Getting weird with wireless.....

evening is quite a boring time to spend here :(, with nothing really exciting to do. all you can think about after 9 hrs of classes is to get some rest. but it seems gods had a different plan today. i was tweaking with my wireless router, when it just occurred to me how wonderful a thing is wireless. so i just thought to start a series about the what's and how's of wireless. and what could be a better forum than this blog.
it will be trivial to say that the world of wireless technologies is unbounded(yet, i said that :D).
so to start with i choose one very familiar topic-BLUE TOOTH. just as a matter of fact(though many of the readers may be knowing this), i must mention that Blue tooth was named after a 10th century Viking King, Harald Blatand (Bluetooth in English), who united Denmark and Norway - hence the inspiration for the idea of 'uniting devices with Bluetooth'. ( good analogy.. :D )

Bluetooth started in 1998 when five major companies (Ericsson, Nokia, IBM, Toshiba, and Intel) formed a group to create a license-free technology for universal wireless connectivity in the handheld market. Today, there are more than 800 companies using Bluetooth technology in their devices. and needless to say, we're witnessing the v2 today.

so what exactly goes behind a Bluetooth device, lets talk in some detail.
first things first.... core specifications.....
As with other technologies, Bluetooth also has a Bluetooth protocol stack which differs from the "classical" seven-layer networking model in some ways... (we leave "seven layer networking" for some other day)
At the base is radio frequency protocol... next comes Baseband.. followed by Link manager protocol, Audio, Data, HCI Protocol, Service Discovery protocol and lastly the Applications...

radio frequency - The radio is the lowest layer. Its interface specification defines the characteristics of the radio front end, frequency bands, channel arrangements, permissible transmit power levels, and receiver sensitivity level.
what makes bluetooth a license free technology is its 2.4-GHz ISM(Industrial, scientific, and medical) which is globally available for license free usage. though this specification varies around the world (US and countries like Spain and France using different Bandwidths for the same purpose), bluetooth ingeniously overcomes this problem by providing 79(yes 79!) 1 MHz spaced bands for US and most of Europe while 23 1 MHz spaced bands for japan, france and spain.

watch out for "why bluetooth is a success and security issues related to bluetooth" in our next post... :)