Server User Manual

Measure intranet QoS 151
•
0.5% packet loss: lp = 2
Then:
R=94-0-0-2
R=92
Using Table 33 "IP Trunk 3.01 (and later) QoS levels" (page 149), a value of
92 means the users are very satisfied.
Scenario 2 A campus network has the following characteristics:
•
G.711 codec
•
50 msecs delay
•
1.0% packet loss
To calculate R = 94 - lc - ld - lp, use Table 29 "Impairment factors of codecs"
(page 148), Table 30 "Impairment factors due to network delay" (page 148),
and Table 31 "Impair ment factors due to packet loss" (page 148):
•
G.711 codec: lc = 0
•
20 msec network delay: ld = 5
•
0.5% packet loss: lp = 4
Then:
R=94-0-5-4
R=85
Using Table 33 "IP Trunk 3.01 (and later) QoS levels" (page 149), a value of
85 means that the users are satisfied.
Scenario 3 A WAN has the following characteristics:
•
G.729 codec
• 30 msec network delay
•
2% packet loss
To calculate R = 94 - lc - ld - lp, use Table 29 "Impairment factors of codecs"
(page 148), Table 30 "Impairment factors due to network delay" (page 148),
and Table 31 "Impair ment factors due to packet loss" (page 148):
• G.711 codec: lc = 11
•
20 msec network delay: ld = 5
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 02.01 Standard
Release 5.5 21 December 2007
Copyright © 2007, Nortel Networks
.