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8 or 16 Channel 600 Ohm Analog & Dry Contact-over-T1/E1 Multiplexer

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The TC8624 is part of the Mini Channel Bank series of products from TC Communications. As with all products in the series, the TC8624 is designed to be simple yet robust.

TC8624 is available in three configurations, each one contains 8 channel dry contact detectors, or 8 channel dry contact relays:

  • 8-channel 4-wire analog
  • 8-channel 2-wire analog
  • 4-channel 4-wire analog (Ports 1-4) and 4-channel 2-wire analog (Ports 5-8)
  • 8 CH or 16 CH 600 Ohm analog & Dry Contact or Closure Detect
  • Modular Design with 8 Channels per Module
  • 64K Full Bandwidth Voice Transport
  • Passes All Tones used for FSK, EIA Tone Control/Remote and Paging
  • Supports Pilot/Guard Tone Operation
  • 2-Wire or 4-Wire Analog
  • ESF Framing Support for T1
  • PCM31C Framing Support for E1
  • Diagnostic Feature CSU Loop Up/Down Code Supported
  • Local, Remote, and T1/E1 Loopback for diagnostics
  • Very Low Latency
  • Optional Power Redundancy
  • 1U or 4U Rack Mount or 1S Standalone Chassis
  • 12VDC, 24VDC, -48VDC, 125VDC
  • LEDs for analog volume, T1/E1 signal status and remote unit status
  • “R2” Push button for troubleshooting local or remote units

TC8624 is a modular card. It can be plugged into the following chassis’:

  • 1S: only one TC8624 card can be plugged in
  • 1U: up to two TC8624 cards can be plugged in to support 16 analog channels
  • 4U: up to eight TC8624 cards can be plugged in to support up to four remote locations with T1/E1 links

With two TC8624 cards in one 1U chassis, there are two T1/E1 connections available for following configurations:

  • Two 8 channel analog multiplexer, each having their own T1/E1 connection.
  • One 16 channel analog multiplexer, T1/E1 primary link and T1/E1 secondary link.


  • Radio Analog Voice Transmission
  • Data Modem Connection for SCADA Applications
  • Power Teleprotection Communications that requires low latency
  • Microwave with T1/E1 channels
  • Sonet/SDH with T1/E1 channels
  • Replace end of life T1/E1 channel banks
TC8624 - Block Diagram
Click to enlarge
TC8624 - 8 Channel Analog Dry Contact Over T1/E1 Multiplexer
Click to enlarge


Channel Options
  1. 8 CH 2-Wire with 8 CH Closure Detector
  2. 8 CH 2-Wire with 8 CH Relay
  3. 8 CH 4-Wire with 8 CH Closure Detector
  4. 8 CH 4-Wire with 8 CH Relay
  5. 4 CH 2-Wire + 4 CH 4-Wire with 8 CH Closure Detector
  6. 4 CH 2-Wire + 4 CH 4-Wire with 8 CH Relay

*16 Channels can be supported by combining units within the 1U chassis.

Connection Capacity (per interface card)
  1. 600 ohm (2/4 Wire)8 Ports
  2. Dry Contact8 Ports
  1. T1
  2. Receiver Sensitivity0dB to -36dB
  3. Line CodeAMI / B8ZS
  4. FramingESF (Only)
  5. E1
  6. Receiver Sensitivity0dB to -43dB
  7. Line CodeAMI / HDB3
  8. FramingPCM31C
  1. Dry Contact Interface
  2. Normal openstandard
  3. Normal closeoptional
  4. Load Voltage (peak AC)60V
  5. Load Voltage (DC)60V
  6. Continuous load current0.55A
  7. Peak load current1.2A
  8. Max On Resistance2.5 Ω
  9. Output Capacitance150pF
  10. Detector Max input voltage9V
  11. 600Ω analog interface
  12. Impedance600Ω
  13. Max Input3Vp-p
  14. Frequency band300 to 3400Hz
  15. Output Volume-10 dB
  16. Volume Detection Level (2-Wire)-36.5 dBm
Visual Indicators
  1. Channel Status (each ch.)TX/RX
  2. SystemPWR A, PWR B, Vcc, ALM, RMT
  3. T1/E1AMI, RAI, AIS, CRC, BPV, LOS, SYNC, In-Use
  1. Bit Error Rate1 in 109 or better

  1. Dry ContactNormal Open/Closed
  1. Standard12VDC @500mA MAX
  2. Optional24VDC, -48VDC, 125VDC, or 100-240VAC
  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 (1U Rackmount)
  1. Height(4.3cm) 1.7"
  2. Width(48.3cm) 19"
  3. Depth(26.7cm) 10.5"


For more information

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