ZyXEL P-792H v2 User Guide - Page 201
Quality of Service QoS
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CHAPTER 15 Quality of Service (QoS) 15.1 Overview Use the QoS screens to set up your P-792H v2 to use QoS for traffic management. Quality of Service (QoS) refers to both a network's ability to deliver data with minimum delay, and the networking methods used to control bandwidth. QoS allows the P-792H v2 to group and prioritize application traffic and fine-tune network performance. Without QoS, all traffic data are equally likely to be dropped when the network is congested. This can cause a reduction in network performance and make the network inadequate for time-critical applications such as video-on-demand. The P-792H v2 assigns each packet a priority and then queues the packet accordingly. Packets assigned with a high priority are processed more quickly than those with low priorities if there is congestion, allowing time-sensitive applications to flow more smoothly. Time-sensitive applications include both those that require a low level of latency (delay) and a low level of jitter (variations in delay) such as Voice over IP (VoIP) or Internet gaming, and those for which jitter alone is a problem such as Internet radio or streaming video. 15.2 QoS Overview The following figure gives an overview of how to configure QoS on this P-792H v2: 1 3 PVC1, ATM QoS 1 2 Queue 1 PVC2, ATM QoS 2 Queue 2 P-792H v2 User's Guide 201