(1) The transmission from an earth station up to a satellite. Contrast with downlink.
(2) The transmission from a cellphone or other mobile device to a cell tower. Contrast with downlink.
(3) A port on a network device that is used to connect to another network device rather than to a client or server. See MDI port.
An Uplink Port
Ethernet switches typically have an uplink port for connecting to another switch or hub.
