This counts occurrences of the CESoP-specific M-bit being set in the control word of packets on this pseudowire, used to signal additional defect/mode conditions beyond the basic L/R bits. Because the M-bit carries CESoP profile-specific signaling for this pseudowire, a rising count here alongside otherwise normal traffic usually means an interoperability or mode-mismatch condition with the remote endpoint worth checking against the peer's configuration -- and this specific object covers a closed 24-hour history bin -- a final, day-over-day comparable count rather than a live figure. For example, over that completed 24-hour bin, this pseudowire might show this counter at 20 -- a concrete count the admin can trend against neighboring bins to judge whether the condition it reflects is worsening.