Re: POE switches and lightning

[Paul Timmins <paul () telcodata us>]

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 use these on any cable that leaves my building.

http://www.amazon.com/APC-PNET1GB-ProtectNet-Standalone-Protector/dp/B000BKUSS8

It seems to play well with PoE (I put mine before the injector), and 
also works well with T1s and POTS.

-Paul