The 140 NOP 850 00 module provides fixed priority packet tagging for Ethernet transmissions. No configuration is required for this service.
The module supports the OSI layer 3 Quality of Service (QoS) standard defined in RFC-2475. The module adds a differentiated services code point (DSCP) tag to each Ethernet packet it transmits, indicating the priority of that packet.
QoS automatically prioritizes Ethernet packet streams based on the type of traffic in that stream. The 140 NOP 850 00 module recognizes the traffic types described below:
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Traffic type
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Prioritization value (default)
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DSCP Value for Network Time Protocol Messages
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59
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DSCP Value for IEC 61850 Messages
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43
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DSCP Value for Explicit Messages
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27
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To implement QoS settings in your Ethernet network:
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Use network switches that support QoS.
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Consistently apply DSCP values to network devices and switches that support DSCP.
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Confirm that switches apply a consistent set of rules for sorting DSCP tags, when transmitting and receiving Ethernet packets.
