ETSI specifies a set of AT commands for controlling the GSM element of the modem; these commands are supplemented by Sony Ericsson specific commands.

To find out how to work with AT commands, see “Part 3: Using AT Commands”.

Figure 2.2 illustrates the interface between the modem and the application. The entire System Connector Interface is described in detail in “Electrical Description”.

 

Power

 

 

 

 

and Signals

 

 

 

 

 

 

RJ11

 

 

 

 

 

 

 

 

Audio

 

 

 

Antenna

 

 

 

 

 

 

 

RJ9

MS

Connector

 

 

 

 

TE

Serial data

 

 

(TT4030)

 

 

DB9

 

 

(Application)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 2.2 The Interface between the modem and the Application

ITU-T standards define TE and TA as DTE (Data Terminal Equipment) and DCE (Data Circuit Terminating Equipment) respectively.

Owner’s Manual

Rev 1.0

Page 17 of 17