Modulation in which there is on-off keying of a continuous wave.

Synonym isochronous burst transmission.

Synonym interrupt.

A system that monitors a pilot for interruptions on frequency division multiplexing (FDM) systems and that transmits an indication to the switching equipment. [T1.110-1987]

A single direct transmission channel, e.g., voice-frequency circuit, between switching nodes.

1. In a digital transmission system, distortion of the received signal, which distortion is manifested in the temporal spreading and consequent overlap of individual pulses to the degree that the receiver cannot reliably distinguish between changes of state, i.e., between individual signal elements.
Note 1: At a certain threshold, intersymbol interference will compromise the integrity of the received data.
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Circuits between toll centers and circuits between a toll center and a tandem system in a different toll center area. [47 CFR Pt.36-A]

A single direct transmission channel, e.g., voice-frequency circuit, between two toll offices.

Mechanisms that mask differences in physical, link, and network technologies by converting (or mapping) states and protocols into consistent network and user services. [After T
1. Rpt34-1994]

Within the boundaries of a local access and transport area (LATA).