GPON system equipment includes

The main equipment in a GPON system includes the Optical Line Terminal (OLT), Optical Network Terminals/Units (ONTs/ONUs), passive optical splitters, and the Optical Distribution Network (ODN).Optical Line Terminal (OLT)The OLT is the central active device located at the service provider's central office or data center. It aggregates traffic from multiple end users, converts electrical signals into optical signals for downstream transmission, and converts upstream optical signals back into electrical signals for the network. The OLT also manages bandwidth allocation, applies Quality of Service (QoS), and handles encryption for secure communication with ONTs/ONUs. Downstream signals typically use 1490 nm for data and 1550 nm for video, while upstream signals use 1310 nm to avoid interference .Optical Network Terminals/Units (ONTs/ONUs)ONTs or ONUs are installed at the customer premises. They terminate the fiber connection, convert optical signals into electrical signals, and provide interfaces such as Ethernet, WiFi, RJ11, or CATV for end-user devices. Modern ONTs often integrate WiFi routers and support remote management protocols like OMCI or TR-069. They act as the endpoint of the GPON network, enabling high-speed broadband, voice, and video services .Passive Optical SplittersPassive optical splitters are key passive components that divide a single optical signal from the OLT into multiple signals for distribution to multiple ONTs/ONUs. Common split ratios range from 1:16 to 1:128, depending on network design. Splitters introduce optical loss, which must be considered in the GPON power budget, but they require no electrical power, reducing operational costs .Optical Distribution Network (ODN)The ODN consists of the fiber cables, trays, splice boxes, connectors, and passive splitters that physically distribute optical signals from the OLT to the end users. It is entirely passive, meaning it does not require power, and its design affects signal loss and overall network performance. Proper planning of the ODN is critical to ensure reliable service and maintain the GPON loss budget .SummaryIn a GPON system, the OLT serves as the active central hub, ONTs/ONUs act as customer endpoints, passive splitters distribute signals efficiently, and the ODN provides the physical fiber infrastructure. Together, these components enable high-speed, cost-effective, and scalable fiber-to-the-home or fiber-to-the-building deployments, supporting data, voice, and video services over a shared optical network .