ZyXEL P-663HN User Guide - Page 103
Quality of Service (QoS), 10.1 QoS Overview, 10.1.1 IEEE 802.1Q Tag
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CHAPTER 10 Quality of Service (QoS) This chapter contains information about configuring QoS, editing classifiers and viewing the ZyXEL Device's QoS packet statistics. 10.1 QoS Overview Quality of Service (QoS) refers to both a network's ability to deliver data with minimum delay, and the networking methods used to control the use of bandwidth. Without QoS, all traffic data is 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 application such as video-ondemand. Configure QoS on the ZyXEL Device to group and prioritize application traffic and fine-tune network performance. Setting up QoS involves these steps: 1 Configure classifiers to sort traffic into different flows. 2 Assign priority and define actions to be performed for a classified traffic flow. The ZyXEL Device assigns each packet a priority and then queues the packet accordingly. Packets assigned a high priority are processed more quickly than those with low priority 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. Note: The ZyXEL Device applies QoS to upstream traffic (going out through the WAN interface). 10.1.1 IEEE 802.1Q Tag The IEEE 802.1Q standard defines an explicit VLAN tag in the MAC header to identify the VLAN membership of a frame across bridges. A VLAN tag includes the P-663HN-51 User's Guide 103