Page 32 of 206 Planning
553-3001-304 Standard 3.00 September 2004
Site survey
To conduct a site survey, set up an AP at a particular location. Use a computer
equipped with a wireless LAN device and site survey software or a
Nortel Networks WLAN Handset 2210/2211 operating in Site Survey mode
to measure the strength of the signal from the AP. Move the wireless device
around and repeat the measurements to determine the optimum number and
best locations for the APs. This method helps identify dead zones and areas
where building materials or other factors affect the performance of the
network.
Site Survey mode
The WLAN Handsets 2210/2211 Site Survey mode displays negative dBm
levels. These levels represent the strength of the received signal (Received
Signal Strength Indication or RSSI) from an AP. The RSSI information aids
in determining if WLAN coverage is adequate.
For information on using the Site Survey mode, refer to“Testing signal
strength with the WLAN Handset 2210/2211” on page 107.
Note: The WLAN Handsets 2210/2211 do not require connectivity to a
2245 IP Telephony Manager or the Call Server to enable the Site Survey
mode to be used. The minimum configuration required is the Extended
Service Set Identifier (ESSID) of the WLAN or test AP and the WEP
keys, if applicable.
AP requirement considerations
Each site is unique in its AP requirements. Consider the following points
when determining how many APs are needed and where they should be
placed:
• Minimum Radio Signal Strength – All APs in the coverage area must
receive a signal strength better than -70 dbm. Measurement is made in
negative dbm, which measure the amount of signal loss due to distance.
Therefore, stronger signals are those with smaller values. For example,
–50 and –60 indicate stronger signals than -70; –80 is a weaker, poorer
signal than –70.
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