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Frequency in GSM system

pintu.sadhu Platinum Medal

(1)
6 years 7 months ago View: 647 Reply: 5

System	GSM 900	GSM 1800	GSM 1900
Uplink	890-915 MHz	1710-1785 MHz	1850-1910 MHz
Downlink	935-960 MHz	1805-1880 MHz	1930-1990 MHz
Wavelength	33 cm	~ 17 cm	~ 16 cm
Bandwidth	25 MHz	75 MHz	60 MHz
Duplex Distance	45 MHz	95 MHz	80 MHz
Radio Channels	125	375	300

In GSM system, Carrier Separation is 200 kHz and Transmission Rate is 270 kbits/s.

To avoid interface between uplink and downlink frequency, distance is maintained between uplink and downlink frequencies. The difference is called Duplex Distance.