A count of the number of times a REGISTER MPCP frame reception occurs. Increment the counter by one for each REGISTER MPCP frame received as defined in [802.3ah], clause 64. This object is applicable for an OLT and an ONU. At the OLT, it has a distinct value for each virtual interface. At the OLT, the value should be zero. Discontinuities of this counter can occur at re-initialization of the management system and at other times, as indicated by the value of the ifCounterDiscontinuityTime object of the Interface MIB module.