Power over Ethernet (PoE) sends both power and data down a single network cable, so a camera or a door reader needs just one cable run instead of separate power and data cabling to the same spot.Beyond the obvious material savings, this cuts labour significantly — no need to find or run a separate power source near every camera position, which is often the hardest part of a coverage plan on an older building. It also makes it far easier to place a camera or access point wherever it’s actually needed, rather than wherever a power outlet happens to already be.Most modern CCTV and access control installs default to PoE for exactly this reason — it’s simpler to install and easier to maintain long-term.