User`s guide

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Class-of-Service (CoS) Support
The AT-8126XS switch provides two transmit queues on each port, with
a weighted round-robin scheme. This function can be used to provide
independent priorities for various types of data such as real-time video
or voice, and best-effort data.
Priority assignment to a packet in the AT-8126XS switch is accomplished
through explicit assignment by end stations which have applications
that require a higher priority than best-effort. This switch utilizes the IEEE
802.lp and 802.lQ tag structure to decide priority assignments for the
received packets.