I'm of the belief that DLM pays attention to other stats when considering removing interleaving, particularly FECs. Your FECs aren't very high but I still think a cap might shake the interleaving.
I'm also of the same belief.
Note that SIN 498, governing VDSL2 modems, doesn't require that CPE modems return much in the way of error counts to the DSLAM - certainly not as much as we see in the statistics printout.
However, what it does require is the following:
- FEC
- ES (Errored Seconds)
- SES (Severe Errored Seconds)
- FECS (FEC Seconds)
The last item is not the FEC counter. The FEC counter and FECS counter have the same relationship as the CRC counter and the ES counter have. Neither FECS nor ES should go over 900 in a 15 minute period.
My belief is that DLM, when it makes decisions over de-intervention, also takes into account the FECS counter. It is a shame that we never get to see it.