Telenetics MOT202T User Manual

Modems

Modems

MOT202T

“Born-Again”
UDS/Motorola 202T

▲ 2-wire half duplex or 4-wire full duplex

private line operation

▲ 0 to 1200 bps data rate over unconditional

lines and 1800 over high quality lines

▲ Anti-streaming
▲ Phase coherent, frequency shift keyed

(FSK) modulation

▲ LED indicators
▲ Front panel rotary switch function selector
▲ Integral test features
▲ 12, 24, 48, 125VDC Power (Rack)
▲ 115VAC, 60Hz - 220/240VAC 50 Hz

power (Standalone)

Introducing the latest addition to the Telenetics
family of industrial grade, temperature hardened
modems, the MOT202T is a pin-for-pin, form, fit
and function replacement for the Motorola/UDS
Model RM16M202T.

A must for industrial applications, the MOT202T
(Standalone) features built-in diagnostic, anti­streaming, multi-power inputs (115 to 240AC, 12 to

º

125VDC) and -40

The modem operates over leased or dedicated, loaded
or unloaded lines equal to or better than the ITU
(formerly CCITT) M.1020/1025 or the BELL 3002 leased
line services. It operates over point-to-point or
multi-point polled systems and operates in full or
half-duplex over 4-wire or 2-wire circuits.

C to +80ºC operating range capabilities.

®

The modem employs circuitry to prevent data and carrier detect errors over noisy lines. In multi-drop systems
it is very common to have noise spikes and other harmful high frequency components caused by carrier turn-offs
from other modems on the same line. The modem uses a combination of soft-carrier generation and soft-carrier
detection in conjunction with a signal to noise ratio (SNR) detector to eliminate errors caused by line noise.

The MOT202T’s anti-streaming capability prevents a modem from remaining in the transmit mode when the modem is
not actively transmitting date. In addition, the MOT202T allows users to verify transmitted and received data
via the diagnostic feature.

The MOT202T interchangeable design between the Universal Data Shelf multiple modem enclosure (RM16M series)
and the standalone modem enclosure, enables the modem to be directly inserted in the Universal Data Shelf when
the optional front panel is attached. Thus, data-communications facility can easily upgrade from front
multiple standalone enclosures to a centralized rack without the expense and trouble of purchasing new modems.

25111 Arctic Ocean Drive
Lake Forest, CA 92630
tel. [phone] fax. [phone]
www.telenetics.com

Specifications*

FUNCTIONAL DESCRIPTION

General

Data Rate From 0 to 1800 bps (baud) depending

on transmission facility

Modulation Phase-coherent Frequency shift keying

(FSK).

Line Impedance 600 ohms ± 10 %, transformer coupled

and transient protected

Operation The modem operates at full duplex or

half duplex over four-wire lines, or
half-duplex only over two-wire lines.
It operates asynchronously.

Receive and Space: 2200 Hz
Transmit
Frequencies

Timings All settings and timings are

Anti-streaming Option to turn transmitter OFF after a

Test Features The modem employs a rotary switch

Indicators The modem has LED indicators for the

Receiver

Receiver Center 1700Hz ± 16 Hz
Frequency Tolerance

Receiver Performance The modem receiver will operate with

1200Bps: B.E.R. equal to 1 x 10

1800Bps: B.E.R. equal to 1 x 10-5with 18 db

Carrier Detect The received carrier detect threshold can
Threshold

With jumper option:

DCD off ➞ on Carrier stronger than –30 dBm

OORR

DCD off ➞ on Carrier stronger than –45 dBm
Hysteresis: Approximately 2 dB

Receiver Dynamic 0 dBm to – 43 dBm
Range

Mark: 1200 Hz
Soft carrier: 900 Hz

controlled by jumpers on the modem
board.

selected time, even if Request To Send
is ON

that selects these test options:

• Data Mode

• Self Test

• Analog Loop back

• Digital Loop back

• Test Pattern Transmit

following interface circuits:
RTS, CTS, DCD, RD, TD, TM (Test Mode)

and PWR.

the following performance at 3002/C2 or
M1025 lines

-5

with 12 db

signal to noise ratio

signal to noise ratio

be configured by the on-board jumper.

Transmitter

Transmit FrequencySpace frequency: ± 0.1 %
Tolerances

Mark frequency: ± 0.1 %
Soft Carrier frequency: ± 0.1 %

Transmit Levels The modem transmit level is

selectable from 0 dBm to – 14 dBm in
2 dB steps by the on-board jumper S2­1 to 8.

