Nortel Networks NN43001-504 manual Jitter removal for packets going to the AP

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

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