Flossyrockstar

Does anyone know if a NAS drive can be used as extended storage on a Exacqvision Enterprise VMS system.

Those lines you see are called Moire https://en.wikipedia.org/wiki/Moiré_pattern Getting rid of em is more difficult, could be cheap cameras (the anti aliasing filter if it has one), harmonic interference on cables or a myriad of other situations. Id start with the camera.

That thought did occur to me. The only item I purchased used was a midspan since my switch isn't PoE, but it's a high-end (albeit used) unit I got very cheaply; midspans seem to have no resale. However, that doesn't explain why each one locked up only once over the course of less than a week, unless it's simply coincidence. There's no such thing as coincidence in this game! So your using local mid spans to supply power, I doubt if it's the switch then but it's one less thing out of the chain, how about spikes on the local mid spans supply? Could cause a camera to lock up. Look for high current devices on the same circuit.

Dodgy POE switch??

In what way have you had problems, normally if the viewing devices are in the same address range and are compatible protocol wise there should be no problems, ONVIF normally gives you a get out of jail free card when using NVR's of different manufactures although maybe some of the features like motion detection may not be available.

So you will be using a POE NVR and the cameras will be plugged into that?

A big sloppy hello guys and gals from Biggin Hill!!!

Is this viewed from the web browser or from an NVR?

Providing the NVR's are in the same address range as the Camera it'll work fine, most halfway decent IP cams can multi stream. You don't need another NVR to view the image either one of these http://www.icrealtime.co.uk/ic-stream.php will do the trick.