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The Optical Access Network consists of three components: the Optical Line Terminal (OLT), the Optical Network Unit (ONU), and the Optical Distribution Network (ODN). OLT is a core component in the optical access network system architecture, equivalent to the aggregation switch in traditional communications networks. It also serves as a multi-service management platform. Typically deployed in core or node equipment rooms, the OLT aggregates service data from the optical access network and distributes it to different IP networks. ODN consisting of single-mode optical fiber, fiber optic distribution frames (DFs), optical connectors, splitters, and other passive components, provides the optical transmission medium for the physical connection between the OLT and ONUs. It features long transmission distances (capable of 20-40 kilometers), is passive, easy to install and deploy, supports multi-level and unequal splitting, and offers flexible expansion. ONU refers to the optical network equipment connected to the ODN branch fiber. It is an integrated optical and electrical device, typically deployed on the user side, connected to the upper-layer OLT equipment through the ODN and centrally managed by the OLT. To meet the needs of various scenarios, ONU devices also have various forms.
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