TOPIC

Data Communication

3 March

2004

© PETER KOMISARCZUK & VUW, 2004. 2

Group Member

Kaleem ullah

Dilawar Gull

Sufyan Maqsood

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TRANSMISSION MODES

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Simplex

Half Duplex

Full Duplex

A NETWORK MODEL

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Source

Transmitter

Carrier

Receiver

Destination

NETWORKS

How do we categorise?Topology, geographyTechnology

GeographicWide area networksMetropolitan networksLocal area networksPersonal networks

TechnologiesCircuit switchedPacket switched

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WHAT'S A NETWORK?CONSIDER THE PHYSICAL TOPOLOGY

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Point-to-Point Connections:

WHAT'S A NETWORK?CONSIDER THE PHYSICAL TOPOLOGY

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Point-to-Multipoint Connections:

WHAT'S A NETWORK?CONSIDER THE PHYSICAL TOPOLOGY

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Topology Types:

Topology = The map or plan of the network.

The physical topology describes how the wires or cables are laid out,

and the logical topology describes how the information flows.

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MESH NETWORKS

Partial Mesh

A

B C

D EFull Mesh

A

B C

DE

STAR TOPOLOGY

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BUS TOPOLOGY

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RING TOPOLOGY

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CLASSIFICATION OF NETWORKS BY SIZE AND COMMUNITY

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A company or home A city wide

network A country

wide network

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SINGLE TO MULTIPLE LANS

METROPOLITAN AREA NETWORK

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WIDE AREA NETWORK

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EXAMPLE NETWORK

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modem

modemendoffice

endoffice

Modem = Modulator - DemodulatorCOM port

Copper CableAnalog Signal(voice band)

AsynchronousRS-232CDigital

Inside thePSTN Network

TelephoneExchange

Digital Signal

INTERNET CONNECTIONS

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GlobalBackbone

GW

CampusLAN

ISP GW

Access via PSTN, ADSL or cable

GW

LANLANPrivate

Backbone

University

Large/MediumEnterprise

Access viaLeased Lines(high speed)

WHAT IS THE MODE OF TRANSMISSION FOR COMPONENTS OF A COMPUTER?

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Internal view / External View?Lets use an external view:

Keyboard, mouse, monitor?

Printer port (LPT#)?

Serial port (COM#), modem,USB, LAN (Ethernet)?

Firewire, SCSI, etc?

Sound cards?

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