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Chapter 6. Bluetooth > Bluetooth Standards Today

6.1. Bluetooth Standards Today

Bluetooth is a wireless communication technology that is designed for short-range, point-to-point data transfer. Like infrared, Bluetooth is well suited for ad-hoc applications where the presence of a network infrastructure is not available. However, unlike infrared, Bluetooth does not have the limitation of requiring line of sight for communication. Bluetooth uses radio waves in the 2.4 GHz band. Coincidentally, this is also the band used by 802.11b and 802.11g devices. Unfortunately, a lot of domestic appliances also use this 2.4 GHz band, most notably cordless phones and microwave ovens. This means that this 2.4 GHz frequency band (also known as Industrial, Scientific, and Medical, or ISM) is crowded (see Interference Between Bluetooth and Other Devices in this chapter).

Sidebar 1. Interference Between Bluetooth and Other Devices

If you are operating an 802.11b (or 802.11g) network together with Bluetooth, Bluetooth performance will take a minor, generally unnoticeable hit. Since both operate in the 2.4 GHz band, interference will cause Bluetooth devices to resend their data. Well, if your father is operating his microwave in the kitchen, that is also going to interfere with your wireless network, whether it is Bluetooth or 802.11. When you are deciding where to put your computers and access points, you need to take this into consideration.



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