GM47R5/GM48R5 RADIO DEVICES
9
LZT 123 8020 R1B
Figure 2.2 Main Blocks in a Wireless System (external micro-
controller)
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 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
GM47r5 and GM48r5 are dual band mobile stations with the
characteristics shown in the tables below.
GM47r5
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
All manuals and user guides at all-guides.com
