Greetings:
We have a client site that is driving us nuts...
...
I should also add some other points: -- We have observed failures when the building had zero power, except for the UPS ..... -- The building only operates 0600 to 1800, so many failures are occurring after hours. -- There are no RF sources in the building. -- We are not near an airport. -- The building is steel framed and sided -- and a pretty good RF shield --....
Given what I have described, would you think this is an RF interference problem?
No... Unless you have a Gigawatt radar parked next door, I'm highly dubious that it's RF-instigated.
3 DSL routers (cisco 8x7) 1 edge router (cisco 28xx) 1 FR router (cisco 36xx) 1 patch panel 1 telco smart jack (ATM/FR circuit) 1 PBX T1 card 1 patch panel (all jacks went open on the same pair)
Make that Terawatt...
6+ NICs
A) All these things say grounding issues. I have to wonder if the building is fed from more than one power entrance. The blown patch panel especially makes me think the router on one end of the Cat5 was being fed from a different power source than the one on the other. (Which pair was blown?) Given the UPS mention, maybe there's a ground differential issue with it. B) The other, less likely, path into equipment is telco. Those mile-long pieces of copper from the CO are also called "antennas" and they covet static. I have no idea where this location is -- are there thunderstorms around? C) One more possibility; perhaps some piece of equipment in-house is putting large spikes on the internal distribution. Twenty years ago, I read of a building where large [50 HP HVAC] and small [fridges] motors would regularly die. The high-tech gadgets of that era, Texas Instruments calculators, would reset themselves seemingly spontaneously. After MUCH work, they found the BIG copier was putting nasty spikes back on the grid. I vote A) 75% B) 20% C) 5% You do need an EE, one prepared to look at the building wiring/grounding grid. -- A host is a host from coast to coast.................wb8foz@nrk.com & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433