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Monkfish · 15-04-2005, 16:00

I just checked my NTL cable modem and was surprised to find the screen on the incoming cable was connected directly to the screen on the USB connection. Surely this means that the NTL network is linking the ground line (case) of every PC on the system.

This is fine for those pieces of equipment that are also commoned to the PC ground, but I have a set of powered speakers that pick up a terrible buzzing from the NTL cable screen.

The problem is, I don't know if this is normal, or whether some other user on my local network has a problem with their PC ground. Some people can't even wire a 13-amp plug correctly!! I came across one system that had the neutral and earth connections interchanged!!

I would have thought the cable input would be opto-isolated from the PC connection.

I was thinking of ringing NTL Technical help, but then I thought... Naa

Any thoughts?

15-04-2005, 16:00	#1
Monkfish Inactive Join Date: Dec 2004 Posts: 25	Noise down cable screen! I just checked my NTL cable modem and was surprised to find the screen on the incoming cable was connected directly to the screen on the USB connection. Surely this means that the NTL network is linking the ground line (case) of every PC on the system. This is fine for those pieces of equipment that are also commoned to the PC ground, but I have a set of powered speakers that pick up a terrible buzzing from the NTL cable screen. The problem is, I don't know if this is normal, or whether some other user on my local network has a problem with their PC ground. Some people can't even wire a 13-amp plug correctly!! I came across one system that had the neutral and earth connections interchanged!! I would have thought the cable input would be opto-isolated from the PC connection. I was thinking of ringing NTL Technical help, but then I thought... Naa Any thoughts?