On Thu, 21 Nov 2019 15:11:18 +0000, Andrew wrote:

But those green cabinets have a power supply (and a non-smart meter !!)
so they could still supply DC from there (in theory).

Whne the mains is present... I think most cabinets have batteries to
bridge short mains interuptions without the kit rebooting. They may
have enough capacity to keep the cabinet alive for 3 hours or so
which is (IIRC) about the time that the batteries in a FTTP box last.

--
Cheers
Dave.