GP-L200N User Manual
69
8 About PowerLine QoS
The GP-L200N 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).
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
4 CAP2
4 CAP2
5 CAP2
5 CAP2
6 CAP3
6 CAP3
7 CAP3
7 CAP3
