电信专业英英词典L-1

（单词翻译:单击）

　　LAN (IEEE 802.3 10BaseT)

　　LAN (Local Area Network) is an Institute of Electrical and Electronic Engineers specification¹ 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 geographic² area (called an "exchange" or "exchange area" in the MFJ) within each BOC's franchised³ 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 premises⁴ 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 tariffs⁵, a local channel is the local loop that connects customer premises to serving LEC wire centers. In IXC tariffs, the network components⁶ (transmission, switching, other) used to connect customer premises to serving IXC POPs.