Network Switches

My point is that regardless if whether the digital signal is perfect, it is susceptible to RF/EM noise riding along or being created by power supplies and any gear (including switches) that pass electric current.

Sorry but I still don't follow how the digital signal can be susceptible to your "RF/EM noise" , and were it to be possible why is that not considered to be a problem by the professionals. You do realise that in the UK we have DAB radio ?. It is digital all the way from the microphone to the receiver.

What @david 22 in UK?? Are you asking whether the sole purpose of an audio system is get sound coming out of it? An Alexa speaker does that job very well.... so...

No, I am saying that in this case the sole purpose is to safely deliver the audio data. The only difference between an Alexa speaker and the most expensive hi-fi system is the quality of the DAC, the amplifier and the speaker(s). The data it receives is identical. You are thinking of analogue audio.

Back to my original question.

Is there anybody who can explain why the professionals need only normal cables and switches?.

What are they doing differently and why can't I do that on my system?

@david_uk_22    

Sorry but I still don't follow how the digital signal can be susceptible to your "RF/EM noise"

Ok David you have to stop this.  Again I am NOT saying that the digital signal is susceptible to noise.  I have gone to great lengths to say quite the contrary.  This is NOT about the signal so please stop.  What I am saying is that noise can get introduced to your system equipment (not the friggin signal!) via electrical gear including routers and switches etc just like power supplies in any other piece of gear can create RF/EM noise that get transmitted through the air or hitches along the foil/shielding on an ethernet cable (or any other cable) causing an affect on other equipment - and consequently sound quality.  Please, this must make some sense to you.

Again I am NOT saying that the digital signal is susceptible to noise. I have gone to great lengths to say quite the contrary. This is NOT about the signal so please stop. What I am saying is that noise can get introduced to your system equipment (not the friggin signal!)

OK three_easy_payments   now you have to stop this

You said in your previous stab at an answer;

and I quote

My point is that regardless if whether the digital signal is perfect, it is susceptible to RF/EM noise riding along or being created by power supplies and any gear (including switches) that pass electric current

Oh dear, you seem very confused on the subject.
And once more, please, please read my posts more carefully.I did not question the correctness of what you said. I am simply asking why this is not deemed to be a problem by professionals.

Please, this must make some sense to you.
So I will try again.

Is there anybody who can explain why the professionals need only normal cables and switches?. What are they doing differently and why can't I do that on my system?

And I would appreciate replies from people who are not confused and who do not keep contradicting themselves.
Hey, you know what? I am going to telephone the BBC's technical support department for a definitive answer. It is what I should have done in the first place, I will let you know their answer

@david_uk_22

"It" meaning all of your audio gear, and NOT the digital signal! All of your gear is susceptible to to the RF/EM noise created by digital equipment and their power supplies, etc.  Sorry for the ambiguous "it".  Is this more clear now?

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