Patent ID: 9479248
Filing Date: 2016-10-25
CPC Classification: H04B,H04J,H04Q

Claim Text:
1. An Optical Transport Network (OTN) fault localization method, comprising: localizing a fault in a multi-domain OTN network to either an inter-domain link (IrDL) or an administrative domain in the multi-domain OTN network based on monitoring endpoint tandem connection monitors; responsive to the fault being in the administrative domain, localizing the fault within the administrative domain through a first iterative process with a first fault localization tandem connection monitor within the administrative domain; and responsive to the fault being in the inter-domain link (IrDL), localizing the fault to a network element or a link within the inter-domain link (IrDL) utilizing a second iterative process with a second fault localization tandem connection monitor within the inter-domain link, wherein tandem connection monitors are moved in the first iterative process and the second iterative process to isolate the fault to a specific location comprising one of a switching fabric, a transport function, and a link, and wherein the tandem connection monitors are moved between specific locations subsequent to passing a test which shows that the fault is not present at a given specific location.