
Hi Marcel
Just to help.
The ATEM switchers only receive SDI or HDMI signals, depending the model.
Yours is HDMI, so you must connect the cameras using HDMI cables.
Now, the network connection from each camera to a network switcher or router (depending on your setup) is for controlling the cameras using a PTZ controller (hardware) or an app, and receiving an NDI signal using the network connection at the same time.
NOTE: You can control: Pan, Tilt, Zoom, Presets using
Ex. NDI Tools (mac / PC
https://ndi.video/tools/
I don't know details about your project setup is; you may need ATEM, or if you're using Ex:VMix workstation (preferably with a dual network card), you can use the NDI signals (video) directly in VMIX computer.
Again, depending on your setup, let says: if you are using a streaming system like Vmix or OBS, you can use both: HDMI video signals and NDI signals at the same time as "redundancy" Ex E\in case the Atem fails)
Sorry if this is confusing.