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CHAPTER 1 3 INFORMATIC PRACTICES XII WEB.pdf


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COMPUTER NETWORKING

Networking Hardware
To form a computer network a lot of hardware devices are required. Some of these
devices along with their functionalities are mentioned below :
Transmission Media
Computers on a network are able to share data and other resources. They are also able to
communicate among themselves. To make all this possible there must be some medium
over which the data can travel from one computer to another. A medium of data
transmission over a computer network is called a channel or a transmission medium.
Channels may be guided (wired) or unguided (wireless).
A transmission medium is a medium of data transfer over a network. It can be wired
or wireless.
Wired Media
A number of various types of cables are used to transfer data over computer networks.
These are Twisted Pair Cable, Co-axial Cable, and Optical Fiber Cable. Let us know about
these in some details.
Twisted Pair Cable - This is probably the most widely used cable for creating small
computer networks. It contains four twisted pairs covered in an outer shield. These pairs
are colour coded. An RJ-45 connecter is used to connect this cable to a computer. It is of
two types:
UTP (Unshielded Twisted Pair): As the name suggests in UTP cables individual pairs are
not shielded.

UTP Cable

4

UTP Cable
With RJ-45 Connector