Ethernet Passive Optical Network (EPON or GePON) is a leading point to multi-points technology widedly used in FTTx deploymnets. EPON consists of an optical line terminal (OLT) at central office node, one or more optical network units (ONU) or optical network terminals (ONT) at user nodes , and the optical distribution network (ODN) between them. SH EPON ONU SFP Optical Transceivers provide 1.25Gbps upstream at 1310nm wavelength and 1.25Gbps downstream at 1490nm wavelength up to 20km over a single mode fiber.