This counts PW packets that arrived so far out of sequence that the receive buffer could not reorder them and had to discard them. Unlike Reorder, Missorder on this pseudowire represents packets effectively lost from the TDM playback's point of view, so a rising Missorder count means the jitter buffer depth configured for this service is too shallow for the reordering/delay variation the network is actually producing -- and this specific object covers a closed 15-minute history bin -- a fixed, final count for one completed interval rather than something still changing. For example, over that completed 15-minute bin, 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.