Nortel Networks NN43001-504 manual Maximum delay, jitter and packet loss

66Planning

Before adding the WLAN IP Telephony Manager 2245 to the network:

•Ensure that the APs used in the network are Voice Interoperability for Enterprise Wireless (VIEW) certified. For more information, go to www.spectralink.com/consumer/partners/view_certification.jsp.

•Ensure that the handsets are running Nortel Phase II software (97.070 or greater).

Figure 10

Maximum delay, jitter and packet loss

Strict timing requirements dictate that the WLAN IP Telephony Manager 2245 must be placed as close as possible to the handsets, ideally in the same subnet.

End-to-end jitter, delay and packet loss budget is a general VoIP best practice:

•End-to-end delay is the time it takes for voice to go from the microphone of the sending telephone to the earpiece of the receiving telephone.

•End-to-end jitter must not exceed 30 ms north of the SVP server (PBX to the WLAN IP Telephony Manager 2245) and must not exceed 1 ms south of the SVP server (the WLAN IP Telephony Manager 2245 to the AP).

•End-to-end packet loss is the number of packets that are lost in the network.

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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