No idea about your interleaving level, but if you've had VDSL switched on for a while and you are still maintaining the full 40/2Meg product, then my guess is interleaving is very low, or nil ?? Someone who knows the letters on the stats page will advise shortly, I'm sure ??
If you went for the 80/20, it appears you would again receive the full whack !!
That's an interesting point. Jamie seems to be banded on a 40/2 service, so clearly he does have enough headroom to do better than that (achievable rates 96/32.5), if he wished to pay for that. Why is it not a 40/10 service though - is this a particular ISP IPTV thing, or have they somehow forgot to change the profile?
[Edit] Now looking at his later post, I notice that the U1 band doesn't seem to be in use and tones ~32-450 have no bit loadings. I wonder if this has anything to do with bandwidth reservation for IPTV? (~420*4.3125kHz=1.8Mb/s?
)
Anyway back to Jamie's question. An Interleaving
Depth of 2177 I would suggest is pretty high. The highest I've seen on my own line was something like 1537, and currently it's 1233-ish. In my case it seems to be the result of very rare, but extremely high (in the millions/min) rates of (recovered) FECs. It may be that Jamie's line has experienced something similar.
However, as to achieving the full whack on 80/20, I would suggest it's debateable. The excess achievable over the 80/20 product banding will not help him in that respect, and since the overhead of that Interleaving depth is
R/
D, which in his case is 16/46=~35%, I doubt very much that he would get the full 80Mb/s DS. Again, with reference to my own, my R/D=16/80=20% and I therefore only achieve ~78Mb/s DS.
The other useful parameters here to see would be the INP and delay levels, which if I recall correctly are just a little further down the same stats page as he has posted.
HTH
