GE T1000, Technical Manual

Page: 95 / 302

GE Reason Switches Chapter 4
– Functions
REASON SWITCHES-TM-EN-3 95
The table above, taken from IEC 61850-90-4, shows that 4 classes of services should
be considered when using QoS services: The Gold class for SCADA and Automation
messages, the Silver class for management messages, the Bronze class for other
kinds of data and the Best Effort class (DSCP value 0) for legacy equipment with no
DSCP priority information.
Figure 57: List of DSCP code point field values, shown in section D.2.9 of the IEC 61850-90-4 Technical Report
Figure 58: Example of DSCP to CoS mapping, shown in section D.2.9 of the IEC61850-90-4 Technical Report
If the application does not have a special reference to be used, the table below can
be used as reference for DSCP-to-CoS mapping. reference:
CoS bits value DSCP bits value
0 0
1 8 – 14
2 16 – 22
3 24 – 30
4 32 – 38