Nortel 2245 Installation And Configuration Manual page 34

Page 34 of 206 Planning
553-3001-304 Standard 3.00
• Wireless handset range – Wireless LAN coverage must be available
wherever wireless handsets will be used. Although the typical range for
a wireless handset is comparable to that of a laptop computer utilizing a
wireless LAN PC Card, the range may not be exactly the same.
Therefore, it is preferable to use a WLAN Handset 2210/2211 to carry
out the site survey, if possible. Remember that wireless handsets might
be used in areas where data devices are not typically used, such as
stairwells, washrooms, hallways, and outdoor areas.
• 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 will not be exceeded. Refer to
Appendix B: "Compatible Access Points" on
number of calls per AP for each supported manufacturer.
• The data rates at which the wireless handsets will operate – Higher data
rates (such as 11Mb/s) 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 Mb/s operation.
WLAN Handsets 2210/2211 require approximately:
– 7% of available bandwidth per call at 11 Mb/s operation
– 10% of the available bandwidth per call for 2 Mb/s operation
– 15% of the available bandwidth per call for 1 Mb/s operation.
Note: 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. WLAN Handsets 2210/2211 require
approximately 150 kbps of bandwidth per call. Network traffic can be
monitored/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.
September 2004
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