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Quality of Ser vice checklist for voice over WLAN applications 193
RF basics and AP configuration
The following points include the characteristics of a good RF environment
that uses access point parameters for Nortel 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 from
SpectraLink. 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.
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
.