10 Communicatin Network.ppt Compatibility Mode

8/8/2019 10 Communicatin Network.ppt Compatibility Mode

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Pertemuan 10

Understanding Communicationsand Networks

1


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Learning Outcomes

Pada akhir pertemuan ini, diharapkan mahasiswa

akan mampu :

menunjukkan contoh pemanfaatan

komputer untuk berkomunikasi dan jenisjaringannya

2


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Outline Materi

Computer for Communications

Networks

Communication Devices

Transmission Media

3


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Communications

What is needed for successfulcommunications?

4

Sending

device initiates

instruction to

transmit data,

instructions, or

information

Communications

device connectsthe communications

channel to the

receiving device

Receiving

device acceptstransmission of data,

instructions, or

information

Communications

device connects

the sending device to

the communications

channel

Communications

channel media

on which data,

instructions, or

information travel


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Communications

What are computer communications?

5

set-top boxes

mainframecomputers

smart

phones

notebook

computers servers

Web-enabled

PDAs

desktopcomputers

Tablet PCs

GPS

receivers

Process in which two or more computers or devices transfer data,

instructions, and information


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ses o ompu er

Communications

What is a global positioning system (GPS)?

6

Step 1.GPS satellites orbit

Earth. Every

thousandth of a

second, each satellitesends a signal that

indicates its current

position to the GPS

server.

Step 2.A GPS receiver

(such as in a car,

a PDA, a watch,a handheld

device, or a

collar)

determines its

location on Earth

by analyzing at

least 3 separate

satellite signals

from the 24

satellites in orbit.


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Networks

What is a network?

7

Collection ofcomputers anddevices connected

viacommunicationsdevices andtransmissionmedia


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Networks

What is a local areanetwork (LAN)?

8

Network in limitedgeographical area

such as home oroffice building Metropolitan area

network (MAN)connects LANs in cityor town


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Networks

What is a wide

area network(WAN)?

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Network that

covers largegeographic areausing many typesof media

Internet is worldslargest WAN


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Networks

What is a

client/servernetwork?

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One or morecomputers act asserver and othercomputers, or clients,access server


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Networks

What is a peer-to-peer network?

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Simple networkthat connects

fewer than 10computers

Each computer,or peer, has

equalcapabilities


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Networks

What is a bus network?

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All computers and

devices connect to

central cable,

or bus Example ofnetwork

topology (layout of

devices in network)

Popular topologies are

bus, ring, and star


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Networks

What is a ring network?

13

Cable forms closed

ring, or loop, with all

computers and devices

arranged along ring Data travels from

device to device

around entire ring, in

one direction


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Networks

What is a star network?

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All devices connect to

a central device, called

hub

All data transferredfrom one computer to

another passes

through hub


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Networks

What are TCP/IP and 802.11?

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TCP/IP (Transmission Control Protocol/Internet

Protocol) technology transmits data by breaking it up

into small pieces, or packets

Commonly used for Internet transmissions

802.11 is family of standards for wireless LANs


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Networks

What is Bluetooth?

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Short-range radio wavestransmitdata

betweenBluetoothdevices


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Networks

What are IrDA, RFID, and Wireless

Applications Protocol (WAP)?

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IrDAIrDAspecification allows

data to be transferred

wirelessly via infrared

light waves

IrDAIrDAspecification allows

data to be transferred

wirelessly via infrared

light waves

Wireless ApplicationsWireless Applications

Protocol (WAP)Protocol (WAP)

allow wireless mobile devicesto access Internet

Wireless ApplicationsWireless Applications

Protocol (WAP)Protocol (WAP)

allow wireless mobile devicesto access Internet

Radio FrequencyRadio Frequency

Identification (RFID)Identification (RFID)uses radio signals to communicate

with a tag placed in an object


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Networks

What is an intranet?

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Extranet allows customers or suppliers to access

part of companys intranet

Typically includes connection to Internet

Makes information accessible to employees

Internal network that uses Internet technologies


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Communications Over the Telephone

Network

What is the publicswitched telephonenetwork (PSTN)?

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Worldwidetelephone systemthat handles voice-

oriented telephone

calls


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Network

What is a dial-up line?

20

Temporaryconnection usingtelephone line for

communications Costs no morethan makingregular call

Computers at any

two locations canestablish aconnection usingmodems andtelephone network


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Network

What is adedicated line?

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Four types areISDN line, DSL, T-carrier line, andATM

Always-onconnection between

two communicationsdevices


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Network

What is an ADSL (asymmetric digitalsubscriber line)?

22

Popular type of

DSL (Digital

SubscriberLine)

Faster when

receiving data

than whensending data

Ideal forInternet access


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Communications Devices

What is a dial-up modem?

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Converts digital signals to analog signals and vice versa

Notebook computers often use PC Card modem


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What is a cable modem?

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Sends andreceives dataover cabletelevisionnetwork

Much fasterthan dial-upmodem or

ISDN Sometimes

called abroadbandmodem


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What is a network card?

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Adapter card, PCCard, or compactflash card that

enables computeror device toaccess network

Sometimes called

network interfacecard (NIC)


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What is a wireless access point?

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Centralcommunicationsdevice that allows

computers anddevices to transferdata wirelesslyamong themselves

or to wired network


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What is a router?

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Connectscomputers andtransmits data to

correct destinationon network

Routers forwarddata on Internet

using fastestavailable path


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What is a hub?

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Device that providescentral point for cables innetwork


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Home Networks

What is a home network?

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Multiple computersconnected in home

Several types of home

networks Ethernet connect

computers via cable

Powerline cableuse electrical lines in house

Phoneline usetelephone lines

HomeRF (radiofrequency) wireless


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Communications Channel

What is a channel?

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Transmission media on which data travels incommunications system

Bandwidth is amount of

data that can travel

over channel

Transmission mediaare materials capable of

carrying one or more

signals


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Physical Transmission Media

What is physical transmission media?

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Transfer Rates for Various Types of LANs Using Physical Transmission Media Wire, cable,and othertangiblematerials used

to sendcommunicationssignals


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What are twisted-pair cable and coaxial cable?

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Twisted-pair cable is used for telephone systems and networkcabling

Coaxial cable is often used for cable television wiring


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What is fiber-optic cable?

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Capable of carryingsignificantly more

data at faster speeds

than wire cables Less susceptible

to interference(noise) and,

therefore, more

secure

Smaller size (thinnerand lighter)


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Wireless Transmission Media

What is wireless transmission media?

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Used when inconvenient, impractical, or impossible to

install cables

Includes Bluetooth and IrDA


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What are broadcast radio and cellular radio?

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Broadcast radiodistributes radiosignals over long

and shortdistances

Cellular radiois form of

broadcast radioused for mobilecommunications


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What is a microwave station?

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Earth-basedreflectivedish used for

microwavecommunications

Must transmit instraight line with

no obstructions


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What is a communications satellite?

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Space station

that receives

microwave

signals fromearth-based

station,amplifies

signals, and

broadcastssignals back to

any number of

earth-based

stations


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Source : Shelly, Gary B. DiscoveringComputers (2004/2005/2006). Thomson

Course Technology. PPT for Chapter 9.

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10 Communicatin Network.ppt Compatibility Mode