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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 or 1S Standalone Chassis
  • 12VDC, 24VDC, -48VDC, 125VDC
  • “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
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  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 115/230VAC (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
Physical (Standalone Unit)
  1. Height(3.53 cm) 1.40"
  2. Width(18.14 cm) 7.20"
  3. Depth(24.89 cm) 9.80"
  4. Weight(907 gm) 2.0 lbs
* Contact factory for higher requirements


For more information

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