10 communicatin network.ppt compatibility mode
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Pertemuan 10
Understanding Communicationsand Networks
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Learning Outcomes
Pada akhir pertemuan ini, diharapkan mahasiswa
akan mampu :
menunjukkan contoh pemanfaatan
komputer untuk berkomunikasi dan jenisjaringannya
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Outline Materi
Computer for Communications
Networks
Communication Devices
Transmission Media
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Communications
What is needed for successfulcommunications?
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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?
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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)?
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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?
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Collection ofcomputers anddevices connected
viacommunicationsdevices andtransmissionmedia
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Networks
What is a local areanetwork (LAN)?
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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?
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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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Communications Over the Telephone
Network
What is a dial-up line?
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Temporaryconnection usingtelephone line for
communications Costs no morethan makingregular call
Computers at any
two locations canestablish aconnection usingmodems andtelephone network
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Communications Over the Telephone
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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Communications Over the Telephone
Network
What is an ADSL (asymmetric digitalsubscriber line)?
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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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Communications Devices
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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Communications Devices
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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Communications Devices
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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Communications Devices
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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Communications Devices
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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Physical Transmission Media
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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Physical Transmission Media
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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Wireless Transmission Media
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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Wireless Transmission Media
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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Wireless Transmission Media
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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