GLOSSARY OF TERMS L

A  -  B C D E F  -  G H I J K L M

N O P Q R S T  -  U V W X Y Z

Landline - Traditional wired telephone service Lifeline/Link-Up Services - Programs that help qualified low-income households afford local telephone service. Lifeline assists with monthly telephone bills, and Link-Up assists with connection and installation charges. Local Access and Transport Area (LATA) - A contiguous local exchange area which includes every point served by a local phone company within an existing community of interest. It also serves as the dividing line for the allocation of assets and liabilities between AT&T and the Bell Operating Companies. LATAs were established by the Department of Justice as a result of the AT&T divestiture in 1983. Local Area Network (LAN) - A data communications system that (a) lies within a limited spatial area, (b) has a specific user group, (c) has a specific topology, and (d) is not a public switched telecommunications network, but may be connected to one. Note 1: LANs are usually restricted to relatively small areas, such as rooms, buildings, ships and aircraft. Note 2: An interconnection of LANs within a limited geographical area, such as a military base, is commonly referred to as a campus area network. An interconnection of LANs over a city-wide geographical area is commonly called a metropolitan area network (MAN). An interconnection of LANs over large geographical areas, such as nationwide, is commonly called a wide area network (WAN). Note 3: LANs are not subject to public telecommunications regulations. Local Call - 1. Any call using a single switching facility. Any call for which an additional charge, i.e., toll charge, is not made to the calling or called party. Local Exchange Carrier (LEC) - Any facilities-based and non-facilities-based ILEC and CLEC that provides basic local exchange services to consumers on a common carrier basis. Local Exchange Routing Guide (LERG) - Maintained by Telcordia (formerly BellCore) and is associated with the North American Number Plan (NANP). It tracks NPA/NXX assignments with appropriate switch routing. Local Loop - The copper/fiber wires running between the telephone subscriber' s home or business and the phone company switch. Local MultipointDistribution Services (LMDS) - This is a point/multipoint service with two-way capability to transmit voice, data and other video information. LMDS can offer innovative consumer services such as two-way interactive video, advanced teleconferencing, telemedicine, telecommuting and high-speed data services. Local Number Portability (LNP) - The ability of users of telecommunications services to retain, at the same location, existing telecommunications numbers without impairment of quality, reliability or convenience when switching from one telecommunications carrier to another. Long Run Service Incremental Cost (LRSIC) - Long-run service incremental cost (LRSIC) represents the forward-looking economic cost for a new or existing product that is equal to the per unit cost of increasing the volume of production from zero to a specified level, while holding all other product and service volumes constant. LRSIC does not include any allocation of forward-looking common overhead costs. Forward-looking common overhead costs are costs efficiently incurred for the benefit of a firm as a whole and are not avoided if individual services or categories of services are discontinued. Further, where appropriate, forward-looking joint costs, which are the forward-looking cost of resources necessary and used to provide a group or family of services shall be added to or included in the LRSIC of the product or service. Local Service Provider (LSP) - A term intended to encompass all companies providing dial tone to end users.

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