Standard Horizon manual GM29 in a Communication System, Main Blocks in a Wireless System

2.GM29 MODEM

2.3GM29 in a Communication System

Figure 2.1 illustrates the main blocks of a wireless communication system using the 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 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

Application

TE

(DTE)

GSM Network
ME status, responses
	MS
AT commands to control MS	(GM29)

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 GM29 follow the recommendations provided by ETSI (European Telecommunications Standards Institute) and ITU-T.

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”, page 51.

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