Downlink

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

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.