NetX SolutionsData distribution to multiple destinations: Multicast allows a single transmitter to send data to any number of receivers. XTP supports any number of multicast groups (one transmitter per group), so we also support NxN multicasting (N transmitters, N receivers, N groups). Reliable data transfer: Unicast and multicast both support 100% reliable transmission with transparent error correction. Transactions: XTP supports fast, efficient, reliable transaction processing using only three packets for a reliable exchange. Datagrams: XTP provides either the traditional unacknowledged datagram, or a new, fast, efficient service called the "reliable datagram" – a one time message, but guaranteed to arrive at its destination. Knowledge of receivers: Multicast group management allows the transmitter to know everything or nothing about the membership of the multicast group. When errors occur (such as a receiver failure), application-defined semantics determine whether the group halts, or continues with one fewer member. Traffic shaping and congestion control: Rate control optionally limits the transmitter to producing no more than "rate" bytes/second. Burst control optionally limits the transmitter to producing no more than "burst" bytes per transmission. These limits are dynamically adjustable to achieve traffic shaping and/or congestion avoidance. Long-latency links: XTP’s sequence space of 2^64 bytes assures that the protocol will not collapse into a stop-and-wait protocol just because there are many unacknowledged messages outstanding. High-error-rate environments: Selective retransmission can resend only the data reported missing by the receiver; it need not restart the data stream from the last acknowledged byte (as with go-back-n retransmission). This make the protocol much more efficient than TCP when repairing errors. Fragmentation avoidance: XTP’s method of Maximum Transmission Unit (MTU) discovery allows the transmitter to determine the maximum size packet that will not trigger fragmentation by IP; future packet transmissions can then be guaranteed to be no longer than the MTU limit. Multi-level security: Unlike TCP which requires bi-directional transmission between correspondents, XTP can be configured to require absolutely no information from the receiver. This allows a lower security level application (e.g., "secret") to talk to a higher security level application (e.g., "top secret") without any chance of data leakage in the reverse direction. The reverse channel can be physically removed.
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Network Xpress |
Telephone: (804) 293-8066 |
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FAX: (804) 293-8414 |