"Dr S Lartius" wrote in message
...
On Thursday, 21 November 2019 10:28:36 UTC, NY wrote:
"Graeme" wrote in message
...

Keep seeing stories regarding BT's planned switch off of analogue phone
lines in 2025 but, knowing little about telephony, and having no
particular interest in the subject, don't know what this really means
for
the average home phone user.

Thoughts?

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. 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.

It does with both FTTP and FTTC because with those there
is no way to provide that power anymore. While the wires
are still there with FTTC, the micronode is in fact powered
by the consumer. And even with FTTN, the node doesnt
have the capacity to supply power to the consumer anymore.