HG623-TW is designed as HGU (Home Gateway Unit) in different FTTH solutions; the carrier-class FTTH application provides data service access. It is based on mature and stable, cost-effective XPON technology. It can switch automatically with EPON and GPON mode when it access to the EPON OLT or GPON OLT. It adopts high reliability, easy management, configuration flexibility and good quality of service (QoS) guarantees to meet the technical performance of the module of China Telecom EPON CTC3.0. It is compliant with IEEE802.11n STD, adopts with 2×2 MIMO, the highest rate up to 300Mbps. It is fully compliant with technical regulations such as ITU-T G.984.x and IEEE802.3ah.It is designed by Realtek chipset 9602C.