Patent ID: 7406260
Filing Date: 2008-07-29
Classification: H04L

Abstract:
1. A method for network wide fault isolation in an optical network having Optical Channel (OCh) paths, OCh path comprising a sequence of ports, the method me the steps of: identifying root cause alarms in the optical network; and displaying said root cause alarms; wherein the step of identifying the root cause alarms in the optical network comprises the steps of: constructing a list of all affected OCh paths in the optical network; and analyzing the OCh paths in said list; wherein the step of analyzing the OCh paths in said list, comprises the steps of: masking alarms in the OCh paths in transmit direction; and masking alarms in the OCh paths in receive direction; wherein the step of analyzing alarms comprises the steps of: preparing a list of the alarms present at each port on the OCh path in the transmit direction; determining if each alarm in the list is an OCh alarm or a port level alarm or a card level alarm; and masking alarms in the downstream OCh path in the transmit direction that are correlated with each alarm in the list.