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

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Sony Ericsson GM29 manual Audio Connector, Antenna Connector