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.