I see (I think). In this case we're talking mainly about DSL monitoring programs, and the common factor is the Broadcom CLI. Assuming that Broadcom are consistent in the way they define the reported QLN values, then I suppose that it's best that we all use the same terms. But it's possible that the JDSU uses a different definition, so we can't directly compare JDSU QLN graphs with those in in our monitoring programs.
I seem to recall someone posting a link to a JDSU manual. Does anyone have this manual, and does it define QLN as they use it?