> TO BLUETOOTH:
>Bluetooth is a standard used in links of radio of short scope, destined to replace wired connections betweend electronic devices like cellular telehpones. This technology allows to the users instantaneous connections of voice and information between several devices in real time. The way of transmission used assures protection against interferences and safety in sedning of information
>WORKING:
-each device will have to be equipped with a microchip taht transmits and receives in the frequency of 2.4GHz that is avaialble in the whole world (with some variation in banwith in different caountires)
-So the system can be used worldwide due to that the transmitters of radio covers 2.3ghz and 2.5ghz MHz and it is possible to select the appropriate frequency.
-Bluetooth uses FHSS that data is broken down into packets and transmitted to the receiver of the other devices over 79 hop frequencies in pseudo random pattern. Only transmitters and receivers that are synchronized on the same hop frequency pattern will have access to the transmitted data.
-The transmitter switches hop frequencies 1,600 times per second to assure a high degree of data security
-Weak signals of 1milliwatt in the range of 10 cm to 10 metres, which can be increased to 100m by increasing trasmit power
>bluetooth created a personal area network or piconet
>TOPOLGOY:
>Piconet: usually a bluettooh network refers to as piconet use a master slave conrol when and where different devices want to send wata. In this model seven slave devices can connect with a single master device. The master device coordiantes communicatoin trhough piconet. It can send data to the slave and request data as well. Slaves are only allowed to transmit to and receive from their master device. If master is connected to one slave it is called point to point, else point to multipoint, in whcih all slaves follows FHSS from master. n general, good applications of piconet network is wireless headphones and dialup networking between laptops
and mobiles
>Scatternet: master and slave connected together form a piconet and different piconets linked together to form a scatternet to cover much wider area. In scatternet a piconet master may work as slave in scatternet.
>PROTOCOL STACK:
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