Network Switches

OK accepted
But It doesn't have to be clear because you are still not addressing my original question

So If all of my gear is susceptible to RF/EM noise then why is, and this is my only and original question , the gear in a professional network not susceptible to the same type of noise?
You have only given me your theory on what happens on a home network.

I ahould be getting my call back from the  BBC within a couple of hours so I guess I will know by then

@david_uk_22   

So If all of my gear is susceptible to RF/EM noise then why is, and this is my only and original question , the gear in a professional network not susceptible to the same type of noise?

Because the BBC or any other professional network is only concerned with broadcasting an accurate digital signal.  They could care less what the effects of RF/EM noise are having in their own studio - which would be the only positive result that using quieter electrical gear would have at their point of broadcast.  Anything they do to minimize this type of noise in their own space would have ZERO impact to end user.  It's up to the end user to decide whether he/she wants to reduce the negative affects of ALL potential sources of electrical-based noise, including routers, switches, transformers, and power supplies.  Again, I agree that their digital signal that arrives in your home is perfect - yet your overall listening experience could be improved with quieter gear - none of which alters that perfect digital signal.  Make sense now?

Geez.... some toxic comments here from "everything-sounds-the-same" crowd. Relax, it's just a hobby. Nobody is pointing a gun in your head forcing to buy a switch. Don't buy it. Why do you even read this thread?

Thanks again but no

They could care less what the effects of RF/EM noise are having in their own studio

(and I assume you meant couldn’t)
I am not talking about noise picked up in the studio. That is pre digitizing which clearly would contribute to the quality audio. I have no disagreement there

I am talking post digitizing and  " the negative affects of ALL potential sources of electrical-based noise, including routers, switches, transformers, and power supplies " before it gets to my house.

How can that leave, as you say a 'perfect signa'l' derived from the final noisy audio circuit to my router but then a switch can introduce problems in the very short run to my DAC?
Perhaps anybody experiencing poor sound really ought to be questioning the ability of their DAC to reproduce the audio properly and to isolate the audio output from any 'noise' on the inputs?
In any event, I just read an ad for one of the 'audio' switches and it claims to improve, not clean, any audio or video passing through it       HUH?

@david_uk_22   

I am talking post digitizing and " the negative affects of ALL potential sources of electrical-based noise, including routers, switches, transformers, and power supplies " before it gets to my house.

In my view (I know others disagree) there is nothing that can be going on in that BBC studio as a result of electrical-based noise that's going to pose a negative impact on the digital signal coming into your house.  The digital signal is just fine leaving BBC and just fine when it arrives to your home and even your DAC.  I'm simply saying whether it's a nearby TV, florescent light, network switch, router, or amplifier...everything near your audio system that is powered by electricity has the potential to cause noise.  Reducing these effects can be beneficial.

Again, I am not in the camp that any of this is related to the digital signal.  I had to move my router 10 feet away from my rack because initially it's close proximity to the rest of my gear was causing very loud "motorboating".  In this case the digital signal was of course not degraded bu there was incredible noise coming through my speakers due to the RF/EM noise.  This really shouldn't be confusing.