(XTP) A transport layer protocol for high-speed networks promoted by the XTP Forum. XTP provides protocol options for error control, flow control, and rate control. Instead of separate protocols for each type of communication, XTP controls packet exchange patterns to produce different models, e.g. reliable datagrams, transactions, unreliable streams, and reliable multicast connections.

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Contrast with Transmission Control Protocol. XTP does not employ congestion avoidance algorithms.