Sony Ericsson GM28, Integrator'S Manual

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2. GM28 MODEM
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LZT 123 7468 R1A
2.4 Main Features and Services
The modem performs a set of telecom services (TS) according to GSM
standard phase 2+, ETSI and ITU-T. The services and functions of the
modem are implemented by issuing AT commands over the RS232
serial interface.
2.4.1 Types of Mobile Station
The GM28 is a dual band serial modem with the GSM radio
characteristics shown in the table below.
2.4.2 Short Message Service
The modem supports the following SMS services:
• Sending; MO (mobile-originated) with both PDU (protocol data
unit) and text mode supported.
• Receiving; MT (mobile-terminated) with both PDU and text mode
supported.
• CBM (cell broadcast message); a service in which a message is sent
to all subscribers located in one or more specific cells in the GSM
network (for example, traffic reports). This feature is network
dependent.
• SMS STATUS REPORT according to GSM 03.40.
• SMS COMMAND according to GSM 03.40.
The maximum length of an SMS message is 160 characters when using
7-bit encoding. For 8-bit data, the maximum length is 140 characters.
The modem supports up to 6 concatenated messages to extend this
function.
GM28 GSM850 GSM1900
Frequency Range (MHz) TX: 824-849
RX: 869-894
TX: 1850-1910
RX: 1930-1990
Channel spacing 200kHz 200kHz
Number of channels
123 carriers *8 (TDMA)
GSM: channels 128 to 251
298 carriers *8 (TDMA)
PCS: channels 512 to 810
Modulation GMSK GMSK
TX Phase Accuracy < 5º RMS phase error (burst) < 5º RMS phase error (burst)
Duplex spacing 45MHz 80MHz
Receiver sensitivity at
antenna connector
< –102dBm < –102dBm
Transmitter output power
at antenna connector
Class 5
0.8W (29dBm)
Class 1
1W (30dBm)
Automatic hand-over between GSM850 and GSM1900