User Manual

2. GT47/GT48 CONTROL TERMINALS
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LZ T 123 7605 P1C
In accordance with the recommendations of ITU-T (International
Telecommunication Union - Telecommunications Standardisation Sector)
V.24, the TE communicates with the MS over a serial interface.
The functions of the radio device follow the recommendations provided by
ETSI (European Telecommunications Standards Institute) and ITU-T.
ETSI specifies a set of AT commands for controlling the GSM element of
the Control Terminal; these commands are supplemented by Sony Ericsson
specific commands.
Note! To find out how to work with AT commands, see the GR47/GR48 AT
Commands Manual.
2.4 Main Features and Services
The Control Terminal performs a set of telecom services (TS) according to
GSM standard phase 2+, ETSI and ITU-T. The services and functions of
the Control Terminal may be implemented using customised applications
embedded on the device, or by AT commands over the RS232 serial
interface.
2.4.1 Types of Mobile Station
The GT47 and GT48 are dual band Control Terminals with the GSM radio
characteristics shown in the table below.
GT47 E-GSM900 GSM1800
Frequency Range (MHz) TX: 880-915
RX: 925-960
TX: 1710-1785
RX: 1805-1880
Channel spacing 200kHz 200kHz
Number of channels 174 carriers *8 time slots 374 carriers *8 time slots
Modulation GMSK GMSK
TX phase accuracy < 5º RMS phase error (burst) < 5º RMS phase error (burst)
Duplex spacing 45MHz 95MHz
Receiver sensitivity at
antenna connector
< –102dBm < –102dBm
Transmitter output power at
antenna connector
Class 4
2W (33dBm)
Class 1
1W (30dBm)
Automatic hand-over between EGSM 900 and GSM1800