Nortel ISDN Signaling Link Description, Installation And Operation page 112

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Figure 16
QoS level with G.711A/G.711U codec
800
700
600
500
400
300
200
100
Excellent
0
0
553-3001-202 Standard 1.00
ITG Engineering Guidelines
QOS level with G.711A/G.711U codec
Good
2 4
April 2000
Fair
6 8 10
Packet loss (%)
Poor
12 14 16