HG921-W(HGU) is a GPON ONT terminal device ,which designed for fulfilling FTTx and triple play service demand of fixed network operator . This box is based on the stable and mature Gigabit GPON technology, which has high ratio of performance to price, and the  technology of Layer 2/3,WDM and high quality VoIP as well. It is highly reliable and easy to maintain, with guaranteed QoS for different service.  It is fully compliant with technical regulations such as ITU-T G.984.x and technical requirement of GPON Equipment.