Make sure your using the right kind of injector for the nanostations and not the typical 48 volt , I think they use 24 volt poe. Make sure you have good line of sight and your settings are correct...
I have 4 4mp ip cameras going over nanostations 2.4Ghz. set at 15FPS. idon'thave any problems. about 100 feets from the NVR and cameras and annotations are 30 feets high.
I have good experience with [TABLE="width: 580"]
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[TD]D-Link DGS-1008D 8 Port Gigabit Switch[/TD]
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Came very cheap and hasn't let me down once in 4 years
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