The ST‑TC1 is intended to be connected to an on‑site telephone system switching unit KSU. It is NOT intended to be connected directly to a telephone CO line. Connections from the ST‑TC1 go into the telephone switching unit as if the ST‑TC1 was an incoming phone line.
When the KSU seizes the line to the ST‑TC1, a relay contact closure is provided which can be used to control a variety of equipment, such as a paging system or radio system. The closure is maintained as long as the line is seized. A 600 Ω transformer‑isolated audio feed is available for audio input to or output from the telephone switching unit. The ST‑TC1 will pass DTMF audio from a telephone keypad or other DTMF generating device.
The ST‑TC1 may be utilized to add paging zones or radio system interface to a telephone system. When any instrument in the telephone system seizes the line associated with the ST‑TC1, the relay closes to activate the radio or paging function, and the audio spoken into the handset is broadcast. The ST‑TC1 can not be connected to a phone line that has ringer voltage present.
The ST‑TC1 can be used in conjunction with RDL's® ST‑VOX1 modules to provide two‑way communication. The ST‑VOX1 will provide the necessary push‑to‑talk function to key the two‑way communications systems.
Power supply is required.
- Simulate a Telco CO Line
- Connect to local telephone switch or instrument
- Add Radio Control or Paging to KSU
- Contact Closure when Line is Off-hook
- Audio Input/Output from Telephone Switching Unit
- Line Connection: Simulated telco central office line to feed telephone system
- Audio In / Out Impedance: 600 ohms balanced
- Switching Contacts: Double-pole, double-throw
- Max. Switching Power: 60 W, (220 Vdc, 125 Vac, 2 A)
- Power Requirement: GROUND-REFERENCED, 24 to 33 Vdc @ 50 mA
- Ambient Operating Environment: 0° C to 55° C
