It may be that the 8 dedicated non-POE camera Ethernet interfaces on the NVR have been restricted to see only one camera. I'm not sure how or why they'd do that but that may be the case. You can easily test this by plugging in your POE switch into the one of the non-POE camera ports and see if you can detect the cameras plugged into the POE switch, if you can't then just move the POE switch to the LAN Ethernet connection and you should be able to add cameras to the POE switch.
scn101, thanks for chiming-in...
I currently have 11 cameras connected. Whatever 8 that go to the Swann 7090 NVR's POE ports, work like a champ. I then plug one camera into a POE switch, with the POE switch connected to the NVR (non-POE to non-POE), and it works. However, adding another camera or two to the POE switch does not produce any additional video feeds. As it currently stands, the most I can get to work on the POE switch is just one camera...
Of note, there are 8 non-POE ports on the NVR. When the POE switch is connected to port 9 (the first non-POE port), the image shows-up as camera 9. I now have the POE switch connected to the last non-POE ports on the NVR, and the camera image now shows-up as camera 16...
There are two reviews on the Swann website for this product, and one comments on the POE switch option:
"I was able to also connect cameras that are connected to a remote POE switch to the system and have them part of the 16 channels as well. They consider this a more "advanced" deployment but it's not really difficult. You use their camera management software to scan for cameras and then you connect direct to them using their IP. I think they're 192.168.0.x by default. I had a laptop that I statically set to the same subnet and used that to change their IP's to my lan (192.168.1.x).
Once that was done I went to the NVR, changed the non-POE ports as needed to manual and statically entered the IPs of the cameras. Within a few seconds the detached cameras showed up and are recording into the system.
In addition I have also used a combination of POE, and Powerline networking to deploy 2 cameras to my garage. They're also working just as well."
http://www.swann.com/us/conv16-b3mp8c
++++++
I'm not very sure what to make of the above...
Swann level 2 support should be calling me tomorrow night at 8 pm PT. I really hope I won't need a switch, or some form of separate power for each of the cameras...