Why do I need a separate Optical Network Terminator (ONT)?

This takes the signals and data from the fibre optic cable and converts them into a form which your Fibre Hub can use to deliver superfast broadband around your premises. Its technical name is Optical Network Termination unit (ONT). In turn, your Fibre Hub talks to devices like your computer.

Why does the Openreach ONT need to be fixed to a surface?

Your Openreach Optical Network Terminator (ONT) needs to remain fixed to the wall or skirting as the thin green fibre optic cable can be delicate. Please be careful when cleaning around it and make sure everyone knows not to tamper with it. You need to ensure the mains plug remains connected whenever people are likely to need access to broadband. Unplugging the mains will cut off broadband immediately but inserting the plug again will restore normal speeds within a few minutes.

How do I troubleshoot my Optical Network Terminator (ONT)?

Please see Troubleshooting the Openreach modem.

What does the reset button on the back of the Optical Network Terminator (ONT) do?

The reset button enables you to power cycle the modem without disconnecting the power cable. However, we only want you to use it if you've contacted us and we've asked you to do it.

WARNING - pressing for 10 seconds or more will return the device to factory settings and may render your broadband service unusable.

What is the BBU port on the back of the Optical Network Terminator (ONT) for?

BBU stands for Battery Back-Up. This port is not active at the moment, so you should not plug anything into it. We may activate it in future.

What are the Tel 1 & 2 sockets and light on the Optical Network Terminator (ONT) for?

These are not active at the moment, so you should not plug anything into the sockets. We may activate them in future.

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