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Async RS-232 Telephone Extender

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Compatible with PBXs & Key Systems, the TC1900 "Quick-Talk" Phone Extender extends voice over Async RS-232 into a voice network by plugging in an analog telephone.

The TC1900 "Quick-Talk" RS232 Phone Extender extends dial-up phone service to remote sites over Async RS-232. Compatible with most PBXs or Key Systems, it provides 2-wire FXS on the telephone side with ring down capability and FXO on the PBX side.

  • Extend Telephone Link with Async RS-232
  • 19.2k, 38.4k, 48k Async Baud Rates
  • PBX and Key System Compatible, FXO/FXS Selectable
  • Voice Bandwidth from 300Hz to 3.4Khz for Toll Quality Sound
  • Built-In Dry Contact Relay for External Alarm and Ringer Connection
  • 12VDC Power Supply, Optional 24VDC, -48VDC, 125VDC or 115/230VAC with Power Adapter
  • Built-In Power Redundancy
  • Rackmount or Standalone
  • Tested and Compatible with:
    code blue ramtel talk a phone


The TC1900 is often used to extend telephone service in campus networks, power plants, substations, etc or use an existing service data channel to set up a telephone link. It is also used to set up “hot” telephone service via existing RS-232 links on satellite or microwave networks.
TC1900 - Async RS-232 Telephone Extender
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Audio Bandwidth
  1. Frequency300Hz to 3.4Khz
  1. Phone ConnectorRJ11 Female
  2. Ring Voltage70Vrms at 20Hz (Depending on the ringing load)
  3. FXO Input Impedance600 Ω
  4. FXS Output Impedance600 Ω
  5. RS-232 ConnectorRJ11 Female
  6. Baud Rate19.2k, 32k, 38.4k, 48k
  7. Future Release56k, 57.6k, 64k
Visual Indicators
  1. Tx and Rx volume, Local off-hook, Remote off-hook,Yes
  2. FXO, FXS, Ring, Optic Rx, Electric Rx, VccA, VccB, PWR A, PWR BYes
  1. Dry ContactNormal OPEN
  1. Standard12VDC @ 400mA
  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 (Rackmount Unit)
  1. Height(3.53 cm) 1.4"
  2. Width(18.14 cm) 7.2"
  3. Depth(24.89 cm) 9.8"
  4. Weight(907 gm) 2.0 lbs


For more information

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