American Fibertek SM9p - Manual (Page 103)

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QoS Configuration interface
QoS Policy and Priority Type
 Select the Oos Policy: select the Qos policy rule.
 Using the 8,4,2,1 wnine fair queue scheme: the switch will follow 8:4:2:1 rate
to process priority queue from Hi to lowest queue. For example: the system will
process 8 high queue packets, 4 middle queue packets, 2 low queue packets,
and the one lowest queue packets at the same time.
 Use the strict priority scheme: Always higher queue will be process first,
except higher queue is empty.
 Select the Priority Type: every port has 5 priority type selections. Disable means no
priority type is selected.
 Port-base: the port priority will follow the default port priority that you have
assigned – High, middle, low, or lowest.
 COS only: the port priority will only follow the COS priority that you have