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G.8265.1 (PTPprofileFrequency)

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.

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G.8265.1 (PTPprofileFrequency)

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  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

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