The ADTRAN 8001B is an EPON Optical Network Unit designed for Single Family Unit (SFU) use in home and small office environment. It provides subscriber with rich, individualized, and comfortable triple-play services including video (IPTV), voice and high speed internet access. It has a small form factor and green, energy-saving advantage. It supports 1(one) Gigabit Ethernet (UTP, RJ45) port to subscriber. It is connected to GEPON OLT and RN (Remote Node) via a fiber optic cable to provide TPS (Triple Play Service), while supporting DPoE. By adopting the state-of-the-art E-PON technology, 8001B supports various features including Quality of Service (QoS) function, management function enabling prompt reactions against the problems in the system or a subscriber line, security function protecting subscriber information safe, and subscriber management function sheltering user information from illegal users.