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If an FTTC cab’s battery goes flat and there’s no mains, how does it ever come back on again? If the mains isn’t always off then the batteries will recharge and presumably service will come back up. If the mains is off then the batteries won’t recharge and the services will be down for good. Perhaps it’s a design limitation that the PSU cannot draw enough current to drive the FTTC hardware and recharge the batteries at the same time. Is it the case that once the batteries go flat the fttc hardware can’t provide service while the batteries are in the recharging state? ie the batteries have to recharge to a certain level before services become available. That level is presumably 100% because the downtime is 70-80 mins. It’s a state machine and I don’t have a picture of it.

Like the video 

@tiffy If the power to the Cab has failed they just change the batteries every 8 hours or so.

Ahh, yet another scenario I hadn't considered, a complete mains outage, was thinking more of a battery failure or charging issue with periodic mains loss!

Still, would have thought that TT would have been made aware of such an occurance if this is indeed the case and would have passed on the information to effected customers especially when they actually raised an issue with their ISP in the first place.

Can't be sure but from the symptoms it could well be a power problem at the FTTC cabinet, the fact that it is a regular interval is suspicious. Have look at this excellent U-tube video.. https://www.youtube.com/watch?v=TBMoR1NMwVg 

@tiffy If the power to the Cab has failed they just change the batteries every 8 hours or so.

On the other hand do TT not consider a noise margin of 0.0 to be possible problem? 

It could be that the DSLAM has lost power, is lasting 7 hours on batteries and the down time is batteries being changed?

Something that would never have occured to me I must admit.
Obviously that scenario would effect all VDSL subscribers on that cabinet so a considerable amount of queries/complaints would be expected to various ISP's who via their respective diagnostics would be aware that the DSLAM was down.
Wonder if this would be recognised as the "common factor" with a number of reported issues involving various ISP's who would be unlikely to have any occasion to talk to each other?

Would an OR engineer change out the DSLAM backup batteries without establishing that the previous set were actually being charged?

Welcome to the Kitz forum. 

. . . I've noticed that the connection drops out every 7 hours (approx) and is then off line for 70-80 mins. . . .

That is an interesting observation. j0hn's suggestion as to the cause make sense to me as a set of SLA batteries, when brand new, could maintain the equipment in service for eight hours.

If you would be willing to disclose the cabinet number (and/or your location) we might be able to find some information regarding the infrastructure hardware.

Damn, lost that section now; time has moved on and the modem only keeps a certain window of data, doesn’t go back far enough. I’ll be watching out for another such event. All good recently.

by, clutching a

It could be that the DSLAM has lost power, is lasting 7 hours on batteries and the down time is batteries being changed?

I can't think of any other reason for such a gap in service so frequently.

Check the local roadworks website for works upcoming next to your cabinet.

compliance

clippers