On 21/11/2019 13:07, NY wrote:
"Dr S Lartius" wrote in message
...
Everyone will need to buy either new phones or else a converter
(essentially
analogue/digital interface) to allow existing analogue phone to work.

Either way, power will be needed for these phones or converters,
which means
that a landline phone cannot be relied on during power cuts. When we
were
having up-down-up-down power cuts the other night, I was able to use
an "old
fashioned" corded phone to phone the power distribution people.

The converter or new phone could include a rechargeable battery,
perhaps of the same size as common non-rechargeables, acting as part
of a mini-UPS.Â* As an option, the phone could then optionally ring
you, there or elsewhere, to tell you that the power had gone off/on ...

However, a switch-off of the analogue phone signal does not _require_
a switch-off of the DC power which is applied to the distant end of
your telephone feed.

No, although as the UK moves gradually towards FTTP rather than ADSL or
FTTC, the ability to take DC power from the exchange or cabinet will be
removed.

Good idea to have a rechargeable battery as a short-term UPS - why
didn't I think of that?

I had one for a few years. When I moved in, the phone line had been
re-allocated to another house and there were no spare cores in the
multicore to the telegraph pole. I therefore ended up with a DACs unit
on the wall to multiplex my phone onto a line shared with another house.
It had its own battery to power it, that recharged from the phone line
when it was not in use. It also had a mains charger, in case unusually
heavy usage drained the battery faster than the line could recharge it.

Of course the problem with rechargeables is that you only notice that
they have died when you need them!

SteveW