電信專業(yè)英英詞典L

1、電信專業(yè)英英詞典LLAN (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.LANlocal area networkLATAlocal access and transport areaLCRleast-cost routing

2、LDNlisted directory number; generally an organization's main telephone number that appears in the telephone book.LDNlisted directory numberLEClocal exchange carrierLineSee loop transmission facilities.Local Access And Transport Area (LATA)LATA is a geographic area (called an "exchange"

3、 or "exchange area" in theMFJ) within each BOC's franchised area that has been established by a BOCin accordance with the provisions of the MFJfor the purpose of defining the territory within which a BOCmay offer its telecommunications services. In 1989, there were 198 LATAs, also refe

4、rred 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 with

5、in an office or campus environment.Local ChannelIn 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 LengthTypi

6、cally, 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 SignalingLoop signaling is a method of signaling over dc circuit paths that utilizes the metallic loop formed by the li

7、ne or trunk conductors and terminating circuits.Loop StartLoop start is a supervisory signal given at a telephone or PBX in response to closing the loop's DC current path.Loop Transmission FacilitiesLoop transmission facilities connect switching systems to customer premises equipment throughout

8、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) syst

9、ems.LSIlarge-scale integrated circuitLAN - 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 telephon

10、e companies may provide local telephone services (and somelimited 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 de

11、signed 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 LinkLISTSERV - Mailing lists that act as newsgroups.Local Number Portability Charge (LNP) - Allows a customer to keep the same phone number and &qu

12、ot;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 whe

13、re 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