5 Time sync Network Limits Aspects to be addressed when defining the Network LimitsReference network (HRM) for the simulationsMetricsNetwork Limits Components (Constant and Dynamic Time Error)Failure conditionsNetwork RearrangementsTime Sync HoldoverGeneva, Switzerland, 2 13 July 2013
8 Sync Standards Coordination MAX |TE| based LimitsThe Constant Time Error measurement was initially proposed as could be easily correlate to the error sources (e.g. Asymmetries), howeverComplex estimator (see G.8260)Different values at different times (e.g. due to temperature variation)Max |TE| has then been selected :The measurement might need to be done on pre-filtered signal (e.g. emulating the End Application filter, i.e. 0.1 Hz). This is still under study.End ApplicationT-TSCTEDDTE(t)PTP1 PPSCMax|TE|max|TE’|Test Equipment1500 nsMax |TEC (t)| = max|TE’| + TEREA + TEEA < TEDGeneva, Switzerland, 13 July 20131100 ns400 ns
10 Stability Requirements Additional requirement on stability of the timing signal is needed and is under studyApplicable to the dynamic component (d(t))In terms of MTIE and TDEVPossible Jitter requirementsImportant for End Application ToleranceGeneva, Switzerland,13 July 2013
11 Challenges for an operator Distribution of accurate time synchronization creates new challenges for an operatorOperation of the networkHandling of asymmetries (at set up and during operation)Planning of proper Redundancy (e.g. Time sync Holdover is only available for limited periods (minutes instead of days). Exceeding the limits can cause service degradationNew testing proceduresNetwork performance and Node performance requires new methods and test equipmentSome aspect still under definition (e.g. G.8273.x)Geneva, Switzerland, 2 13 July 2013
13 Next Steps Work is not completed Dynamic components in terms of MTIE and TDEV; Jitter?Testing methods (G.8273 provides initial information)Partial Timing supportGeneva, Switzerland, 13 July 2013
14 Partial Timing Support HRM for GNeed to define new metrics (e.g. 2-ways FPP)Geneva, Switzerland,13 July 2013
15 Summary G.8271.1 consented this week: Max |TE| Time sync limits are availableThe delivery of accurate time sync presents some challenges for an operatorAsymmetry calibrationHandling of failures in the networkStill some important topics need to be completedStability requirementsPartial timing support (G )Geneva, Switzerland, 13 July 2013
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