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IP Telephony: Packet-based Multimedia Communications Systems by Jean-Pierre Petit, David Gurle, Olivier Hersent

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Chapter 6. Quality of service

What is QoS?

Quality of service (QoS) was largely ignored in the initial design of IP. IP, like other packet network technologies, was built and optimized to transport data, not voice or video. The only ‘quality of service’ that was required was that the data should not be corrupted or get lost. Today, the improvement of networking technology makes it feasible to transport real-time data over an IP network. Therefore it becomes extremely important to be able to characterize and control jitter and transit delays in the network. Jitter is important mainly in real-time applications which need to maintain worst-case buffers to allow for timely delivery of the packets.

Packet loss is also an important parameter of the packet ...

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