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Message 11 of 13

Re: Noise transmission

That’s an ONT , and they don’t make any noise , there is nothing inside to make a noise , obviously if there were a fault , a solid state device breaking down , like a resistor, capacitor, ( that type of thing ) it could potentially make a noise but it likely would also smell of burning , and not actually work for long before failing.

TBH, considering the somewhat overloaded extension lead with the ONT power adapter and other devices connected, that’s a more likely source of any ‘ electrical ’ noise , you probably should start with a ‘clean’ power supply to the ONT adapter ( disconnecting everything else ) to see if that helps , also it’s can’t possibly be you can also ‘hear’ your neighbours ONT on the other side of a house wall , that’s also accepting the incredibly unlikely possibility that both your and your neighbours ONT are making a noise in the first place .

As stated previously, if the ‘noise’ is external and its wind noise as air passes over the cable , not much can be done about that , although the cable attaches quite close to the gutter, it may ‘drum’ on the gutter , but that would be if it moves around significantly in high winds , and you say the noise is not weather dependent 

208 Views
Message 12 of 13

Re: Noise transmission

It’s 10.45am. All plugs are as shown in the picture. No noise from plugs, sockets or white box. 
No intermittent base hum and it’s a windy day BUT it is AM.

206 Views
Message 13 of 13

Re: Noise transmission

There is no difference in the ONT operation during the daytime or night time, although small noises may seem louder at nighttime, they aren’t louder at all .