User's Manual

Confidential

USERS MANUAL

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Document number Revision

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2 EDGE Wireless Modem

2.1 EDGE Wireless Modem in a Communication System

Figure 2-1 illustrates the main blocks of a wireless communication system using the

EDGE Daughter Card embedded in the host equipment device. 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 EDGE Daughter Card modem plus SIM card.

• The modem excluding SIM card, is known as the ME (mobile equipment).

• The TE (terminal equipment) is a micro-controller 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. In this case this is the Universal Serial Bus (USB).

The functions of the EDGE modem follow the recommendations provided by ETSI

(European Telecommunications Standards Institute) and ITU-T.

ETSI specifies a set of AT commands for controlling the GSM/E-GSM element of the

modem; these commands are supplemented by Sony Ericsson specific commands.

Figure 2-2 illustrates the interface between the Daughter Card and the the host equipment

application. Each interface signal is described in Section 3.

(EDGE

MODEM)

(DTE)

GSM Network

MS Status, responses

AT commands to control MS

Host Equipment