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Communications Systems
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],5 Basic Components Communications Systems
 
 
Sender transmitted Data is transmitted, on a single channel, one bit at a time one after another - Much faster than parallel because of way bits processed (e.g. USB and SATA drives) Receiver received Serial Transmission 1 0 1 0 0 1 1 0
Receiver received ,[object Object],[object Object],Parallel Transmission Sender transmitted All bits are sent simultaneously 1 0 0 1 1 0 0 1
Why Not use Parallel Instead of serial? ,[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Synchronous  Vs  Asynchronous Transmissions
Start and Stop Bits ,[object Object],Framing ASCII ‘A’ (41H) LSB MSB
Data Transfer Rate ,[object Object],[object Object],[object Object]
-  simplex: One direction only   Transmission Direction
Half Duplex Transmission ,[object Object]
Full Duplex Transmission ,[object Object]
Computer Networks and Topologies
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],What is a Network?
A bus is a form of Ethernet. Nodes linked by a cable known as the bus. Bus transmits in both directions and uses CSMA/CD protocol BUS TOPOLOGY Advantages - Easy to set up and maintain failure of one node does not affect network ,[object Object],[object Object],[object Object]
 
Ethernet ,[object Object],[object Object],[object Object],[object Object],[object Object]
Uses an empty data packet called a token and a special protocol called “token ring”. Packets travel around the ring in a clockwise direction. Clients require an empty token to transmit data. Advantages - no collisions  because all data travels in same direction. Disadvantages - fails if an individual node in the network fails Ring Topology
All data is sent from one client to another through the server. Advantages - If one client fails no other clients are affected. Disadvantages - If central file server fails the network fails. Star Topology

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Data communication basics

  • 2.
  • 3.  
  • 4.  
  • 5. Sender transmitted Data is transmitted, on a single channel, one bit at a time one after another - Much faster than parallel because of way bits processed (e.g. USB and SATA drives) Receiver received Serial Transmission 1 0 1 0 0 1 1 0
  • 6.
  • 7.
  • 8.
  • 9.
  • 10.
  • 11. - simplex: One direction only Transmission Direction
  • 12.
  • 13.
  • 14. Computer Networks and Topologies
  • 15.
  • 16.
  • 17.  
  • 18.
  • 19. Uses an empty data packet called a token and a special protocol called “token ring”. Packets travel around the ring in a clockwise direction. Clients require an empty token to transmit data. Advantages - no collisions because all data travels in same direction. Disadvantages - fails if an individual node in the network fails Ring Topology
  • 20. All data is sent from one client to another through the server. Advantages - If one client fails no other clients are affected. Disadvantages - If central file server fails the network fails. Star Topology

Editor's Notes

  1. Easy to add extra computers . If computer goes down it doesn’t affect rest of network