What does an Optical Line Terminal (OLT) include in its configuration?

An Optical Line Terminal (OLT) is a critical component in passive optical networks (PON) and serves as the service provider's endpoint for delivering services to subscribers. In its configuration, the OLT incorporates several key functionalities to manage both the downstream and upstream data flows.

The correct choice outlines that an OLT includes a downstream transmitter, which is responsible for sending data from the OLT to the connected optical network units (ONUs). This data transmission is crucial for delivering services to end users, such as internet and television.

Additionally, the OLT features an upstream receiver, which is tasked with receiving data sent back from the ONUs. This bidirectional pathway is essential for communication reverse from the subscriber back to the service provider.

Coupling these functionalities, the OLT integrates a multiplexer/demultiplexer to manage how multiple signals are combined and transmitted over a single optical fiber and to separate them upon reception. This capability allows efficient use of the optical fibers, supporting numerous users simultaneously while maintaining high data integrity.

This comprehensive configuration ensures that the OLT can effectively manage the flow of data to and from multiple subscribers, facilitating robust service delivery in a modern fiber-optic networking environment.