Phone backup in case of DSL outage?

[antoinet111]

Hello, how to use a landline telephone in the event of a power cut when you have an ADSL line with a Box (doc without France Telecom number)?

Goods.

[chatelot16]

only solution: backup battery on the box ... inverter that makes 220V so as not to break your head ... or battery at the supply voltage of the box, but beware: if the box has a 12V socket it perhaps wants a precise and regulated 12V ... not the 12 to 14V of a lead-acid battery

same problem for all those who only have cordless phones: it doesn't work anymore in case of power failure

I always have a simple telephone line and an old simple telephone ... even if I have another telephone plugged into the box to call at the minimum rate

[antoinet111]

I have an inverter, but basically it's 30min.
on the other hand to resume a "normal" line it is 70 € of the quarter not?

it's expensive for emergency use.

[chatelot16]

yes a computer inverter is nothing at all ... you need a much bigger battery for real autonomy

do not put a large battery on any computer inverter: they are sometimes very poorly cooled: they know that the battery will be empty before heating, when you put a large battery it burns out!

it is not very useful to have an electric autonomy of several days, in the event of a general power cut, the telephone exchanges do not have a backup power either

it reminds me of the storm of 1999 the phone has been completely cut off everywhere for far too long because of the central power supply

we can also keep a full battery, and turn on the inverter only when we want to call ... but beware the starting of the boxes and the starting of the adsl is quite long

[antoinet111]

so in any case, it will be complicated.
I would keep my UPS in charge in this case.

or simply a larger battery to maintain charge to power the box directly.

Goods.

[gegyx]

In the past, in telephone exchanges, there were buffer batteries to hold in the event of a power failure.
10 to 30 minutes maximum. Normally a generator took over, almost immediately ...
(But everything had to be OK, and the group adapted to support the increase in traffic ...)

***
Thank you for raising this adsl phone bp in the event of a local power failure. I hadn't thought about it yet.

If necessary, if nothing nearby (no laptop, or nearby GSM antenna, also broken down), there is always a way to connect a charged 12V battery.

That of your car is available, even if it means pulling a wire from the cigarette lighter.

I just measured: the voltage coming out of the transformer to power my freebox V, is 12,72V

And by turning the car the battery is recharged in 20 '

Remember to put a 7812 regulator before the box, if use during charging ...

[antoinet111]

what is the mounting of the regulator?

[gegyx]

On 1 and 2 the car battery (12 to 14,5 V)
On 3 and 2, the output in 12V

* With a capacitor between 3 and 2 to complicate it a bit
(10 to 100 micro-Farad)

[antoinet111]

simpler you die.
Goods.

[Obamot]

Antoine is very interested in security issues these days ...