Emergency Phone Line Bridge - Crash Phone


Features  Product or Application Questions (click here)

  • One Master Port & Up to 7 Extension Ports
  • Voice Bandwidth from 300Hz to 3.4Khz for Toll Quality Sound
  • 12VDC Power Supply, Optional 24VDC or 115/230VAC with Power Adapter
  • Built-In Power Redundancy
  • Rackmount or Standalone
  • Hi Temp or Extreme Temp Options


Designed specifically for emergency phone line applications, the TC8938 receives and broadcasts a 2-wire analog POTS signal to up to 7 remote phones. The initiator of the call can have a conversation with up to 7 remote users on the same phone line.

The TC8938 provides one master FXS port for initiating the emergency phone call. It provides 7 FXS extension ports, each one connecting to 2-wire analog phones. Each remote port provides its own ring generator that rings a conventional 2-wire analog phone.

Diagnostic LEDs for Tx and Rx are included for each channel. Additional LEDs are provided for Alarm, Power A, Power B, and Vcc. Connectors are RJ-11 Female. Power is 12VDC standard, optional 24VDC or 115/230VAC with an external power cube.

The TC8938R PC Card version requires the TCRM191 or TCRM195 19" Rackmount Card Cage. High and extreme temperature versions (-20C to 70C, -40C to 80C), are available for harsh environments.


TC8938 Specifications

Channel Capacity
TC8938 8 (Master+7)
Data Rates
Telephone 300 Hz to 3.4 Khz
Connector RJ11 Female
Interface 2 Wire POTS
Bit error rate 1 in l09 or better
Visual Indicators  
System Status Alarm, Power A, Power B, Vcc
Channel Status Tx Rx
Power source I2VDC @1.2amp
Optional 24 VDC
optional: 115 or 230VAC with external power cube
-100C to 500C
-200C to 700C
-400C to 800C
Storage -400C to 900C
Humidity 95% non-condensing
Stand Alone Unit Height(3.53 cm) 1.39"
  Width(18.13 cm) 7.14"
  Depth (24.89 cm) 9.80"
  Weight (887 gm) 1.96 lb

Typical Application (Application Questions)

The TC8938 is often used in Crash Phone network applications in airports. Up to 8 users can be linked into one phone-line conversation.

For example, if an emergency at an airport occurs, picking up the master phone in the control tower will automatically ring all remote telephone extensions. Remote extensions could be located at local police, fire, ambulance and health facility locations. Up to 8 users can be linked into one phone-line conversation. A PBX is not required.