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Placement guidelines for the WLAN IP Telephony Manager 2245 67
To achieve excellent voice quality, Nortel recommends using G711 CODEC
with the following configuration:
•
End-to-end delay < = 150 ms (one way)
•
Packet loss < = 0.5%
•
The maximum jitter buffer for the handsets set as low as possible.
For more information, see Converging the Data Network with VoIP
Fundamentals (NN43001-260).
The jitter budget for the link south of the WLAN IP Telephony Manager
2245 ensures that packets arrive at the handset within the 30 ms arrival
window. The evenly spaced packet flow on the outbound side of the WLAN
IP Telephony Manager 2245 allows the handset to conserve battery life by
not using extra battery power to wait for late arriving packets. It also allows
efficient roaming while the handset moves from one AP coverage area to
another. See Figure 11 "Jitter removal for packets going to the AP" (page
67).
Figure 11
Jitter removal for packets going to the AP
The following figures describe end-to-end delay for differing topologies:
•
For an example of an end-to-end delay for a LAN, see Figure 12
"Example 1: End-to-end delay and packet loss for a LAN" (page 68).
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504 01.02 Standard
Release 5.0 15 June 2007
Copyright © 2004-2007, Nortel Networks
.