computer networks transmission media
TRANSCRIPT
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Telecommunications and Computer Networks
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Agenda
• Purpose of Computer Networking
• Transmission Media
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Communications
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Communications
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The analog signal(audible)
is sent throughtelephone lines.
MODEM MODEM 011010001011010001
Digital signal Digital signal
This modem convertsdigital to analog.
This modem convertsanalog to digital.
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Computer Networking
• Interconnected collection of computers that share data, memory and other valuable resources.
• A computer network consists of communication media, devices and software needed to connect two or more computer systems and/or devices.
• Networks can be used to share hardware, programs and databases across the organization.
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Purpose of networking
• Data communication
• Simultaneous Access
• Resource sharing
• Reliability
• Scalability
• Save money
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The Uses of a Network - Simultaneous Access
• In organizations, many people may need to use the same data or programs
• Shared data and programs can be stored on a central network server
• Managers may assign access rights to users.
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Read/writeRead/writeRead/writeRead/writeRead/writeRead only
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• It is cost-effective to connect a device to a network so users can share it.
• Users can send multiple documents (called print jobs) to a networked printer at the same time.
• E-Mail• Teleconferencing• Video Conferencing
The Uses of a Network -Shared Peripheral Devices
The Uses of a Network - Personal Communication
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1 2 3 4
Email service – process flow
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Transmission Media
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Types of Media
• Twisted-Pair
• Coaxial Cable
• Fiber-Optic Cable
• Microwave Transmission
• Satellite Transmission
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Twisted-Pair
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Twisted-Pair Wire Cable
Advantages
-least expensive
-widely available
-moderate capacity
-easy to install
-transfer 10-100Mbps
Disadvantages
-Slow(low bandwidth), Easily tapped
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Coaxial Cable
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Coaxial Cable
• -moderately expensive• -higher capacity• -bulky• --transfers 1-2 Gbps• -usually used to carry TV signals
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Fiber Optic Cable
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Fiber Optic Cable…
• -very expensive• -high capacity• -uses light• -travels long distance
without attenuation (several Gbps for about 100-200 Km)
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Microwave Transmission
• -Expensive• -Requires no cabling• -best for high volume and long distance• -limited to line of sight• -waves travel in a straight line and
narrowly focused in a parabolic antennae• -can’t penetrate solid objects
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Microwave Transmission
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Satellite Transmission
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Technological Updatesin Information Systems
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Emerging Technologies
• WiFi
• WiMax
• VOIP
• GPS
• RFID
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WiFi
• Wireless Fidelity = wireless LAN
• Wireless Connection to access a Network
• Wireless LAN
• Standard for transmitting information in the form of radio waves over distances up to about 100 - 300 feet
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WiMax
• Worldwide Interoperability Microwave Access = Metro based broadband wireless access
• Longer distance coverage (~50 km)
• Connecting geographically remote areas
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VOIP
• Voice Over Internet Protocol
• VOIP Phones are connected to the internet using n/w cables or WiFi
• Preferred over normal cabled telephone
• Interactive user interface
• Easy connectivity
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VOIP
• Cost Reduction
• Quality
• Parallel calls using same connection
• No limitation on location
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GPS
• Global Positioning System
• Satellite based tracking
• Used for navigation
• Applications:– Fleet Management– Logistics– Asset tracking
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RFID
• Radio Frequency Identification• Transmitting signal over Radio Wave from an
object connected to RFID device to the reader
• Objective is to keep track• Applications :
– Inventory Management– Retail Store– Logistics
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RFID Applications