Replacing original BT FTTP ONT?

[JohnnyUK]

Hi All

I'd like to replace the huge original ONT with battery backup, with a more modern and smaller unit.

I understand that the latest ONT being rolled out is this:

https://www.ebay.co.uk/itm/196012506719?mkevt=1&am...

Is it a case of unplugging the incoming fibre plug from one unit to another? Is any config required?

I'm all good on the LAN side in terms of knowledge and equipment.

Cheers

John

[x5tuu]

Other than size is there any additional advantage of a newer ONT?

[JohnnyUK]

I have a 2.5Ge WAN port on my router, but obvs the actual fibre speed is 900Mbps, so no real advantage, except aesthetics.

[theboss]

That's an XGSPON ONT whereas Openreach FTTP is widely based on the predecessor standard GPON. There are undoubtedly exceptions where they have been piloting the newer tech and might be rolling out XGSPON on new deployments routinely for all I know, but nonetheless I suspect that if you plug that ONT into a GPON service it won't work as the wavelengths used are different. Happy to stand corrected!

[119]

A friend of mine and my brother have just had the newer small 4x4" ish box installed and then goes from that into their router.

About the same size as the old phone plug socket.

[Riley Blue]

[redacted]

[quinny100]

You'll need Openreach to swap it out for the reasons below, but I'm not aware of any mechanism to request a different ONT. Your best best would be to raise a fault and be nice to engineer who turns up.

Openreach will be restricted to what they can deploy in any location because the ONT has to be compatible with the OLT (head end) in the Exchange - and there are different vendors (Huawei, Nokia, Adtran) and standards (GPON, XGSPON) deployed across the network. The standards are written to technically allow cross vendor solutions, but it would be beyond most network operators risk appetite to deploy it in a big production network.

Even a like-for-like swap won't work unless it's configured on the OLT. In a PON network all connections from the same fibre splitter receive all receive the same light. The data is encrypted on the fibre and addressed specifically to each ONT, so each user can only see their own traffic. If you change the ONT, the address won't be correct and you won't see any data.

[JohnnyUK]

quinny100 said:

You'll need Openreach to swap it out for the reasons below, but I'm not aware of any mechanism to request a different ONT. Your best best would be to raise a fault and be nice to engineer who turns up.

Openreach will be restricted to what they can deploy in any location because the ONT has to be compatible with the OLT (head end) in the Exchange - and there are different vendors (Huawei, Nokia, Adtran) and standards (GPON, XGSPON) deployed across the network. The standards are written to technically allow cross vendor solutions, but it would be beyond most network operators risk appetite to deploy it in a big production network.

Even a like-for-like swap won't work unless it's configured on the OLT. In a PON network all connections from the same fibre splitter receive all receive the same light. The data is encrypted on the fibre and addressed specifically to each ONT, so each user can only see their own traffic. If you change the ONT, the address won't be correct and you won't see any data.

Got it! Thanks!

[Blockbuster]

Don’t do it.

Every ONT on the network has its serial number registered against the circuit. If you buy your own one and plug it in, it won’t authenticate.