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144 Chapter 10: Device Detection
AirMagnet Spectrum XT User Guide
802.11g APs are backward-compatible with 802.11b APs but offer greater data rates. However,
since they operate in the same radio frequencies as their 802.11b counterparts, they are
susceptible to RF interference caused by all wireless devices operating in the 2.4-GHz
frequency band. See 802.11b APs
.
802.11n APs, by design, can co-exist with 802.11a APs in the 5-GHz band and 802.11g APs in
the 2.4-GHz band since they all use OFDM. The presence of 802.11b devices makes
communications a little challenging in the 2.4-GHz band because it cannot understand OFDM
which is used by both 802.11b and n standards. In that case, OFDM client devices may have to
switch to the older signal modulation (DSSS) to protect their high-rate OFDM transmissions,
resulting reduced network efficiency.
Recommended Courses of Action
If you are running an 802.11a/g WLAN, the following action should be taken into
consideration when installing and managing your WLAN:
• Since radio signals from 802.11a APs travel a much shorter distance, make sure that
you have enough APs to offer adequate WLAN coverage if you are using an 802.11a
WLAN.
• If you need more than one AP, make sure to point them to different non-overlapping
channels.
• Be aware of other wireless devices that may also be operating in the same radio
frequencies and channels as your WLAN APs do. Make sure that your 802.11 WLAN
APs use different channels than those used by those competing devices.
• Upgrade your WLAN to the 802.11n standard, if you can.
• When updating to 802.11n, make sure to use “IEEE 802.11n Draft Compliant”
hardware devices.
802.11b APs
802.11b APs operate at frequencies in the unlicensed 2.4-GHz Industrial, Medical and
Scientific (IMS) band. Because the band is free and used globally, it is crowded with all kinds
of 2.4-GHz-compliant commercial products, including:
• WLAN devices (802.11g)
• Cordless phones (digital or analog)
• Bluetooth devices
• Wireless (security) cameras
• Baby Monitors (video and/or audio)
•Microwave ovens