Sony Ericsson TT4031 (SE-GM29) - Manual (Page 16)

Owner’s Manual Rev 1.0 Page 16 of 16
RS232 9-way serial interface
5 V - 32 V DC input
4-wire audio connection
Antenna connection (FME male)
FCC and PTCRB approved
2.3 TT4031 (SE-GM29) in a Communication System
Figure 2.1 illustrates the main blocks of a wireless communication system
using the TT4031 (SE-GM29). It also shows the communication principles of
the system. The definitions in the figure, as used elsewhere in this manual,
are in accordance with the recommendations of GSM 07.07.
The MS (mobile station) represents the TT4031 (SE-GM29)
modem plus SIM card. The modem excluding SIM card, is known
as the ME (mobile equipment).
The TE (terminal equipment) is a micro-controller (i.e., a
computer) and is a part of the application.
Figure 2.1 Main Blocks in a Wireless System
In accordance with the recommendations of ITU-T (International
Telecommunication Union - Telecommunications Standardisation Sector)
V.24, the TE communicates with the MS over a serial interface.
The functions of the TT4031 (SE-GM29) follow the recommendations
provided by ETSI (European Telecommunications Standards Institute) and
ITU-T.
Application
TE
(DTE)
MS
(TT4030)
ME status, responses
AT commands to control MS
GSM Network
Wireless Communication System