User`s manual

NPort S8000 Series Basic Settings and Device Server Configuration
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Serial ToS Settings
Using Serial Traffic Prioritization
The NPort S8000’s traffic prioritization capability provides Quality of Service (QoS) to your network by making
data delivery more reliable. You can prioritize traffic from both serial interface and Ethernet interface on your
network to ensure that high priority data is transmitted with minimum delay.
Traffic can be controlled by a set of rules to obtain the required Quality of Service for your network. The rules
define different types of traffic and specify how each type should be treated as it passes through the NPort
S8000. The NPort S8000 can inspect layer 3 TOS information to each serial port to provide consistent
classification of the entire network. The NPort S8000’s QoS capability improves the performance and
determinism of industrial networks for mission critical applications.
The Serial Traffic Prioritization Concept
What is Traffic Prioritization?
Traffic prioritization allows you to prioritize data so that time-sensitive and system-critical data can be
transferred smoothly and with minimal delay over a network. The benefits of using traffic prioritization are:
• Improve network performance by controlling a wide variety of traffic and managing congestion.
• Assign priorities to different categories of traffic. For example, set higher priorities for time-critical or
business-critical applications.
• Provide predictable throughput for multimedia applications, such as video conferencing or voice over IP,
and minimize traffic delay and jitter.
• Improve network performance as the amount of traffic grows. This will save cost by reducing the need to
keep adding bandwidth to the network.
DiffServ Code Point (DSCP)
Differentiated Services (DiffServ) Traffic Marking
DiffServ is a Layer 3 marking scheme that uses the DiffServ Code Point (DSCP) field in the IP header to store
the packet priority information. DSCP is an advanced intelligent method of traffic marking as you can choose
how your network prioritizes different types of traffic. DSCP uses 64 values that map to user-defined service