Noise from the RCC SP port

[iz0tws]

HI, I just noticed that I can hear a strong (white) noise if I put hearphone in the SP port of the RCC unit.
This noise is also pushed inside the IC7100 if I put the volume to zero and I connect the earphone to the SP port of the radio frontal.
I tried to detach everything from the RCC and I can hear also if I just plug the power supply without nothing else attached (no ethernet cable, no usb, no icom7100 cable).
What it can be? Is it possible to reduce it?

[Totteflyg]

I was setting up a remote remotrig. whited a Yaesu 7900 in the weekend.
And I did get noise too, I change back the Audio quality from 0. To 2.(default)
Running over 4g prepaid data card tryed to save some data.

Best regards

Thomas

73
SM6RHA