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ST-TC1 Telephone System Coupler - CO Line Simulator

ST-TC1 Telephone System Coupler - CO Line Simulator

Radio Design Labs - Telephone System Coupler - CO Line Simulator

  • 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

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.

Typical Performance:

Line Connection:

Simulated telco central office line to feed telephone system

Audio In / Out Impedance:

600 Ω 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


Simulate a Telco CO Line, Connect to local telephone switch instrument, Add Radio Control Paging to KSU, Contact Closure when Line is Off-hook, Audio Input/Output from Telephone Switching Unit, The ST-TC1 intended to connected to an on-site telephone system switching unit KSU It NOT intended to connected directly to telephone CO line Connections from ST-TC1 go into telephone switching unit if ST-TC1 was an incoming phone line, When KSU seizes line to ST-TC1, relay contact closure provided which can used to control variety of equipment, such paging system radio system closure maintained long line seized 600 Ω transformer-isolated audio feed available audio input to output from telephone switching unit ST-TC1 will pass DTMF audio from telephone keypad other DTMF generating device, The ST-TC1 utilized to add paging zones radio system interface to telephone system When any instrument in telephone system seizes line associated ST-TC1, relay closes to activate radio paging function, audio spoken into handset broadcast ST-TC1 can not connected to phone line that has ringer voltage present, The ST-TC1 can used in conjunction RDL's® ST-VOX1 modules to provide two-way communication ST-VOX1 will provide necessary push-to-talk function to key two-way communications systems, format converter Data/Installation

Mounting Accessories:

Mounting Kit - RU, ST and TX SeriesMB-1
Mounting Kit - RU, ST and TX Series

Kit to Mount ST, TX Series Modules on FP PanelMB-3
Kit to Mount ST, TX Series Modules on FP Panel

Snap Rail Adapter - STICK-ON SeriesMSR-1
Snap Rail Adapter - STICK-ON Series

Universal Rack Chassis - RU, ST and TX SeriesRC-1U
Universal Rack Chassis - RU, ST and TX Series

Rack Mount for 3 RACK-UP Series ProductsRU-RA3A
Rack Mount for 3 RACK-UP Series Products

STICK-ON Mounting KitSMK-12
STICK-ON Mounting Kit

STICK-ON Series Mounting Rack - 10 ModulesSR-10
STICK-ON Series Mounting Rack - 10 Modules

STICK-ON Series Mounting Rack - 12 ModulesSR-12A
STICK-ON Series Mounting Rack - 12 Modules

STICK-ON Series Mounting Rack - 7 Modules max.SR-4
STICK-ON Series Mounting Rack - 7 Modules max.

STICK-ON Series Racking System - 12 ModulesSTR-19A
STICK-ON Series Racking System - 12 Modules

STICK-ON Series Racking System - 10 ModulesSTR-19B
STICK-ON Series Racking System - 10 Modules

Single Wide Enclosure - RACK-UP MountsUC-1
Single Wide Enclosure - RACK-UP Mounts

Double Wide Enclosure - RACK-UP MountsUC-2
Double Wide Enclosure - RACK-UP Mounts

Table Top Chassis for RU, ST and TX SeriesWDG1
Table Top Chassis for RU, ST and TX Series

STICK-ON DIN Rail AdapterDRA-35S
STICK-ON DIN Rail Adapter

Stick-On DIN Rail AdapterDRA-35S6
Stick-On DIN Rail Adapter

General Accessories:

STICK-ON® Series Detachable Terminal BlockDTB
STICK-ON® Series Detachable Terminal Block

Accessory Mounting SystemAMS
Accessory Mounting System

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Copyright © 2008 Radio Design Labs, Inc. RDL, Radio Design Labs, the RDL logo, STICK-ON, RACK-UP and the Rack-Up logo are registered trademarks of Radio Design Labs, Inc. Flat-Pak, RCX, SourceFlex, SupplyFlex, Sure-Lok, TX, ULTRASTYLE, and Specialists in Practical Precision Engineering are trademarks of Radio Design Labs, Inc. All other trademarks are the property of their respective owners. Typical Performance reflects product at publication time exclusive of EMC data, if any, supplied with product. Date last modified: June 20 2008