
External audio connector
The system connector, containing a 4-pole Jack plug, gains the access to the external audio interface. The Jack
plug, which is integrated in the system connector, contains a mechanical switch, which is used to detect the
connection of the accessories. The configuration for the 4-pole Jack-plug is shown in the following figure.
Figure 147 4-pole jack plug for audio accessory
Table 13 Connector for External Audio Accessories
Line symbol
Function
XMICP
External microphone signal input
XMICN
External microphone signal input
XEARP
External earphone signal output
XEARN
External earphone signal output
INT
Accessory detection
GND
Ground (Only used by PPH-1)
External signals and connections
Table 14 System connector
Signal
From
To
Min
Nom
Max
Condi-tion
Note
XMICP
HS/HF Mic
UEMC
Lite
2/60mV
diff
Analog
audio in
Headset Mic bias and audio
signal 2mV nominal. HF Mic
signal 60mV nominal.
Differential symmetric
input.
DC bias
2V2kohm
Accessory detection by
bias loading
XMICN
2/60mV
diff
Ana in / 1k to
GND
Hook interrupt by heavy
bias loading
RH-64
System module
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