Patent ID: 8285139
Filing Date: 2012-10-09
Classification: H04B,H04J,H04L,H04Q

Abstract:
1. A method for managing alarms in a Long Reach Passive Optical Network (LR-PON) system, comprising: obtaining a Passive Optical Network (PON) signal from an Optical Line Terminal (OLT) or an Optical Network Unit (ONU) on one side; checking whether the obtained PON signal fails and notifying the ONU or the OLT on the other side if the PON signal fails; by the ONU or the OLT on the other side, judging and locating the failure according to the received notification and taking a corresponding action; obtaining an electrical signal through optical-to-electrical conversion of the PON downstream optical signal from the OLT; performing frame alignment for a data frame in the obtained electrical signal to judge whether the LOF occurs; and, if a result of the judgment is positive, switching off the transmitting laser in the downstream direction; and determining, by the ONU, that the failure leading to the LOS occurs on the downstream path from the E-R regenerator to the ONU, and taking the corresponding action; or if the result of the judgment is positive, sending the set first-type downstream AIS to the ONU; and determining, by the ONU, that the failure leading to the LOS or LOF occurs on the downstream path from the OLT to the E-R regenerator.