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General WLAN configuration 183
AP:1230 3650 connected to APs 6509 connected to 2245
7
policy-map trust -voice-2245
class voice-sig
set ip dscp 40
class voice-bearer
set ip dscp 46
8
int fastethernet 03 (the port that
is connected with 2245)
switchport access vlan xx
switchport mode access
mls qos trust cos
mls qos cos 5
service-policy input
trust-voice-2245
General WLAN configuration
The following is a list of considerations for general WLAN configuration:
•
Multicast must be configured in any WLAN for Push-to-talk (PTT) on
the WLAN Handset 2211.
•
APs use channels 1, 6, and 11.
•
APs require a 15-20dB separation for like channels to avoid cochannel
interference.
•
A one-way Performance domain is required (handset to call server):
Max 100 ms delay, Max 30 ms jitter, and Max 2% packet loss.
•
The WLAN IP Telephony Manager 2245 to AP link is (ideally) limited to
100 ms delay, 1 ms jitter and under 2% packet loss.
•
The signal Strength must be -70dB or greater to provide sufficient voice
quality and proper operation. Note that -60dB or better is required for
11 MB data rate.
• Wireless bridges are not permitted because they contribute to bottleneck
delays.
•
The transmission power must be the same on all APs and match the
power setting on the handsets.
•
AP bandwidth usage must be limited to 65 to 80% maximum for handset
usage.
•
The protocols used are: TCP, UDP, DHCP, DNS, WINS, TFTP, FTP,
ARP, ICMP, and Telnet.
•
The PTT feature uses the multicast IP address of 224.0.1.116 and is
generally isolated to a single subnet.
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
.