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automatically select the channel for you upon initial setup but, depending on your wireless environment, it
could lead to slow Wi-Fi speeds and interference.
Non-Overlapping Channels
Each channel on the 2.4 GHz spectrum is 20 MHz wide. The channel centers are separated by 5 MHz, and the
entire spectrum is only 100 MHz wide total. This means that the 11 channels have to squeeze into the 100
MHz available, and in the end, overlap. There are three channels that don’t overlap: 1, 6 and 11.
Main causes of WiFi Interference
Figure 144: Cause of Wi-Fi Inference
Baby monitors are also a common source of Non-Wi-Fi interference.
InSSIDer will only pick up devices that
broadcast
a wireless data network such as:
Modems
Wireless Access points
Wireless network printers (running a print server)
Devices that
use
the network (laptops, phones, etc.) or that communicate on non-Wi-Fi wireless
frequency (baby monitors, cordless phones, etc.)
do not
show up on InSSIDer without the use of a
spectrum analyzer.
The following is a guideline to gauge how different materials in your home affect the signal strength of Wi-Fi.
Every
3 dB
drop is equivalent to a
50%
reduction
in power:
Dry Wall: 3 dB
Hollow Wood Door: 4 dB
Brick Walls: 6 dB
Concrete: 8 dB
Refrigerator: 19dB
A good fix for this example would be to place a Wi-Fi Extender in the opposite corner of the customer’s home
There are three filter types for InSSIDer Office: Physical, Logical and Channels.
With
Physical Grouping
, all virtual SSID's on the same radio are grouped together. Each line item then
represents one physical radio on an access point that is the host of more than one SSID (i.e.: Guest networks)
With
Logical Grouping
, all access points with the same SSID are grouped together.
