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2 GS64 WIRELESS MODEM
2.1 About the Gx64 Family
The Sony Ericsson Gx64 family of devices are Quad Band GSM/GPRS wireless modems
operating in the GSM 850/900/1800/1900 bands.
The products belong to a new generation of Sony Ericsson wireless modems, 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, or GPRS), and make voice calls over the GSM network.
Two software variants of the Gx64 devices exist. One variant is designed to be
controlled from a micro-controller situated on the host application. The other
variant offers the option to run applications embedded onto the module itself. When
using the embedded application version the controlling script can be run internal to
the module, with or without the use of an external control.
A typical application, involves a micro-controller and a wireless modem, in which the
micro-controller sends AT commands to the wireless modem via an RS232
communications link.
2.2 Wireless modems in a Communication System
Figure
2.2-1 and
Figure
2.2-2 illustrate the main blocks of a wireless communication
system using the wireless modem.
Figure
2.2-1 shows the communication system
when the script is embedded on the wireless modem and
Figure
2.2-2 shows the
communication system when a micro-controller is used. They also show the
communication principles of the system and the interface between the wireless
modem and the application. The definitions in the figures, as used elsewhere in this
manual, are in accordance with the recommendations of 3GPP TS 27.007.
• The MS (mobile station) represents the wireless modem and SIM card. The
wireless modem excluding SIM card, is known as the ME (mobile equipment).
• The DTE (data terminal equipment) is the controlling application. This can be
either an external host or an internal embedded application
• The DCE (data circuit terminating equipment) is the serial communication
interface of the MS.