DiffServ service classes for network QoS

Service Quality


The prioritization procedures presented here ensure improvements in the transmission of data streams (Figure 4). However, some of the proposed potential solutions differ fundamentally or require the combination of individual partial solutions. No single solution offers a panacea for every network problem.

Figure 4: Classification of incoming packets on the basis of class-based queuing ensures individual control or prioritization of the data streams.

For this reason, when designing the network, first you need to make sure that the network bandwidth is available as a mandatory requirement. QoS is not a panacea for insufficient transmission capacity on the network. Adequate bandwidth helps reduce delays and packet loss. Second, you need to counteract connection saturation or overload in the transmission path with the appropriate queuing procedures, which ensures that high-priority traffic flows are transmitted, even if transport resources are overloaded.

Ultimately, you can only achieve quality through quality assurance (i.e., by using suitable metrics). Admins often check passive lines but wrongly assume that active components can be ignored. However, experience shows that big differences can exist between what the data sheet claims and the actual network component.


  1. ITU Y series recommendations: https://www.itu.int/rec/T-REC-Y/en

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