Abstract: High Frequency Reference Design (HFRD) 22 is a series of modular GPON (MOGPON) evaluation boards allowing simple evaluation of various configurations and options. They provide a complete reference design to speed and simplify new product development for the entire physical layer design of an ONT/ONU. Using the provided schematics, bill of materials, layout files, typical test data and populated boards, a designer can quickly evaluate and test the components of the design at a system level of operation. User software is also provided that allows configuration, control and monitoring of each HFRD 22 reference design through a windows controlled USB interface. Gerber files and schematics may be provided, however reference design boards are no longer available.