In data communication, a communication channel is the medium through which this electronic information travels from source location to destination location. This communication channel may use the wireline medium or wireless medium, whichever is required.
Wireline channels physically connect transmitter to receiver with a “wir&’ which could be a twisted pair, coaxial cable or optic fiber. Consequently, wireline channels are more private and much less prone to interference. Simple wireline channels connect a single transmitter to a single receiver e.g. a point-to-point connection as with the telephone. Some wireline channels operate in broadcast modes e.g. one or more transmitter is connected to several receivers. One simple example of this situation is cable television.
Wireless channels are much more public, with a transmitter’s antenna radiating a signal that can be received by any antenna sufficiently close enough. In contrast to wireline channels where the receiver takes in only the transmitter’s signal, the receiver’s antenna will react to electromagnetic radiation coming from any source. This feature has two faces: The smiley face says that a receiver can take in transmissions from any source, while the frowny face says that interference and noise are much more prevalent than in wireline situations.
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