This ppt is brief description about basic concepts of data communication network.

1. IEC-802 : DATA COMMUNICATION NETWORK
Unit-1
Basic concepts And ISO-OSI-Model
QAZI SAEED AHMAD
ASSISTANT PROFESSOR
DEPARTMENT OF ELECTRONICS &
COMMUNICATIN ENGINEERING
INTEGRAL UNIVERSITY LUCKNOW

2. 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

3. 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

4. Simplified Communications Model -
Diagram

5. Simplified Data Communications Model

6. 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)

7. 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)

8. 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

9. LAN Configurations
• Switched
– Switched Ethernet
• May be single or multiple switches
– ATM LAN
– Fibre Channel
• Wireless
– Mobility
– Ease of installation

10. Metropolitan Area Networks
• MAN
• Middle ground between LAN and WAN
• Private or public network
• High speed
• Large area

11. Networking
Configuration

12. Line Configuration

13. Point-to-Point Line Configuration

14. Multipoint Line Configuration

15. Network Topology

16. Mesh Topology

17. Mesh Topology

18. Star Topology

19. Tree Topology

20. Ring Topology

21. Hybrid Topology

22. Transmission modes

23. Simplex

24. Half-Duplex

25. Full-Duplex

26. ISO-OSI Model

27. OOO OSI MODEL

28. OSI LAYERS

29. An Exchange using OSI Model

30. Physical Layer

31. 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

32. Data Link Layer

33. Duties
• 1. Framing
• 2. Physical Addressing
• 3. Flow Control
• 4. Error Control
• 5. Access Control

34. Data Link Layer example

35. Network Layer

36. Duties
• 1. Logical Addressing
• 2. Routing

37. Transport Layer

38. Duties

39. Network Layer Example

40. Transport Layer

41. WCB/McGraw-Hill © The McGraw-Hill Companies, Inc., 1998
Session Layer

42. Presentation Layer

43. Application Layer

44. Summary of Layer Functions

45. Thank You