I’m going to buy one of your 8 port POE switches but needed a bit of clarification. I have a cisco 56v .55amp power supply that I used to use for a cisco 1140g AP. Can I use that to power the switch and the two Dahua IPC-HFW4300S camera’s I’d like to use this with? Eventually I’d like to expand to 6 cameras, and would probably need a bigger power supply, but this is still the testing phase. I’m worried about the higher voltage being an issue.