Nortel Networks NN43001-563 - page 151

Measure intranet QoS 151
•0.5% packet loss: lp = 2
Then:
R=94-0-0-2
R=92
Using Table33 "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
Tocalculate R = 94 - lc - ld - lp, use Table 29 "Impairment factors of codecs"
(page 148),Table30 "Impairment factors due to network delay" (page 148),
and Table31 "Impairment 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 Table33 "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
Tocalculate R = 94 - lc - ld - lp, use Table 29 "Impairment factors of codecs"
(page 148),Table30 "Impairment factors due to network delay" (page 148),
and Table31 "Impairment factors due to packet loss" (page 148):
•G.711 codec: lc = 11
•20 msec network delay: ld = 5
Nortel Communication Server 1000
IP TrunkFundamentals
NN43001-563 02.01 Standard
Release 5.5 21December 2007
Copyright© 2007, Nor tel Networks
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