C

carrier

A (usually) continuous sinusoidal signal, applied to a communications medium, which does not convey information until altered in some fashion, such as having its amplitude changed (amplitude modulation), its frequency changed (frequency modulation), or its phase changed (phase modulation). The changes convey the information.

carrier detect circuitry

Electronic components arranged to detect the presence of a carrier signal ? thus detect that a transmission medium is in use and/or that data is being transmitted.

CATV

Community antenna television, a method of delivering quality television reception by taking signals from a well-situated central antenna and delivering them to people?s homes by means of a coaxial cable network. The electrical components for such systems can also be used to create broadband local area networks.

circuit switching

A method of allowing telephones or data stations to establish a connection on a temporary basis. When the connection has been established, the two stations appear to be connected by a piece of wire, as the full bandwidth of the wire used to reach the switching system is available between the stations, and there is no noticeable delay in the transmission of voice or data between the stations.

channel banks

Collections of electronic circuitry used at each end of time-division-multiplex transmission systems to divide the available bandwidth in the transmission system into separate channels and to provide control of those channels.

coaxial cable

A type of electrical cable in which a piece of wire is surrounded by insulation and then surrounded by a tubular...

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