I'm working with some VoIP phones and cameras, and I need to verify the actual power output of a PoE injector or switch port. What's the best method to do this? Should I use an inline PoE tester with a simulated load, a dedicated load device, or check it through the powered device itself? I want to confirm details like the delivered wattage, voltage, class negotiation, and stability under load, not just rely on the spec sheet claims. Any advice would be appreciated!
5 Answers
A good way to check is to log into the switch and run a command that will show you the power details for each port. That way, you get direct information from the device itself.
Check out the Netally Linkrunner. It's been the most useful diagnostic tool I've ever bought and really helps with PoE testing.
You might want to consider a Fluke LinkIQ tester. It's a bit pricey, but it does a fantastic job of measuring power output accurately.
There are some small Netgear switches that can take PoE power on port 1 and actually show if it’s booting up. They're around $80 on Amazon; if it powers up and can pass data, you know you’ve got good power!
If you're looking for precise measurements, consider investing in a proper PoE tester, like those from Fluke, which can run you over $2,000. Just remember that the actual voltage and power at the device may not match what the injector or switch claims due to cable resistance and distance.
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