202T Leased Line Modem rack card

202T Leased Line Modem rack card

In stock
  • Full duplex to 1200 bps
  • Asynchronous RS-232
  • 4-wire, full duplex or 2-wire, half-duplex line application
  • 900 Hz soft carrier turn off
  • Anti-streaming
  • Standalone or rack mount
  • High stability transmit and receive frequency
  • Ruggedized for full temperature range
  • Quiet multi-layer board
  • Fully compatible with other 202T's


The 202T modem operates at 0 to1200 bps asynchronous, with FSK modulation. It uses the latest DSP modem circuitry to insure excellent performance and future availability. It has 900 hz soft carrier turn off for multidrop and an anti-streaming option. 7.25" half card size, standalone and custom OEM board configurations are available. The pc card version uses the internal PC ISA bus only for power from the pc bus. The PC card fits into a 20 slot rack mount chassis that is only 7" high. The phone line connector is an RJ-11 for 4-wire leased line operation or 2-wire half duplex leased line operation. Transmit is on positions 2 and 3, receive 1 and 4 of the 4 position RJ-11connector for 4-wire, on positions 2&3 for two wire. The modem has a push/push switch for local digital loop on or off. The loopback switch is located on the rear of the unit, next to the DB-25 terminal connector.

  • Analog full duplex, 4-wire, 600 ohm balanced, Frequency Shift Keying
  • Analog half duplex, 2-wire, 600 ohm balanced, Frequency Shift keying
  • Mark-1200 hertz, Space-2200 hertz, Speed 0 to 1200 bps
  • 900 Hertz Soft Carrier Turn Off for multidrop operation
  • Transmit level control 0 dBm or -16 dBm
  • Receive level 0 dBm to -42 dBm
  • Carrier Turn-on time less than 12 msec
  • Will drive up to 30 Km of cable depending upon wire gauge
  • Switched carrier or constant carrier operation (RTS forced on or terminal controlled)
Digital Interface
  • RS-232, DB-25S
  • Signals are Tx, Rx, RTS, CTS, DSR, DCD
  • RTS/CTS delay is 12 or 20 ms in switched carrier mode or RTS can be forced on
  • Rx data is clamped to mark when no receive carrier detect is present.
  • 202T Modem - FSK Analog Modem, Async
Controls and Indicators
  • Power, Tx Data, Rx Data, RTS, CTS, DCD, Test
  • Digital loop via rear panel switch and front DIP switch
  • Controlled carrier (with RTS/CTS delay) or constant carrier with RTS/CTS on
  • anti-streaming option (8 seconds), Loopback or normal operation
  • Transmit level - 0 db or -16db, 900 Hz Soft Carrier turn off On or Off
Physical and Electrical
  • -40C to +70C operating temperature range, PC ISA bus format or standalone version,
  • PC bus for power and ground only, standalone unit uses 110V wall mount supply
  • Half size PC card, 7.25"D x 4.25"H
  • Stand alone: 5.5" W x 7.375"D x 1.5" high, 110VAC wall mount supply (9VDC, 500 ma)
  • Other DC power supply voltages, 12, 24, -48, 125 VDC, 220VAC available on special order
  • A 1.5" x 19" fixture available to rackmount up to 3 standalones in a single 1U height
  • 20 slot rack chassis on slide guides is 19"W x 16"D x 7"H, 110VAC 250 W power supply
Switch Name DOWN UP
1 Reset Off Toggle Up/Down
2 Anti-streaming Off On
3 RTS/CTS delay 12 ms 20 ms
4 RTS control Forced on Controlled by Terminal
5 Soft Carrier Turnoff Off On
6 Reserved - -
7 Transmit Level -16 dB 0 dB
8 Loopback Loopback Active Loopback Off

Standalone rack fixture - 18.95" x 7" (4U)
Single Unit Rack Mounts (1U)

202T-SA 202T Modem - Standalone w/ 110VAC wall mount supply
202T-R 202T Modem - Rackmount
DCBL1 20 Slot Rack w/ power supply
9902096 19" Rack Bezel 1 unit wide
9902095 19" Rack Shelf 3 units wide
202T-12VDC 9-18 VDC input internal power supply option
202T-24VDC 18-36 VDC input internal power supply option
202T-48VDC 36-72 VDC input internal power supply option
202T-125VDC 125 VDC input external power supply option
More Information
Manufacturer DCB
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