Glossary:

ATIS Telecom Glossary

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Expected Measured Loss (EML)

The term "Expected Measured Loss" denotes a calculated loss which specifies the end-to-end 1004-Hz loss on a terminated test connection between two readily accessible manual or remote test points. It is the sum of the inserted connection loss and test access loss including any test pads.

expedited data unit

In layered systems, a service data unit that is delivered to a peer entity in the destination open system before the delivery of any subsequent service data unit sent on that connection.

experimental station

A station utilizing radio waves in experiments with a view to the development of science or technique. This definition does not include amateur stations. [NTIA] [RR]

expert system (ES)

A computer system that facilitates solving problems in a given field or application by drawing inference from a knowledge base developed from human expertise.
Note 1: The term "expert system" is sometimes used synonymously with "knowledge-based system," although it is usually taken to emphasize expert knowledge.
Note 2: Some expert systems are able to improve their knowledge base and develop… (Read More →)

explicit congestion message

A message generated by the network and sent to the user terminal to indicate a congestion condition. [T1.615-1992]

explicit services

Services that can be accessed from an application program, via an API, and are generally provided only when requested [POSIX.0].

exploitable channel

1. [A] Channel that allows the violation of the security policy governing an information system (IS) and is usable or detectable by subjects external to the trusted computing base. [INFOSEC-99]
2. Any channel that is usable or detectable by subjects external to the Trusted Computing Base.

exposed facilities

Any outside plant facilities subject to the effects of lightning; or to power contacts, power induction, or differences in ground potential any of which exceed 300 Vrms to ground. [T1.316-1997]

exposure

In INFOSEC, the potential compromise associated with an attack exploiting a corresponding vulnerability. [2382-pt.8]

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