Rf Basics And Ap Configuration - Avaya Communication Server 1000 Installation And Commissioning Manual

interference, Ethernet duplex mismatch, excessive retransmission of packets, or
other RF interference.

RF basics and AP configuration

The following points include the characteristics of a good RF environment that uses access
point parameters for Avaya wireless telephone voice communications. Only channels 1, 6, and
11 are used.
• Disable auto-channel select features and use fixed channels.
• Fix the transmit (TX) power setting and disable auto-power features.
• Ensure that access points have a consistent and same power setting, unless there is a
compelling reason to deviate
• Configure areas where wireless telephone users can congregate with special care:
- Position APs closer together to provide greater bandwidth for an area.
- Turn down the AP TX power.
It is a very complicated process to accomplish this task properly.
• Configure the wireless telephone transmit power levels to match the standard for the RF
environment.
Consider the antenna gain used on the access points when adjusting the wireless
telephone power setting.
• Ensure that there is -70dBm RF signaling or better available in all areas designated for
wireless telephone operation.
For this signaling requirement, all four 802.11b data rates must be available to the wireless
telephones. The four 802.11b data rates are: 1Mb/s, 2Mb/s, 5.5Mb/s, and 11Mb/s.
The best configuration is for all four to be configured to Basic or Required. For
manufacturer-specific settings, see the guidelines for Avaya 6120/6140 WLAN Handset .
Define this parameter, as Basic or Required, in the AP and configure the following:
- 802.11g data rates can be configured to Enabled.
- Multicast packets use only 802.11b data rates configured to Basic or Required.
- If 802.11 wireless devices are used, 5.5Mb/s and 11Mb/s can require the parameter
be configured to Enabled or Supported, rather than Basic.
Ensure that there is a compelling reason to do so, before you make this change.
• Configure the Beacon interval to 100 ms and DTIM to 3.
Avaya WLAN IP Telephony Installation and Commissioning
Quality of Service checklist for voice over WLAN applications
November 2010 229