The unlicensed nature of radio-based wireless LANs means that other products (2.4 GHz cordless phones, microwave ovens, garage door openers, Bluetooth® devices) that transmit energy in the same frequency spectrum can potentially interfere with a WLAN system. Older microwave ovens are a concern, but most WLAN manufacturers design their products to account for microwave interference.
Radio frequency interference can also occur if two WLAN routers are located in close proximity to each other. This situation is usually dealt with by placing each WLAN on a different radio frequency channel within allowed frequency range. See your router manufacturer's documents for directions on how to do this.
This applies to: