Synonym frequency-exchange signaling.

In telegraphy systems, keying in which the modulating wave causes the carrier to be modulated with a single tone for the "mark" and modulated with a different single tone for the "yyspace. "

See two-tone keying.

Synonym half-duplex operation.

Synonym duplex operation.

Also 2-wire circuit. A full-duplex communications circuit that utilizes only two metallic conductors, e.g., a single twisted pair.

Acronym for teletypewriter exchange service.

Abbreviation for transmitter, transmit, Transmit Diversity.

A wireless SP that utilizes Type 1 (trunk side with line treatment) interconnection with another SP's end office switch.

Classified or controlled cryptographic item for securing classified and sensitive U. S. Government information, when appropriately keyed. The term refers only to products, and not to information, key, services, or controls. Type 1 products contain classified algorithms. They are available to U. S. Government users, their contractors, and federally sponsored non-U. S. Government activities subject to export restrictions in accordance… (Read More →)