A facility that provides access to communications for a user or group of users isolated from a central communications node.

A terminal that is added to an existing terminal and that uses the same circuit and address, i.e., port and number, as the terminal to which it is added.

A set of external entities to the application platform with which information is exchanged. External entities include people, exchangeable media that is not mounted in the platform, communication wiring, and all other platforms [POSIX.0].

The interface between the application platform and the external environment across which information is exchanged. The External Environment Interface is defined primarily in support of system and application interoperability. The primary services present at the External Environment Interface comprise: Human/Computer Interaction Services, Information Services, Communication Services [POSIX.0].

In a given communications system, a timing reference obtained from a source, such as a navigation system, external to the given system.
Note: External timing references are usually referenced to Coordinated Universal Time .

A plug-in, add-on, or helper application used with a Web browser to present graphics, audio, or video files.
Note: For example, an external-viewer program could allow the presentation of nonstandard graphics and audio files.

The sum of the absorption coefficient and the scattering coefficient. [From Weik '89]

The ratio of two optical power levels, of a digital signal generated by an optical source, e.g., a laser diode, where P1 is the optical power level generated when the light source is "on," and P2 is the power level generated when the light source is "off. "
Note: The extinction ratio may be expressed as a fraction or in… (Read More →)

Synonym added bit.

Synonym added block.