CTC Union FSW3208M, Руководство пользователя

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2.1.7 Quality of Service
There are 4 class priority can be set for each port: Low, Normal, Medium and High, because there
are 8 priority levels ( 0 ~ 7 ) for each port, so 8 priorities map into 4 class must be done in this QoS
control.
There are 3 QoS Mode can be chosen: Port-based, 802.1P and DSCP. The frames sending not only
per priority setting but also per Queue Mode setting. Strict Mode means highest priority setting
gets first service to send frames, the lower priority frames must wait until all other higher priority
frames are sent (serviced), then it gets service. WRR Mode means different priority are with
different weighting to get service, that is, within a time period, the service times ( chance ) are a
ratio among these 4 classes, user may choose one of preset setting from the manual. A default
diagram with Strict Queue Mode is shown below
Choose the port-based priority level for each port you want to set, then ports will get priority
service as setting, for example, Under Strict Mode, Port 5,6,7,8 are set " low ", port 1,2,3,4
are set as high, medium, normal and low. Then, after " Apply ", usually port 1 will get service at
most of time and even all of the time.