GSM frequencies include 2 bands at 900 MHz and 1800 MHz.
GSM 900:
124 Radio Carriers, assigned in two sub bands of 25 MHz in 890 – 915 MHz and 935-960MHz ranges, channel widths 200kHz.
Each carrier is divided into frames of 8 time slots, frame duration 4.6ms.
DCS-1800:
2 sub bands of 75MHz in 1710 – 1785 MHz and 1805-1880MHz.
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