Glossary:

ATIS Telecom Glossary

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demultiplexing

The separation of two or more channels previously multiplexed; i.e., the reverse of multiplexing.

denial of service (DoS)

1. The prevention of authorized access to resources or the delaying of time-critical operations. [2382-pt.8]
2. The result of any action or series of actions that prevents any part of an information system (IS) from functioning. [INFOSEC-99]
3.
1. The unauthorized withholding of information or resources [CESG].
4. The prevention of legitimate access.
Note: This may result from either accidental… (Read More →)

dense binary code

A binary code in which all possible bit patterns that can be made from a fixed number of bits are used to encode user information but no overhead information.
Note: Examples of dense binary codes are (a) a pure binary representation for sexadecimal digits using all sixteen possible patterns and (b) an octal representation using all eight patterns. A binary… (Read More →)

dense wavelength division multiplexing (DWDM)

Multiplexing using close spectral spacing of individual optical carriers (wavelengths) to take advantage of desirable transmission characteristics (e.g., minimum dispersion or attenuation) within a given fiber, while reducing the total fiber count needed to provide a given amount of information-carrying capacity. [FAA]

density

1. In a facsimile system, a measure of the light transmission or reflection properties of an area of an object.
Note 1: Density is usually expressed as the logarithm to the base 10 of the ratio of incident to transmitted or reflected irradiance.
Note 2: There are many types of density, such as diffuse, double diffuse, and specular density, each… (Read More →)

departmental security officer

The person responsible to the Permanent Head of a Government Department for establishing and enforcing Departmental Security policy; this includes the application of minimum standards of security and system accreditation [CESG].

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