Channel Properties - QoS Queue
Original instructions
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Description
The BMX NOC 0401 Ethernet communication module can be configured to sort packets it receives by placing them into one of 4 separate queues—based upon their priority (very high, high, low, very low)—and handle each packet in the order of its priority.
The module also can be configured to add a differentiated service code point (DSCP) value to each packet it originates, indicating the relative priority of the packet.
The process of packet queuing and DSCP tagging together enable the module to perform Ethernet packet traffic management.
Use the QoS Queue tab of the Channel Properties → Switch page to assign differentiated service code point (DSCP) values and queueing priorities to Ethernet packets based on their message type.
NOTE:
  • The settings input in this page are synchronized with the values input in the Services → QoS page. Edits to a common property in either page will change that value in the other page.
  • The Explicit Message group settings are editable only when Control Expert is operating in Advanced Mode.
  • Confirm that every switch in your network adopts the same DSCP tagging scheme, thereby providing consistent packet traffic management throughout your network.
The QoS Queue page, displaying the default settings, looks like this:
To display this page, select the Channel Properties → Switch node in the navigation tree located on the left side of the Device Editor, then click on the QoS Queue tab.
NOTE: Refer to the topic Configuring Properties in the Device Editor for instructions on how to edit properties.
QoS Queue Mapping Settings
DSCP settings have a range of 0...63. The range of Queue Mapping settings are set forth below:
Group
Traffic Type
Available Group Queue Settings
Precision Time Control
Point-to-point event
  • Very High
  • High
Point-to-point general
  • High
  • Low
  • Very Low
IEtherNet IP Control1
Urgent
  • High
  • Low
  • Very Low
Scheduled
High
Low
Explicit2
Modbus TCP Control1
Modbus I/O
  • High
  • Low
  • Very Low
Modbus Explicit
Network Time Protocol
NTP Control
  • Very High
  • High
  • Low
  • Very Low
1. Edits to these properties are synchronized with the Services → QoS page.
2. Editable only in Advanced Mode.