The document is an instruction manual for the American Fibertek Series 46 PoE Ethernet Fiber Optic Transceivers, detailing setup, installation, and operation instructions. It describes the transceiver's capabilities, including its function as a 3-port Ethernet switch/media converter that offers Power over Ethernet (PoE) to connected devices. Additionally, it includes warranty information, service contacts, and specifications for installation conforming to local codes.