US 11,677,465 B2
Hysteresis-based link flapping prevention in an optical network
Yawei Yin, Redmond, WA (US); Jamie Gaudette, Redmond, WA (US); and Binbin Guan, Redmond, WA (US)
Assigned to MICROSOFT TECHNOLOGY LICENSING, LLC, Redmond, WA (US)
Filed by MICROSOFT TECHNOLOGY LICENSING, LLC, Redmond, WA (US)
Filed on Sep. 30, 2021, as Appl. No. 17/491,277.
Claims priority of provisional application 63/220,976, filed on Jul. 12, 2021.
Prior Publication US 2023/0012193 A1, Jan. 12, 2023
Int. Cl. H04B 10/079 (2013.01); H04B 10/03 (2013.01)
CPC H04B 10/0795 (2013.01) [H04B 10/03 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical communications network comprising:
a plurality of optical data links comprising a plurality of data channels; and
a system communicatively coupled to the plurality of optical data links, the system comprising a processor and memory storing executable instructions that configure the system to perform operations comprising:
determining a pre-forward error correction (preFEC) bit error rate (BER) of a selected optical link;
obtaining a FEC Detected Degrade (FDD) threshold, FEC Excessive Degrade (FED) threshold, and FEC limit threshold for the selected optical link, wherein the FDD threshold is less than the FED threshold and the FED threshold is less than the FEC limit threshold;
asserting a link down condition when the preFEC BER rises above the FEC limit threshold; and
de-asserting the link down condition when the preFEC BER falls below the FED threshold.