Edgar Allen Poe was a 19th century writer generally known for his macabre short stories – just kidding, that’s obviously not the right Poe. The PoE we’re concerned with is an acronym for “Power over Ethernet” and refers to a system that passes electrical power along with data on an Ethernet cable. As we mentioned, this bundles power and data together and removes the necessity of a separate power source, which just adds more cables. A POE switch also allows you to rig more cameras together to the same NVR. These switches can provide several ports for connecting cameras, and then those PoEs in turn can be connected to a single NVR in a “tree” style configuration, provided your switch is able to handle the power and network traffic. A similar amount of cameras would require additional DVRs in an analog set-up, and that means more cables, and more work.