Deprecated term. See insertion loss.
Note: Excess insertion loss was used to indicate that, in an optical-fiber coupler, the loss occasioned by dividing the input power among the ports is not the total insertion loss.

1. A room or building equipped so that telephone lines terminating there may be interconnected as required.
Note: The equipment may include manual or automatic switching equipment.
2. In the telephone industry, a geographic area (such as a city and its environs) established by a regulated telephone company for the provision of local telephone services.
3. In the Modification of… (Read More →)

In telephone networks, access in which exchange services are provided for originating or terminating interexchange telecommunications within the exchange area.

A geographic area served by one or more central offices within which local telephone service is furnished under regulation.

Information exchanged between a claimant and a verifier during the process of authenticating a principal.

1. A carrier authorized to provide telecommunication services within one or more access service areas. [T1.104-1988]
2. A company that provides telecommunications within a LATA (United States) or province (Canada). In Canada, ECs also provide telecommunications among Canadian carriers. [T1.209-1998]

A unique four-character alphabetic code that identifies the legal company name shall be assigned, as appropriate, to represent each exchange carrier.

The facilities included within a local access and transport area.

Synonym subscriber line.

This is a combination of (a) exchange cable and wire facilities (b) exchange central office circuit equipment, including associated land and buildings and (c) information origination/termination equipment which forms a complete channel. [47 CFR Pt.36-A]