February 3rd, 2010 | 
Author: Dear all! The most popular packet-switched LAN technology invented at the Xerox PARC is known as the Ethernet. After it was standardized by the Xerox, Intel and digital equipment corporations, it has become the most familiar LAN technology and hence it exists in different forms.
Now it has replaced all the other technologies and used in many of the corporate and personal networks. A coaxial cable had been used to connect all the computers in the original wiring system. But the twisted pair Ethernet is the advanced technology in which Ethernet can be accessed by unshielded copper wires as in telephones.
With the twisted pair wiring, installation becomes easy and hence it requires very low capital cost. Usually every computer and the Ethernet hub are connected by a set of eight wires. But out of eight wires, only four are effective. These four wires are divided into two pairs.
One pair is used to carry data from the computer to the hub and the other to carry data from the hub to the computer. All the signals carried by the Ethernet cable are simulated by the hub. For reliable operation, the distance between a hub and a computer should not exceed 100 meters.
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