Method and system for fault isolation within a network element in an optical network
First Claim
1. A method for fault isolation within a network element (NE) in an optical network, the method comprising the steps of:
- identifying root cause alarms within the optical network by using a directed acyclic graph (DAG);
masking of all remaining correlated alarms within the NE; and
displaying said root cause alarms;
wherein the DAG represents the NE each vertex in which represents a physical port direction in the NE and edges are directed between the vertices based on the NE topology.
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Abstract
A method and system for fault isolation within a network element in an optical network is described. A single fault in the system can give rise to multiple alarms detected at multiple points. Finding the root cause alarm corresponding to the fault that has triggered these alarms is important for fault isolation and is the focus of attention for this invention. The network element is modeled by a directed acyclic graph that captures the interactions among various components in the network element. Using a graph-based technique the invention analyzes the various topological faults raised and their locations for identifying root cause alarms and masking all correlated alarms.
33 Citations
26 Claims
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1. A method for fault isolation within a network element (NE) in an optical network, the method comprising the steps of:
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identifying root cause alarms within the optical network by using a directed acyclic graph (DAG);
masking of all remaining correlated alarms within the NE; and
displaying said root cause alarms;
whereinthe DAG represents the NE each vertex in which represents a physical port direction in the NE and edges are directed between the vertices based on the NE topology. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for fault isolation within a network element (NE) in an optical network, wherein the NE has a view of a network topology and Wavelength Tracker data obtained by using Wavelength Tracker technology, the optical network contains optical channel paths, each having a unique signature in a form of a low frequency dither tone modulation called Wavekey, generated by Wavelength Tracker, the method comprising the steps of:
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identifying root cause alarms in the NE; and
displaying said root cause alarms. - View Dependent Claims (13)
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14. A system for fault isolation within a network element (NE) in an optical network, the system comprising:
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means for identifying root cause alarms within the optical network by using a directed acyclic graph (DAG);
means for masking of all remaining correlated alarms within the NE; and
a display unit for displaying said root cause alarms;
whereinthe DAG represents the NE each vertex in which represents a physical port direction in the NE and edges are directed between the vertices based on the NE topology. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A system for fault isolation within a network element (NE) in an optical network, wherein the NE has a view of a network topology and Wavelength Tracker data obtained by using Wavelength Tracker technology, the optical network contains optical channel paths, each having a unique signature in a form of a low frequency dither tone modulation called Wavekey, generated by Wavelength Tracker, the system comprising:
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means for identifying root cause alarms in the NE; and
a display unit for displaying said root cause alarms. - View Dependent Claims (26)
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Specification