A circuit of nonlinear elements that restricts the electrical excursion of a variable in accordance with specified criteria.

Any process by which a specified characteristic (usually amplitude) of the output of a device is prevented from exceeding a predetermined value.
Note 1: Hard limiting ("clipping") is a limiting action in which there is (a) over the permitted dynamic range, negligible variation in the expected characteristic of the output signal, and (b) a steady-state signal, at the maximum permitted… (Read More →)

In radio transmission, the maximum permissible interference as specified in recommendations of the International Special Committee on Radio Interference or other recognized authority.

1. A physical medium for transferring electrical or electromagnetic energy from one point to another for purposes of communications.
2. A land line.
3. A metallic medium used for the transmission of electrical power.
4. A transmission medium, together with the associated equipment, required to provide the means of transporting information between two consecutive network elements, one of which originates… (Read More →)

See four-wire terminating set.

The code generated by a regenerator upon loss of input signal or loss of frame. The line AIS signal will maintain operation of the downstream regenerators and therefore prevent generation of unnecessary alarms. At the same time, data and orderwire communication is retained between the regenerators and the downstream line terminating equipment (LTE). [T1.105-1988]

The degree of electrical similarity of the two conductors of a transmission line.
Note: A high degree of line balance reduces pickup of extraneous disturbances of all kinds, including crosstalk.

Synonym building out.

A code chosen for use within a communications system for transmission purposes.
Note 1: A line code may differ from the code generated at a user terminal, and thus may require translation.
Note 2: A line code may, for example, reflect a requirement of the transmission medium, e.g., optical fiber versus shielded twisted pair.

[The] elimination of unintentional signals or noise induced or conducted on a telecommunications or information system signal, power, control, indicator, or other external interface line. [INFOSEC-99]