Data Communication: Definitions, Network Types and Topologies, Slides of Data Communication Systems and Computer Networks

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Data Communication

Today’s Lecture

• Definitions
• Network Topologies

4

Networks

• Network
  • Interconnection of two computers forms a network
• Networks Categories
  • Geographical Classification
    • LANs
    • MAN
    • WANs
    • Global Area Network
      • Topological Classification
        • Point to Point Networks
        • Broadcast Networks
        • Switched Networks
      • Special Networks
        • Personal Area Networks
        • Storage Area Networks

5

Geographical Classification

• LANs
  • Usually confines to a building or small office
  • Usually low cost networks, major role is sharing of resources
  • The network in DCIS labs
• MANs
  • Spread over an area from 1 to 30 km usually contains more than one LANS
  • e.g. DCIS LAB connected to Head Quarter network
• WANs
  • Spread over an area from 30 km to world wide e.g. internet
• Global Area Networks
  • Spread over unlimited geographical area, WAN Interconnection

7

• Broadcast Message Types
  • There three different types of messages
    • Uni-cast message
    • Multicast message
    • Broadcast message
• Bus , Ring, Satellite systems are broadcast networks
• Switched Networks
• Circuit switched network.
• Packet switched network.

8

Special Networks

• Personal Area Network
  • A small home based network used to interconnect home devices.
  • A technique used to transfer data between two persons when they physically contact each other. Also termed as near field intra body communication
  • PAN uses nano amp current passed through human body to transfer data, three major application of PAN are - Transfer data between electronic devices carried by the two person e.g. electronic card - Transfer personal data between personal devices like mobile phone or pager carried by the two persons - Secure transaction by PAN sensors
  • Example
    • A Personal ATM card
    • Personal Computer etc

10

Start Network (hub based)

• Hub’s Operation

11

Start Network (switch based)

• Operation of a switch

13

Start Ring

• A simple token ring network using concentrator