Patent ID: 7352759
Filing Date: 2008-04-01
Classification: H04J,H04Q

Abstract:
1. An E-PON (Ethernet Passive Optical Network) comprising: an OLT (Optical Line Terminal); and a plurality of ONUs (Optical Network Units) connected to the OLT, said OLT including means for assigning bandwidth to the plural ONUs utilizing one or more logical DBACNs (Dynamic Bandwidth Allocation Control Nodes), wherein the DBACNs and ONUs are arranged in hierarchical stages of a tree, with the ONUs being positioned in a lowermost stage thereof, and DBACNs or ONUs positioned in an intermediate stage are connected to a DBACN positioned in a stage higher than that intermediate stage, each of the DBACN allocates a smaller of a total available allocation-bandwidth and a total requested bandwidth to a lower stage DBACNs or ONUs connected thereto in a priority order of said tree.