RS232 9-way serial interface 5 V - 32 V DC input

4-wire audio connection Antenna connection (FME male) FCC and PTCRB approved

2.3TT4031 (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.

Wireless Communication System

 

 

 

 

 

GSM Network

 

 

 

 

 

 

 

 

 

 

 

 

 

Application

 

 

 

 

 

 

 

 

 

 

 

ME status, responses

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TE

 

 

 

MS

 

 

 

 

 

 

 

 

 

 

 

(DTE)

 

 

AT commands to control MS

 

(TT4030)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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.

Owner’s Manual

Rev 1.0

Page 16 of 16