JPEG

　　Joint Photographic Experts Group

　　JTM

　　job transfer manipulation

Key Telephone System (KTS)

　　KTS is an arrangement of multi-line telephones and associated equipment that permits the station user to depress buttons (keys) to access different central office or PBX lines, as well as to perform other functions. Typical functions include answering or placing a call on a selected line, putting a call on hold, using the intercom feature between phones at the same location, or activating a signal buzzer.

　　KSU

　　key service unit

　　KTS

　　key telephone system

　　Kbps - Kilobytes per second. A kilobyte equals a thousand bytes.

LAN (IEEE 802.3 10BaseT)

　　LAN (Local Area Network) is an Institute of Electrical and Electronic Engineers specification for a class of LANs using four-pair unshielded twisted pair (UTP) cable. See Local Area Network.

　　LAN

　　local area network

　　LATA

　　local access and transport area

　　LCR

　　least-cost routing

　　LDN

　　listed directory number; generally an organization's main telephone number that appears in the telephone book.

　　LDN

　　listed directory number

　　LEC

　　local exchange carrier

　　Line

　　See loop transmission facilities.

　　Local Access And Transport Area (LATA)

　　LATA is a geographic area (called an "exchange" or "exchange area" in the MFJ) within each BOC's franchised area that has been established by a BOC in accordance with the provisions of the MFJ for the purpose of defining the territory within which a BOC may offer its telecommunications services. In 1989, there were 198 LATAs, also referred to as market service areas (MSAs), in the United States.

　　Local Area Network (LAN)

　　LAN is a premises high-speed (typically in the range of 10 Mbps) data communications system wherein all segments of the transmission medium (typically coaxial cable, twisted pair or optical fiber) are contained within an office or campus environment.

　　Local Channel

　　In LEC tariffs, a local channel is the local loop that connects customer premises to serving LEC wire centers. In IXC tariffs, the network components (transmission, switching, other) used to connect customer premises to serving IXC POPs.

　　Loop Length

　　Typically, loop length is a complete electrical circuit; the pair of wires that winds its way from the central office to the telephone set or system at the customer's premises.

　　Loop Signaling

　　Loop signaling is a method of signaling over dc circuit paths that utilizes the metallic loop formed by the line or trunk conductors and terminating circuits.

　　Loop Start

　　Loop start is a supervisory signal given at a telephone or PBX in response to closing the loop's DC current path.

　　Loop Transmission Facilities

　　Loop transmission facilities connect switching systems to customer premises equipment throughout the serving area. A loop is a transmission path between a customer's premises and a LEC central office. The most common form of loop, a pair of wires, is also called a line. A loop" can be derived from digital loop carrier (DLC) systems also referred to as subscriber loop carrier (SLC) systems.

　　LSI

　　large-scale integrated circuit

　　LAN - Local Area Network. A data communications network that lies within a limited space (such as a building) to connect telephone lines, computers, modems, printers, etc.

　　Local Access and Transport Area (LATA) - Geographical boundaries within which local telephone companies may provide local telephone services (and some limited toll services). There are 184 LATAs in the United States.

　　Leased Line - A phone line dedicated for exclusive use from one location to another. High speed connections require a leased line.

　　Lifeline/Link-Up Program - A Federal program designed to provide telephone service to the poor and elderly at a reduced cost to assure they can be reached in case of an emergency.

　　Link - See Hypertext Link

　　LISTSERV - Mailing lists that act as newsgroups.

　　Local Number Portability Charge (LNP) - Allows a customer to keep the same phone number and "port" it over to another service provider. This is new to wireless. The terms number portability (NP) and local number portability (LNP) are often used interchangeably.

　　Local Number Portability Charge (LNP) - This charge may appear on the local portion of a phone bill if you live in an area where local number portability is provided. This fixed monthly charge allows local telephone companies to recover certain costs for providing "portability" to its customers. Local telephone companies may continue to assess this charge on their customers' telephone bills for five years from the date the local telephone company first began itemizing the charge on the bill. This is not a tax.

　　Login Name - The unique account name used to access a computer system. Also called user ID or user name, it is a way people identify themselves to their online service or Internet access provider.
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