For ITU-T Recommendation G.992.5, this configuration parameter defines the subset of downstream PSD mask breakpoints, as specified in xdsl2LConfProfPsdMaskDs (PSDMASKds), that shall be used to notch an RFI band. This subset consists of pairs of consecutive subcarrier indices belonging to breakpoints: [ti; ti + 1], corresponding to the low level of the notch. The specific interpolation around these points is defined in the relevant Recommendations (e.g., ITU-T Recommendation G.992.5). The CO-MIB shall define the RFI notches using breakpoints in xdsl2LConfProfPsdMaskDs (PSDMASKds) as specified in the relevant Recommendations (e.g., ITU-T Recommendation G.992.5).

For ITU-T Recommendation G.993.2, this configuration parameter defines the bands where the PSD shall be reduced as specified in #7.2.1.2/G.993.2. Each band shall be represented by a start and stop subcarrier indices with a subcarrier spacing of 4.3125 kHz. Up to 16 bands may be specified. This parameter defines the RFI bands for both the upstream and downstream directions.