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With the increasing demand for advanced voice and video services, the traditional best-effort delivery model is no longer adequate to attract and retain premium service customers, who are essential to profitable carrier services. As network traffic increases, events such as congestion and data priority become an issue and can seriously affect traffic flows and delivery. Service providers must guarantee a predetermined level of service, regardless of traffic levels. To do so, a set of mechanisms known as quality of service (QoS) is used to prioritize and guarantee performance to support customer service-level agreements (SLAs). The objective of the application note is to introduce various concepts related to Qos and the testing needs for such mechanisms.
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