General Wlan Configuration - Avaya Communication Server 1000 Installation And Commissioning Manual

Troubleshooting WLAN IP Telephony installations
7
8

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.
220 Avaya WLAN IP Telephony Installation and Commissioning
AP:1230 3650 connected to APs 6509 connected to 2245
policy-map trust -voice-2245
class voice-sig set ip dscp 40
class voice-bearer set ip dscp
46
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
November 2010