1.2.1 conceptos previos

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Definiciones basicas en el tema de las redes, descripcion de sus componentes

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1.2.1 conceptos previos

  1. 1. Conceptos PreviosWilliam StallingsData and Computer Communications
  2. 2. A Communications Model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. 3. Simplified CommunicationsModel - Diagram
  4. 4. Key Communications Tasks Transmission System Utilization Interfacing Signal Generation Synchronization Exchange Management Error detection and correction Addressing and routing Recovery Message formatting Security Network Management
  5. 5. Simplified DataCommunications Model
  6. 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
  7. 7. Simplified Network Model
  8. 8. 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)
  9. 9. Circuit SwitchingDedicated communications path established for the duration of the conversatione.g. telephone network
  10. 10. Packet SwitchingData sent out of sequenceSmall chunks (packets) of data at a timePackets passed from node to node between source and destinationUsed for terminal to computer and computer to computer communications
  11. 11. Frame RelayPacket switching systems have large overheads to compensate for errorsModern systems are more reliableErrors can be caught in end systemMost overhead for error control is stripped out
  12. 12. Asynchronous Transfer ModeATMEvolution of frame relayLittle overhead for error controlFixed packet (called cell) lengthAnything from 10Mbps to GbpsConstant data rate using packet switching technique
  13. 13. Integrated Services DigitalNetworkISDNDesigned to replace public telecom systemWide variety of servicesEntirely digital domain
  14. 14. 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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