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4 Channel 600 ohm Analog & Dry Contact-over-T1/E1 Multiplexer

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The TC8614 is a 4-channel 600 ohm Analog & Dry Contact-over-T1/E1 Multiplexer that allows network managers the flexibility of leveraging their existing T1/E1 circuits by adding low cost analog or dry contact links as needed.

It is economical, simple to install and comes standard with built-in power redundancy. The TC8614 is available in three configurations:

  • 4-Channel 2-Wire Analog with 4-Channel Dry Contact
  • 4-Channel 4-Wire Analog with 4-Channel Dry Contact
  • 2-Channel 2-Wire/ 2-Channel 4-Wire Analog with 4-Channel Dry Contact
  • 4-ch. 600 ohm Analog & Dry Contact
  • 2-Wire or 4-Wire Analog
  • ESF Framing Support for T1
  • PCM31C Framing Support for E1
  • Diagnostic Feature CSU Loop Up/Down Code Supported
  • Very Low Latency
  • Dry contact detectors with Isolated Ground
  • Built-in Power Redundancy
  • Rack Mount or Stand Alone


A low cost and immediate solution, the TC8614 is typically used to link or extend various 600Ω analog, audio and intercom devices (e.g. FSK modems, E&M, teleprotection relay controllers, etc.) and dry contacts over existing T1/E1 links. It is also used as a backup network to ensure business continuity.

Here it is used to improve voice quality and increase system reliability in harsh environments, to replace unreliable leased phone circuits and to stabilize voice level settings for 600 ohm audio channels.

TC8614 - Leased Phone Circuit Replacement Application
Click to enlarge

The TC8614 is also ideal for replacing channel banks where only a few channels are needed. A simpler, more efficient solution to strengthen your network. This 600Ω Analog over T1/E1 solution eliminates complicated setup and management and includes up to 4-ch Dry Contact (PTT/COR compatible).

TC8614 - Analog Dry Contact Over T1/E1 Multiplexer
Click to enlarge


Connection Capacity
  1. 600 ohm (2/4 Wire)4 Ports
  2. Dry Contact4 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
Visual Indicators
  1. Channel Status (each ch.)TX/RX or RLY/DET
  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.