Most NVRs have RJ45 female connectors on the back. You need to connect UTP cable’s RJ45 male connector to NVR’s RJ45 female connector directly. Also, you connect the cable correctly according to the WAN or LAN. For WAN, you should connect the UTP cable to the public area network port. While for LAN, you should connect the UTP cable to the local or private area network port. Mostly, CAT-5 UTP cable is used for connecting IP cameras, and CAT-5e or more higher level UTP cable is used for connecting network switching hub.