Nortel 1000 Fundamentals page 148

148 ITG engineering guidelines
This model already takes into account some characteristics of the IP Phone,
and therefore the impairment factors are not identical to those shown in
the ITU-T standards.
Refer to
values into user satisfaction levels.
Table 29
Impairment factors of codecs
Table 30
Impairment factors due to network delay
* Network delay is the average one-way network delay plus packetization and
jitter buffer delay.
Table 31
Impairment factors due to packet loss
Copyright © 2007, Nortel Networks
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Table 32 "R value translation" (page 149)
Codec
G.711
G.729A/AB
G.729A/AB
G.723.1 (5.3 Kbps)
G.723.1 (6.3 Kbps)
Network delay* (msec)
0 - 49
50 - 99
100 -149
150 - 199
200 - 249
250 - 299
Packet loss (%)
0
1
2
4
8
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 02.01 Standard
Release 5.5 21 December 2007
for the translation of R
Codec Impairment (lc)
(msec frames)
0
11 - 20 or 30
16 - 40 or 50
19
15
Delay Impairment (ld)
0
5
10
15
20
25
Packet Lose Impairment (lp)
0
4
8
15
25