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.
