A PoE injector is a device that adds power to an Ethernet cable for Power over Ethernet (PoE) equipment. It can be used to connect a PoE-enabled network device to a non-PoE LAN switch port. A PoE injector can be implemented to make a non-PoE compatible switch work with PoE devices by powering compliant devices over a single Ethernet cable. It is also called a midspan or PoE adapter. PoE injectors are based upon the rules defined by the IEEE 802.3 working group, and no special cabling is required. They are very safe and wont damage any equipment, even if the equipment is not designed for PoE applications. Before the PoE injector sends any power to the connected powered device (PD), such as the VoIP phone, the injector initiates a handshake procedure that utilizes low voltage and is harmless to any connected device, PoE or non-PoE. PoE injectors offer several benefits, including reducing cabling and fewer points of failure. There are two types of PoE injectors: active and passive. Active PoE injectors are more expensive and can provide power to devices up to 100 meters away, while passive PoE injectors are cheaper and can provide power to devices up to 30 meters away. PoE injectors usually have two RJ45 ports, one labeled Data In and one labeled PoE/Data Out. The Data In port is connected to a non-PoE switch, while the PoE/Data Out port is connected to a PoE device.