A:Answer Good Afternoon, the cameras connect to the DVR via BNC cables, which are included with the system. If you would like to use Cat5 ethernet cables to connect the cameras to the DVR, you will need to use a Night Owl Video Balum to connect the cameras to the Ethernet cable and make the connection to the DVR. Also, you may use the Cat5 ethernet to connect the system to the internet. Thank you for choosing Night Owl.