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Radio Design Labs
STTC1
Telephone System Coupler
STTC1
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 Ohm transformer-isolated audio feed is available for audio to or 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 a radio system interface to a telephone system. When any instrument in the telephone system picks up 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 funtion to key the two-way comuunications systems.
Specifications:
- 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, 125 VA
- Max switching voltage: 220 Vdc, 250 Vac
- Max. switching current: 2 A
- Max. carrying current: 3 A
- Power Requirement: 24 to 33 Vdc @ 50 mA, Ground-Referenced
Our Part # STTC1
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