How do you characterize uplink and downlink?

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Two frequencies are necessary for communication between a ground station and a satellite; one for communication from the ground station on the earth to the satellite called uplink frequency and another frequency for communication from the satellite to a station on the earth, called downlink frequency. These frequencies, reserved for satellite communication, are divided in several bands such as L, S, Ku, etc are in the gigahertz (microwave) frequency range as shown in Table. Higher the frequency, higher is the available bandwidth. 


Band Downlink Frequency (GHz) Uplink Frequency (GHz) Bandwidth (MHz)
L 1.51.6 15
S1.9 2.2 70
C 4 6500
Ku 11 14 500
Ka 20 30 3500


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