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Wireless Installation and Configuration Guide
Wireless Installation and Configuration Guide Page 52
IP Office [15-601082] Issue [1] (1 June 2006)
Site Survey Mode
Test signal strength in the covered area by performing a Site Survey. Put a wireless phone in Site
Survey Mode (see Wireless Phone Configuration) and walk the entire coverage area while viewing the
display.
The FCN key toggles between the three coverage modes described below. The wireless phone will
remain in Site Survey Mode until it is powered off. When testing is complete, and to power off the
wireless phone, press Power Off/End Call.
Numbers racing across the wireless phone display indicate access point information is being obtained. A
Waiting message indicates the system is not configured properly and the wireless phone cannot find any
access points.
Detect dBm Coverage
As you walk the perimeter, the two-line display will show the top four access points that the wireless
phone can contact in a code as illustrated below.
XXX1 YY XXX2 YY
XXX3 YY XXX4 YY
-dBm
XXX1 through XXX4 are the last four digits of the access point's MAC address. The primary
access point (the access point which had the strongest signal to this wireless phone) displays
first, followed by the three access points with the next strongest signals.
YY is the power level in dBm at which this wireless phone heard the associated access point.
Although shown as a positive number, YY represents negative dBm and lower numbers
represent stronger signals. For example, a displayed value of 40 indicates 40dBm, and is
therefore a stronger signal then a display of 50 (which indicates –50dBm). At least one access
point’s reading should be stronger than -70 dBm in all areas.
Note any areas that have inadequate dBm readings.
Detect Overlap or Conflicts
To toggle to the Site Survey function that shows the channel number of the access points, press FCN.
Use this information to detect overlaps or conflicts in access point signaling.
XXX1 YY XXX2 YY
XXX3 YY XXX4 YY
Chnl
XXX1 through XXX4 are the last four digits of the access points’ MAC address.
ZZ is the channel number that the access point is using.
Note any areas that have access points that are in contention for the same channel.
It is preferable that no overlaps exist anywhere in your facility. If that is not possible, then any location
that shares two access points with the same channel should also show at least two access points with
stronger signals that do not conflict.