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System Connector Signals
External units are connected to the Transceiver Board via the 12-pin System Con-
nector.
Pin
1
2
3
4
5
6
7
8
9
10
11
12
1 2
3
Signal
In/Out
AFMS
Out
ATMS
In
EXTAUD
In
AGND
PORTHF
In
MUTE
Out
VPPFLASH
In
VDD
Out
DFMS
Out
GND
DTMS
In
DCIO
In/Out
11
12
Function
Audio From Mobile Station
Audio To Mobile Station
External Analog Audio Accessory Sense
Audio Signal Ground, 0V reference
Portable Handsfree
Music Mute
Flash Memory Voltage and Service Voltage
Logic Reference, Status ON
Data From Mobile Station
Digital Ground and DC Return
Data To Mobile Station
DC positive pole for phone battery charging
and external accessory powering
Service Instructions
5
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