Content

| 8.1 |  | Quality of Service Requirements |
| 8.1.9 |  | Quality of Service requirements for video |

Streaming video applications have more lenient QoS requirements, as they are delay insensitive. A video can take several seconds to cue-up and is largely delay variation insensitive due to application buffering. Streaming video may contain valuable content, as in the case of an e-learning application, and may require service guarantees using QoS. Streaming video would be appropriately provisioned in the “Silver” class of data traffic. When provisioning for streaming video, take into account the video content distribution requirements.

Video file distribution is very similar to FTP traffic and can have a major impact on network performance due to the file size. Distribution traffic should be managed to avoid impacting the network. For example, video content transfers could be limited to off-peak hours or treated as “less-than-best-effort” traffic.

When addressing the QoS needs of video conferencing traffic the basic requirements are similar to those for voice. Loss should be no more than 1 percent, one-way latency should be no more than 150-200 ms and the average jitter should be no more than 30 ms. Due to its bursty nature, the minimum bandwidth guarantee is the size of the video conferencing session plus 20 percent. This means that a 384 Kbps video conferencing session requires 460 Kbps guaranteed priority bandwidth.