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Implementing Cisco Networking Solutions by Harpreet Singh

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Jitter

Jitter is probably the most important concept that is related to voice and video over IP, and the most confusing as well.

Let's consider a source that is sending packets at a constant rate. The packets experience delays on the network as has been discussed in the previous section. Some of the delays are constant delays, but some of the delays experienced by the packets are variable and depend upon the traffic load and the network state at a given point in time. If all delays were constant, the received packets would be equally spaced. Due to the variable delays, the packets are received with nonuniform gaps between consecutive packets. Jitter is shown pictorially in the following figure as a comparison of the received packets to the ...

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