3 features, Features – Sony Ericsson GR47/GR48 User Manual

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2. GR47/GR48 RADIO DEVICES

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

Number of channels

174 carriers *8 time slots

374 carriers *8 time slots

Modulation

GMSK

TX phase accuracy

< 5º RMS phase error (burst)

Duplex spacing

45 MHz

95 MHz

Receiver sensitivity at

antenna connector

< –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

Number of channels

124 carriers *8 time slots

299 carriers *8 time slots

Modulation

GMSK

TX Phase Accuracy

< 5º RMS phase error (burst)