MS

SIM

DC

POWER

STATUS &

RESPONSE

DTE

DTE

COMMAND & CONTROL

INTERFACE SYSTEM

SIM

GR64

GSM

NETWORK

 

 

 

 

 

GSM

GSM

ENGINE

ENGINE

DCE

DCE

Figure 2.2-2 Main Blocks in a Wireless System (external micro-controller)

In accordance with the recommendations of ITU-T (International Telecommunication Union - Telecommunications Standardization Sector) V.24, the TE communicates with the MS over a serial interface.

The functions of the wireless modem follow the recommendations provided by 3GPP (3rd Generation Partnership Project) and ITU-T. 3GPP is a collaboration agreement that was established in December 1998. The collaboration agreement brings together a number of telecommunications standards bodies which are known as Organizational Partners. The current Organizational Partners are ARIB, CCSA, ETSI, ATIS, TTA, and TTC.

3GPP specifies a set of AT commands for controlling the GSM element of the wireless modem; these commands are supplemented by Sony Ericsson specific commands.

To find out how to work with AT commands, see the AT Commands Manual.

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