Uplink

The uplink is a term used in radiocommunicatons and satellite communications to denote the link from the end-user to the network or from the earth to the satellite. The link from the network to the end-user or from the satellite to the earth is called the downlink.

In networks based on fixed lines the terms downstream and upstream are used to denote the data flow from the network to the end-user and from the end-user to the network respectively.