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3.3
Audio interfaces
3.3.1
Handset/Headset Interfaces
Two Handset/Headset interfaces are available at the front side.
Pin assignment: HANDSET INTERFACE
Socket: RJ-10
Pin
Signal
1
HANDSET IN a/+5V phantom power
2
HANDSET OUT b (GND)
3
HANDSET OUT a
4
HANDSET IN b
3.3.2
Analogue Audio interfaces
The system provides two analogue Audio (Audio 1, Audio 2) inputs and outputs.
For the inputs XRL sockets and for the outputs XLR plugs are available.
Pin assignment: ANALOGUE AUDIO INPUT
Socket: 3 pin XLR
Pin
Signal
Push
1
GND
2
1
3
2
A
3
B
Pin assignment: ANALOGUE AUDIO OUTPUT
Socket: 3 pin XLR
Pin
Signal
1
GND
1
2
3
2
A
3
B
Electrical characteristics
Typical characteristics:
Microphone:
Impedance: ~ 2 kOhm
Sensitivity: ~ -60 dB @ 1-kHz
Telephone receiver:
Impedance: ~150 Ohm
Sensitivity: ~ 97dB @ 1-kHz
Description
Ground
+
-
Description
Ground
+
-
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