Sony Ericsson GM47/GM48 Modules, About the GM47/GM48 Family, GM47 in a Communication System

2.GM47/GM48 MODULES

2.GM47/GM48 Modules

2.1 About the GM47/GM48 Family

Two modules make up the family; GM47 and GM48, for use in the 900/1800MHz and 850/1900MHz GSM bands respectively.

Note! As the characteristics of the modules are quite similar, this manual only refers to the GM48 where a difference exists; by default all other references are to the GM47.

The products belong to a new generation of Sony Ericsson modules, and are intended to be used in machine-to-machine applications and man-to- machine applications. They are used when there is a need to send and receive data (by SMS, CSD, HSCSD, or GPRS), and make voice calls over the GSM network.

GM47 modules are not “stand alone” devices; they are used as the engine in an application created by the customer. A typical application, involves a micro-controller and GM47 module, in which the micro- controller sends AT commands to the module via an RS232 communications link.

2.2 GM47 in a Communication System

Figure 2.1 illustrates the main blocks of a wireless communication system using the GM47. 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 GM47 module plus SIM card. The module 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	(GM47)

Figure 2.1 Main Blocks in a Wireless System

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