Spark

Sounds like a problem I had when going to v2.3.9 What version are the cameras? - It was suggested that the cameras need to be at (least?) v5.2.0 viewtopic.php?f=19&t=42179

Use TFTP "recovery" as that does not do a "language check".

There are a few POE powered POE switches listed at http://kb.netgear.com/app/answers/detail/a_id/24268/~/current-range-of-power-over-ethernet-%28poe%29-switches I am sure there are others.

I thought you said you haven't tried plugging the computer into the NVR POE port yet. Depending on what operating system you have on your computer, you may also need to try disabling any firewall you may have (just to test).

You don't even need to do that if you use the SADP utility to change the IP addresses of the cameras.

The cameras don't have DHCP enabled, so they are not asking your router for an IP address. In this case use the SADP utility to change the IP address of the cameras to suit your 192.168.1.x network, OR, change the IP address of your computer just like I mentioned previously if you connected your computer to one of the NVR POE ports. None of your problems are camera or NVR related. The are all basic / more than basic networking problems.

My point is, once you get over playing with the settings, you don't need access to the camera menu. "Virtual Host" is convenient, but you don't need it every day.

In that case, As you already know the IP addresses of the cameras (eg. 192.168.254.2), you won't need to use the SADP utility. Why do you want to access the camera's menu? You should only need access if you want to change a setting that is not available in the NVR menus.

In the NVR menu, do you have Configuration, Network Settings, Advanced, Enable Virtual Host? If you do and you enable it, you will get a link to each camera in Camera Management. It will be something like http://192.168.1.6:65001 (for camera channel 1). This gives you access to the cameras on the NVR POE ports via the NVR LAN port. Do you know how to manually change the IP address settings of your computer? If so, if you do what I suggested previously, you will be able to access cameras via the POE port of the NVR. I don't use the Ezviz app so can't help with that. iVMS-4500 & IP Cam Viewer both work (Android).

There are lots of ways you can connect the various parts to do what you need, but I suggest; - Connect the cameras to the NVR POE ports. - Connect your computer, NVR LAN port & router to the switch. - You should be able to view the camera images via the NVR, both from a Web viewer & mobile application. - You should be able to most of the basic camera setups via the NVR menus. NVR firmware 2.3.9 allows access to the camera menus via the NVR, but you probably also need camera firmware 5.2.0 to work with this NVR firmware. There is a setting that must be made in the NVR to enable this though. If you don't have NVR firmware 2.3.9 and you want access to the camera menus, connect your computer to one of the NVR POE ports (or connect an additional cable from the NVR POE to the switch) and use the SADP utility to find the IP settings of the cameras. - set up your computer IP address to match the camera network.

That says allot - how about trying to follow the standard exactly, and see what difference it makes. My guess is it will make a difference. As I said - post up some pics of each end.

How did you test the terminations? Put up some pics of each end of the cable.

I think you need to realise there is a distinct difference between POE and just 'using some spare pairs in an ethernet cable'. It is an common and unfortunate misconception. There is a standard for POE (802.3af, 802.3at) and power and data can coexist on the same pairs. POE is a nominal 48VDC, or higher, supply. POE involves handshaking between the power source and powered device. 10BaseT and 100BaseT are similar in that they both only use two pairs. Gigabit or 1000BaseT uses all four pairs so would prevent you from doing what you are considering. If you do use the spare pairs in 10BaseT or 100BaseT cable, don't plug a POE device in, because what you have isn't POE, it's PUSSPIAEC.

Do you have any firewall / port blocking in your cable modem / router? Do other users with the same cable modem / router have the same issue?

It is reasonably common that NTP servers are configured not to respond to ping requests, so no response to ping is not a good indicator that the NTP server is not responding to NTP requests. Some NTP servers have limits on the polling rates, so manually testing can give a result that the NTP server is not responding, but it is not responding by design.