HG921-TW(HGU) is a GPON ONT terminal device ,which designed for fulfilling FTTx and triple play service demand of fixed network operator . This box isbased on the stable and mature Gigabit GPON technology, which has high ratio of performance to price, and the technology of Layer 2/3,CATVand 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.