As I understand it, not every telephone exchange contains headend equipment for FTTP/FTTC (OLT etc.). In some cases the fibre from these services terminates at a handover exchange further away, which will allow consolidation of exchanges and eventual sale of some sites once copper is retired.
In the LLU days we had lists of which exchanges had each ISP's DSLAMs in them, but there doesn't seem to be any equivalent resource now. I'm reading here about cases where FTTP ISPs offer differing product availability due to the presence (or not) of enough 10G cablelinks (an Openreach term for the link to the ISP's own network) in each handover exchange.
BT Wholesale is a case I don't understand well - I appreciate that BTW will move the traffic from the handover exchange further, but I'm not sure whether they directly provide routing to the Internet to customers, and it's simply a rebadged BT service, or whether the traffic is just backhauled by BTW to an ISP datacentre.
I spent a bit of time looking at information on central and South London exchanges to see what I could find out. There aren't as many being lined up for closure as I would have thought. Also, I can imagine there is significant cost in maintaining a backhaul network from so many handover points.
Exchanges appearing to have a different handover point:
Shepherd's Bush -> Hammersmith
Bayswater, Kensington Gardens, Chelsea, Sloane, Nine Elms, Battersea -> South Kensington (it must be busy in there)
Paddington, North Paddington -> Marylebone
Monument -> Faraday
Wapping -> Bishopsgate
Southwark, New Cross -> Bermondsey
Vauxhall -> Walworth
Tulse Hill -> Gipsy Hill
Putney -> Parsons Green
Westminster -> Whitehall
Exchanges appearing to contain their own handover point:
Balham (seems odd, maybe some ECI here? FTTP-only appears limited to 330/50, where copper is also present 1000/220 is OK)
Unknown status - usually no FTTP-only sites at present:
Southbank (presumed its own - what is Southbank RS?)
Edited by ft247 (Fri 08-Jan-21 12:38:25)