The direct BT staff are normally quite good and appreciate a tea & biccies - or at least the offer. The sub-con ones are a different breed !
If you can get the Cat5e in place before, then it will be a nice easy task and will make his job easier as high noise levels/low sync might take him time to resolve. It will be a two minute task for him to punch te cables in.
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taurus excreta cerebrum vincit
I have the same setup, just let the engineer setup the HH5 for wifi, then logon to the hub - and disable both wifi channels. You'll get a orange light on the front of the hub, but that's fine as your AE will take over.
........and bin your Sky modem/router.
Bin it? surely we should be recycling them!
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It used to be the case with engineer visits that they'd also run a single extension over cat5 if that's what was required. I'm not sure if they still do that or not.
As to your existing extension wiring, it would still work, but you could lose speed and suffer from more dropouts unless you are within a couple of hundred metres of the cabinet. However, it would be an unfiltered feed and would require another filter at the extension socket if you wanted a phone service too. What I do is run an unfiltered feed on one pair, and filtered phone to the same extension socket using a couple of other pairs. (The socket in question has both an RJ11 and phone socket). I wouldn't expect a BT installed extension to work like that.
If it's a proper BT engineer, then they also ought to perform some basic line quality checks too. At least they did with mine. The install ran very smoothly. The biggest delay with simply the time taken to run the line quality checks.
In my case, I already had a master and a nearby power socket. I disconnected the extension before arrival and reinstated it afterwards and move the router just to eliminate any causes of delay.