The accessibility to the external audio interface is reached by the system connector, containing a 4-pole Jack plug. 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.
INT (HEADDET) XMICP XMICN
Figure 31: 4 Pole Jack plug for audio accessories
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