To perform satellite communications are used two types of communication, the first is on the upward link (Uplink), in which the transfer is made of a central land for the satellite, and the second is on the downward link (Downlink), in which is the transmission of the satellite to a central land.
Usually the bands of frequencies used for the journey downward are lower than those used in the upward path. This is in order to reduce possible interference and because the downward path is considered more critical that the upward due to the limitations of power the satellite. The fact of the frequency band of the ascending path be higher also allows maximize the gain of receipt, as the noise captured by the satellite is high.
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