The SLA parameter value-range varies accordingly to the type of services; for example,
real-time applications such as presence-enabled technologies such as Voice over IP (VoIP)
or interactive media cannot operate effectively at a loss rate of 5% which is acceptable for
typical Web browsing (Gurbani, Faynberg, Lu, Brusilovsky, Gato, & Unmehopta, 2003).
Data latency, as with data loss, is another critical parameter in VoIP and multimedia environments
where delays must not impact end-user performance; real-time interactive applications
require response times of 100 milliseconds (ms) or less.
SLA.Parameters.for.Presence-Enabled.Services
Considering the parameters that a network SLA should include, and the typical elements
of presence-enabled services, SLA parameters for presence-enabled services will include
service hours and availability, downtime and so forth, customer support levels, throughputs,
responsiveness, restrictions, functionalities, multi-platform communication domains support
(synchronous/asynchronous), multiple device support, multiple protocol support, data loss
acceptability, data security, real-time application suitability, and many other characteristics
depending upon the specific implementation scenario of the presence-enabled service.
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