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Design and implementation of flexible User Protocol Interface

This paper is focused on an efficient protocol implementation based on flexible User Protocol Interface (UPI) configurable for different service options and protocol processing architectures. The XTPL implementation discussed in this paper is developed based on the BERKOM eXpress Transfer Protocol (XTP) Lite version for HP 900017x Series using HP-UX 9.0 operating system. This implementation supports the dynamical configuration of user protocol interfaces intended to provide different objectives: - optimization of the user data copy operations (use of the "single copy architecture"); - selectable QoS options for application layer framing, reliability and checksumming. Performance analyses are included to show the flexible use of user protocol interfaces, in particular the reliable single and dual copy interface, dependent on the application traffic of the connections.