User Manual
Product information and planning
9500 MPR Rel. 3.1
3DB18809AAAA Issue 1196/980
Scheduler
The scheduler algorithm cannot be configured. HQP scheduler algorithm is used on queues Q8, Q7 and
Q6.
Deficit Weighted Round Robin (DWRR) is used on the other queues with the following weights:
QoS with jumbo frame
While there is no physical limitation to the number of ports that can receive jumbo frame, if more jumbo
flows are transmitted toward the same port into two different queues the QoS could work in wrong way.
It is recommended to forward jumbo frame only in the queue Q1 (lower priority).
2.8.20.2 QoS in the Modem unit
Figure 100. QoS in the Modem unit
In the figure is shown an overview of the QoS implementation inside the Modem unit which is used to
interface the ODU300.
The QoS feature provides eight internal queues to support different traffic priorities. The QoS function can
assign the packet to one of the eight egress transmit queues.
– Queue 8 is assigned to TDM2TDM traffic
– Queue 7 is assigned to TDM2Eth traffic
– Queue 6 is assigned to TMN
QUEUE WEIGHT
Q5 (higher priority) 16
Q4 8
Q3 4
Q2 2
Q1 1
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