Clear-Com TW-12C Encore Intercom System Interface for Clear-Com and RTS Integration

The Clear Com TW-12C connects one intercom system to another. Optoisolation eliminates hums and buzzes. Compensates for level and impedance differences between systems. Allows Clear-Com-to-Clear-Com, Clear-Com-to-RTS, and RTS-to-RTS system configurations. Powered by the connected intercom system. Translates “call" signals in both directions.

Features:

Eliminates grounding problems between intercom systems
Matches gain between systems
Provides system isolation for: Clear-Com to Clear-Com; Clear-Com to RTS; RTS to RTS
Passes through and translates signaling
Provides superior hybrid nulling–up to 40 dB
Setup tone allows adjustment during operation
Powered from connected systems
Uses just one rack space

Clear Comm Format
Line Characteristics
Max Level Before Clipping	3dBu
Impedance	10K Ohms
Signalling
Receive	4 VDC
Send	11VDC
RTS Format
Line Characteristics
Max Level Before Clipping	5dBu
Impedance	10K Ohms
Signalling Tone
Send frequency	20kHz ±100Hz
Receive frequency	20kHz ±500Hz
Send level	-6dBu
Receive level	-25dBu
General Characteristics
Frequency response
Party Line - Party Line	200-8KHz
Distortion
Party Line - Party Line	<=0.2%
Max Gain
ClearCom - RTS	9dB
ClearCom - ClearCom	4dB
RTS - ClearCom	-1dB
RTS - RTS	4dB
Min Gain
ClearCom - RTS	1dB
ClearCom - ClearCom	-4dB
RTS - ClearCom	-9dB
Power Requirements
Input Voltage Range	20-30VDC
Input Current (average)	50mA
Rear Panel Connectors
Rear panel	(2) XLR3M;(1 per channel);(2) XLR3F;(1 per channel)
Front Panel Connectors
Headset	(1) XLR4M
TS1 Earphone	(1) 3.5mm Jack Socket
Front Panel Controls and Indicators
Power	(2) Green LED (1 per channel)
Null Test Button	(2) Buttons (1 per channel)
Gain Level Adjust	(2) Controls (1 per channel)
Null Adjust	(6) Controls (3 per channel)
Connection Type Switch	(2) Switches (1 per channel)
Pin Connection Select Switch	(2) Switches (1 per channel)
Dimensions	1.75in. H x 19in. W x 7.25in. D (45 x 483 x 185 mm)
Weight	5.63 lbs. (2.56 Kg)

Transparent Isolation Between Systems : The unique TW-12C completely eliminates hums and buzzes caused by ground loops. The TW-12C compensates not only for level differences between systems, but for varying impedances caused by transformers and capacitance on the lines. The TW-12C provides an electrically isolated interface between the two intercom systems.The interface consists of two identical, 2-wire-to-4-wire hybrid networks which break the ground loops that occur when two systems are run from separate power sources. The audio paths are transformer-coupled and the signaling circuits are opto-isolated.

Fast, Easy & Accurate Setup: The operator can quickly set up the TW-12C by using a standard intercom headset and the TW-12C’s built-in setup tone. The TW-12C is capable of a range of null adjustments, allowing it to adapt to a wide variety of line conditions, line lengths, and impedances.The TW-12C provides each side of the system with null adjustment controls that allow adjustment even when the system is operating. The rear panel of the TW-12C contains a pair of 3-pin XLR connectors (one male, one female) for each side of the interface.

Call Signal Translation: The TW-12C interface receives “Call" signaling in the appropriate form (DC level for Clear-Com, tone for RTS), decodes it, and passes it to the other side of the interface, via an optical coupler. The receiving side of the interface sends the signal appropriate for the connected intercom.

Power: Each side of the TW-12C is powered directly by the intercom system to which it is connected. The unit draws about the same amount of power as a belt-pack. If either system is disconnected, the power loss immediately shuts down the associated electronics, eliminating any unwanted noises on the operating intercom side.The TW-12C front panel provides an LED power indicator for each side of the interface.

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Clear-Com TW-12C Encore Intercom System Interface for Clear-Com and RTS Integration

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