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Fault showing on fibre to tbe premises

Ipmdfm2 — Sat, 06 Aug 2022 20:19:54 GMT

our box shows with a red light under fault, see attached,but everything is working any ideas what we need to do

Re: Fault showing on fibre to tbe premises

Starwire — Sat, 06 Aug 2022 20:34:02 GMT

That’s just the BBU, Battery Back Up Unit. Batteries are most likely knackered.

I assume you have a 4+2 or a 1+1 ONT.

The BBU was only ever there as a Back Up for FVA in the event of a Power Cut.

You can plug the power lead directly into the ONT as when the batteries die the ONT will lose power and you’ll lose service.

Re: Fault showing on fibre to tbe premises

Ipmdfm2 — Sat, 06 Aug 2022 20:47:55 GMT

Sorry what is ONT and FVA and what can we do in simple terms . Our landlines is now digital

Re: Fault showing on fibre to tbe premises

jac_95 — Sat, 06 Aug 2022 21:26:59 GMT

@Ipmdfm2 you can try and replace the batteries as per https://www.bt.com/help/landline/fibre-home-phone-service--questions-about-the-battery-back-up-un

Although this battery backup unit (BBU) was usually only supplied if you had the legacy Openreach voice service called Fibre Voice Access or FVA where you plugged your phone into the Openreach Optical Network Termination (ONT) unit. FVA has been withdrawn and customers are moving to their suppliers digital voice service which is BT digital voice for BT Consumer customers.

You can also unplug the BBU and connect the ONT to the mains or if you need to continue to supply power in a powercut a UPS (Uninterruptible Power Supply) device.

Re: Fault showing on fibre to tbe premises

Starwire — Sun, 07 Aug 2022 05:28:56 GMT

ONT - Optical Network Termination Point, aka the bigger of the two boxes. Basically a Modem.

FVA - Fibre Voice Access, aka Voice Phone Service Supplied over Fibre Optical Cable.

As you now have Digital Voice you don’t need the BBU, as I said you can plug the mains power supply directly onto the ONT.

Re: Fault showing on fibre to tbe premises

DavidM — Mon, 08 Aug 2022 08:53:34 GMT

Hi @Ipmdfm2 and welcome to our community.

Thanks for posting about your ONT. Both @Starwire and @jac_95 advice is perfect. Can you let us know if you're happy with those replies?

Cheers

David