Technical Description
• Reuse priority bits in customer Q-tag
• Default value (based on port number)
All LAN/WAN Ethernet ports can be configured with 1-8 traffic classes, where
8 traffic classes are default.
The CoS priority information is used to map the Ethernet frames into the 1-8
traffic classes. The mapping can be done according to either IEEE802.1D-2004,
IEEE802.1Q-2005 or custom. Frames with no CoS information is mapped to
the default traffic class.
The Ethernet frames in the egress queues are scheduled according to a strict
priority scheme, i.e. frames with highest priority are scheduled first.
3.7.3 Performance Management
The following performance counters for Ethernet traffic are available:
• Number of discarded packets, for example due to overflow or CRC-32
errors
• Number of sent/received frames
• Number of sent/received octets
3.7.4 Ethernet Interface Unit (ETU)
The ETU3 provides two 10/100/1000BASE-T interfaces and two 1000BASE-TX
SFP Interfaces. The SFPs can be either electrical (SFPe) or optical (SFPo),
see Section 6.3 on page 130. The ETU3 can be fitted in an AMM 2p B or AMM
6p C/D together with NPU3 B. ETU3 has six inverse multiplexers. For ETU3,
each Ethernet Interface and each inverse multiplexer is connected to different
ports on the Ethernet switch on the NPU3B.
The ETU2 provides five 10/100BASE-T interfaces and one 10/100/1000BASE-T
interface. It can be fitted in any subrack. ETU2 has six inverse multiplexers.
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