Appendix C; About Qos - npg 200M LAN Manual Del Usuario

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.
Defaul t 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).
I IGMP - (default CAP 3) - sets the channel access priority for IGMP frames - these
are the group management frames, not the stream data
I Unicast - (default CAP 1) - sets the default channel access priority for unicast frames
not matching any other classification or mapping.
I IGMP managed Multicast Stream (Fixed to CAP 2) - sets the default channel access
priority for stream data belonging to a snooped IGMP multicast group.
I 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
0
1
2
3
4
5
6
7
Default CAP Priority
CAP 1
CAP 0
CAP 0
CAP 1
CAP 2
CAP 2
CAP 3
CAP 3
TOS Bit User
Priority
0
1
2
3
4
5
6
7
18
Default CAP Priority
CAP 1
CAP 0
CAP 0
CAP 1
CAP 2
CAP 2
CAP 3
CAP 3