RDL STTC1 Telephone System Coupler, CO Line Simulator

Radio Design Labs' 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

Note

NOTE: Radio Design Labs' PS-24AS power supply is NOT included but is required in order to power this product. Please see the "Accessories" tab or click here for more information on the PS-24AS power supply.