1，Send Ethernet data to the ONU by a broadcast way;
2, To initiate and control the ranging process, and recording the ranging information;
3,Allocate bandwidth to the ONU;control the ONU start time and the transmission window size of transmission data.
OLT providing business aggregation function, it is also centralized network management platform.It can be achieved in the OLT which refers tube-based equipment management，business-based security management and configuration management.
.Not only can monitor and manage devices and ports, but also can openbusiness
and monitor user status, and it is able to allocate bandwidth according different user's QoS / SLA requirements.Office equipment (OLT) in Genesis Passive Optical Network System, is a multi-service platform to support both IP services and traditional TDM services. Placed in the City Domain network edge or community access networks exports, convergence of access services and are passed to the IP network.