The ONU (Optical Network Unit) and ONT (Optical Network Terminal) are located at the user's end of the network. This article provides a deep-dive analysis of ONU technology, including its history, role in PON ecosystems, working principles, components, standards. The Optical Line Terminal (OLT) is the central component of the PON system, typically housed at the service provider's central office. It functions like a router or switch in a traditional network but tailored for fiber optics. The purpose of this device is to use optical fiber to connect to the passive optical network (PON) and communicate with your Internet service provider to get an Internet connection. In a PON system, a single fiber typically connects the OLT device to the ONU to achieve Fiber to the x.
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