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Quality of Service (QoS) is what determines if a wireless technology can successfully deliver high value services such as voice and video. The chief detractors from good QoS are latency, jitter and packet loss. Solve these issue and you have a carrier-grade service. Very simply put, WiMAX offers a very low latency across the wireless span. Most ven-dors have products where latency is less than 10 milliseconds from base station to CPE (and vice versa). To put this in perspective, latency must be measured end-to-end. VoIP, for example, is highly susceptible to latency. If latency exceeds 150 milliseconds for ex-ample, the quality of the conversation begins to drag. At or above 200 milliseconds many listeners may find a conversation unintelligible.

In the case of WiMAX, the large majority of latency will not occur on the air link be-tween subscriber and base station but rather on the wired portion of the connection be-tween the subscriber and what ever the "other end" might be (web site server, IPTV server or VoIP called party). The figure below illustrates how any latency on the wireless portion of a network is minimal relative to that on the wired portion of a network.

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