Battery backup is your friend. Even if the batteries are small, a simple DC UPS will filter out almost all AC problems you can imagine. If the site is important to you, you should have battery backup anyway.

bp
<part15sbs{at}gmail{dot}com>

On 8/23/2017 10:39 AM, Sterling Jacobson wrote:
I get power glitches from time to time in our city and it never fails to cause 
one or more of our CRS units to glitch.

They appear powered and running, but SFP+ modules don't communicate until a 
power cycle.

Anyone else see this?

And generally, I don't understand how variations in 110v AC get through the DC 
power wart and cause problems to the CRS.

I mean, shouldn't the conversion from AC to DC inherently clean up some of the 
crap of the AC power?

Or is this a function of the power dipping low enough for brief time, that the 
DC also goes almost out then surges back?

The CRS handles a wide range of DC input voltage, so I thought it would be more 
immune to fluctuations of DC voltage too.

Is that what is causing problems with the CRS maybe?



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