T i m wrote:
On Sun, 14 Mar 2021 13:34:01 +0000, Jeff Layman
wrote:

This doesn't bode well for when the copper wires go and we all have to
use VoiP for a fibre connection. How long will a backup battery will be
required to power the phone/router when the power goes down?

Quite some time. My old NTL cable router requires 12V @ 1.5A so worst
case that's ~20W. A fairly common UPS would be ~600VA so ~15 hours
(down to 50% DOD?) maybe 10 if there was an Ethernet switch involved
or 8 if you included a DECT / VOIP phone?

You're not comparing the right things! A 600VA UPS can provide up to
600VA, that's *power*, it doesn't tell you for how long it will
provide that 600VA. Usually a domestic/computer UPS will only provide
its rated (i.e. maximum) power for 20 or 30 minutes to give you enough
time to shut down gracefully.

--
Chris Green
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