[A] prearranged procedure in which a subject requests authentication of another, and the latter establishes validity with a correct reply. [INFOSEC-99]

The procedure of transferring signaling traffic from alternative signaling link(s) to the signaling link which has become available as a result of having been restored, uninhibited, or unblocked. This procedure performs actions opposite to changeover. [T1.226-1992]

The procedure of transferring signaling traffic from one signaling link to one or more different signaling links, when the link in use fails or is required to be cleared of traffic. [T1.110-1987]

1. A connection between initiating and terminating nodes of a circuit.
2. A single path provided by a transmission medium via either (a) physical separation, such as by multipair cable or (b) electrical separation, such as by frequency- or time-division multiplexing.
3. A path for conveying electrical or electromagnetic signals, usually distinguished from other parallel paths.
4. Used in conjunction… (Read More →)

The part of a carrier-multiplex terminal that performs the first step of modulation by multiplexing a group of channels into a higher bandwidth analog channel or higher bit-rate digital channel and, conversely, demultiplexes these aggregates back into individual channels.

Binary data transmitted over a communications link.
Note: Channel bits are derived from user information by FEC (forward error correction) coding and interleaving.

1. The maximum possible information transfer rate through a channel, subject to specified constraints.
2. The rate at which information may be transmitted through a channel.
Note: Usually measured in bits per second [CESG].

A device for connecting a channel to a highway, or a highway to a channel, at specified times.

1. The ratio of the channel noise at any point in a transmission system to an arbitrary level chosen as a reference.
Note 1: The channel noise level may be expressed in (a) dB above reference noise (dBrn), (b) dB above reference noise with C-message weighting (dBrnC), or (c) adjusted dB (dBa).
Note 2: Each unit used to measure channel… (Read More →)

The constant frequency difference between a channel frequency and a reference frequency which may frequency hop.