APPARATUS AND METHOD FOR ENABLING A PASSIVE OPTICAL NETWORK ON SUPPORTING TIME SYNCHRONIZATION

摘要

An apparatus for enabling a passive optical network (PON) having an OLT and at least one ONU on supporting time synchronization is disclosed. The apparatus comprises a timestamp correction module configured to make at least one network delay between the OLT and the at least one ONU of the PON equivalent to an equivalent path delay, wherein the timestamp correction module, through the PON, makes the at least one ONU responsible for modifying the timestamp in at least one PTP packet from the OLT, so that a slave clock at the backend of the at least one ONU is equivalent to synchronizing with a virtual master clock. The disclosure computes and corrects PTP commands so that the PTP clock at an ONU's backend may synchronize precisely with the master clock at an OLT's front end.

主权项

1. An apparatus for enabling a passive optical network (PON) on supporting time synchronization, wherein said PON has an optical line terminal (OLT) and at least one optical network unit (ONU), said apparatus comprising:
a boundary clock device deployment unit configured to make the PON equivalent to a boundary clock device; wherein the OLT maintains a first precision time protocol (PTP) boundary clock, and the at least one ONU maintains a second PTP boundary clock, and in between the OLT and a master clock at a front end of the OLT, and in between a slave clock at a backend of the at least one ONU and the at least one ONU, a respective PTP is use to maintain synchronization.