On 5/13/2010 10:36, Caleb Tennis wrote: > We had a lightning strike nearby yesterday that looks to have come inside our > facility via a feeder circuit that goes outdoors underground to our > facility's gate. > > What's interesting is that various POE switches throughout the entire > building seemed to be affected in that some of their ports they just shut > down/off. Rebooting these switches brought everything back to life. It > didn't impact anything non-POE, and even then, only impacted some devices. > But it was spread across the whole building, across multiple switches. > > I was just curious if anyone had seen anything similar to this before? Our > incoming electrical power has surge suppression, and the power to the > switches is all through double conversion UPS, so I'm not quite sure why any > of them would have been impacted at all. I'm guessing that the strike had > some impact on the electrical ground, but I don't know what we can do to > prevent future strikes from causing the same issues. Thoughts?
I don't know how to account for this in a PoE world, but when I last managed a campus network, we had major issues (particularly in an active-thunder-storm environment) of severe difference in ground-potential between buildings. The only way we could survive was to connect buildings (including free-standing kiosks) with their own "grounds" using glass. Does anybody make a CAT 5 1-to-1 isolation transformer? -- Somebody should have said: A democracy is two wolves and a lamb voting on what to have for dinner. Freedom under a constitutional republic is a well armed lamb contesting the vote. Requiescas in pace o email Ex turpi causa non oritur actio Eppure si rinfresca ICBM Targeting Information: http://tinyurl.com/4sqczs http://tinyurl.com/7tp8ml
