When LCK (Lock) is inserted in the local ODUk PM overhead, the downstream site processes it by (A) inserting the ODUk PM BDI (Backward Defect Indication) alarm back to the upstream site and (D) reporting the ODUk_PM_LCK alarm locally. This mechanism allows upstream devices to be aware of downstream lock conditions, enabling coordinated protection actions. HCIP-Transmission highlights these procedures as part of OTN fault propagation and monitoring to maintain network stability and rapid fault response.
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