Recommendation ITU-T Y.1541 IP QoS Classes and Objectives
QoS Classes and Objectives
Network
Performance
Parameter
Nature of
Objective
Class 0 Class 1 Class 2 Class 3 Class 4 Class 5
IP packet
transfer delay
(IPTD)
Upper bound on
the mean IPTD
100ms 400ms 100ms 400ms 1 s Unspec.
IP packet
transfer delay
variation
(IPDV)
Upper bound on
the 1-10
-3
quantile
of IPTD minus the
minimum IPTD
50ms 50ms U U U Unspec.
IP packet loss
ratio (IPLR)
Upper bound on
the packet loss
probability
1.10
-3
1.10
-3
1.10
-3
1.10
-3
1.10
-3
Unspec.
IP packet error
ratio (IPER)
Upper bound 1.10
-4
Unspec
Tab. 8 - Recommendation QoS services
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