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P802.1ASbt - IEEE Standard for Local and Metropolitan Area Networks - Timing and Synchronization for Time-Sensitive Applications in Bridged Local Area Networks Amendment: Enhancements and performance improvements

This amendment allows IEEE 802.1AS to be used: - With a greater number of network media types and a greater variety of network configurations, and - More effectively with existing and new media types and network configurationsThis amendment specifies enhancements to IEEE Std 802.1AS that are backward compatibile with the features defined in the 2011 version of the standard, including, if necessary, a means of version discovery. The enhancements that are to be considered by this project include: - Support for link aggregation (IEEE 802.1AX, IEEE 802.1AXbk, and 802.1AXbq). - Support for new media types, with corresponding media-dependent layers, e.g., IEEE Std 1901 and WiFi Direct. - Interoperability with one-step clocks on receive (but with no requirement to generate one-step Sync messages). - Support for redundant paths. - Enhancements to the determination of asCapable (e.g., longer cable lengths, new media types). - Incorporation of the interfaces specified in IEEE Std 802.3bf into the IEEE 802.3 full-duplex media-dependent layer model. - Improved performance (e.g., improved grandmaster changeover time, longer chains of time-aware systems). - Carrying information on alternate time scales (e.g., local time for a respective time zone). - Management support for automatic measurement of link delay asymmetry. - Additional parameter sets for non-Audio/Video applications, e.g., industrial control.
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