POWER REQUIREMENTS

Rack & Standalone

AC Power 20 VAC RMS @ 150 mA, centertapped.

10 VAC RMS @ 225 mA.
115VAC & 220/240VAC

DC Power +15 VDC referred to gnd

-15 VDC referred to gnd.
+8.5 VDC referred to gnd.

ENVIRONMENTAL SPECIFICATIONS

Operating Temperature -40 to + 85 degrees C
Storage Temperature -40 to + 85 degrees C
Relative Humidity 95%, non-condensing

INTERFACE SPECIFICATIONS

Analog Line edge An 8-pin edge connector located at

connector

Pin Signal Name Function

3 DTR Receive Line for four wire systems
4 DTX Transmit/Receive Line for two wire systems
5 DRX Transmit/Receive Line for two wire systems
6 DRR Receive Line for four wire systems

The maximum data rate for this modem is:

▲ 0 to 1200 bps (baud) over ITU M.1025 or

BELL 3002 Basic services.

▲ 0 to 1800 bps (baud) over ITU M.1020 or

BELL 3002 C2 conditioned lines.

Interface Compatibility

▲ The modem’s line interface is compatible

with the Bell Systems/WE 202 specifications
and with the ITU V.23 recommendation.

▲ The modem’s data interface is compatible

with the RS 232C specifications and with
the ITU V.24/28 recommendations.

the backend of the modem board. The
four signals routed to and from this
connector are the analog transmit and
receive pairs. Each pair are fully
differential signals.

Document #0071 0700

Telenetics is registered trademark of Telenetics Corporation.

All other trademarks are the property of their respective holders. ©2000

25111 Arctic Ocean Drive
Lake Forest, CA 92630
tel. [phone] fax. [phone]
www.telenetics.com

Power edge A 12-pin edge connector located at the

connector

left side of the modem board. This
connector supplies the modem board with
power from the standalone case or the
modem rack. Header H1 is located on top
of P1.

Pin Voltage Function Header H1 Pin

10 + 15 VDC Transformer 20 VAC 2
12 - 15 VDC Transformer 20 VAC 1
8 Center Tap Transformer center tap 3 & 4
4 + 8.5 VDC Transformer 10 VAC 6
6 + 8.5 VDC Transformer 10 VAC 5
2 GND Chassis Ground n.c.

Modem Board Selective Jumper Options

Operational Settings

Data Carrier Detect Level

- 30 dBm

- 45 dBm

Transmit Level

0 dBm

- 2 dBm

- 4 dBm

- 6 dBm

- 8 dBm

- 10 dBm

- 12 dBm

- 14 dBm

Line Connection

2- wire
4- wire

Turnaround Squelch

In
Out

Transmit Carrier

RTS Control
Constant Carrier

Local Copy Squelch

No Local Copy
Local Copy

Test Generator Baud rate

1
18
37
75
150

Chassis GND Option

Chassis GND and Signal GND not connected
Chassis GND and Signal GND connected together

Digital Data edge P2 is a 25-pin edge connector located at
connector

Pin RS 232 V.24 Function

1 AA 101 Protective Ground
2 BA 103 Transmitted Data
3 BB 104 Received Data
4 CA 105 Request To Send
5 CB 106 Clear To Send
6 CC 107 Data Set Ready
7 AB 102 Signal Ground
8 CF 109 Data Carrier Detect
9 ---- ---- + 12 Volt.Test only
10 ---- ---- - 12 Volt.Test only
25 ---- ---- Analog Loop back

the backend of the modem board. The eleven
signals routed to and from this connector
are the RS 232 data interface signals.

circuit circuit

Modem Timing

RTS/CTS Delay

8 ms
33 ms
59 ms
219 ms

Data Carrier Detect Delay

6 ms
23 ms

Turnaround Squelch Time

83 ms

159.6 ms

Soft Carrier Timing

No Soft Carrier

8.3 ms

26.6 ms

Anti-Streaming Time

4 ms

7.6 ms
14 ms
28 ms
56 ms
Out

*Specifications are subject to change without notice

For more information on Telenetics’ wireless
products and services, call:

949-455-4000 or visit
www.telenetics.com

Telenetics is registered trademark of Telenetics Corporation.

All other trademarks are the property of their respective holders. ©2000

Document #0071 0700