Patent ID: 9225607
Filing Date: 2015-12-29
Classification: G06F,H04B,H04L

Abstract:
1. A network system with a predetermined network including an OLT and a plurality of ONUs, said OLT having a distance information acquisition function for obtaining distance-related information concerning a transmission distance between said OLT and each of said plurality of ONUs, a power information acquisition function provided in between said OLT and said plurality of ONUs for obtaining at least one of first power information and second power information as a transmission-channel-loss parameter group, said first power information including a downstream transmission power value of said OLT and downstream reception power values of said plurality of ONUs at a time of downstream transmission from said OLT to said plurality of ONUs, said second power information including upstream transmission power values of said plurality of ONUs and an upstream reception power value of said OLT at a time of upstream transmission from said plurality of ONUs to said OLT, said network system further including a topology map generation part for generating a topology map by performing a topology map generation process based on a plurality of distance-related information and a plurality of transmission-channel-loss parameter groups that are a plurality of said distance-related information and a plurality of said transmission-channel-loss parameter groups between said OLT and said plurality of ONUs, said topology map generation process comprising the steps of: (a) calculating a plurality of numbers of 2-branches that are the numbers of 2-branches of splitters on a transmission path between said OLT and said plurality of ONUs, based on a plurality of transmission distances and said plurality of transmission-channel-loss parameter groups, said plurality of transmission distances being transmission distances between said OLT and said plurality of ONUs and obtained by said plurality of distance-related information; and (b) generating said topology map based on said plurality of numbers of 2-branches and said plurality of transmission distances.