In summary, PoE and PoE+ use a single Ethernet cable to carry both data and power. Ethernet cable is readily available and does not require an electrician to install. This allows inexpensive installation, as well as easy maintenance and serviceability. Relocation of equipment also becomes easier since a wall socket is not required to power the device. Linear Technology has been actively involved in helping define the PoE standards and has developed several generations of PoE controllers. These controllers are widely adopted in the networking industry and offer many integrated features that simplify circuit design and increase functionality.