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An uplink (UL or U/L) is 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 inverse of a Downlink . An uplink or downlink is distinguished from Reverse Link or Forward Link .
  • Pertaining to Data Transmission from a data station to the headend.

  • Pertaining to GSM and cellular networks, the radio uplink is the transmission path from the Mobile Station (Cell Phone) to a Base Station (Cell Site). Traffic and signalling flows within the BSS and NSS may also be identified as uplink and downlink.



DOWNLINK

A downlink (DL) is the link from a Satellite to a ground station.

  • Pertaining to GSM and Cellular Networks, the radio downlink is the transmission path from a Base Transceiver Station (Cell Site) to the Mobile Station (Cell Phone). Traffic and signalling flows within the BSS and NSS may also be identified as uplink and downlink.



FORWARD LINK

A forward link is the link from a fixed location (e.g., a Base Station ) to a mobile user. If the link includes a Communications Relay Satellite , the forward link will consist of both an Uplink (base station to satellite) and a Downlink (satellite to mobile user).


REVERSE LINK

The reverse link (sometimes called a ''return link'') is the link from a mobile user to a fixed base station.

If the link includes a Communications Relay Satellite , the reverse link will consist of both an Uplink (mobile station to satellite) and a Downlink (satellite to base station) which together constitute a half Hop .
See Also: Backhaul (telecommunications)
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