The purpose of this item is to provide an estimate of the MER margin available on the downstream data channel with respect to a candidate modulation profile. This is similar to the MER Margin reported in the OPT-RSP Message [MULPIv3.1]. The CM calculates the Required Average MER based on the bit loading for the profile and the Required MER per Modulation Order provided in the RequiredDsOfdmQamMer Table. The CM then measures the RxMER per subcarrier and calculates the Average MER for the Active Subcarriers used in the Profile and stores the value as MeasuredAvgMer. The CM also counts the number of MER per Subcarrier values that are below the threshold determined by the Required MER for the Modulation Order and the ThrshldOffset. The CM reports that value as NumSubcarriersBelowThrshld. This table will have a row for each ifIndex for the modem.