2-Wire Call Signal Connections; Call Signal Connections For Audiocom, Rts Tw And Clear-Com; Call Signal Connections For Other 2-Wire Communication System - RTS SSA-424 User Instructions

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2.6 2-WIRE CALL SIGNAL CONNECTIONS

2.6.1 Call Signal Connections for Audiocom,

RTS TW and Clear-Com

The call signals are superimposed on the audio signal, so

no separate call signal connections are required. However,

make sure that a call enable switch or jumper is installed

for Clear-Com applications as shown in Figures

2.6.2 Call Signal Connections for Other 2-wire

Communication System

Any other 2-wire device must be able to generate and re-

ceive a 20 kHz signal superimposed on the audio as fol-

lows:

Balanced Audio Configuration

Pin 1: No connection

Pin 2: Balanced 20 kHz + Input/Output

Pin 3: Balanced 20 kHz - Input/Output

SSA-424 Signal Specifications for balanced configuration:

SSA-424 Receive: 20 kHz ±100 Hz, 100mV p-p

SSA-424 Send: 20 kHz ±800 Hz, 1V p-p

Unbalanced Configuration 1

Pin 1: 20 kHz Common

Pin 2: 20 kHz Input/Output

Pin 3: No connection

Unbalanced Configuration 2

Pin 1: 20 kHz Common

Pin 2: No connection

Pin 3: 20 kHz Input/Output

SSA-424 Signal Specifications for unbalanced configu-

rations:

SSA-424 Receive: 20 kHz ±100 Hz, 0.3 Vrms

SSA-424 Send: 20 kHz ±200 Hz, 100 mVrms

14 User Instructions, SSA-424 Dual Digital Hybrid

and 6.

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