QoS Traffic Requirements Videoconferencing

• Minimum priority bandwidth guarantee required is:

- For example, a 384-kbps stream would require 460 kbps of bandwidth

*One-way requirements

Videoconferencing has the same latency, jitter, and packet-loss requirements as voice, but the traffic patterns of videoconferencing are radically different from voice. For example, videoconferencing traffic has varying packet sizes and extremely variable packet rates. Because of its bursty nature, videoconferencing has these two unique best-practice requirements in provisioning for strict-priority bandwidth:

■ The LLQ should be provisioned to the stream rate plus 20 percent.

■ The LLQ burst parameter should be provisioned to 30 KB per 384-kbps stream.

Compared to videoconferencing, streaming video applications have more lenient QoS requirements. Video streaming applications are more delay insensitive and are largely jitter insensitive due to application buffering. When provisioning for streaming video applications, take into account the video content distribution requirements. Video file distribution is similar to FTP traffic in nature and can have a major impact on network performance because of the large file size. Content distribution traffic should be managed to avoid impacting the network.

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