This plan was obviously changed at some point I expect due to "cost" reasons from both openreach and CPs, and so they decided to stop supplying approved modems as well as even to stop supporting the existing ones by announcing an EOL for support.
I think that may have had more to do with the demand for self install and pressure from the SPs to be able to provide their own modem/routers.
Also they clearly made a mistake when they started to supply modems mismatching the DSLAM chipset so ECI modems in hauwei areas and vice versa.
IMHO this shouldn't matter, as long as the modem conforms the the standards then it should work regardless of chipset pair. The issue is someone in BTw not being foresighted enough to purchase the V41's rather than M41s. If they had purchased V41's then we wouldnt be having this conversation now.
I'm sure that was great in terms of bonuses for execs, many of whom are long gone - like the ex-head of Openreach, now running Severn Trent (not exactly an honest company to begin with) into the ground for her bonus.
This
is an issue! Not too long ago Execs usually had a grounding in that particular industry, now it seems like they can swap and change between organisations regardless of what service/product they provide. Make the company profits look good for a few years by false economy get a decent bonus, move on, then watch the fallout from their decisions happen a few years later when they are installed elsewhere and let someone else mop up the mess
Sky have more bandwidth between Birmingham & London than BT do.
Whilst I dont have any figures to hand, Im not entirely sure if that is a good comparison to make.
iirc Sky only have a total of 4 core entry points based on a ring - London, Birmingham, Leeds, London.
BTw OTOH have 20 Core entry points and their core is heavily meshed. So say someone in Edinburgh/Manchester etc would hop on to the core at Manchester/Edinburgh etc which would have its own amount of bandwidth. ie Manchester to London is a straight link, whilst someone on sky would have to traverse Manchester > Birmingham before getting on the Sky Core, therefore Sky would need for bandwith from Birmingham to London. I cant recall Skys no of PoPs - but about 90? BT has a lot more PoPs too. Totally different type of network topology.
Sorry too lazy to go searching, to back this up, but I do have somewhere something that shows Skys Core looking like a square with only 4 entry points, whilst BTs Core is a mesh over the UK covering 20 core locations.
