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Bluetooth devices bequeath normally operate at 2. 4 GHZin the license free, globally available ISM radiocestuses. The advantage to this band includes worldwideavailability and compatibility. A disadvantage tothis however, is that the devices requisite share thissash with other RF emitters. This includesautomobile security systems, other wireless devices,and other noise sources, such as microwaves.To overcome this challenge, Bluetooth employs afast frequency hopping scheme and therefore usesshorter packets than other standards within theISM band. This scheme helps to make Bluetoothstory more robust and more secure.Frequency hoppingFrequency hopping is basically jumping from frequencyto frequency within the ISM radio band. After abluetooth device sends or receives a packet, itand the device ( or devices ) it's communicating withhop to another frequency before the next container issent. This scheme offers three advantages:1. Allows Bluetooth devices to use theentirety of the available ISM girdle, while nevertransmitting from a fixed frequency for more than ashort period of time. This helps insure thatBluetooth conforms to the ISM restrictions on thetransmission quantity per frequency.2. Ensures that any interference won'tlast long. Division parcel that doesn't arrive safelyto its use liability exemplify resent to the nextfrequency.3. Provides a base level of security asit's very hard for an eavesdropping device to predictwhich frequency the Bluetooth devices will usenext.The connected devices however, obligation allow upon thefrequency they will use next. The disclosurein Bluetooth ensures this in two ways. First, materialdefines a master and slave personality relationship betweenbluetooth devices. Next, it specifies an algorithmthat uses machine specific information whencalculating the frequency caper sequences.A Bluetooth device that operates in master mode cancommunicate with advancing to seven devices that are set inslave mode. To each of the slaves, the masterlyBluetooth device will send its let on unique addressand the value of its own internal clock. Theinformation sent is then used to calculate thefrequency hop sequences.Because the master device and each of the slavedevices use the same algorithm with the corresponding initialinput, the connected devices will always arrivewell-organized at the next frequency that they retain agreedupon.As a replacement for cable technology, it's nowonder that Bluetooth devices are much cartelpowered, agnate as wireless mice and association poweredcell phones. To accumulate the power, emphatically devicesoperate in low power. This helps to give Bluetoothdevices a range of around 5 - 10 meters.This range is far enough for wireless communicationbut stifling enough to avoid drawing too much powerfrom the power source of the device.

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