nanog mailing list archives

Re: Presumed RF Interference


From: Iljitsch van Beijnum <iljitsch () muada com>
Date: Sun, 5 Mar 2006 23:59:20 +0100


On 5-mrt-2006, at 23:37, Jon R. Kibler wrote:

1) How could a bad ground cause DSL line noise that ia inaudible? Also, the noise is on the telco side, not the LAN side. 2) Why would it be blowing DSL routers that are isolated from the LAN by a switch and another router? And, all of this equipment is in the same rack, on the same ground, and on the same UPS.

This makes me think of a place where they used copper lines that ran alongside rail road tracks, and each time a train came by the leased line modems would go haywire. Electrical trains put a lot of current in the ground...


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