You’ll find this might happen a few times after initial installation. The ONT is negotiating a connection on the network. To fix a red light on a modem, power cycle the modem by unplugging it for at least 30 seconds, then plugging it back in and waiting for it to fully reboot.

You have a fibre connection issue – check the fibre connection in the bottom of the ONT. Check the power cable is properly in (the one on the left-hand side) and that the mains connection on the other end is switched on. Here’s what those lights really mean… Light Think of LOS as showing a cut in the fibre connection, whereas PON is indicating your connection at the other end of the network. Good to know: Like your hub, your ONT always needs. Underneath the box, from left to right, are 3 connectors – power, LAN out, optical fibre in, That middle one is the one that goes to your router.Īs you can see there are 4 lights at the top of the OpenReach Full Fibre modem – Power, LOS (Loss of Service or Loss of Signal), PON (Passive Optical Network) and LAN (Local Area Network – but you know this one, right?). And, if its after your activation date, the PON light should be green too. They’ve gone through a number of different models but, right now, are installing a compact little box made by Nokia. No matter which ISP you’re with, OpenReach will have installed this for you and it will be one of their branded boxes. One aspect of the installation is a wall mounted modem (known as an ONT – Optical Network Terminal), which goes between the fibre connection outside and your router. I can connect, but no internet and the alarm button is solid red. L If a call is kept on hold for more than 9 minutes, an alarm tone starts to sound and the ringer indicator on the handset flashes. On Tuesday we had no power for a good part of the day and when power returned, my modem didnt work again. With vastly superior speeds over traditional fibre broadband, it’s slowly rolling out across the UK. Solid red light on alarm - dsan zhone modem. If the light remains red, please check the Network status page for any known issues. If the light changes to green you will be able to browse the internet. Congratulations! If you’re reading this then I’m guessing you’ve upgraded to Full Fibre, or FTTP (Fibre to the Premises) as it’s also known. Alarm Indicates if there is a problem with your fibre connection.

Red alarm light on modem