User Manual

GM47/48 Technical description
BA/SEM/MS 02:0004 Rev B
6
1.2 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 the serial
interface. Supported AT commands are listed in section 5, these are
defined further in GSM 7.05.
1.2.1 Type of Mobile Station
The GM 4X family are normal dual band type of MS with the
following characteristics.
GM 47 GSM 900 E-GSM 900 GSM 1800
Frequency Range
(MHz)
TX: 890-915
RX: 935-960
TX: 880-890
RX: 925-935
TX: 1710-1785
RX: 1805-1880
Channel spacing 200 kHz 200 kHz
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 45 MHz 95 MHz
Receiver sensitivity at
antenna connector
< - 102 dBm < - 102 dBm
Transmitter output
power at antenna
connector
Class 4
2W (33 dBm)
Class 1
1W (30 dBm)
Automatic hand-over between GSM 900 and GSM 1800
GM 48 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 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 45 MHz 80 MHz
Receiver sensitivity at antenna
connector
< - 102 dBm < - 102 dBm
Transmitter output power at
antenna connector
Class 5
0.8 W (29 dBm)
Class 1
1W (30 dBm)