Network Switches

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

@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?