More info about SWICHING power supply http://www.smpstech.com/tutorial/t01int.htm#SMPSDEF
Use power adapter with torus or regular transformer…
Use shellproof UTP…
Mikrotik, Is there revision on the routerboard532 that will change the switching power supply design?
jfan,
The switching power supply they are referring to is powering the 532 and not onboard.
I meant remove the onboard switching power supply , or get an RB511 if theres any still around to try out.
rb532p1 comes without the onboard power supply.
hi there,
some time ago we had a similar problem. we shielded everything, but that not helps.
the things were working out, when absolutely everything “came in” the metal box of the routerboard. even and the suplying adaptor, i. e. the lead cable go to the metal box with 220V, and inside is the supplying adaptor for the device, accordingly everything is grounded.
so, none PoE… had works out by us.
I hope this to be workable in your case.
best regards,
C. G.
Hello everbody
I have to be sure, before I tell you somthing.
now we have been in the air for all most 3 weeks.
with out any problems 
we switcs from 48V to 18V power on the router board
It was the 48V power that make the noise, we switsc it to the same model
no noise, but afer 1 day, it was back and we switch to 12V
How someone of you can use it
Are you using shielded Cat5 cable?
If not then you should…
If you are using Shielded Cat5, then be sure and ground the shielding at both ends…
before we swits power supp.
we have Shielded kabels, thats is groundede
we have special power kabels
router board put in metal box
as you can read we have try everything before
here in denmark we have a service that can finde nosie, if it make problemes for other. and they find out it was the power supp.
EbeltoftsNet thanks for keeping us all up to date with this, I’m sure many will find if useful and I’m pleased you have fixed your noise problem.
yea, thanks..
im assuming the PSU on the Router board? if so what did u do to fix it?
tks
nothing only switcs power supp. to 18V insted off 48v