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150 ITG engineering guidelines
Packet loss (%) Packet Lose Impairment (lp)
415
825
Table 32
R value translation
R Value (lower limit)
MOS User Satisfaction
90 4.5
Very satisfied
80 4.0
Satisfied
70 3.5
Some users dissatisfied
60 3.0
Many users dissatisfied
50 2.5
Nearly all users dissatisfied
01
Not recommended
Use Table 33 "IP Trunk 3.01 (and later) QoS levels" (page 150) to estimate
the IP Trunk 3.01 (and later) QoS level based on QoS measurements of
the intranet. To limit the size of this table, the packet loss and one-way
delay values are tabulated in increments of 1% and 10 ms respectively.
The techniques used to determine and apply the information in this table
are Nortel propr ietary.
Table 33
IP Trunk 3.01 (and later) QoS levels
QoS level
Network
delay (ms)
Packet
loss (%)
G.711
20
G.729A/AB
30
G.723.1 (6.3 Kbps)
30
0–49 0
excellent good fair
49
excellent fair fair
49 2
good fair fair
49 4
fair
poor poor
49 8 poor
not recommended not recommended
50 – 99 0
excellent fair fair
99 1
good fair fair
99 2
good fair
poor
99 4
fair
poor poor
99 8 poor
not recommended not recommended
100 – 149 0
good fair fair
149 1
good fair
poor
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 01.01 Standard
Release 5.0 30 May 2007
Copyright © 2007, Nortel Networks
.