Model TC1900

"Quick-Talk" Async RS-232 Phone Extenders



  • 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


    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.

    Quick-Talk is typically used to extend dial-up phone service to remote sites over a RS-232 circuit (TC1900). Other examples include extending a secured phone link to a remote site via an existing RS-232 connection or setting up "hot links" via existing RS-232 links on satellite, fiber optic or microwave networks. When both sides are set to FXS, a "Hot Link" can be established.

    The TC1900 supports toll quality voice, asynchronous baud rates from 19.2K and bandwidths from 300Hz to 3.4Khz. Sixteen diagnostic LEDs and a Dry Contact for External Alarm and Ringer Connection are standard.


    TC1900 Specifications
    Audio Bandwidth
    Audio Bandwidth 300Hz to 3.4KHz
    Phone Connector RJ11 Female
    Ring Voltage 70Vrms at 20Hz (Depending on the ringing load)
    FXO Input Impedance 600 Ω
    FXS Output Impedance 600 Ω
    RS-232 Connector RJ11 Female
    Baud Rate 19.2k, 32k, 38.4k, 48k
    Future Release 56k, 57.6k, 64k
    Bit error rate 1 in l09 or better
    Visual Indicators
    Tx and Rx volume, Local off-hook, Remote off-hook Yes
    FXO, FXS, Ring, Optic Rx, Electric Rx, VccA, VccB, PWR A, PWR B Yes
    Dry Contact Normal OPEN
    Standard 12VDC @400mA
    optional 115 or 230VAC
    with external power cube
    optional  24VDC or -48VDC, or 125VDC
    Operating -100C to 500C
    Hi-Temp (Optional) -200C to 700C
    Extreme Temp (Optional) -400C to 800C
    Storage -400C to 900C
    Humidity 95% non-condensing
    Height   (3.53cm) 1.40"
     Width  (18.14cm) 7.25"
     Depth  (24.89cm) 9.85"
     Weight  (907gm) 2.0 lbs

    Typical Application  (Application Questions)

    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