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TC8618-1 and -2

4 Channel Voice-over-T1/E1 Multiplexer

TC8618-1 and -2
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The TC8618 is a 4-channel Voice/Fax/Modem over T1/E1 Multiplexer that allows network managers the flexibility of leveraging T1/ E1 circuits by adding low cost analog as needed.

Dialing and paging between TC8618-1 (FXS) units is supported, providing customers flexibility for voice calls. The device is economical, simple to install and comes standard with built-in power redundancy.

The TC8618 is available in two configurations:

  • 4-Channel FXS (TC8618-1)
  • 4-Channel FXO (TC8618-2)
  • 4-ch. FXS (TC8618-1) or 4-ch. FXO (TC8618-2)
  • Mux 4 ch. 2-Wire Telephone/Fax/Modem over T1/E1
  • ESF Framing Support for T1
  • PCM31C Framing Support for E1
  • Dialing/Paging between FXS (TC8618-1) units
  • Diagnostic Feature CSU Loop Up/Down Code Supported
  • Very Low Latency
  • Built-in Power Redundancy
  • Rack Mount or Stand Alone


A low cost and immediate solution, the TC8618 is typically used to link analog telephones or legacy dial-up devices including data modems, fax machines, meters, ATM, and credit card machines over T1/E1.

TC8618-1/-2 - Typical Use Application Application
Click to enlarge

Dialing/Paging is also available in FXS to FXS applications

TC8618-1 and -2 - Voice-over-T1/E1 Multiplexer
Click to enlarge


  1. TC8618-14x FXS
  2. TC8618-24x FXO
Connection Capacity
  1. 600 ohm (2-Wire)4 Ports
  1. T1
  2. StandardG.703
  3. Impedance100Ω
  4. Receiver sensitivity0dB to -36dB
  5. Line CodeAMI / B8ZS
  6. FramingESF (Only)
  7. E1
  8. StandardG.703
  9. Impedance120Ω or 75Ω with BNC adapter
  10. Receiver sensitivity0dB to -43dB
  11. Line CodeAMI / HDB3
  12. FramingPCM31C
  1. Analog interface Impedance600Ω
  2. Max Input3Vp-p
  3. Frequency band300 to 3400Hz
  4. ConnectorRJ-11
Visual Indicators
  1. Channel StatusRing, Hook
  2. SystemPWR A, PWR B, Vcc, ALM, RMT
  1. Bit Error Rate1 in 109 or better
  1. Dry ContactNormal Open/Closed
  1. Standard12VDC@ 1A (12W) for TC8618-1
  2. Standard12VDC@500mA (6W) for TC8618-2
  3. 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


For more information

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