IEEE-1588-PTP

2/7/2010FB1PMWhitePaperOctober2008EthernetTimeSynchronizationProvidingNativeTimingWithintheNetwork2/7/2010FB1PM®EthernetTimeSynchronizationPhone:949-926-5000Fax:[phone]E-mail:[e-mail]:©2008byBROADCOMCORPORATION.Allrightsreserved.StrataXGSIV-WP100-ROctober2008Broadcom®,thepulselogo,Connectingeverything®,andtheConnectingeverythinglogoareamongthetrademarksofBroadcomCorporationand/oritsaffiliatesintheUnitedStates,certainothercountriesand/ortheEU.Anyothertrademarksortradenamesmentionedarethepropertyoftheirrespectiveowners.2/7/2010FB1PMWhitePaperEthernetTimeSynchronizationOctober2008BroadcomCorporationDocumentStrataXGSIV-WP100-RPageiiiTABLEOFCONTENTSAbstract.........................................................................................................................................................1BackgroundandApplications....................................................................................................................1MobileBackhaul......................................................................................................................................1IndustrialAutomation..............................................................................................................................2Audio/Video.............................................................................................................................................3EthernetTimeSynchronizationPrinciples................................................................................................4PacketTimeSynchronization.................................................................................................................4PTPLinkDelayMeasurementMethod............................................................................................5PTPTimeSynchronizationMethod.................................................................................................6PTPSlaveTimeCorrection.............................................................................................................8PhysicalLayerTimeSynchronization.....................................................................................................9TheBroadcom®ETSSolution...................................................................................................................11PacketTimeSynchronizationSolution.................................................................................................11PTPChipProcessingFlows..........................................................................................................11BroadSync™GlobalTimeModule................................................................................................13BroadSyncInterface......................................................................................................................16UsingtheBroadSyncInterface......................................................................................................18PhysicalLayerTimeSynchronizationSolution.....................................................................................20BroadcomPTPinModularSystems.....................................................................................................23BroadcomPTPScalabilityandPerformance........................................................................................27Conclusion..................................................................................................................................................292/7/2010FB1PMEthernetTimeSynchronizationWhitePaperOctober2008BroadcomCorporationPageivDocumentStrataXGSIV-WP100-R2/7/2010FB1PMWhitePaperEthernetTimeSynchronizationOctober2008BroadcomCorporationDocumentStrataXGSIV-WP100-RPagevLISTOFFIGURESFigure1:MobileBackhaulRequiresTimeSynchronization.............................................................................1Figure2:MobileBackhaulEvolution.................................................................................................................2Figure3:TimeSynchronizationinIndustrialAutomation..................................................................................2Figure4:EthernetAVintheHomeNetwork.....................................................................................................3Figure5:TimeSynchronizationHierarchy........................................................................................................4Figure6:PTPLinkDelayMeasurement...........................................................................................................5Figure7:PTPTimeSynchronization-DirectMaster/Slave..............................................................................6Figure8:TimeSynchronizationwithTransparentClocks.................................................................................6Figure9:PTPTimeSynchronization-IndirectMaster/Slave....................