Method and system for network wide fault isolation in an optical network
AssigneeAlcatel-Lucent Canada Inc.
InventorRoderick William MacDonald
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Abstract
A method and system for network wide fault isolation in an optical network are described. A single fault in a network can produce a large number of alarms at different points in an optical network. The described method and system identify the root cause alarm while masking all correlated alarms. In the embodiment of the invention, the method and system are based on a wavelength tracker technology allowing identification and tracking of individual channels in the optical network.
Claims12
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.
A system for network wide fault isolation in an optical network, wherein
- the optical network contains OCh paths, each OCh path comprising a sequence of ports, the system comprising:
- means for identifying root cause alarms in the optical network;
- and
- a display unit for displaying said root cause alarms;
- wherein the means for identifying the root cause alarms in the optical network comprises:
- means for constructing a list of all affected OCh paths in the optical network;
- and
- means for analyzing the OCh paths in said list;
- wherein the means for analyzing, the OCh paths in said list comprises:
- means for masking alarms in the OCh path in transmit direction;
- and
- means for masking alarms the in OCh path in receive direction;
- herein the means for masking alarms in the OCh path in the transmit direction comprises means for analyzing alarms at the ports on the OCh path in the transmit direction;
- and
- wherein the means for analyzing alarms in the transmit direction comprises:
- means for preparing a list of the alarms present at each port on the OCh path in the transmit direction;
- means for determining if each alarm in the list is an OCh alarm or a port level alarm or a card level alarm;
- and
- means for masking alarms in the downstream OCh path in the transmit direction that are correlated with each alarm in the list.
Dependencies are inferred from the claim text.