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Fiber Optic Telephone/Analog Extender (w/ Single Fiber Bi-Directional Option)

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The TC1903 "Quick-Talk" Fiber Optic Phone/Analog Extender comes in a small, modem-sized form factor and extends analog and POTS telephone service to remote sites. It is compatible with most PBXs or Key Systems and provides 2-wire FXS on the telephone side with ring down capability and FXO on the PBX side.

  • Extend Telephone or 2/4-Wire Analog 600Ω Link with Fiber
  • PBX and Key System Compatible
  • 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
  • -40°C - +80°C Extreme Temperature Option Available
  • Rackmount or Standalone
  • Operates Over Single Fiber
  • Tested and Compatible with:
    code blue ramtel talk a phone

The TC1903 is most often used to extend telephone service in campus networks, power plants and substations or as an existing service data channel to set up a telephone link.


The TC1903 is often used to extend telephone/analog service in campus networks, power plants, substations, etc., or use an existing service data channel to set up a telephone/analog link. It is also used to set up "hot" telephone service via fiber optic networks. Other applications include taking advantage of the inherent benefits of fiber optics to reduce noise/EMI or maximize security/isolation.

TC1903 - Fiber Telephone Extender
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Audio Bandwidth
  1. Bandwidth300Hz to 3.4Khz
  1. TransmitterLED/ELED
  2. ReceiverPIN Diode
  3. Wavelength850nm/1300nm Multimode, 1300nm/1550nm Single Mode
  4. Fiber Optic ConnectorsST or SC
  5. Loss Budget * - 850/1300/1550nm
  6. Multimode @62.5/125µm15dB
  7. Single Mode @9/125µm20dB
  1. Phone ConnectorRJ11 Female
  2. Ring Voltage55Vrms at 25Hz (Depending on the ringing load)
  3. FXO Impedance600Ω
  4. FXS Impedance600Ω
Visual Indicators
  1. Tx and Rx volume, Local off-hook, Remote off-hook, FXOYes
  2. FXS, Ring, Optic Rx, Electric Rx, VccA, VccB, PWR A, PWR BYes
Alarm / Ring
  1. Dry ContactNormal OPEN
  1. Standard12VDC @500mA
  2. Optional24VDC, -48VDC, 125VDC, or 115/230VAC with Power Cube
  1. Operating-10°C to 50°C
  2. Optional-20°C to 70°C
  3. Storage-40°C to 90°C
  4. Humidity95% non-condensing
Physical (Standalone Unit)
  1. Height(3.53 cm) 1.39"
  2. Width(18.13 cm) 7.14"
  3. Depth(16.59 cm) 6.53"
  4. Weight(544 gm) 1.2 lbs
* Contact factory for higher requirements


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