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From hub to switch – the Indian connection

On your early days of study of networking , the topic of topology always discuss about the star topology in which all the computers are connected to a centralized device which was mentioned on your textbook as a hub or switch .

 

So what is the real difference between the hub and a switch which looks almost identical in every aspects .

First of all hub is just an amplifier or repeater which push the information fed to one port to all other ports , ie we can say hub is just a multi-port repeater .  that is if one of the devices connected to the hub is transmitting data , other devices have no other option but to listen to it . Technically we say that hub creates a single collision domain . 

The main solution for separating  the single collision to two is to use a device called bridge  which separates your network into two collision domains . Then come to idea about creating a multi-port bridge device which will look like a hub but is intelligent enough to identify the source and destination port and create a switching path between the source and destination , there by creating multiple collision domains.

The concept was introduced and made popular by a company named kalpana   . They created and marketed a device named ether switch . If you are an indian you will guess the name of the company has some Indian connection. The co-founder of this silicon vally based  company is Vinod Bhardwaj, and Kalpana is his wife’s name  .

800px-Kalpana-switch

Cisco acquired Kalpana back in 1994 and made their products part of the catalyst range of networking switches .The catalyst 3000 range of products are originated from Kalpana ether switches .

 

 

 


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