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Whenever we talk about network or data communication, we frequently mention about the OSI Model. OSI Model is the basic structure of network communication. Though the data communication looks prity simple and straight forward to the end users, but this occures through some indepedent steps. We mention these steps as layers of the Model.

In the year 1977, the International Organization for Standardization came up with the OSI Model. the OSI is the short form of Open Systems Interconnection. The OSI Model consists of the Basic Referance Model and specific protocols.

In the OSI Model there are 7 layers, responsible for totally indepedent but corelated activity for successful data communication. The layers are Application layer, Presentation layer, Session layer, Transport layer, Network layer, Datalink layer, Physical layer. Verious text books and many otehr documentaions shows the order of the layers as mentioned above. But as a suggestion I can request to remenber the layers from the Physical layer i.e. the order will be  Physical layer, Datalink layer, Network layer, Transport layer, Session layer, Presentation layer, Application layer. As we go further, you can see that the Physical layer is mentioned as Layer-1, Datalink layer as Layer-2 … and so on. Let’s have a look into the activity of the layers, how they accomplish a successful data communication.

Cast: Dev, Subhashree Ganguly, Biswajit Chakraborty, Laboni Sarkar, Rajatava Dutta, Kharaj Mukhopadhyay and others
Director: Raj Chakraborty

Tale of a love story where two college mates fall in love but their family is not ready to accept them yet.

Challenge revolves around a young girl with a rather obsessive father, who in a bid to protect his daughter keeps her away from all young men. Seeing that no man would have the courage to face her dad, the girl looks out for a man, whose unique qualification would be to stand up to her dad.

Some good music and dance moves along with some nonstop action makes this a fun move to watch. Jeet Ganguly is the music director for movie and he once again proved his mastery with new age music. His songs in another Bengali movie 'Chirodin Tumi Je Amar' received a huge response from both Kolkata and Bangladeshi fans. Music tracks from 'Challenge' are expected to do the same.

There are two types of films – art films and commercial films. commercial cinema has its own attributes, and contains song and dance sequences. In case of art films, the storyline is generally serious and slow. Angshumaner Chhobi doesn’t fall into either of these ategories. It has pace, and music and horeography play a key role in it. It has some layers, but it’s not an intellectual film. It has a simple, straightforward storyline.

It’s about four people who are involved in making a film. Angshuman (Indraneil Sengupta), the protagonist, is the filmmaker. The other characters are veteran actor Pradyut Mukherjee (Soumitra Chatterjee), National Film Award winning actress Madhura (Indrani Halder) and Nil (Tota Roychowdhury). These characters come together during the making of the film, and the story takes a turn from there. At one point, one wonders whether Angshuman would be able to complete the film.

Analytics firm Pinch Media, which spotted the iPhone 3GS roaming online last year, now says it's seen the device string for the new iPod multiple times since April.

At least "a few dozen" different examples have been spotted and have all exhibited a familiar pattern of running about two dozen major, frequently used third-party apps. Few common threads exist other than the apps' popularity, Pinch says. The usage pattern repeats the one seen for the iPhone 3GS and directly suggests that Apple is testing compatibility with the new iPod touch to guard against any show-stopping flaws before the device goes live.