An array of up to 512 real H(f) logarithmic representation values in dB for the respective transmission direction. It is designed to support up to 512 (downstream) subcarrier groups and can be retrieved in a single segment. The number of utilized values in the downstream direction depends on NSds; in the upstream direction, it depends on NSus. This value is referred to here as NS. Each array entry represents the real Hlog(f = i*Df) value for a particular subcarrier group index i, (0 <= i <= NS). The real Hlog(f) value is represented as (6-m(i)/10), with m(i) in the range 0 to 1022. A special value m=1023 indicates that no measurement could be done for the subcarrier group because it is out of the passband or that the attenuation is out of range to be represented. This parameter is applicable in loop diagnostic procedure and initialization. Each value in this array is 16 bits wide and is stored in big endian format.