If you are setting up a wired network for the first time you will first need to install Ethernet cabling. For most purposes, use twisted-pair Cat-5 Ethernet cables, which are inexpensive and widely available.
Gigabit Ethernet is recommended, especially if you are using many network cameras, or high-resolution network cameras.
Power Over Ethernet eliminates the need for power connections at each camera location. In order to use this technology your network cameras and Ethernet switch must be compatible with the 802.3af Power Over Ethernet standard.