Downlink

n. transmission channel that carries signals from a communications satellite or other airborne transmitter to a station on earth

Uplink An uplink (UL or U/L) is the portion of a communications link used for the transmission of signals from an Earth terminal to a satellite or to an airborne platform. An uplink is the inverse of a downlink. An uplink or downlink is distinguished from reverse link or forward link.Pertaining to data transmission from a data station to the headend.Pertaining to GSM and cellular networks, the radio uplink is the transmission path from the Mobile Station (Cell Phone) to a Base Station (Cell Site). Traffic and signalling flows within the BSS and NSS may also be identified as uplink and downlink.
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1. A data link from a satellite or other spacecraft to a terrestrial terminal . (188 ) 2. A data link from an airborne platform to a ground-based terminal.

part of a satellite transmission in which signals are sent from the satellite to earth.