User Manual

2. GR47/GR48 RADIO DEVICES
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LZT 123 7589 R1A
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 radio device; 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 radio device performs a set of telecom services (TS) according to GSM
standard phase 2+, ETSI and ITU-T. The functions of the radio device are
implemented by issuing AT commands over a serial interface.
2.3.1 Types of Mobile Station
GR47 and GR48 are dual band mobile stations with the characteristics
shown in the tables below.
GR47 E-GSM 900 GSM 1800
Frequency Range (MHz) TX: 880-915
RX: 925-960
TX: 1710-1785
RX: 1805-1880
Channel spacing 200 kHz 200 kHz
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 45 MHz 95 MHz
Receiver sensitivity at
antenna connector
< –102 dBm < –102 dBm
Transmitter output power at
antenna connector
Class 4
2 W (33 dBm)
Class 1
1 W (30 dBm)
Automatic hand-over between E-GSM 900 and GSM 1800
GR48 GSM 850 GSM 1900
Frequency Range (MHz) TX: 824-849
RX: 869-894
TX: 1850-1910
RX: 1930-1990
Channel spacing 200 kHz 200 kHz
Number of channels 124 carriers *8 time slots 299 carriers *8 time slots
Modulation GMSK GMSK
TX Phase Accuracy < 5º RMS phase error (burst) < 5º RMS phase error (burst)