September 2005

  • anti-replay protocol

    The anti-replay protocol is part of the Internet Engineering Task Force (IETF) Internet Protocol Security (IPSec) standard.21 Sep 2005

  • megahertz (MHz)

    The megahertz, abbreviated MHz, is a unit of alternating current (AC) or electromagnetic (EM) wave frequency equal to one million hertz (1,000,000 Hz).21 Sep 2005

  • shielded twisted pair

    This definition closely duplicates the definition for twisted pair.21 Sep 2005

  • MAC address (Media Access Control address)

    In a local area network (LAN) or other network, the MAC (Media Access Control) address is your computer's unique hardware number.21 Sep 2005

  • data link control (DLC)

    DLC also is an abbreviation for digital loop carrier.21 Sep 2005

  • HDSL (High bit-rate Digital Subscriber Line)

    Also see our Fast guide to DSL. HDSL (High bit-rate Digital Subscriber Line), one of the earliest forms of DSL, is used for wideband digital transmission within a corporate site and between the tel...21 Sep 2005

  • connection

    In telecommunication and computing in general, a connection is the successful completion of necessary arrangements so that two or more parties (for example, people or programs) can communicate at a...21 Sep 2005

  • Personal Access Communications System (PACS)

    Personal Access Communications System (PACS) is a type of wireless telephone network compatible with telephone sets, answering machines, fax machines, and computers.21 Sep 2005

  • crossover cable

    A crossover cable is a cable that is used to interconnect two computers by "crossing over" (reversing) their respective pin contacts.21 Sep 2005

  • optoisolator (optical coupler or optocoupler)

    An optoisolator, also known as an optical coupler or optocoupler , is a semiconductor device that allows signals to be transferred between circuits or systems21 Sep 2005

  • Evernet

    The term Evernet has been used to describe the convergence of wireless, broadband, and Internet telephony technologies that will result in the ability to be continuously connected to the Web anywhe...21 Sep 2005

  • satellite Internet connection

    A satellite Internet connection is an arrangement in which the upstream (outgoing) and the downstream (incoming) data are sent from, and arrive at, a computer through a satellite.21 Sep 2005

  • cable modem termination system (CMTS)

    A cable modem termination system (CMTS) is a component that exchanges digital signals with cable modems on a cable network.21 Sep 2005

  • fast retransmit and recovery (FRR)

    In TCP/IP, fast retransmit and recovery (FRR) is a congestion control algorithm that makes it possible to quickly recover lost data packets.21 Sep 2005

  • transactional e-mail

    Transactional e-mail is a type of Web-based marketing in which e-mail recipients can buy goods and services directly from an e-mail message, without being redirected to the retailer's Web site.21 Sep 2005

  • phantom dialing

    In mobile wireless communication, phantom dialing is a term used to describe what occurs when a user unintentionally presses a pre-programmed auto-dial number on their cellular telephone keypad and...21 Sep 2005

  • media access management

    In the Open Systems Interconnection (OSI) communication reference model, media access management is performed by the Media Access Control (MAC) sublayer of the Data-Link Layer.21 Sep 2005

  • terbo

    The suffix terbo appears in the V.32terbo modem protocol and indicates the third version of the V.32 protocol.21 Sep 2005

  • satellite return Internet connection

    A satellite return Internet connection is an arrangement in which incoming data arrives at your computer from a satellite downlink and outgoing data (such as your request for the next Web page) is ...21 Sep 2005

  • registered port numbers

    The registered port numbers are the port numbers that companies and other users register with the Internet Corporation for Assigned Names and Numbers (ICANN) for use by the applications that commun...21 Sep 2005