It is possible to use monitoring measurements collected from a subset of all the network lightpaths (LP1, LP2, LP3, LP4) to estimate accurately the corresponding end-to-end metric (e.g., OSNR) of a lightpath that is not monitored (LP5) using the "network kriging" estimation framework. Placing monitoring devices at the termination points of LP1, LP2, LP3, and LP4 would allow the operator to also estimate the QoT of LP5 using only partial network information. See Angelou et al., pp. 15-24
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