Trouble Shooting Guide, Advanced
4/00021-3/FEA 209 544/25 C
Ericsson Mobile Communications AB
4(78)
1.5 External connectors
External units are connected to the transceiver by means of an 11-pin connector on the bottom
of the phone.
The pin numbering is starting from the right when looking on the system connector with the
front up.
Pin Signal Function
1 DCIO DC+ pole for charging phone battery and external
accessory powering.
2 GND Digital GND and DC return.
3 VPPFLASH Flash memory Vpp /Service.
4 GND Audio signal GND, 0 V reference.
5 CFMS_PHFS Accessory Control From Mobile Station serial (ACB)
communication/ Portable Hands Free Sense.
6 CTMS Accessory Control To Mobile Station serial (ACB)
communication.
7 DFMS Data From Mobile Station, serial bus communication.
8 DTMS Data To Mobile Station, serial bus communication/
External accessory Power on
9 CTS_ON Mobile station Clear To Send/ ON REQuest
10 AFMS/RTS Audio from Mobile station/ Ready To Send
11 ATMS Audio to Mobile station
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