About a week lead time. Yes, alterations can be made. I have been on the phone to Adam while he has made snr, interleaving and profile adjustments on his control panel to stabalise my old line. As for the 2:1 & 3:1 broadband priority - It's a priority over standard TT customers, not contention rates. His full reply to my query below, also posted elsewhere here.
We’ve been very careful not to mention “contention ratios” on our site as these don’t really exist on our network anymore (Apart from very old IPStream exchanges)
As far as I am aware or rather have been told previously, customers connected to the standard Talk Talk network (not Talk Talk Business) get a standard priority of 7:1 with 7 being the lowest priority and 1 being the highest.
Our Basic XLHome package which is the base offering on the Talk Talk Business network has 3:1 priority on our Talk Talk network which as such gives it a greater priority against the Millions of Talk Talk home users on the Standard Talk Talk network. This is a good thing.
Our XLPlus packages have a priority of 2:1 and the XLPro Package have our highest network priority i.e. 1:1
Of course we can’t really mention anything about Talk Talk on our website (which is a tad difficult when the connections show up as Talk Talk) so I haven’t bothered.
Of course all of the above depends all the other factors like the quality of your line, your distance from the local exchange (or cab if on fibre) and how much bandwidth is available on your local exchange. We do no throttle and always give as much as is available BUT if an exchange does get maxed out and you find that things do slow down then you’ll be better off with a XLPro or XLPlus connection.
On the bundle side, a XLPlus with business line would get fixed quicker than a XLPlus on a home line (care level 2 on the line instead of care level 1)
In fact we’ve only ever had 2 customers who’ve had slowdowns, these were on the Chagford exchange (OpenReach IPstream only). Upgrading them from our 8Mb to 8Mb+ fixed the issue of in the day slowdowns up until last month when a faulty card affect 96 people in the village. Took use several weeks of shouting to fix that one but all 96 customers are now happy, even though only 2 of them were our customers
Having said all that… It has been a while since I queried our prioritisation against standard traffic on the TTB network so I’ll get some more technical BEEF for you as I might be out of date.
Feel free to edit / post my vague wanderings as you will.