What are possible sources of interference for the radio frequency link of the AP?
APs with overlapping coverage and improperly spaced channel frequencies can cause interference between the APs. In addition, interference can come from a number of other sources, including 2.4-GHz cordless phones, improperly shielded microwave ovens, and wireless LAN equipment manufactured by other companies. Police radar, electric motors, and moving metal parts of machinery can also cause interference.