Downlink

All you want to know about Downlink

"Uplink" redirects here. For the 2001 computer game by Introversion software, see Uplink (computer game). For the Half-Life demo, see Half-Life: Uplink.

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Uplink

Look up uplink in
Wiktionary, the free dictionary.

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 (see below).

  • 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

Look up downlink in
Wiktionary, the free dictionary.

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

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) and Return channel

Sources

Retrieved from "http://en.wikipedia.org/wiki/Telecommunications_link#Downlink"

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