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.
Half-Life: Uplink, the demo version of the Half-Life 1 first-person shooter
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Cassini's commands are sent through computer control, which vary the phase of the uplink and, like a remote control, send the information to the spacecraft in the form of pulses.
Uplink is a general term given to radio signals sent "up" from Earth to a spacecraft.
The uplink usually sent to Cassini is a highly directional, microwave radio beam in a frequency range called X-band.