There is a discussion here: https://community.bt.com/t5/Home-phone-including-Digital/Mains-power-cuts-and-DigitalVoice/td-p/2217183
Interestingly, there is a suggestion that lack of power at the street cabinet, while a problem for FTTC (Fibre To The Cabinet) , might not be either for analogue phone lines (line power is passed through passively from the exchange) , nor with FTTP (Fibre To The Premises) - as the optics again run straight through to the exchange (I'm not sure if that's true or whether the cabinet still has some reshaping/amplification role). Seemingly the cabinets have battery backup which should last for at least 4 hours - after than the batteries may be replaced (but perhaps unlikely if the outage is widespread).
- Andy.
There is a discussion here: https://community.bt.com/t5/Home-phone-including-Digital/Mains-power-cuts-and-DigitalVoice/td-p/2217183
Interestingly, there is a suggestion that lack of power at the street cabinet, while a problem for FTTC (Fibre To The Cabinet) , might not be either for analogue phone lines (line power is passed through passively from the exchange) , nor with FTTP (Fibre To The Premises) - as the optics again run straight through to the exchange (I'm not sure if that's true or whether the cabinet still has some reshaping/amplification role). Seemingly the cabinets have battery backup which should last for at least 4 hours - after than the batteries may be replaced (but perhaps unlikely if the outage is widespread).
- Andy.
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