Patch Panels
Cameras that connect using BNC are using an analog signal (NTSC or PAL) or possibly SDI for HD (I have never seen any of these) and plug into either a video capture card or a dedicated DVR. Network security cameras use normal IP protocols, and can either be configured to push their video to the server, or more commonly the server pulls the video from the cameras it is configured to monitor. My employer offers a security camera installation and management product, we build our own servers and mostly use IP cameras from AXIS or ACTi. For any analog cameras we have to support, we use an encoder like the AXIS 240Q that from the server perspective looks like a normal AXIS camera except with 4 video streams available instead of one.
Wires from the camera or ethernet walljack locations get wired into the back of the patch panel. You use patch cables to connect individual ports on the front to wherever on the switch they should be connected. Other devices on the rack normally aren't connected to the patch panel, so if you have a server connected to the switch you just use patch cables directly.

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