In telephone systems, the extent to which circuits pick up noise and low-frequency energy by induction from power systems.
Note: Susceptiveness depends on telephone circuit balance, wire and connection transpositions, wire spacing, and isolation from ground.

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A technique whereby the frequency of the local oscillator is slowly swept past the reference in order to assure that the pull-in range is reached.

Jamming in which (a) a narrow frequency band of jamming energy is repeatedly swept over a relatively wide frequency band, (b) the sweep rate is such as to be on any given frequency only long enough to accomplish its jamming task, returning to that frequency again before the expiration of the jammed circuit recovery time.
Note 1: Sweep jamming combines… (Read More →)

Slow, graceful, undesired movements of display elements, groups, or images about their mean position on a display surface, such as that of a monitor.
Note 1: Swim can be followed by the human eye, whereas jitter usually appears as a blur.
Note 2: Jitter, swim, wander, and drift have increasing periods of variation in that order.

1. In communications systems, a mechanical, electro-mechanical, or electronic device for making, breaking, or changing the connections in or among circuits.
2. Deprecated synonym for central office, switching center.
3. In communications systems, to transfer a connection from one circuit to another.
4. In a computer program, a conditional instruction and a flag that is interrogated by the instruction.
5.… (Read More →)

In telephony, the busy hour for a single switch.

Equipment used for manual switching operations.

A communication path between local exchange and a customer interface (CI). [T1.401-1988]