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DSI-2008 Installation 17

Bosch Security Systems, Inc.

User Manual

F.01U.193.295

Rev. 05

2-Wire Call Signal

Call Signal Connections for Audiocom and RTS TW

The call signals are superimposed on the audio signal, so no separate call signal connections are required.

Call Signal Connections for Other 2-Wire Communication Systems

Any other 2-wire device must be able to generate and receive a 20kHz signal superimposed on the audio as follows:

DSI 2008 Signal Specifications for balanced configuration:

DSI 2008 Receive: 20kHz ±100Hz, 100mV

RMS

DSI 2008 Send: 20kHz ±800Hz, 500mVRMS ±10%

DSI 2008 Signal Specifications for unbalanced configuration:

DSI 2008 Receive: 20kHz ±100Hz, 100mV

RMS

DSI 2008 Send: 20kHz ±800Hz, 350mVRMS, ±10%

Balanced Audio Configuration

Pin 1 No Connection

Pin 2 Balanced 20 kHz + Input/Output

Pin 3 Balanced 20 kHz - Input/Output

Unbalanced Configuration 1

Pin 1 20kHz Common

Pin 2 20kHz Input/Output

Pin 3 No Connection

Unbalanced Configuration 2

Pin 1 20kHz Common

Pin 2 No Connection

Pin 3 20kHz Input/Output

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