24-Pin Docking Connector: 
Pin Signal Names Function
1 ADP_IN 5 Vdc 2A – Adapter input - part number 395250 Output connector need to modified to mate with new I/O sync connector.
2 ADP_IN 
3 ADP_IN 
4 ADP_IN 
5 VBUS_FS 2.0 USB Full Speed Host
6 D+HHS 
7 D-HHS 
8 GND System Ground
9 D+OTG 2.0 USB High Speed On-The-Go
10 D-OTG 
11 VBUS_OTG 
12 ID_OTG 
13 GND System Ground
14 ID_READ Accessory Identification – Connect GPI to ID_READ and GPO to ID_POWER.
15 ID_POWER 
16 AGND Audio Head Set Connection
17 HeadSetAudioLeftOut 
18 HeadSetAudioRightOut 
19 HeadSetMicIn 
20 GND System Ground
21 Reserved1 Reserved for future use – No Connect
22 Reserved2 
23 Reserved3 
24 GND System Ground
Shell GND System Ground