Since no model numbers for the NVR or cam was provided I have a couple of questions.
- Is it a POE NVR?
- Is the cam POE-powered?
If "yes" to both, try this:
- Perform a hard reset on the cam.
- Power down the cam.
- Plug the cam into a POE port.
- Be patient, it may be several minutes before the NVR recognizes the cam.
- You may be asked to provide a user/pass for the initialized cam.