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End-to-End QoS Network Design: Quality of Service for Rich-Media & Cloud Networks, Second Edition by Kenneth Briley Jr., Robert Barton, Christina Hattingh, Tim Szigeti

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Chapter 27. WAN and Branch QoS Design Considerations and Recommendations

QoS has a dual-role in rich-media WAN and branch networks:

Image To manage packet loss (and jitter) by queuing policies

Image To enhance classification granularity by leveraging deep packet inspection engines.

The effect of packet loss on real-time applications has already been discussed at length. However, packet jitter (which is most apparent at the WAN/branch edge because of the dramatic downshifts in link speeds) can result in similar effects on voice and video quality.

Jitter is ...

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