Downlink

In the context of satellite communications, a downlink (DL) is the link from a satellite to a ground station.
Pertaining to cellular networks, the radio downlink is the transmission path from a cell site to the cell phone. Traffic and signalling flows within the base station subsystem (BSS) and network switching subsystem (NSS) may also be identified as uplink and downlink.
Pertaining to computer networks, a downlink is a connection from data communications equipment towards data terminal equipment. This is also known as a downstream connection.