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  • 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.

Source: Wikipedia, Google