Lower layer protocols
XTP over ATM

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Abstract

This paper discusses some of the issues involved in mapping the Express Transfer Protocol (XTP) over the ATM (Asynchronous Transfer Mode) network technology. Both ATM and XTP are designed to facilitate high bandwidth transfers. ATM offers virtual channels that can be utilized to carry XTP frames without any encapsulation. The added benefit is the ability to offer different Quality of Service with the XTP channels. The largest problem area is the mapping of XTP signalling onto the signalling used in ATM. There is a mismatch in mechanisms that will result in inefficiency in the implementations. Some of the mechanisms in XTP seem to be optimized for shared medium technologies like Ethernet and FDDI. In our opinion, this needs to be changed in future releases of the protocol.

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