downlink vs uplink

downlink

verb
  • To transmit a signal from a satellite to a terrestrial receiving station. 

noun
  • Transmission of data from a network, usually wireless, to the user. 

  • The transmission of a signal from a satellite to a receiving station on earth; or the means of this transmission. 

uplink

verb
  • To transmit a signal by means of an uplink. 

noun
  • The communication path from a mobile device to a base station, a consumer to the network backbone, a client device to a server etc. 

  • The portion of a communications link used for the transmission of signals from an Earth terminal to a satellite or to an airborne platform. An uplink is the converse of a downlink. An uplink or downlink is distinguished from reverse link or forward link. 

  • Data transmission from a data station to the headend. 

How often have the words downlink and uplink occurred in a corpus of books? (source: Google Ngram Viewer )