电信专业英英词典L-1_电脑电信

　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.