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Chapter 5
Expert Configuration
E-DOC-CTC-20050429-0104 v1.0
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5.3.7 IP QoS
Definition Quality of Service is the ability for an application to obtain the network service it
requires for successful operation. Nowadays the total amount of data traffic
increases, while new types of data emerge, like: voice data, video data, audio data.
These new types of data pose new requirements for data transport, e.g. low latency,
low data loss… To meet these requirements, the entire network must ensure them
via a connection service guarantee. Such a connection service guarantee can both be
applied to connection oriented networks (connection based) and to packet-oriented
networks (data-stream or data type based).
Quality of Service allows specifying a connection service guarantee via a set of
connection parameters. Throughout the network, this set of connection parameters
will be used to handle the connection data in a way to achieve the connection
service guarantee. This handling includes reserving bandwidth, priority based
queuing, scheduling, modifying data characteristics, …
Examples of connection parameters include the maximum amount of bandwidth that
may be used, the guaranteed amount of bandwidth that will always be available, the
maximum delay the data can experience throughout the network, a priority
indication,…