Problem with degrading WLR to encourage migration to FTTC is that we have locations where FTTC collapses within 40mins of a power outage, but WLR stays up for hours because the exchange kit is on maintained power. That's why we keep WLR. FTTP from a provider who can provide the same resilience to power outage as we have on WLR is not yet available and may never be.
Since FTTP is powered from the exchange (and a larger "head-end" exchange at that, not an itty-bitty local one), it will have excellent backup power facilities.
The Openreach FTTP network is completely passive - no powered cabinets - so there's nothing else in between that needs to maintain power. Just your home, where you can install a UPS of whatever capacity you like.
In comparison, some of the altnets (and Virgin) have powered cabinets, likely with little or no battery backup.



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