This counts occurrences of the CESoP control-word R-bit being set on packets received over this pseudowire, which signals that the remote end is experiencing packet loss on its receive side. The R-bit on this PW is effectively the far end reporting 'I'm losing your packets,' so it flags a problem in the this-device-to-remote direction of the network path even though it's observed locally -- 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.