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Access point planning 35
• Number of wireless handsets per AP—Estimate the number of wireless
handsets and the anticipated call volume per AP area to ensure
that the maximum number of calls per AP is not exceeded. For the
maximum number of calls per AP for each supported manufacturer,
see “Compatible Access Points” (page 215).
• The data rates at which the wireless handsets operate—Higher data
rates (such as 11Mbs) can only be sustained while well within the
range of the AP. If the wireless handsets are operating near the limits
of the radio frequency (RF) coverage from the AP, they automatically
drop to 1 Mbs operation.
handsets require approximately:
—
7% of available bandwidth per call at 11 Mbs operation
— 10% of the available bandwidth per call for 2 Mbs operation
— 15% of the available bandwidth per call for 1 Mbs operation.
ATTENTION
These requirements mean that areas with a high-use density must receive
RF coverage at the highest data rate of operation.
•
LAN bandwidth—Estimate anticipated peak call volume to ensure that
enough bandwidth is available to handle the network traffic generated
by all the wireless handsets. Handsets require approximately 150 kbps
of bandwidth per call. Network traffic can be monitored and analyzed
using a network sniffer or an SNMP workstation.
•
Number of other wireless devices per AP—The wireless handsets can
share bandwidth with other wireless devices. To ensure adequate RF
bandwidth availability, consider the number of wireless data devices
in use per AP.
ATTENTION
In a very large or complex site, it can be advisable to contract a professional
site survey.
Effective site survey
Consider the following points for an effective site survey.
Network usage
Examine the network usage:
• How many people use a wireless handset?
• What areas of the site require wireless handset access?
• How many hours each day are wireless handsets typically in use?
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504 03.04 Standard
23 September 2008
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.