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2.6
2-W
C
IRE
ALL
2.6.1
C
S
C
ALL
IGNAL
RTS TW
C
AND
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 applica-
tions as shown in Figures 5 and 6.
2.6.2
C
S
C
ALL
IGNAL
W
C
IRE
OMMUNICATION
Any other 2-wire device must be able to generate
and receive a 20kHz signal superimposed on the
audio as follows:
Balanced Audio Configuration
Pin1:
No connection
Pin 2:
Balanced 20 kHz + Input/Output
Pin 3:
Balanced 20 kHz - Input/Output
SSA-424 Signal Specifications for balanced configu-
ration:
SSA-424 Receive: 20kHz ±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
configurations:
SSA-424 Receive: 20 kHz ±100 Hz, 0.3Vrms
SSA-424 Send: 20 kHz ±200 Hz, 100m Vrms
14 SSA-424 U
M
SER
ANUAL
S
IGNAL
A
ONNECTIONS FOR
UDIOCOM
-C
LEAR
OM
O
ONNECTIONS FOR
THER
S
YSTEM
,
2-
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