Patent ID: 8130782
Filing Date: 2012-03-06
Classification: H04J,H04Q

Abstract:
1. A passive optical network comprising: a parent station OLT (optical line terminal); and a plurality of child stations ONU (optical network terminating unit), wherein the parent station and the plurality of child stations transmit an upstream frame and a downstream frame to each other, the parent station includes means for generating a maintenance signal indicating failure at a mini slot, corresponding to each of the plurality of child stations, on a basis of a receiving state of a signal at the mini slot sent from each of the plurality of child stations, the means for generating the maintenance signal detects at least one of the following failures at the mini slot: the parent station includes means for instructing, based on a state transition table, a child station to transit to a state other than an operation state when the parent station detects the failure at the mini slot.