Quote:
Originally Posted by MUD_Wizard
<SNIP>.
Each 256 QAM downstream channel incurs 0.32 ms of additional latency per channel due to interleave. See the table at the bottom of this link:
http://www.kitz.co.uk/adsl/interleav...g_introduction
16 downstream channels locked (as you have) means a total of 5.12ms due to interleave instead of 2.56ms, when you only have 8 channels locked.
Since the BQM only plots every 100 seconds a single spike within that time is enough to produce the yellow spikes you see. I think those are maintenance tasks and data being transferred. The SH2ac also experiences similar yellow spikes in router mode (I have one running on the same line as my Hub 3), though not as often and not as high.
Where hub 3 users only have 8 or 12 channels locked their BQM graph has less yellow spikes and less thickness of blue.
Hope that helps in some way to understand what you're seeing. |
Muddie,
With regard to the bit I've highlighted in red, what are you saying? It seems that you have made the latency additive (as in 16 * .32ms = 5.12ms).
How can that be? Bonding is a parallel function using Frequency Division Multiplexing. It is not additive.
So perhaps you should adjust the explanation you have made for the change in "yellow" on the BQM as between SH2ac and Hub 3. Incidentally, my Hub 3 has seen 8, 16 and now 20 DS channels and the "yellow" hasn't changed at all.