ADSL in a power cut

How feasible is it to maintain an Internet connection in a power cut lasting more than 24 hours. Obviously it has to be ADSL and you need a generator to supply power to your router and PC.

Phone exchange should carry on, either on battery power or with a generator kicking in.

Even FTTC should have a four to five hour backup, with ability to swap replacement batteries in to keep power up

Or 3G.

BT's kit in the exchange will have backup 48V battery (and, ultimately, genny) power.

Does the same apply to LLU operators? Is their exchange kit operated off exchange 48V?

Cable stops when the mains goes off, but that's different.

Yes most if not all will have their own means of powering their kit in the event of power failure, those that don't will probably pay BT openreach for this

Technically it is a -48v DC ...

As for LLUs - if it is along the same lines as other services provided to OLOs in BT exchanges they will have a choice of 230v 50Hz AC or -48v DC. The battery backed supply was always more expensive than the standard 230v service as it was "uninterrupted". OLOs had to make te choice, continuity or lower cost.

Although technically the other responses are correct, it also depends upon how widely the power failure covers.

So if very local, there may be ways to overcome it; BUT ...

OLOs had to make te choice, continuity or lower cost.

Right, Anyone able to confirm?

And then would it be realistic to expect that (for example) Zen's LLU rollout may have made different choices than (say) TalkTalk?

Zen LLU is just a handful of exchanges. The PoP network for GEA-FTTC handover is not a LLU system

You might assume it is on generator - however during the last wave of bad weather we had several alerts from BTW along the lines of:

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Incident Headline: : XXX MUX 301,302 & 101 : LOSS OF SERVICE

Incident Details: At the moment some of your Broadband End Users may be experiencing a loss of Broadband service.

Progress Details: Mains fail in the area, generator is running. This equipment is on non-essential supply. Next update will be upon mains and service restoration.
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So while phones may work ADSL may not. This was a BTW MUX is not always on that feed...

Of course come to FTTx a whole new kettle of fish