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FHSS systems use frequently changing, narrow bands over all channels. 11b WLANs and Bluetooth within the enterprise. 11b WLANs and Bluetooth. Multiple companies have researched the issue and concluded that if the two technologies are separated by two meters or more, there is no significant interference. 4 GHz range (DSSS and FHSS). Depending on the conditions and the manufacturer, degradation to the WLAN can vary from unnoticeable to a total loss of association between the client and the AP. Interference from the WLAN can also impact the voice quality.

For example, if WLAN coverage is required only in the buildings, then the amount of RF coverage outside the building can be minimized by AP placement and directional antennas. Cisco AVVID Wireless LAN Design 956608 2-17 Chapter 2 WLAN Radio Frequency (RF) Design Considerations Planning for RF Deployment RF Environment The performance of the WLAN and its equipment depends upon its RF environment. 4 GHz lighting systems) • Air conditioning duct-work • Other radio equipment • Microwave ovens • Other WLAN equipment A site survey should be performed to ensure that the required data rates are supported in all the required areas, despite the environmental variables mentioned above.

WLAN equipment such as APs should not be located near microwave ovens. • Co-channel Interference—Interference can from radios in adjacent cells on the same frequency. Effective site surveying and WLAN cell planning should minimize the effect of this interference. As WLANs become more prevalent, interference from sources outside enterprise control may become more of an issue, such as in multiple tenancy situations (shopping centers, apartment blocks, and the like). Proper cell planning of the channel frequency and careful layout of the AP can minimize the interference.

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Cisco AVVID Wireless LAN Design


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