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Would you be able to draw an ASCII art picture of what you’re asking? I’m having a hard time understanding whether the L3 switch is in the same networking closet alongside the PoE switch, and if the NVR is also right next to the L3 switch. Also, is the NVR powered with PoE? Or it needs it’s own AC power?
Looking at the diagram, I don’t see any issue with the network topology. And the power arrangement also shouldn’t be a problem, unless you require the camera/DVR setup to persist during a power cut.
In that scenario, you would have to provide UPS power to all of: the PoE switch, the L3 switch, and the NVR. But if you don’t have such a requirement, then I don’t see a problem here.
Also, I hope you’re doing well now.