Quality of service - Wikipedia

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** Quality of service **

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*Quality of service* (*QoS*) is the overall performance of a telephony or
computer network, particularly the performance seen by the users of the
network. To quantitatively measure quality of service, several related
aspects of the network service are often considered, such as error rates,
bit rate, throughput, transmission delay, availability, jitter, etc.

In the field of computer networking and other packet-switched
telecommunication networks, quality of service refers to traffic
prioritization and resource reservation control mechanisms rather than the
achieved service quality. Quality of service is the ability to provide
different priority to different applications, users, or data flows, or to
guarantee a certain level of performance to a data flow.

Quality of service is particularly important for the transport of traffic
with special requirements. In particular, developers have introduced
technology to allow computer networks to become as useful as telephone
networks for audio conversations, as well as supporting new applications
with even stricter service demands.


· 1 Definitions
· 2 History
· 3 Qualities of traffic
· 4 Applications
· 5 Mechanisms

· 5.1 Over-provisioning
· 5.2 IP and Ethernet efforts
· 5.3 Protocols

· 6 End-to-end quality of service
· 7 Circumvention
· 8 Doubts about quality of service over IP
· 9 Mobile (cellular) QoS
· 10 Standards
· 11 Open source software
· 12 See also
· 13 References
· 14 Further reading
· 15 External links


In the field of telephony, quality of service was defined by the ITU in
1994.^[1] Quality of service comprises requirements on all the aspects of a
connection, such as service response time, loss, signal-to-noise ratio,
crosstalk, echo, interrupts, frequency response

Source: en.wikipedia.org/wiki/Quality_of_service

how is qos maintained in a telephone network

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