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QoS is a fundamental network infrastructure technology—in the same class as high availability and security technologies. As the network traffic is evolving and video traffic is growing fast, the QoS plays an important role in model network.

Not only bandwidth, several basic characteristics define a traffic class and thereby dictate the network’s handling of packets belonging to that traffic class. Crucial among these characteristics are the following:

  • Delay (or latency): This is the finite amount of time that it takes a packet to reach the receiving endpoint after being sent from the sending endpoint.
  • Jitter (or delay variation): This is the variation, or difference, in the end-to-end delay in arrival between sequential packets.
  • Packet drops: This is a comparative measure of the number of packets faithfully sent and received to the total number sent, expressed as a percentage.