| 摘要 |
PROBLEM TO BE SOLVED: To solve the following problems: it is necessary to completely remove overlapping of signals between a plurality of PONs in order to make the PONs coexist, consequently it is required to share or intensively manage bandwidth use conditions over an optical fiber that serves as a common band between a plurality of systems, and the transmission clocks therefore should be synchronized with high accuracy between the plurality of systems. SOLUTION: A reference clock is provided from an external device or a representative OLT to the entire systems to perform clock synchronization between plural systems, so that the overall systems are synchronized by synchronizing each OLT with the reference clock. A hierarchical management method is selected that manages ONUs under the control of each OLT by managing band use information arranged for each OLT with respect to an external device or a representative OLT for sharing of bandwidth use conditions between plural systems. COPYRIGHT: (C)2009,JPO&INPIT
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