1. A period during which a telecommunications service remains in an operational state.
Note: The operational state must be defined in accordance with specified criteria.
2. A performance measurement period, or succession of performance measurement periods, during which a telecommunications service remains in an operational service state.
Note: An operational service period begins at the beginning of the performance measurement… (Read More →)

During any performance measurement period, a telecommunications service condition that existed when the calculated values of specified performance parameters were equal to or better than their associated outage thresholds.

The term denoting the general classifications of services rendered to the public for which separate tariffs are filed, namely exchange, state toll and interstate toll. [47 CFR Pt.36-A]

Code composed largely of words and phrases suitable for general communications use. [INFOSEC-99]

[The] process denying to potential adversaries information about capabilities and/or intentions by identifying, controlling and protecting generally unclassified evidence of the planning and execution of sensitive activities. [NIS]

[The] Process denying information to potential adversaries about capabilities and/or intentions by identifying, controlling, and protecting unclassified generic activities. [INFOSEC-99]

A system that performs operations system functions (OSFs), that is, supports the processing of information related to operations, administration, maintenance, and provisioning for the telecommunications networks.
Note: An operations system performs surveillance and testing functions to support customer access maintenance. [After T1.210-1989]

The functional entity that provides access to an operator service from an exchange in the network. The operator service may be co-located with the exchange or located elsewhere. [T1.661-1997]

The company accepting the billing information, initiating the validation process, and recording the details of the call.

A set of services including toll and assistance, listing services and intercept, associated with the originating connection network capability. [After T1.661-1997]