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.

2.3 Features

The wireless modem performs a set of telecom services (TS) according to 3GPP release 99 and ITU-T. The functions of the wireless modem are implemented by issuing AT commands over a serial interface.

2.3.1 Types of Mobile Station

The GS64 is a fully Quad Band capable GSM/GPRS mobile station with the characteristics shown in the table below.

Feature

Frequency range (MHz)

Channel spacing

Number of channels

Tx

Rx

GSM850

 

E-GSM900

 

GSM1800

 

GSM1900

 

824-849

 

880-915

 

1710-1785 1850-1910

 

 

 

 

 

 

 

 

 

869-894

 

925-960

 

1805-1880 1930-1990

 

200kHz

 

200kHz

 

200kHz

 

200kHz

 

124

174

374

299

 

Number of Time Division slots

Duplex spacing

GSM power class

Modulation

Receive sensitivity

GPRS multi-slot class

8

8

8

8

 

45MHz

 

45MHz

 

95MHz

 

80MHz

 

4 (2W)

 

4 (2W)

 

1 (1W)

 

1 (1W)

GMSK

<-102dBm at antenna connector

Class 10

LZT 123 1836

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