Telenetics MOT202T - 202 Modem


Born-Again UDS/Motorola 202 modem
2 or 4 lease line 202T modem
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 125VDC) and -40ºC to +80ºC operating range capabilities. 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.
  • 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 on stand alone modems
  • 115VAC, 60Hz - 220/240VAC 50 Hz power (Standalone)
  • Rack modems - racks are available in AC and DC versions
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.
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 Transmit
Space: 2200 Hz
Mark: 1200 Hz
Soft Carrier: 900 Hz
Timings All settings and timings are controlled by jumpers on the modem board.
Anti-streaming Option to turn transmitter OFF after a selected time, even if Request To Send is ON
Test Features The modem employs a rotary switch that selects these test options:
  • Data Mode
  • Self Test
  • Analog Loop Back
  • Digital Loop Back
  • Test Pattern Transmit
    Indicators The modem has LED indicators for the following interface circuits:
    RTS, CTS, DCD, RD, TD, TM (Test Mode) and PWR.
    Receiver Center Frequency Tolerance 1700 Hz ± 16 Hz
    Receiver Performance The modem receiver will operate with the following performance at 3002/C2 or M1025 lines

    1200Bps: B.E.R. equal to 1 x 10-5 with 12 db signal to noise ratio

    1800Bps: B.E.R. equal to 1 x 10-5 with 18 db signal to noise ratio
    Carrier Detect Threshold The received carrier detect threshold can be configured by the on-board jumper.
    With jumper on:  
    DCD off Þ on Carrier stronger than Ð30 dBm
    DCD off Þ on Carrier stronger than Ð45 dBm
    Hysteresis: Approximately 2 dB
    Receiver Dynamic Range 0 dBm to Ð 43 dBm
    Transmit Frequency Tolerances Space Frequency: ± 0.1%
    Mark Frequency: ± 0.1%
    Soft Carrier Frequency: ± 0.1%
    Transmit Levels The modem transmit level is selectable from 0 dBm to Ð 14 dBm in 2 dB steps by the on-board jumper S2- 1 to 8.
    Rack & Standalone
    AC Power 20 VAC RMS @ 150 mA, center tapped
    10 VAC RMS @ 225 mA
    115 VAC & 220/240 VAC
    DC Power +15 VDC referred to gnd.
    -15 VDC referred to gnd.
    +8.5 VDC referred to gnd.
    Operating Temperature -40 to +85 degrees C
    Storage Temperature -40 to +85 degrees C
    Relative Humidity 95%, non-condensing
    Analog Line Edge Connector An 8-pin edge connector located at 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.
    Signal Name
    Receive Line for four wire systems
    Transmit/Receive Line for two wire systems
    Transmit/Receive Line for two wire systems
    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.
    Modem Board Selective Jumper Options
    Operational Settings
    Data Carrier Detect Level:
    -30 dBm
    - 45 dBm
    Transmit Level:
    0 dBm
    - 2dBm
    - 4dBm
    - 6dBm
    - 8dBm
    - 10dBm
    - 12dBm
    - 14dBm
    Line Connection:
    2- wire
    Turnaround Switch:
    Transmit Carrier:
    RTS Control
    Constant Carrier
    Local Copy Squelch:
    No Local Copy
    Local Copy
    Test Generator Baud Rate:
    Chassis GND Option:
    Chassis GND and Signal GND not connected
    Chassis GND and Signal GND connected together
    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
    PDF sheet for more specifications
    Ordering Information
    MOT202TSA Bell 202T, 1800 bps Standalone Modem
    MOT202TSADC Bell 202T, 1800 bps, 5-60 VDC low voltage modem
    MOT202TRM Bell 202T, 1800 bps Rackmount Modem (RM16 Nest)
    MOT-202T-RMPNL Front Panel Kit for MOT-202T
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