1. [Network] A physical connection (electrical or optical) between two nodes of a network.
2. [Network] Two unidirectional fibers or conductors transmitting in opposite directions and their associated transmitters and receivers.
3. [Network] A collection of multiple lanes.
4. [Fibre Channel] The full-duplex FC-0 level association between FC-1 entities in directly attached ports.
5. [Fibre Channel] The point-to-point physical connection from one element of a Fibre Channel fabric to the next.