What is uplink and downlink design?

The uplink frequency is the frequency which is used for transmission of signals from earth station transmitter to the satellite. The downlink frequency is the frequency which is used for transmission of signals from the satellite to the earth station receiver.

The communication going from a satellite to ground is called downlink, and when it is going from ground to a satellite it is called uplink . When an uplink is being received by the spacecraft at the same time a downlink is being received by Earth, the communication is called two-way.

We know the basics of satellite communication that signals from the ground station present on the surface of the earth is transmitted towards the satellite. … So, uplink denotes the transmission of radio waves from an earth station to satellite and downlink corresponds to the transmission from satellite to earth station.