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Line 1: {{Short description\|Communication channel between two or more devices}} {{Use British English\|date=April 2020}} In a [[telecommunications network]], a '''link''' is a [[communication channel]] that connects two or more devices for the purpose of [[data transmission]]. The link may be a dedicated [[Data link\|physical ~~lincuk~~link]] or a [[virtual circuit]] that uses one or more physical links or shares a physical link with other telecommunications links. A telecommunications link is generally based on one of several types of information transmission paths such as those provided by [[communication satellite]]s, terrestrial [[radio communications]] infrastructure and [[computer network]]s to connect two or more points. Line 37: {{redirect\|Uplink}} Pertaining to [[radiocommunication service]], an '''uplink''' (UL or U/L) is the portion of a [[feeder link]] used for the transmission of signals from an [[earth station]] to a [[space radio station]], [[space radio system]] or [[high altitude platform station]]. Pertaining to [[~~Global System for Mobile Communications\|~~GSM]] and cellular networks, the radio uplink is the transmission path from the [[mobile station]] (cell phone) to a [[base transceiver station\|base station]] (cell site). Traffic and signalling flowing within the [[Base Station Subsystem\|BSS]] and [[Network and Switching Subsystem\|NSS]] may also be identified as uplink and downlink. Pertaining to computer networks, an uplink is a connection from [[data communications equipment]] toward the [[network core]]. This is also known as an [[upstream (networking)\|upstream]] connection. === Downlink === Pertaining to [[radiocommunication service]], a '''downlink''' (DL or D/L) is the portion of a [[feeder link]] used for the transmission of signals from a [[space radio station]], [[space radio system]] or [[high altitude platform station]] to an [[earth station]]. In the context of [[~~Communications satellite\|~~satellite communications]], a '''downlink''' (DL) is the link from a satellite to a [[ground station]]. Pertaining to [[cellular network]]s, the radio downlink is the transmission path from a [[cell site]] to the [[cell phone]]. Traffic and signalling flowing within the [[base station subsystem]] (BSS) and [[network switching subsystem]] (NSS) may also be identified as uplink and downlink. *Pertaining to [[computer network]]s, a downlink is a connection from data communications equipment toward [[data terminal equipment]]. This is also known as a [[downstream (networking)\|downstream]] connection.