13-5
Figure 13-1 QoS model for uplink traffic in an EPON system
QoS Functions for Downlink Traffic
Processing on an OLT
z Configuring the OLT to perform priority mapping for packets received from the uplink port
according to the CoS-to-local precedence mapping table and then assign packets to output
queues of the OLT port.
z Configuring the OLT to perform congestion management for downlink traffic, supporting SP and
WRR queue scheduling algorithms.
z Configuring the OLT to perform line rate and traffic shaping for downlink traffic.
z Configuring the maximum downlink bandwidth that the OLT assigns to the ONU.
z Configuring high-priority packet buffer for downlink traffic that the OLT sends to the specified
ONU.
Processing on an ONU
z Filtering the packets matching certain match criteria according to the configured QoS policy.
z Configuring the ONU to distribute the received downlink traffic to different output queues based on
the mapping between the CoS precedence and local precedence.
z Configuring the ONU to perform traffic policing for downlink traffic of a UNI.
Some ONUs support configuring queue scheduling for traffic from a UNI. To perform such
configurations, you should log in to the ONU. For detailed configuration, see the ONU user manual.
Figure 13-2 shows the QoS model for downlink traffic in an EPON system.
Figure 13-2 QoS model for downlink traffic in an EPON system
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