Nortel 1000E Maintenance Manual page 96

96 Clearing faults
automatically or when the technician requests a report with the PRT QOS
<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
"Campus data network voice quality measurements" (page 96)
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 and at the MG 1000T Core for the MG 1000T
Expansions.
Systems must meet the minimum data networking requirements from Converging
the Data Network with VoIP Fundamentals (NN43001-260).
Copyright © 2007, Nortel Networks
.
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
ATTENTION
Nortel Communication Server 1000
Communication Server 1000E Maintenance
NN43041-700 01.02 Standard
Release 5.0 20 June 2007
PDV Min
0.5 ms
<12 ms
12 - 32 ms
32 - 52 ms
>52 ms
Table 33
for the Data
Packet loss
< 0.5%
0.5 - 1%
1 - 1.5%
> 1.5%