Assuming we have an optical WAN backbone, how can it be detected if a link has failed? Is it high error rate? Smaller q-Factor? Please elaborate.
Dear Mohammad,
Link failure is generally detected by optical receivers, not only for fiber cut but also for signal degradation (i.e., excessive BER). You may get more info in references like https://www.juniper.net/documentation/en_US/junos/topics/concept/otn-signal-degrade-monitoring-understanding.html or https://www.google.com/patents/US7826745.
Additionally, upon severe degradation or fiber cut a loss-of-light (LOL) alarm could be issued to NMS/OSS systems.
Best regards,
José Luis
Dear Mohammad,
In our telecom company, we mostly use SMonitor software to prudently monitor the associated nodes of network.
http://www.fiber-optics.info/articles/overview_of_fiber_optic_communications_networks
https://dl.acm.org/citation.cfm?id=2042995
Hello.
The question would deserve to be more specific, the terms "optical" and "link" being quite loose these days.
Assuming "optical" refers to WDM and "link" to "a fiber between 2 neighbor optical nodes" (i.e. an OMS between 2 ROADMs), looking at the signal from the optical receiver's perspective isn't enough to get an accurate information because wavelengths typically span multiple links. Usual systems just rely on a supervision channel, i.e. a low rate wavelength multiplexed with others and terminated at each node, thus enabling to monitor the health of multiplexed sections.
J.
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