Thanks for the feedback Brian. Sorry we werent able to fully solve your issue, but at least now you know the area's which are problematic for your line.
That hlog is really good considering your line length and as b*cat pointed out it would tend to suggest nothing wrong with the physical line itself - just interference coming from somewhere.
By the way, this Zyxel 3300N modem is a nice bit of kit
Since finding out about the chipset, this router is now one of those that I have my eye on so thanks for the info.
For some reason my line seems to perform much better with BCM, and not so good with TI/INF/Lantiq
It ticks all the right boxes 5x (not just 4) GbE ports and it supports SNMP, something that a lot of routers dont these days.
Is the WiFI performance ok? - I have an area in my lounge which can be a deadspot with some routers. Unfortunately that is where the (smart) TV is located.
Im also impressed that you seem to have a good line of support with this router.
If you do manage to get a CLI reference manual that would be a real bonus.
I think theres just one thing that I'd miss... and thats BE's HG612_stats