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Author: JeanDavid Big gold star, 5000 posts Old School Fool Add to my Favorite Fools Ignore this person (you won't see their posts anymore) Number: of 189601  
Subject: Re: Router Question Date: 6/12/2014 8:07 AM
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There are lots of problems with doing that [running CAT6 from one building to another], due to ground loop, common mode noise, and lightning protection problems.

I'm pretty sure none of those are a problem with underground CAT6. Twisted-pair Ethernet is transformer-coupled, meaning there's no direct electrical connection between two pieces of equipment connected with Ethernet... specifically to avoid having ground loops.


OK: the transformers would solve the ground loop problems.

Still to be dealt with are the common-mode noise. It would depend on how much potential difference there is between the grounds at each end of the cable. There is capacitive coupling unless the transformers are extremely well made with electrostatic shielding. And the problem of dielectric breakdown in the transformers.

I have in front of me a dual PCI Express 10 Gbit/sec NIC and do not see the transformers. That does not mean there are none; just that they must be very small. The board has a really big heat sink at the far end (away from the CAT6 connectors, and a smaller one near the connectors with a fan on it. There are a lot of really small IC chips visible on both sides of the board.

So you may be right, but I think if the radio connection between the two routers is not reliable, I would go with a fiber optic link, buried.
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