An optical line terminal, abbreviated as OLT, is a virtual end-point device that can be connected to the front-end (transmission convergence layer) switch with a network cable and can be converted into optical signals. It is also interconnected with the splitter at the user’s end with a single optical fiber to achieve the control, management, and range of the user’s end equipment ONU.
The passive optical network (PON) is composed of an optical line terminal (OLT) at the service’s central hub and optical network units (ONUs) or optical network terminals (ONTs) at the users’ side. OLT plays an essential role in PON in FTTx.
- The OLT is connected to a cable switch at the coverage level and converted to an optical signal.
- The OLT connects to the optical splitter on the customer terminal via optical fiber and coordinates the conversion device on ONTs at the customers’ premises.
- It controls, manages, and measures the distance to customer terminal equipment, e.g., ONUs.
- It is one of the devices to connect to the access network. It can achieve service access through the SNI port.
- The OLT helps control the flow of both upstream and downstream data.