User's Manual

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INTERFACE DESCRIPT
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2 EDGE Wireless Modem
2.1 EDGE Wireless Modem in a Communication System
Figure 2.1-1 illustrates the main blocks of a wireless communication system using the
EDGE Daughter Card embedded in a host 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 (i.e., the host) and is a part of the
application.
Figure 2.1-1 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. 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 2.1-2 Interface between Daughter Card and Application illustrates the interface
between the Daughter Card and the host application. Each interface signal is described in
Section 3.