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TL-PA4030 AV500 3-port Mini Powerline Adapter
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4.3 Advanced
The third tab window labeled “Advanced” is for Quality of Service. With the proper configuration,
the limit bandwidth can be took full advantage. QoS requirements are different for various data
types such as streaming video or music, voice and raw data. To provide higher QoS for streaming
data, priority levels can be set using tags at the beginning of data frames. Virtual Local Area
Network (Vlan) 802.1p priority tags on Ethernet frames are used to specify 8 (0~7) levels of “user
priority”. Homeplug AV powerline allows for 4 levels of Channel Access Priority CAP 0-3)).
Therefore, the 8 levels of VLAN Ethernet tags must be mapped to the 4 levels of CAP priority,
where CAP 3 is the highest priority and CAP 0 is the lowest. CAP 3 priority might be used for voice
and network management frames, CAP 2 is used for streaming video while CAP 1 and CAP 0 are
used for data. Mapping VLAN tags to CAP levels is easily done using the VLAN Priority Mapping
function on the QoS tab window.