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1U 4 Channel Serial over T1/E1 Multiplexer

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The TC8631-1 is a 4 Channel Serial-over-T1/E1 multiplexer with built-in power redundancy for 1U chassis.

TC8631-1 can support either T1 or E1 upon order. TC8631-1 can be used with either of the following 1U card cages:

  • TCRM199F-I: up to 2x TC8631-1 with separate T1/E1 connections
  • TCRM199F-R: up to 2x TC8631-1 over a single or redundant T1/E1 connection
  • 4 ch. RS-232 or 4 ch. RS-422/RS-485
  • 2-Wire or 4-Wire RS-485
  • ESF Framing Support for T1
  • PCM31C Framing Support for E1
  • Very Low Latency - 600µs
  • Individually Isolated Ground for each Serial Port
  • Supports 120Ω & 75Ω E1
  • Built-in Power Redundancy
  • Rack Mount or Stand Alone


The TC8631-1 offers an inexpensive, plug and play method for connecting up to four serial devices over existing T1/E1 links. Popular applications include:

  • Transport of asynchronous RS232/RS422/RS485
  • Transport of SCADA communications
  • Protocol-transparent
  • Supports SEL Mirrored Bits®**
  • Connecting two Power Utility teleprotection relays

The TC8631-1 can also convert the RS-232 Async to RS-422/RS-485 signals running from the local side to the remote side or vice-versa.

**NOTE - Mirrored Bits® is a registered trademark of Schweitzer Engineering Laboratories Inc.
TC8631-1 - 1U Serial over T1/E1 Multiplexer
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  1. StandardRS-232/RS-422/RS-485
  2. Ports4
  3. Data Rate
  4. RS-232 Async w/ ControlUp to 64 Kbps
  5. RS-422 AsyncUp to 64 Kbps
  6. RS-485 2 or 4-Wire4.8 Kbps, 9.6Kbps, 19.2Kbps, 38.4Kbps
  7. *Above data rate valid when used inTCRM199F-I

  1. StandardRS-232/RS-422/RS-485
  2. Ports8
  3. Data Rate
  4. RS-232 Async w/ ControlUp to 38.4 Kbps
  5. RS-422 AsyncUp to 38.4 Kbps
  6. RS-485 2 or 4-Wire4.8 Kbps, 9.6Kbps, 19.2Kbps, 38.4Kbps
  7. *Above data rate valid when used inTCRM199F-R

  1. T1
  2. Receiver Sensitivity0dB to -36dB
  3. Line CodeAMI / B8ZS
  4. FramingESF
  5. E1
  6. Receiver Sensitivity0dB to -43dB
  7. Line CodeAMI / HDB3
  8. FramingPCM31C
  1. ConnectorRJ11F
  2. Interface (standard)RS-232, RS-422, 2 or 4-wire RS-485
Visual Indicators
  1. Channel Status (each ch.)Tx, Rx
  2. SystemPWR A, PWR B, Vcc, ALM, RMT
  1. Bit Error Rate1 in 109 or better

  1. Dry ContactNormal Open/Closed
  1. Standard12VDC @300mA
  2. Optional24VDC, -48VDC, 125VDC, or 115/230VAC w/ power cube
  1. Operating-10°C to 50°C
  2. Hi-Temp (optional)-20°C to 70°C
  3. Extreme (optional)-40°C to 80°C
  4. Storage-40°C to 90°C
  5. Humidity95% non-condensing
Physical (Standalone Unit)
  1. Height(3.53cm) 1.40"
  2. Width(18.14cm) 7.20"
  3. Depth(24.89cm) 9.80"
  4. Weight(907g) 2.0lbs
*Contact factory for higher requirements/availability


For more information

Product version may differ from current manual. For assistance or proper manual version please contact Technical Support.