A network interface card (NIC) designed to attach a client workstation to a token ring computer network and operate as a token-passing interface.

A bus network in which a token passing procedure is used.

See network topology.

The permissible range of variation of some characteristic from its nominal value.

The region between two curves, such as circles or rectangles, used to specify the tolerance on component size and geometry. 2. Pertaining to the cross section of an optical fiber, when used to specify the respective diameters and ovalities of, and concentricity error between, the core and cladding; two concentric annular regions which define the core-cladding boundary and the cladding… (Read More →)

See long-distance call.

An office (or group of offices) within a city which generally handles the originating and incoming toll traffic for that city to or from other toll center areas and which handles through switched traffic. The toll center normally handles the inward toll traffic for its tributary exchanges and, in general, either handles the outward traffic originating at its tributaries or… (Read More →)

The areas served by a toll center, including the toll center city and the communities served by tributaries of the toll center. [47 CFR Pt.36-A]

A toll office (as contrasted to a local office) in a toll center city. [47 CFR Pt.36-A]

A general term applied to interexchange trunks used primarily for toll traffic. [47 CFR Pt.36-A]