Interference Detection to Isolate and Locate Network Interference
Another common problem in WLAN implementation is the detection and elimination of RF interference.This is typically done via an initial site survey where any pre-existing interference is detected and removed, if possible, followed by periodic follow-up surveys. Besides being time consuming, these surveys often do not catch the interference when it is actually occurring so the WLAN appears to have intermittent connectivity or latency issues in areas and a cause is unidentified. Since RF interference can be caused by something as simple as a cordless phone operating in the 2.4 GHz range, these problems can be difficult to track down. With the Cisco wireless-aware LAN, the entire WLAN (consisting of APs and client wireless adapters) are scanning for RF interference along with their normal scanning for rogue APs. Because of this, causes for interference can be identified the moment they occur.This can help a great deal in providing a higher QOS throughout a WLAN environment. All information from the APs and client wireless adapters are sent to the WLSE where the information is centrally available for the network administrator.The WLSE can show the administrator the type of interference detected, the location of the interference, and whether it is caused by a rogue AP or some other wireless broadcast.
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