Re: Are we sure that Docsis don't do line calibration?
I've noticed this strange low level "wide bar chart" latency on my own connection earlier this year, and it appeared to be coincident with the area being upgraded to D3.1. I've since noticed it appearing temporarily on some other user's BQM (sorry can't find any examples now), and I wonder if the two things are related?
In my case this went on for (as I recall) about ten days and then things reverted back to the normal latency performance I get on my connection (see below). That is for a Hub 3 in a D3.1 enabled area, running in modem mode with a Deco M4 mesh as router:
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