American Fibertek SM9p - Manual (Page 104)

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assigned.
 TOS only: the port priority will only follow the TOS priority that you have
assigned.
 COS first: the port priority will follow the COS priority first, and then other priority
rule.
 TOS first: the port priority will follow the TOS priority first, and the other priority
rule.
 Save the configuration.
QoS Policy and Priority Type interface
Default Port Priority
Configure per port priority level.
 Port 1 ~ 10: each port has 4 priority levels – High, Middle, Low, and Lowest.