Digital IP systems utilize power-over-ethernet (PoE) technology for an easy and flexible installation process. With PoE technology, each camera only needs a single ethernet cable run to connect it to the NVR. This ethernet cable provides both power and video transmission up to 300ft / 91m. A PoE switch will allow you to extend the distance of your cameras from the NVR. It also opens up the space to accommodate additional IP cameras and helps minimize the amount of cabling needed for larger installations.