Allied Telesis AT-S81 - Manual (Page 304)

Appendix A: AT-S81 Default Settings
304 Section I: Basic Features
Quality of Service
The following table lists the default mappings of IEEE 802.1p priority
levels to egress port priority queues
IEEE 802.1p Priority Level Port Priority Queue
0 or 1 Q0 (lowest)
2 or 3 Q1
4 or 5 Q2
6 or 7 Q3 (highest)