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APPENDIX C: ABOUT QOS
PLC 200AV allows for 4 levels of Channel Access Priority (CAP (0 – 3)). 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, and CAP 2 is used for streaming video and music while CAP
1 and CAP 0 are used for data.
Default CAP
The ‘Default CAP’ group allows for default priority mapping of packets that do not have a VLAN TAG. The settings are
available for Unicast (directed to a host).
IGMP - (default CAP 3) - sets the channel access priority for IGMP frames - these are the group management
frames, not the stream data.
Unicast - (default CAP 1) - sets the default channel access priority for unicast frames not matching any other
classification or mapping.
IGMP managed Multicast Stream (Fixed to CAP 2) - sets the default channel access priority for stream data
belonging to a snooped IGMP multicast group.
Multicast/Broadcast - sets the default CAP for multicast frames not in a snooped group and for broadcast
frames.
The following are the factory default settings for VLAN Tags and TOS Bits:
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