modem in Remote Test mode.
Place the local modem in Remote Self Test mode. The TM LED
should turn ON and remain ON if the data is error free.
Page 26
Chapter 5
Specifications
his chapter lists the specifications for the modem.
General
T
2-wire half-duplex or 4-wire full-duplex
private line operation.
Operation:
0-1200 bps asynchronous on worst case
line. 0-1800 asynchronous on C2
conditioned line
Data rate:
Phase coherent. Frequency Shift Keyed
(FSK)
Modulation:
Carrier frequencies:
Line impedance:
Mark 1200 Hz 1%
Space 2200 Hz 1%
600 ohms 10% transformer coupled and
transient protected.
Selectable from 0 to –14 dBm, in 2 dB
steps.
Transmitter output
level:
8, 33, 59, or 219 ms
RTS-CTS delay:
Carrier Detect delay:
Digital interface:
Package:
6 or 23 ms OFF-to-ON, 6 On-to-OFF
EIA RS-232-C and CCITT V.24.
Standalone, UL approved.
8 ms or 159 ms
Turnaround squelch:
Anti-streaming:
Option to turn transmitter OFF after
selected time, even if RTS is ON
Page 27
Specifications
Test features:
Self Test, Analog Loopback, Digital
Loopback, and Test Pattern Transmit
Dimensions and Weight
Width:
Length:
Height:
7.00 inches (17.8 cm)
9.60 inches (24.4 cm)
2.25 inches (5.7 cm)
Temperature Range
Operating:
Storage:
-40 to +85 degrees Celsius
-40 to +85 degrees Celsius
Humidity range:95% relative, non-condensing
Power Requirements
™
™
™
115 VAC + or – 10%: 50/60 Hz
230 VAC + or – 10%: 50/60 Hz
12 to 60 VDC
For applicable models.
Page 28
Interface Pin Assignments
Interface Pin Assignments
DTE Connector - EIA RS-232-C
Pin
1
RS-232C Circuit
CCITT V.24 Circuit
Function
AA
BA
BB
CA
CB
CC
AB
CF
101
103
104
105
106
107
102
109
Protective Ground
Transmitter Data
Receive Data
2
3
4
Request to Send
Clear to Send
5
6
Data Set Ready
Signal Ground
7
8
Data Carrier Detect
+12 Volts Test Only
-12 Volts Test Only
Analog Loopback
9
10
25
All interfaces on the RS-232-C digital connector conform to
the requirements of EIA-RS-232-C.
Note:
Telco Connector
Pin
Description
4, 5
2-wire mode: transmit/receive pair.
4-wire mode: transmit pair.
3, 6
Receive pair for 4-wire mode.
Polarity of transmit pair or receive pair is not significant. Remaining
pins are not used.
Page 29
Specifications
NOTES
Page 30
Appendix A
Compliances
FCC Rule
This device complies with Part 15A of the FCC Rules. Operation is subject to
the following two conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
This equipment has been tested and found to comply with the limits for a Class
A digital device, pursuant to Part 15A of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or more of
the following measures:
™
™
™
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and the receiver.
Connect the equipment to an outlet on a circuit other than the one to
which the receiver is connected.
™
Consult the dealer or an experienced radio/TV technician for help.
If none of these actions resolves the problem, consult your distributor or an
experienced radio/television technician for additional suggestions.
Additionally, Section 15.838, paragraph d), of the FCC Rules and Regulations
states: “Where special accessories, such as shielded cables, are required in
order to meet FCC regulations, shielded cables must be used with this
equipment. Operation with non-approved equipment or unshielded cables is
likely to result in interference to radio and TV reception. The user is cautioned
that changes and modifications to this equipment without the approval of the
manufacturer could void the user’s authority to operate this equipment.
Page 31
Compliances
Department of Canada Statement
This Class A digital apparatus meets all requirements of the Canadian
Interference-Causing Equipment Regulations.
Cet appareil numerique de la classe A respecte toutes les exigences du
Reglement sur le materiel brouilleur du Canada.
Page 32
Appendix B
Limited Product
Warranty
Telenetics warrants that the Product sold will be free from defects in
material and workmanship and perform to Telenetics' applicable
published specifications for a period of 18 months from the date of
delivery to Customer or 12 months from placement into service,
whichever occurs first. The liability of Telenetics hereunder shall be
limited to replacing or repairing, at its option, any defective Products
which are returned F.O.B., Telenetics' facility, Lake Forest, California
(or, at Telenetics' option refunding the purchase price of such products).
In no case are Products to be returned without first obtaining permission
and a customer return order number from Telenetics. In no event shall
Telenetics be liable for any consequential or incidental damages.
Products which have been subject to abuse, misuse, accident, alteration,
neglect, unauthorized repair or installation are not covered by the
warranty. Telenetics shall make the final determination as to the
existence and cause of any alleged defect. No liability is assumed for
expendable items such as lamps and fuses. No warranty is made with
respect to custom products or Products produced to Customer's
specifications except as specifically stated in writing by Telenetics in the
agreement for such custom products.
This warranty is the only warranty made by Telenetics with respect to
the goods delivered hereunder, and may be modified or amended only by
a written instrument signed by a duly authorized officer or Telenetics
and accepted by Customer.
This warranty and limitation extends to customer and to users of the
product and is in lieu of all warranties with respect to the product
whether express, implied, or statutory, including without limitation the
implied warranties of merchantability and fitness for a particular
purpose.
Page 33
Limited Product Warranty
NOTES
Page 34
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