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This overview provides a summary of the Q13 recommendations, including definitions, terminology, metrics, and network requirements for synchronization. It also discusses improvements in accuracy, security, and configuration. The backward compatibility with existing protocols and the convergence with IEEE 802.1AS are highlighted. The implementation of one-step clock, network limits, and new synchronization methods are discussed as well. Additionally, it covers the developments in stream reservation protocols and scheduled traffic management. The profiles in G.8275.x for supporting mobile technologies are also mentioned.
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Overview of Q13 recommendations G.8260 (Definition) Definitions /terminology Agreed Ongoing G.8260 AppI (metrics) Frequency: G.826x Time/Phase:G.827x G.8261 G.8271 Basics SyncE Jitter-Wander: (Included in G.8261) G.8271.1(Network limits_time/phase Network requirements G.8261.1(NetwkPDV_frequency) G.8271.2(profile2) 73.1 GM G.8262 (SyncE) G.8272PRTC 73.2 BC Clock G.8273 G.8263 (slave clock) 73.3 TC 73. x,y,z G.8264(SyncE-architecture-SSM) Methods G.8275(architecture-time) G.8265(architecture-Frequency) G.8265.1(PTPprofileFrequency) G.8275.1(PTPprofile1Time/phase) Profiles G.8275.2(PTPprofile2Time/phase ) G.8265.m(PTP Profile frequency m) 1 G.supp
Summary of the Synchronization sessions -1 • IEEE 1588 Revision • Fix existing problems, remove inconsistancies • Improve accuracy, security, configuration and MIBs • Layered architecture, but backwards compatible • Backward compatibility is very important for operators • IEEE 802.1AS Revision • Additional link types, link aggregation • Redundancy and faster reconfiguration • Architectural convergence with 1588
Summary of the Synchronization sessions -2 3 • IEEE Issue One stepclock • One-step clockimplies the implementation of hardware thatgreatlyreduces the processor requirements for synch and delayprocessing • Backwards compatibility a requirement • IEEE 1588 simulations for G.827x & 802.1AS • The proposed G.827x and 802.1AS profiles willmeettheir goals • Partial support still to beperformed in ITU
Summary of the Synchronization sessions -3 • Network limits-Asymmetry Asymmetry remains one of the main issues in the transport of time. Partial support might add new sources of asymmetry • Synchronization network architecture • Key aspects of NGN synchronization • Packet network infrastructure • New synchronization requirements • New methods • New clock structures • Architecture helps see how all pieces fit together
Summary of the Synchronization sessions - 4 • 802.1Q Stream reservation protocol • deterministic operation requires that resources are available • based on 802.1Q Multiple Registration Protocol • talkers advertise the streams that they can source • Important side-effect sets up a reservation « domain » • listeners register for streams • New work under way • static reservations, faster startup, big reduction in packet traffic, support for new shapers, more management
Summary of the Synchronization sessions - 5 • 802.1Qbv scheduled traffic • Scheduling stream transmission can greatly reduce delays through switches • Cut-through makes sense • Management of schedule is not a plug-and-play operation, it will require intelligence
Summary of the Synchronization sessions -6 • G.8275.x profiles • G.8275.x time PTP telecom profiles are designed to support the needs of current and future mobile technologies • G.8275.1 (full timing suport) will be finalized soon, G.8275.2 (partial timing support) is just starting
