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2 or 4 Channel RS-232 Sync-over-T1/E1 Multiplexer

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The TC8631-4 is a 2 or 4 Channel RS-232 Sync-over-T1/E1 central directional multiplexer with built-in power redundancy, ideal for applications where RS-232 Sync serial data needs to be extended over a T1/E1 link.

Using two DB9 female ports (Port 1 & Port 2) for RS-232 Sync signals and each channel supports up to 28.8 Kbps.

With two TC8631-4 cards in one 1U chassis, there are two T1/E1 connections available for following configurations:

  • Two 2 channel serial RS-232 multiplexer, each having their own T1/E1 connection
  • One 4 channel serial RS-232 multiplexer, T1/E1 primary link and T1/E1 secondary link

Features 3 different types of built-in loopbacks: local, remote, and T1/E1 loopback, assist in isolating whether an issue lies on your serial line or your T1/E1 line. CSU Loop Code Up/Down is also supported.

  • 2 CH or 4 CH RS-232 Sync with Full Handshakes (CTS/RTS, DTR/DSR)
  • Built-in Internal Clocks (TXC/RXC)
  • RS-232 Status LEDs for 8 Signals: TXD/RXD, CTS/RTS, DTR/DSR, TXC/RXC
  • Seven LEDs for T1/E1 Status BPV, LOS, SYNC, AMI, RAI, AIS, CRC
  • ESF Framing Support for T1
  • PCM31C Framing Support for E1
  • Very Low Latency
  • Optional Power Redundancy
  • 1U or 4U Rack Mount
  • 12VDC, 24VDC, -48VDC, 125VDC, 100-240VAC
  • “R2” Push Button for Troubleshooting Local Or Remote Units


The TC8631-4 2-Channel RS-232 Sync-over- T1/E1 multiplexer provides an inexpensive method for connecting terminals such as relays, and status collecting devices. It is also used in harsh environments where EMI/ RFI interference, ground loops and lightning conditions may exist.

TC8631-4 - RS-232 Sync-over-T1/E1 Multiplexer
Click to enlarge


  1. StandardRS-232s
  2. Ports2
  3. Data Rate9.6 Kbps, 14.4 Kbps, 19.2 Kbps, 28.8 Kbps
  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
Visual Indicators
  1. Channel Status (each ch.)TXC, RXC, TXD, RXD, CTS, RTS, DTR, DSR
  2. SystemPWR A, PWR B, Vcc, ALM, RMT
  1. ConnectorDB9F
  2. InterfaceRS-232
  1. Bit Error Rate1 in 109 or Better
  1. Dry ContactNormal Open/Closed
  1. Standard12VDC @ 500mA
  2. Optional24VDC, -48VDC, 125VDC, or 100/240VAC (with 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
  1. Single Card
  2. Height(3.53 cm) 1.40"
  3. Width(18.14 cm) 7.20"
  4. Depth(24.89 cm) 9.80"
  5. Weight(907 gm) 2.0 lbs
  1. 1U Chassis
  2. Height(4.3 cm) 1.70"
  3. Width(48.3 cm) 19.0"
  4. Depth(26.7 cm) 10.5"
* Contact factory for higher requirements


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