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IP QoS Definition


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IP QoS Definition

QoS, as defined in International Consultative Committee for Telephone and Telegraph (CCITT) Recommendation E.800, may be considered generically as: "The collective effect of service performance which determines the degree of satisfaction of a user of the service."

The successful convergence of voice and data networks into one integrated infrastructure and for this infrastructure to enable advanced multimedia services depends on providing quality of service (QoS). As mentioned earlier, it is a set of mechanisms designed to improve predictability of network service, and is the measure of a network’s ability to match service with user and application requirements.

Within the context of a definable administrative authority (such as the network defined by a service provider’s demarcation points), QoS can be characterized by a small set of measurable parameters:

  • Service Availability

Is the reliability of the user’s connection to the Internet service;

  • Delay

Also known as latency, refers to the interval between transmitting and receiving packets between two reference points;

  • Delay variation

Also called jitter refers to the variation in time duration between all packets in a stream taking the same route;

  • Throughput

Is the rates at which packets are transmitted in a network; this can be expressed as an average or peak rate;

  • Packet loss rate

Is the maximum rate at which packets can be discarded during transfer through a network; packet loss typically results from congestion.






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Last modified: July 13, 2016


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