PoE surveillance systems may offer a simplified approach for networking security cameras due to the ability of Ethernet cables to deliver both connectivity and power to devices. Prior to purchasing a CCTV system, one must first determine the number of cameras that are needed along with the coverage areas. In addition, it is advisable to verify the PoE power budget of the switch or recorder to ensure compatibility and adequate power supply to all the connected devices. Another important factor is the storage capacity in case of recording.