电信专业英英词典H-1(在线收听

 

  Half Duplex

  Half duplex is a transmission path capable of transmitting signals in both directions, but only in one direction at a time.

  HDLC

  high-level data link control

  Header

  The header is control information appended to a segment of user data for control, synchronization, routing and sequencing of a transmitted data packet or frame.

  Hertz (Hz)

  Hertz is the measurement that distinguishes electromagnetic waveform energy; number of cycles, or complete waves, that pass a reference point per second; measurement of frequency, by which one hertz equals one cycle per second.

  Horizontal Wiring

  In a premises distribution system, horizontal wiring is the connection between the telecommunications outlet in work areas and the telecommunications closet.

  Hub

  In local area networks (LANs), a hub is a wiring concentrator equipment used in hierarchical star physical wiring topologies. Those directly connected to terminals or other user devices are of ten referred to as local hubs or concentrators. Central hubs are those at the highest hierarchical level. Hubs often provide the means for interconnecting 10BaseT, coaxial or fiber optic cable LAN segments. Intelligent hubs may implement multiport bridging and network management functions.

  HVAC

  heating, ventilation and air conditioning

  Home Page - The Web document that your browser displays when you access a site - typically the main page of a Web site.

  Host - A computer directly connected to the Internet. Also refers to a computer on a network that provides services to other computers on the network.

  HTML - See HyperText Markup Language

  HyperText Link - A connection between two Web documents; usually underlined text or a graphic that you click on to display another Web document.

  HyperText Markup Language (HTML) - The basic coding language used to create WWW documents.

  HyperText Transport Protocol (HTTP) - The protocol for moving HyperText files across the Internet

  HTTP - See HyperText Transport Protocol

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