Sony Ericsson GM29 manual Audio Connector, Antenna Connector

Audio Connector

A4-way RJ9 connector, as shown below, allows a telephone handset to be plugged into the modem, giving access to the microphone and earpiece signals. The connector may also be used to drive other analogue audio sub-systems or devices.

The GM29 is configured to work with a range of handsets.

CAUTION! Not all handsets use the pin-outs shown below for microphone and earpiece.

If necessary, changes can be made to the characteristics of the audio interface by sending the modem appropriate AT commands.

RJ9 Handset Connector

4 3 2 1

	1	MICN	3	BEARP
	2	BEARN	4	MICP
Signal		Description
MICN		Microphone negative input
BEARN		Earpiece negative output
BEARP		Earpiece positive output
MICP		Microphone positive input

Antenna Connector

Connect a GSM antenna to this port. Single (900 or 1800 MHz) or dual band (900/1800 MHz) antennas may be used. The modem is fitted with a 50 Ω, FME male coaxial jack.

FME Connector

RF Signal
	GND
Signal	Description
RF	RF input/output
GND	Ground connection

Electrical Connections 7