6 2-wire call signal – RTS SSA-424 User Manual
Page 14
14 SSA-424 U
SER
M
ANUAL
2.6
2-W
IRE
C
ALL
S
IGNAL
2.6.1
C
ALL
S
IGNAL
C
ONNECTIONS
FOR
A
UDIOCOM
,
RTS TW
AND
C
LEAR
-C
OM
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
ALL
S
IGNAL
C
ONNECTIONS
FOR
O
THER
2-
W
IRE
C
OMMUNICATION
S
YSTEM
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