This value specifies the MAC address used as the target for a One-Way-Delay Test (OWDT); setting it triggers the test, and it reverts to its default once the test completes. An admin sets this to the remote MEP's MAC address to measure one-way latency to that specific peer, useful for services with asymmetric-path latency requirements where round-trip delay measurement alone isn't precise enough. One-way delay tests require clock synchronization between the two ends to be meaningful, unlike a two-way delay test.