Dcn notea unit 1 ppt
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IEC-802 : DATA COMMUNICATION NETWORK
Unit-1Basic concepts And ISO-OSI-Model
QAZI SAEED AHMADASSISTANT PROFESSORDEPARTMENT OF ELECTRONICS & COMMUNICATIN ENGINEERINGINTEGRAL UNIVERSITY LUCKNOW
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A Communication Network
• Source– generates data to be transmitted
• Transmitter– Converts data into transmittable signals
• Transmission System– Carries data
• Receiver– Converts received signal into data
• Destination– Takes incoming data
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Communications Tasks
Transmission system utilization Addressing
Interfacing Routing
Signal generation Recovery
Synchronization Message formatting
Exchange management Security
Error detection and correction Network management
Flow control
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Simplified Communications Model - Diagram
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Simplified Data Communications Model
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Networking
• Point to point communication not usually practical– Devices are too far apart– Large set of devices would need impractical
number of connections• Solution is a communications network
– Wide Area Network (WAN)– Local Area Network (LAN)
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Wide Area Networks
• Large geographical area• Crossing public rights of way• Rely in part on common carrier circuits• Alternative technologies
– Circuit switching– Packet switching– Frame relay– Asynchronous Transfer Mode (ATM)
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Local Area Networks
• Smaller scope– Building or small campus
• Usually owned by same organization as attached devices
• Data rates much higher• Usually broadcast systems• Now some switched systems and ATM are
being introduced
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LAN Configurations
• Switched– Switched Ethernet
• May be single or multiple switches– ATM LAN– Fibre Channel
• Wireless– Mobility– Ease of installation
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Metropolitan Area Networks
• MAN• Middle ground between LAN and WAN• Private or public network• High speed• Large area
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NetworkingConfiguration
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Line Configuration
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Point-to-Point Line Configuration
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Multipoint Line Configuration
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Network Topology
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Mesh Topology
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Mesh Topology
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Star Topology
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Tree Topology
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Ring Topology
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Hybrid Topology
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Transmission modes
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Simplex
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Half-Duplex
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Full-Duplex
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ISO-OSI Model
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OOO OSI MODEL
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OSI LAYERS
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An Exchange using OSI Model
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Physical Layer
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Duties
• 1. Physical Characteristics of Interfaces and Medium
• 2. Representation of Bits• 3. Data Rate• 4. Synchronization of Bits• 5. Line Configuration• 6. Physical Topology• 7. Transmission Mode
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Data Link Layer
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Duties
• 1. Framing• 2. Physical Addressing• 3. Flow Control• 4. Error Control• 5. Access Control
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Data Link Layer example
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Network Layer
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Duties
• 1. Logical Addressing• 2. Routing
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Transport Layer
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Duties
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Network Layer Example
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Transport Layer
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WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Session Layer
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Presentation Layer
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Application Layer
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Summary of Layer Functions
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Thank You