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Uplink and downlink are frequencies
Communication from earth station to satellite in uplink and communication from satellite to earth station is downlink
Always uplink freq.>downlink freq.
GSM 900:
Uplink frequency: 890 - 915 MHz
GSM 1800 :
Uplink frequency: 1710 - 1785 MHz
GSM 1900:
Uplink frequency: 1850 - 1910 MHz
Uplink translates also to Upload - where you send data to another destination.
uplink frequency-1710-1785MHz
downlink frequency-1805-1880
Uplink frequency is a frequency that goes from the ground to the satellite. Downlink frequency goes from the satellite to the ground.