PLV-500AV-PE_User Manual
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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:
VLAN Tag User
Priority
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