General telecom

General telecom

Terms relating to telecommunication or communication through technological means.

Industry: Telecommunications

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General telecom

Polarential telegraph system

Telecommunications; General telecom

A direct-current telegraph system employing polar transmission in one direction and a form of differential duplex transmission in the other. Note: Two types of polarential systems, known as types A ...

Rhombic antenna

Telecommunications; General telecom

A directional antenna that is composed of long-wire radiators that form the sides of a rhombus, the two halves of which are fed equally in opposite phase at one apex. Note: A rhombic antenna is ...

Directory access protocol (DAP)

Telecommunications; General telecom

A directory protocol that defines the exchange of requests and outcomes between user and system.

Performance anomalies

Telecommunications; General telecom

A discrepancy between actual and desired characteristics of an item. An anomaly may or may not affect the ability of an item to perform a required function.

Security function

Telecommunications; General telecom

A discrete aspect of the performance of a system by which it enforces security automatically on behalf of the System Manager and /or system users. Note: Access control, authentication, accounting and ...

Photon

Telecommunications; General telecom

A discrete packet, i.e., quantum, of electromagnetic energy. Note: The energy of a photon is h, where h is Planck's constant and is the frequency of the electromagnetic wave.

Digital versatile disc (DVD)

Telecommunications; General telecom

A disk, recorded with optical technology, that contains full-length (2-hour) motion pictures for viewing on a personal computer or on a TV screen (through a set-top box. ) Note: A dvd drive can also ...