On Thursday 13 May 2010 11:36:35 am Caleb Tennis wrote:
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
On May 13, 2010, at 2:26 PM, Mark Mayfield wrote:
About a month ago, we had a lightning strike near our main campus.
We lost one POE Cisco 3560 completely (apparently blown power
supply), and in a separate but nearby building, another 3560 lost
the ability to deliver POE, but continued
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.
Perhaps there was a move of the earth-level relative to the neutral
line.
I have no idea how neutral-line to earth potential is
On 5/14/2010 16:42, Ingo Flaschberger 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.
Perhaps there was a move of the earth-level relative to the neutral line.
I have no
On 5/14/2010 19:00, Seth Mattinen wrote:
On 5/14/2010 16:42, Ingo Flaschberger 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.
Perhaps there was a move of the earth-level
My first guess would be the lightning was close enough/powerful enough,
to send out an EM Pulse which got picked up by the copper going to the
devices. This EM Pulse may have been interpreted at the switchport as
the device relinquishing power?
Had you tried just unplugging one of the devices
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
On 05/13/2010 12:19 PM, Larry Sheldon wrote:
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
While the equipment may well be affected by an EM pulse, if the gear returns to
normal after a power cycle, then the equipment vendor didn't do their job fully
developing the product. A product should be tested to take such pulses and
should recover provided it has not suffered a catastrophic
About a month ago, we had a lightning strike near our main campus. We lost one
POE Cisco 3560 completely (apparently blown power supply), and in a separate
but nearby building, another 3560 lost the ability to deliver POE, but
continued to operate as a switch. Both had to be replaced. Both
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
On May 13, 2010, at 2:24 04PM, Daniel Senie wrote:
While the equipment may well be affected by an EM pulse, if the gear returns
to normal after a power cycle, then the equipment vendor didn't do their job
fully developing the product. A product should be tested to take such pulses
and
On 05/13/2010 02:52 PM, Steven Bellovin wrote:
On May 13, 2010, at 2:24 04PM, Daniel Senie wrote:
While the equipment may well be affected by an EM pulse, if the gear returns
to normal after a power cycle, then the equipment vendor didn't do their job
fully developing the product. A
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