CPE210 Reset to Factory default with 8 IP cameras after few days
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Then you have grounded your CPEs according to method 2 in the IG shown above even if you are not aware of.
Another fact that you might not be aware of is that in most countries there are safety guidelines which need to be followed by electricians when installing outdoor equipment in order to avoid lightning strikes caused by flashovers if the device is grounded via the mains power socket indoors. For example, that's from the U.S. NEC regarding safety guidelines for a professional installation of any outdoor device:
It even applies to SAT installations.
And yes, I lost a CPU main board of a $25,000 mid-range computer two decades ago due to a lightning stroke into phone lines coming through a modem to the board. The computer was even grounded as every other professional equipment in a data-center rack is grounded through a ground terminal on the device (as almost any enterprise-class switches, servers etc. have). But the modem didn't have surge suppressors.
With over 7,000 devices in the field our company only had two RMA'ed devices in last 16 years which became unresponsive due to ESD and both devices had been installed by amateurs w/o grounding, not by our professional staff.
Anyway, that's just for the record of this thread's subject. I won't argue with you any further about grounding outdoor devices.