Sony Ericsson TT4031 (SE-GM29) - Manual (Page 17)

Owner’s Manual Rev 1.0 Page 17 of 17
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”.
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.
TE
(Application)
MS
(TT4030)
RJ9
DB9
RJ11
Antenna
Connector
Power
and Signals
Audio
Serial data