Although ONUs, routers, and switches are used for the Internet, they differ in some aspects. Below, we've listed a comparison chart to help you clarify the differences between these three devices: Practic.
OMCI (ONU Management and Control Interface) is a standardized protocol defined by the ITU-TG. 4 recommendation, enabling remote management of Optical Network Units (ONUs) by the Optical Line Terminal (OLT) in a GPON network. It serves as the interface between the network infrastructure and the customer's devices, such as computers, phones, and smart TVs. There is only one instance, number 0.