“Channel (1) A communication path. Multiple channels can be multiplexed over a single cable in certain environments. The term is also used to describe the specific path between large computers and attached peripherals. (2) In the case of fiber optic-based transmission systems, an electrical or photonic communications path, between two or more points of termination. (3) The smallest subdivision of a circuit that provides a type of communication service, usually a path with only one direction. (4) A communications path, or the signal sent over that channel.”