Description: The bits allocation per sub-carrier. An array of 256 octets (512 nibbles), designed for supporting up to 512 (downstream) sub-carriers. When more then 512 sub-carriers are supported, the status information is reported through multiple (up to 8) segments. The first segment is then used for the first 512 sub-carriers. The second segment is used for the sub-carriers 512 to 1023 and so on. The aggregate number of utilized nibbles on downstream direction (in all segments) depends on NSds, and on upstream direction it depends on NSus. This value is referred here as NS. The segment number is in vdsl2SCStatusSegment. Nibble i (0 <= i < MIN(NS-(segment-1)*512,512)) in each segment is set to a value in the range 0 to 15 to indicate that the respective downstream or upstream sub-carrier j (j=(segement-1)*512+i) has the same amount of bits allocation. This table is from draft-ietf-adslmib-vdsl2-01.txt.