| Description | The SNR Margin per subcarrier group, expressing the ratio
between the received signal power and received noise power per
subscriber group. It is an array of 512 octets, designed for
supporting up to 512 (downstream) subcarrier groups and can be
retrieved in a single segment.
The number of utilized octets in the downstream direction depends
on NSds; in the upstream direction, it depends on NSus. This
value is referred to here as NS.
Octet i (0 <= i <= NS) is set to a value in the range 0 to
254 to indicate that the respective downstream or upstream
subcarrier group i has an SNR of:
(-32 + xdsl2SCStatusSegmentSnr(i)/2) in dB (i.e., -32 to 95 dB).
The special value 255 means that no measurement could be done for
the subcarrier group because it is out of the PSD mask passband or
that the noise PSD is out of range to be represented. Each value
in this array is 8 bits wide. |