Hitachi's AMN1220 High-performance GPON solution supports multiple residential and commercial Fiber-To-The-Premises applications. The AMN1220 is a standards-compliant GPON system designed around Hitachi's own internally-developed ASICS and GPON optics. The AMN1220 is compliant with ITU-T G.984 standards, including GEM (GPON Encapsulation Mode). GEM allows native transport of TDM circuits (DS1) and Ethernet transport of data.