a software communications path between main memory and a single peripheral device
Multiplexed channel or frame relay/frame switched media, where no physical wire/fiber/radio/coax path exists, but with in a protocol stack a communications path exists.
In X.25 communications, a means of two-way simultaneous transmissions across a data link, comprising associated send and receive channels. A logical channel can represent the path that data travels from its origin to the network or from the network to its destination.