Planning Page 33 of 206
WLAN IP Telephony Installation and Configuration
• Adjacent APs and channel interference – In order to avoid undesirable
interference from adjacent APs, ensure that adjacent APs do not use
channels that overlap on the same frequencies.
Figure 2 shows the frequencies used by each channel. In the figure,
channels on the same horizontal line do not overlap. In the coverage area
of any given AP, signals from other APs using overlapping channels
should be at least –15 to –20 dbm weaker. Because the Site Survey mode
displays signals only from APs on the same Extended Service Set ID
(ESSID), check for signals from APs using all ESSIDs to avoid channel
overlap.
Figure 2
Frequencies used by each channel
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