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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 GSM850 E-GSM900 GSM1800 GSM1900
Tx 824-849 880-915 1710-1785 1850-1910
Frequency range (MHz)
Rx 869-894 925-960 1805-1880 1930-1990
Channel spacing 200kHz 200kHz 200kHz 200kHz
Number of channels 124 174 374 299
Number of Time Division slots 8 8 8 8
Duplex spacing 45MHz 45MHz 95MHz 80MHz
GSM power class 4 (2W) 4 (2W) 1 (1W) 1 (1W)
Modulation GMSK
Receive sensitivity <-102dBm at antenna connector
GPRS multi-slot class Class 10