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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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