Nortel Communication Server 1000E Maintenance Manual page 96

96 Clearing faults
<cab#> command in LD 117. See Software Input/Output Administration
NN43001-611 and Software Input/Output Reference – Maintenance
NN43001-711.
Data Network Ratings (Excellent, Good, Fair, and Poor) are calculated
along with the actual parameter values for the network delay. See
33 "Campus data network voice quality measurements" (page 96)
Data Network Ratings parameters for specific values of Packet Delay
Variation (PDV) and packet loss.
Table 33
Campus data network voice quality measurements
Excellent
Good
Fair
Poor
The values presented in
measurements" (page 96)
mechanism and no particular mechanism for recovering lost packets.
The command PRT PDV <cab#> in LD 117 displays both the current size
of the PDV buffer and the number of PDV underflows.
In addition, a warning message is printed when a parameter threshold or a
combination of thresholds is reached. You cannot configure the thresholds.
In LD 117, the command CHG PDV <port#> <delay> is used to configure
a PDV buffer size for each link basis. The <delay> parameter can take
values from 0.5 ms to 8 ms. This value should be initially tested at default
settings. Increase the <delay> parameter value by 0.5 ms increments if
an unacceptable level of voice quality is experienced ("pops and clicks").
Decrease this value if an echo is experienced. The goal is to operate with
the smallest buffer possible.
The PDV buffer size for each IP connection is configured at the Call Server
for the MG 1000Es.
ATTENTION
Systems must meet the minimum data networking requirements from
Converging the Data Network with VoIP Fundamentals NN43001-260.
PDV Max
7.8 ms
<5 ms
5 - 25 ms
25 - 45 ms
>45 ms
Table 33 "Campus data network voice quality
assume that there is no echo cancellation
Nortel Communication Server 1000
Communication Server 1000E Maintenance
NN43041-700 04.01 4 June 2010
Copyright © 2004-2010 Nortel Networks. All Rights Reserved.
PDV Min
0.5 ms
<12 ms
12 - 32 ms
32 - 52 ms
>52 ms
Table
for the
Packet loss
< 0.5%
0.5 - 1%
1 - 1.5%
> 1.5%