How Does Bluetooth Work (Simplified)

Bluetooth is a term well-known to almost everyone nowadays, here we shall quickly inspect the basic working principle of Bluetooth communication.

The communication between humans and between electronic devices is more or less the same. While starting a conversation with anyone, we need to know what language we will be speaking in and also need to make sure that we speak in a grammatically correct manner so that it makes sense. Similarly, when two devices need to talk, they have to decide on how they will talk (through wires or without wires,etc.), what is going to be their data transmission specifications (size,speed,etc), and many such technical aspects on which both devices have to come to an agreement before communicating. Bluetooth is essentially an agreement of this sort, technically known as a ‘networking standard’.

When a bluetooth device wants to exchange any information with another Bluetooth device, it first tries to setup a connection and then forms a little personal area network with it (like making an introduction to a stranger and then making him/her your friend). Most of the Bluetooth communication process works automatically through software. The user is asked to add Bluetooth devices to ‘trusted devices’ list and enter a security code to ensure that viruses or spam are not received onto the device.

 Bluetooth communication takes place between the radio frequency bands 2.4Ghz and 2.48Ghz (approx.), which has been set aside by Internationally for such purposes (Think of the band as a super wide Bluetooth highway with hundreds of lanes). The Bluetooth devices select around 75 frequencies from this band and keep changing the frequency thousands of times every second together (a process called spectrum frequency hopping), (imagine a high traffic road that have groups of cars going in a synchronised manner) Since the frequency changes thousands of times in a second, even if any interference happens from another Bluetooth device, it will only last for few microseconds. Such little interferences are overcome through built-in features in the Bluetooth software. Thus data is transmitted from one Bluetooth device to another effortlessly. Bluetooth usually has range in a 30 foot radius and transfers data at speeds around 3mbps. Bluetooth is highly energy efficient and uses only around 1milliwatt of energy during a transmission. 

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TOP 9 USEFUL WEBSITES THAT EVERYONE NEEDS

Though the net is saturated with a mess of millions of sites, it is often an herculean task to find the type of useful site that you really want. Here is a list of the TOP 9 USEFUL WEBSITES THAT EVERYONE NEEDS. (I do not have any deals or relation with any of these sites, they are just genuinely useful and already well-established websites :-) ). The list is not ordered in any particular priority.


1. rottentomatoes.com - The only site you will need to find anything about hollywood movies. A strongly inspected rating system from over 100 critics makes it easy for you to select good movies for your weekends.

2. ebay.com - A well known website that lets you browse through a world sized garage sale. There has even been a reported case of a guy who bought a house by starting to trade with a paperclip !! So try your luck and get a dream deal.

3 wikipedia.org - If you have been using the net for atleast a week then you definitely already know about wikipedia. Apart from being the largest active online encyclopedia for reference, it is also a nice way to discover new things about people.

4. weather.com - Any well planned trip needs a detailed weather report to be complete. This website gives you a quick and simple report of the weather of any place.

5. stumbleupon.com - Though google is a dominant force on the net to find anything, stumbleupon is unique and useful because it has a real-time value rating of content from all over the world.

6. download.com - A specialized website for finding easy downloads of any software available on the net.

7. monster.com - An unavoidable website for anyone in search of a job. Very useful to reach a wide database of available jobs from different industries and countries.

8. espn.com - The ultimate website for any sports buff. Know updated statistics and schedules of a wide range of sporting events.

9. allmusic.com - A comprehensive collection of album reviews, music and singer biographies,etc.

SPECIAL MENTION - our very own http://ibreakitdown.blogspot.com/ , your one-stop infotainment station for any useful tips and info about technology,life,health and much more.
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BY- David, New York, IT consultant in a private firm
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How Search Engines Work

A search engine is more a tool than a website.It helps you find any content that it has indexed and kept in it's desk. So far i guess its been familiar terms, now lets get into the more technical stuff.

The search engines that we use mostly deal with the world wide web. The search engine uses 'spiders' to travel through the world wide web and reviews thousands of pages of websites,blogs,forums,etc. Then the spider indexes each page and keeps them in a suitable and easily retrievable order.(think of it like an attendance register)

The crawling by the spider mostly starts from a very busy and famous site. It then checks and follows all the links available on that site. It then keeps on following links in the sites it encounters , until it has almost traveled every nook and corner of the web. (like a 'spider' searching for 'prey' on it's 'web')

So when you search for a particular term or word, the search engine just has to check it's index and show you the required page.The main words are called 'keywords'. (kinda like you check the dictionary for meanings to a specific word).

So how does the search engine know which site is best and most relevant?? Well, the spiders give a particular  value to each word and then keeps count of how many times it appears in each page. That way they know how relevant it is to your search term and can give an appropriate 'rank' to the site.

Now you know how a search engine works :-)
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