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General Information on the GSM System
The GSM System
The GSM System
A GSM mobile phone transmits speech as bursts of encoded data. An RF carrier is
modulated by the special form of frequency modulation known as the Gaussian
Minimum Shift keying (GMSK). Signals are transmitted in short bursts (577 s
each) using the method called Time Division Multiple Access (TDMA) on
Absolute RF Channels (ARFCNs) spaced 200 kHz apart.
RF Channels
The next table shows the RF channel frequencies and channel numbers for each
radio standard.
Power Classes
The power classes are defined as follows:
184
GSM900
890.2 to
Uplink
914.8 MHz
935.2 to
Downlink
959.8 MHz
1 to 124
ARFCN
Range
GSM900, E-GSM
+30 dBm
DCS1800
+30 dBm
PCS1800
E-GSM
880.2 to
914.8 MHz
925.2 to
959.8 MHz
0 to 124,
975 to 1023
1
2
+39 dBm
+37 dBm
+24 dBm
+36 dBm
+24 dBm
+33 dBm
DCS1800
PCS1900
1710.2 to
1850.2 to
1784.8 MHz
1909.8 MHz
1805.2 to
1930.2 to
1879.8 MHz
1989.8 MHz
512 to 885
512 to 810
3
4
+33 dBm
+29 dBm
Appendix A
5
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