The entity designated to manage and administer Toll-Free Numbers for Toll-Free Subscribers within the 800 Service Management System (SMS/800).

Ability of an entity to provide service within the required time.
Note: The term timeliness is sometimes used incorrectly to mean responsiveness.

In a photodetector, the ratio of the electrical output to the optical input.
Note 1: Responsivity is usually expressed in amperes per watt, or volts per watt, of incident radiant power.
Note 2: Responsivity is a function of the wavelength of the incident radiation and the bandgap of the material of which the photodetector is made. Deprecated synonym sensitivity.

The resumption of the execution of a computer program using the data recorded at a checkpoint.

A series of significant conditions determined by the decisions taken according to the products of the demodulation process.

The bound on performance that is allowed when corrective action is taken to restore a parameter after an IAL (immediate action limit) failure. Performance as measured by a parameter is satisfactory if the value of the parameter is equal to or better than the limit. [T1.506-1989]

Of an impaired (degraded) or unserviceable telecommunications service or facility, action taken to repair it and return it to service.
Note: Permanent or temporary restoration may be accomplished by various means, such as patching, rerouting, substitution of component parts, etc.

Describes supremacy given to some Government and National Security circuits.

A class of service in which users may be denied access to one or more of the system features or operating levels.

Synonym controlled space.