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    X.25 Tutorials

  • X.25
    Covers the protocol layers, virtual circuits, HDLC family, SDLC, HDLC, LAPB, field control format, HDLC frames, examples of HDLC operation, call setup, call disconnection, and packet format.
    Educational Site since: 2002-10-20 Hits: 3532 Votes: 8 Rating: 2.75 Rate

  • X.25
    Discusses the history and development of the X.25 protocol, describes the basic functions and components of X.25, and describes the frame formats of X.25.
    Commercial Site since: 2002-10-20 Hits: 3016 Votes: 0 Rate

  • X.25 Packet Switching
    Describes the X.25 layers, Switched virtual circuits (SVCs), Permanent virtual circuits (PVCs), connection establishment, packet sizes, and more.
    Commercial Site since: 2002-10-20 Hits: 2422 Votes: 0 Rate

  • HDLC Protocol Tutorial
    A brief tutorial explaining frame format, frame categories and the job of the HDLC layer.
    Commercial Site since: 2004-07-01 Hits: 2260 Votes: 2 Rating: 1.5 Rate

  • X.21 Overview
    Discusses the X.21 state driven protocol, describes the signals, describes the protocol operation, the procedure for a DTE placing a call, and a DTE in the ready state to receive an incoming call.
    Commercial Site since: 2002-10-20 Hits: 1700 Votes: 1 Rating: 1 Rate

  • SDLC Protocol Tutorial
    Explains SDLC and provides some history.
    Commercial Site since: 2004-07-01 Hits: 1494 Votes: 1 Rating: 1 Rate




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