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2. GM47/GM48 MODULES
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LZT 123 7263 R1C
2.3 Features
The module performs a set of telecom services (TS) according to GSM
standard phase 2+, ETSI and ITU-T. The functions of the module are
implemented by issuing AT commands over a serial interface.
2.3.1 Types of Mobile Station
GM47 and GM48 are dual band mobile stations with the characteristics
shown in the tables below.
GM47 GSM900 E-GSM900 GSM1800
Frequency Range (MHz) TX: 890-915
RX: 935-960
TX: 880-890
RX: 925-935
TX: 1710-1785
RX: 1805-1880
Channel spacing 200kHz 200kHz
Number of channels 173 carriers *8 (TDMA)
GSM: channels 1 to 124
E-GSM: channels 975 to 1023
374 carriers *8 (TDMA)
DCS: channels 512 to 885
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 GSM 900 and GSM1800
GM48 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