This read-only counter tallies OAM CLP1 cells transmitted on this circuit, the discard-eligible-marked variant of management cell traffic, with the same BIO1/Garnet-card caveat that this count instead appears under cktEntry 100 on that hardware. Since CLP1-marked OAM cells could theoretically be dropped under congestion like any other CLP1 traffic, tracking them separately from CLP0 OAM cells lets an admin verify management traffic isn't being treated as discard-eligible when it shouldn't be. An engineer confirming that fault-management OAM cells are being sent with proper priority (CLP0, tracked by the sibling object) rather than as CLP1 would compare cktAtmOutOAMClp1Cells against cktAtmOutOAMClp0Cells.