AsymmetricNetworks(xPONetc.)–创新.PDFVIP

Asymmetric Networks (xPON etc.) – Timing Solutions Topics Timing Overview Phase and ToD Requirements Asymmetric Networks and the Problem of Phase IEEE 1588v2 and ToD Transfer Asymmetry of Multipoint to Point Networks Solution A - Transparent Clock Solution B - The Boundary Clock Solution C - The PTP Delay Equalizer And the winner is…… 2 Who is Calix Networks? Not to be confused with Calnex  Equipment supplier of access network solutions GPON Point to point Ethernet DSL For residential, business and mobile backhaul 3 Timing Overview Elements of Timing and Synchronization The concept of network timing contains multiple elements Frequency across an infrastructure may need to be synchronized, this is called “Syntonization” Phase may need to be synchronized – e.g. 1 pulse per second signals may need to be aligned in phase across a network. If phase is synchronized, then frequency is necessarily also synchronized Time of Day traceable to Coordinated Universal Time (UTC) may be required at certain points in a network. Frequency and phase sync may be obtained from ToD We will focus on Phase and ToD synchronization in this presentation 4 Topics Timing Overview Phase and ToD Requirements Asymmetric Networks and the Problem of Phase IEEE 1588v2 and ToD Transfer Asymmetry of Multipoint to Point Networks Solution A - Transparent Clock Solution B - The Boundary Clock Solution C - The PTP Delay Equalizer And the winner is…… 5 Why is Phase Synchronization