Nortel 1000 Description, Installation And Operation Manual page 201

Table 34
IP Trunk 3.01 (and later) QoS levels (Part 1 of 3)
Network Packet
delay (ms) loss (%)
0 – 49
49
49
49
49
50 – 99
99
99
99
99
Note: The QoS levels are equivalent to the following MOS values: See
page 101
• excellent 4.5
• good
• fair
• poor
• not recommended
Use Table 34 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 Networks proprietary.
G.711
20
0 excellent
excellent
2 good
4 fair
8 poor
0 excellent
1 good
2 good
4 fair
8 poor
for more details.
4
3
2
less than 2
ITG engineering guidelines
QoS level
G.729A/AB
30
good
fair
fair
poor
not recommended
fair
fair
fair
poor
not recommended
IP Trunk Description, Installation, and Operation
Page 201 of 644
G.723.1 (6.3 Kbps)
30
fair
fair
fair
poor
not recommended
fair
fair
poor
poor
not recommended