Thanks, @BlakeRichardson, and @Bruce Yeah, it is all Cisco Switches the vast majority of which have 802.3at capabilities. I would assume there would be some sort of Alert or Message of the heater wanted to turn on but couldn't. I also expect the internal temperature of the camera to be a good bit warmer even without the heater. Assuming the heater kicks in at an internal temp of 32f an exterior/ambient temp of 20f I would expect to turn on the heater.
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