Nortel 1000 Fundamentals page 149

Table 32
R value translation
R Value (lower limit)
90
80
70
60
50
0
Use
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 proprietary.
Table 33
IP Trunk 3.01 (and later) QoS levels
Network Packet
delay (ms) loss (%)
0 – 49 0
49
49 2
49 4
49 8
50 – 99 0
99 1
99 2
99 4
99 8
100 – 149 0
149 1
149 2
149 4
149 8
150 – 199 0
Copyright © 2007, Nortel Networks
.
Table 33 "IP Trunk 3.01 (and later) QoS levels" (page 149)
G.711
20
excellent
excellent
good
fair
poor
excellent
good
good
fair
poor
good
good
fair
fair
poor
fair
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 02.01 Standard
Release 5.5 21 December 2007
MOS User Satisfaction
4.5 Very satisfied
4.0 Satisfied
3.5
Some users dissatisfied
3.0 Many users dissatisfied
2.5 Nearly all users dissatisfied
1
Not recommended
QoS level
G.729A/AB
30
good
fair
fair
poor
not recommended
fair
fair
fair
poor
not recommended
fair
fair
poor
poor
not recommended
poor
Measure intranet QoS 149
to estimate
G.723.1 (6.3 Kbps)
30
fair
fair
fair
poor
not recommended
fair
fair
poor
poor
not recommended
fair
poor
poor
not recommended
not recommended
poor