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TOPIC
Data Communication
3 March
2004
© PETER KOMISARCZUK & VUW, 2004. 2
Group Member
Kaleem ullah
Dilawar Gull
Sufyan Maqsood
. 3
TRANSMISSION MODES
4
Simplex
Half Duplex
Full Duplex
A NETWORK MODEL
5
Source
Transmitter
Carrier
Receiver
Destination
NETWORKS
How do we categorise?Topology, geographyTechnology
GeographicWide area networksMetropolitan networksLocal area networksPersonal networks
TechnologiesCircuit switchedPacket switched
. 6
WHAT'S A NETWORK?CONSIDER THE PHYSICAL TOPOLOGY
7
Point-to-Point Connections:
WHAT'S A NETWORK?CONSIDER THE PHYSICAL TOPOLOGY
8
Point-to-Multipoint Connections:
WHAT'S A NETWORK?CONSIDER THE PHYSICAL TOPOLOGY
9
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.
. 10
MESH NETWORKS
Partial Mesh
A
B C
D EFull Mesh
A
B C
DE
STAR TOPOLOGY
. 11
BUS TOPOLOGY
. 12
RING TOPOLOGY
. 13
CLASSIFICATION OF NETWORKS BY SIZE AND COMMUNITY
14
A company or home A city wide
network A country
wide network
. 15
SINGLE TO MULTIPLE LANS
METROPOLITAN AREA NETWORK
16
WIDE AREA NETWORK
17
EXAMPLE NETWORK
18
modem
modemendoffice
endoffice
Modem = Modulator - DemodulatorCOM port
Copper CableAnalog Signal(voice band)
AsynchronousRS-232CDigital
Inside thePSTN Network
TelephoneExchange
Digital Signal
INTERNET CONNECTIONS
19
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?
20
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?
21