Network Media and Network Hardware

7/29/2019 Network Media and Network Hardware

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AND

- By Mithun Kanojia


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Network mediahelps us to

connect to

internet through

computers.

In this part weare going to

cover all the

things related

on internet &

media as well.


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THESE ARE THE THREE

TYPES OF WIRES


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Coaxial cable, usually referred to as coax, is named because

it has two concentric conductors separated by insulation. The two conductors have the same axis. Coax was the original transmission media specified for

Ethernet. The following diagram illustrates the standard

configuration:

What are coaxial cable ?

CoaxialCable


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What is Twisted-Pair cable ?

Tw isted pair cablecon sis ts of four pai rsof w ires.

Tw isted pair wir ing hasbeen used to suppo r tvo ice communicat ionsfor quite a long time. It

has become thepervasive media usedfor LANs.

The tw ist ing helps

cancel ou t

interference.

The th ickness of the

w ire is h igh ly related toi ts performance.

Thicker w irestranslate it to greater

capabi l i ty to hand legreater bandw idth.

Data is transferred

us ing electr ical currentvia twisted pair w ire.

Twisted Pair Cable


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What are Fiber-Optic Cable ?

Fiber optic cables can carrythe higher frequencies of theelectromagnetic

interference.

The optical media called thefiber is cladwith aconcentric protective layer

of plastic

Fiber optic cabling is used inpairs, one fortransmitting,the other forreceiving.

Fiber- Optic Cable


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There are two types of fiber optic transmissiona. Multimode

b. Single Mode

BEST ADVANTAGE:Fiber-Optic Cable can carry data at a higher speed.


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WHAT IS WIRELESS MEDIA ?

WIRELESS NETWORKING

USES

Wireless networking is used to meet many needs. Perhaps the most common use is to connect laptop users who travel

from location to location.

These are few points thatJUSTIFYabout the wireless media:

o To span a distance beyond the capabilities of typical cabling.

o To provide a backup communications link in case of normal network failure.

o To link portable or temporary workstations.

o To overcome situations where normal cabling is difficult or financially

impractical.

o To remotely connect mobile users or networks.


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Wireless Communication


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Basic Hardware Components

Network Interface Card (NIC).

Modem.

Hub.

Switch.

Router.


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MODEM


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MODEM

o The term Modem is derived

from 2 term i.e., MOdulator&DEModulator.

o Modulator meansconverting digital signalsinto analog signals &Demodulator meansconverting Analog intodigital signals.

o Modem can be eitherinternal/external.


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A network hub orrepeater hub is a device

for connecting multiple

twisted pair or fiber

optic Ethernet devices

together.

When a packet arrivesat one port, it is copied

to all the ports of the

hub for transmission

HUB


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A switch is a device that

performs switching.

It forwards and filters

datagrams (chunk of data

communication) betweenports based on the Mac-

Addresses in the packets.

Switch


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Routers are thetraffic directors

of the global

internet.

Routers

communicatewith each other,

and forward

network ackets

Router


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The Internet is a large group ofcomputers that are connected to

each other. The Internet is used to

send information quickly between

computersaround the world.

The Internet is used for many

things, such as electronic mail,

online chat, file transfer, and theinterlinked web pages and other

documents of the World Wide Web.

INTERNET


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Dial-up connection is also known as Level Twoconnection.

This provides connection to Internet through a dial-up

terminal connection.

The computer, which provides Internet access is known as

Host and the computer that receives the access, is

Client or Terminal'.

This type of connection is also known as Remote

Modem Access connection.

Dial-up Connection


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ISDN

ISDN (Integrated Services Digital Network) offersInternet connectivity at speeds of up to 128 Kbps through theuse of digital phone lines.

ISDN is a dial-up service that has been provided bytelephone companies for many years.

To access any of these dial-up accounts you need thefollowings:

Computer Modem

Telephone Connection

Shell or TCP/IP/ISDN account from the ISP

Internet client software such as Internet browser.


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o WWW could be

very simply defined

as a Universal

Database OfKnowledge.

o It is a collection of

web pages.

World Wide Web(WWW)

Website:


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BROWSERS


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IP address classes


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Network Media and Network Hardware

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