A unique three-character alphabetic code that identifies customers receiving services from exchange carriers.

1. (or IC):
1. A communications common carrier authorized to provide interexchange telecommunications services within world zone 1 using the North American numbering plan. [After T1.104-1988]
2. A telecommunications common carrier authorized to provide telecommunications services between LATAs. [After T1.502-1988] [T1.508-1998]
Note: The term "interexchange carrier" is also used to refer to any other entity that connects to the exchange… (Read More →)

A circuit which is included in the interexchange transmission equipment. [47 CFR Pt.36-A]

The combination of (a) interexchange cable and wire facilities, (b) interexchange circuit equipment and, (c) associated land and buildings. [47 CFR Pt.36-A]

1. In a system , a shared boundary, i.e., the boundary between two subsystems or two devices.
2. A shared boundary between two functional units, defined by specific attributes, such as functional characteristics, common physical interconnection characteristics, and signal characteristics.
3. A point of communication between two or more processes, persons, or other physical entities.
4. A point of interconnection… (Read More →)

The parameter within a primitive that is the unit of information transferred to/from the upper layer or sublayer in a single interaction. [T1.629-1999]

In telephony, the characteristic of interfaces that allows them to support transmission, switching, and signaling functions identical to those used in the enhanced services provided by the carrier.
Note: As part of its comparably efficient interconnection (CEI) offering, the carrier must make available standardized hardware and software interfaces that are able to support transmission, switching, and signaling functions identical to… (Read More →)

A processor-controlled switch used in packet-switched networks to route packets to their proper destination.

In integrated services digital networks (ISDN), the part of the bit stream through a framed interface used for telecommunications services and signaling.

Synonym point of interface.