Patent ID: 8666242
Filing Date: 2014-03-04
Classification: H04J

Abstract:
1. A method comprising: sending a plurality of optical transport network (OTN) frames from an OTN interface of a first network element to a remote network element over a first unidirectional channel of a bi-directional communication channel; receiving over a second unidirectional channel of said bidirectional communication channel an Optical Transport Unit (OTU) backwards defect indicator (BDI) signal at said OTN interface from said remote network element that is configured to indicate a transmission failure of said first unidirectional channel; and in response to receiving said OTU BDI signal, generating an alarm signal comprising a polynomial sequence that is configured to trigger switching operations at a Multi-Protocol Label Switching (MPLS) layer so that said first network element switches routing to said remote network element.