This is the specific CoS map table ID used by this pseudowire CoS profile when its frame CoS policy is set to rcos-mapped, defining exactly how incoming frame markings translate into internal priority values for any pseudowire assigned to this profile. As with the tunnel-level equivalent, this value is only meaningful when the sibling frame CoS policy is actually rcos-mapped -- otherwise it's not in effect. An admin auditing why differently-marked customer traffic on pseudowires sharing this profile all receive the same prioritization would check whether this profile's policy is actually fixed rather than rcos-mapped, which would explain uniform treatment regardless of incoming markings.