unit 5 communication network

8/4/2019 Unit 5 Communication Network

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1. Modem.

2. Modem Interfacing.

3. WAN & LAN.

4. Definition1. Transmission Speed

2. LAN Application.

3. Client - Server Computing.

4. LAN Component.

5. New network System (i.e. CANBUS, PROFIBUS,FIELDBUS).

6. Internet.

7. E-mail


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Defined modem.

Sketch modem interfacing.

Defined Wide Area network.

Defined Local Area Network.

Explain Transmission speed.


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Modem (Modulate/demodulate)

Transmission speed speed at which modem transmit data

measurement - bits per second (bps) or kilobitsper second (kbps)

Computers use digital signaland some communicationchannel uses analog signals.

Convert digital signal to ananalog signal and vice versa
http://images.google.com.my/imgres?imgurl=http://cd.tradehelper.or.kr/member/brad/ADSL%2520Modem.jpgjpg&imgrefurl=http://cd.tradehelper.or.kr/showroom/category.asp%3Fhscode%3D84&h=1912&w=2944&sz=1042&hl=en&start=6&tbnid=GDidHeTY5H-EgM:&tbnh=97&tbnw=150&prev=/images%3Fq%3DMODEM%26gbv%3D2%26svnum%3D10%26hl%3Den


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MODULATION DEMODULATION

MODEM

To convert a digital

signal into an

analog signal

To convert an

analog signal into a

digital signal


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Type of Modem

External Modem Internal Modem

PC Card Modem

Wireless Modem


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long distance transmission over large

geographical area (continent/world)

Utilize public, leased or private

communication in combinationsAn enterprise network is a WAN owned by one

company


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Middle ground between LAN and WAN

Private or public network

High speed

Large area


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Size limited to a few kilometers

Common topologies are bus, ring andstar

High data rate 4/10/16 Mbps to 100

Mbps or gigabits.


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Peer to Peer Network

Server Based Network

Client / Server Network


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Small network that

shares hardware, data or

information located onany computer in the

network

Each computer is called

peer

printer may be used by

all computers on networkprinter may be used by

all computers on network

network operating

system and

application software

installed on eachcomputer

network operating

system and

application software

installed on eachcomputer


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a server stores all the network files and

applications.

Network operation manage by Network

Operating System (NOS)Examples : Mail server, Print Server,

Communication Server.


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Server 1 or more computer that controls the network

Client other computers that can request services from

the server

client client client

serverlaser printer


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The topology describe the way

Star

Ring

BusTree

Fully connected network or mesh

Hybrid


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Bus network

All computers and devices connect to central cableor bus

Inexpensive and easy to install


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Ring networkCable forms closed ring,

or loop, with allcomputers and devicesarranged along ring

Data travels from deviceto device around entirering,in one direction


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Star network

All devices connect toa central computer,called the hub

All data transferred

from one computer toanother passesthrough hub HUB

printer


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CANBUS

- controller-area network

-vehicle bus standard designed to allow microcontrollersand devices to communicate with each other within avehicle without a host computer.

PROFIBUS

- The goal was to implement and spread the use of a

bit-serial field bus based on the basic requirements of thefield device interfaces.

FIELDBUS

- A control network used in process control and industrial

automation.
http://www.answers.com/topic/vehicle-bushttp://www.answers.com/topic/microcontrollerhttp://www.answers.com/topic/host-networkhttp://www.answers.com/topic/bit-serial-1http://www.answers.com/topic/bit-serial-1http://www.answers.com/topic/host-networkhttp://www.answers.com/topic/microcontrollerhttp://www.answers.com/topic/vehicle-bus


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Internet is worldwide collection of networks that links

millions of computers together

allows all of the computers to communicate with one

another

E-mail

Information Shopping

Meeting people

Entertainment


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Internet Protocol (IP)

language that computers use to communicate over theInternet

http://www.mmu.edu.my/~fosee/staff/jun.html

Protocol DomainName Path File Name

IP Address- Unique identifying number

- E.g. 10.0.48.50, 209.11.168.133, 74.125.19.99,209.131.36.158


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A system of world-wide

electronic communication in which a

computer user can compose a message at

one terminal that can be regenerated at the

recipient's terminal when the recipient

logs in.

unit 5 communication network

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