One way to confirm that the port you are connected to on your switch is 1000Mbps (Gigabit) or not is to use a windows based PC with a confirmed 1000Mbps network card installed.
Plug the PC in to the port you wish to confirm the speed and then press 'Ctrl, Alt & Delete'.
Select 'Start Task Manager'.
Once task manager opens, select the 'Networking' tab at the top of the new popped up window.
You will then see a screen similar to below:
If your network port is operating at the correct speed your screen should show 'Link Speed' as 1Gbps
If your port is not 1000Mbps (Gigabit) then the screen will look like the screen shot below.
On the image above, neither the 'Local Area Connection' or 'Wireless Network Connection 2' meet the required speed for your IP HD CCTV system to work at optimum performance.