1. In analog computing, a functional unit that compares two analog variables and indicates the result of that comparison.
2. A device that compares two items of data and indicates the result of that comparison.
3. A device for determining the dissimilarity of two items such as two pulse patterns or words.

1. The division of data into isolated blocks for the purpose of reducing risk; e.g., the isolation of the operating system, application software , and files from one another in a storage device in order to provide protection against unauthorized or concurrent access. [After 2382-pt.8]
2. A nonhierarchical grouping of sensitive information used to control access to data more finely… (Read More →)

The segregation of components, programs, and information to provide isolation.
Note: Compartmentation provides some protection against overall compromise, contamination, or unauthorized access.

1. [An] information systems (IS) mode of operation wherein each user with direct or indirect access to a system, its peripherals, remote terminals, or remote hosts has all of the following: (a) valid security clearance for the most restricted information processed in the system; (b) formal access approval and signed nondisclosure agreements for that information [to] which a user is… (Read More →)

Capability of two or more items or components of equipment or material to exist or function in the same system or environment without mutual interference. [JP 1-02]

Testing to be carried out to validate proper interworking of interconnecting network facilities and equipment. Compatibility tests are performed prior to cutover to validate functional capabilities and services provided over the interconnections. [T1.234-1993]

Independent sideband transmission in which the carrier is deliberately reinserted at a lower level after its normal suppression to permit reception by conventional AM receivers.
Note: Compatible sideband transmission is usually single-sideband (SSB) amplitude-modulation-equivalent (AME) transmission consisting of the emission of the carrier plus the upper sideband. Synonym amplitude modulation equivalent.

Signaling in which the transmission of each signal in the forward direction from an originating terminal is inhibited until an acknowledgement of the satisfactory receipt of the previous signal is received by the originating terminal.

A company that provides exchange access services in competition with an established U. S. telephone local exchange carrier.

In time-assignment speech interpolation (TASI) or digital speech interpolation (DSI), truncation of the initial part of a speech spurt, caused when all channels in a given direction of transmission are busy and the transmission of the spurt must wait for an available channel.