This counts pseudowire (PWE) packets that were expected at the receiving end but never arrived at all. A rising Miss count on this pseudowire means packets are being lost somewhere in the underlying packet network (congestion, a flapping link, a reconvergence event), and because CESoP has no retransmission, each missing packet becomes an actual gap in the reconstructed TDM bitstream rather than just a delay -- and this specific object covers the current, still-open 15-minute interval -- a value that keeps climbing until the interval closes and rolls into history. For example, so far in the current, still-running 15-minute interval, this pseudowire might show this counter at 2 -- a concrete count the admin can trend against neighboring bins to judge whether the condition it reflects is worsening.