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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, 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. Settings are available for Unicast (directed to a host).
y IGMP - (default CAP 3) - sets the channel access priority for IGMP frames -
these are the group management frames, not the stream data
y Unicast - (default CAP 1) - sets the default channel access priority for
unicast frames not matching any other classification or mapping.
y IGMP managed Multicast Stream (Fixed to CAP 2) - sets the default channel
access priority for stream data belonging to a snooped IGMP multicast
group.
y 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:
VLAN Tag
User riority
Default CAP Priority TOS Bit User
Priority
Default CAP Priority
0
CAP1
0
CAP1
1
CAP0
1
CAP0
2
CAP0
2
CAP0
3
CAP1
3
CAP1
4
CAP2
4
CAP2
5
CAP2
5
CAP2
6
CAP3
6
CAP3
7
CAP3
7
CAP3
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