User manual

9-2 N9360A Multi UE Tester GSM User Manual
9 Appendix B General Information in 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 ms
each) using the method called Time Division Multiple Access
(TDMA) on Absolute RF Channels (ARFCNs) spaced 200 kHz
apart.
RF Channels
Table 9-1 shows the RF channel frequencies and channel
numbers for each radio standard.
Power Classes
The power classes are defined as follows:
Table 9-1 RF Channels
GSM850 GSM900 DCS1800 PCS1900
Uplink 824.2 to 848.8 MHz 890.2 to 914.8 MHz
876.2 to 889.8 MHz
1710.2 to 1784.8 MHz 1850.2 to 1909.8 MHz
Downlink 869.2 to 893.8 MHz 935.2 to 959.8 MHz
921.2 to 934.8 MHz
1805.2 to 1879.8 MHz 1930.2 to 1989.8 MHz
ARFCN Range 128 to 251 0 to 124
955 to 1023
512 to 885 512 to 810
Table 9-2 Power Classes
12345
GSM850, GSM900 +39 dBm +37 dBm +33 dBm +29 dBm
DCS1800 +30 dBm +24 dBm +36 dBm
PCS1900 +30 dBm +24 dBm +33 dBm