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Asynch and synch transmission
- 1. PRESENTATION BY ATTIPOE GORNI DIVINE
- 2. Chapter Asynchronous and Synchronous Transmission © N. Ganesan, Ph.D. , All rights reserved.
- 3. Chapter Objectives • Explain the features of asynchronous and synchronous transmission and possible areas of application for each transmission type
- 4. Chapter Modules • Asynchronous Transmission • Synchronous Transmission
- 5. Module Asynchronous Transmission © N. Ganesan, Ph.D. , All rights reserved.
- 6. Questions •What is the characterizing feature of asynchronous transmission? • Give some examples of asynchronous transmission • Can asynchronous transmission be conducted at high and low speeds? Give examples in each case
- 7. Asynchronous Transmission • Burst mode transmission • Sender and receiver are not synchronized with respect to the flow of the information • However, the sender and receiver are synchronized with respect to the timing of the characters that are transmitted
- 8. A Note on Asynchronous Transmission • In the past, asynchronous transmission referred only to character by character transmission where each character contained information about timing etc. – Note the use of start and stop bits • At present, the concept of asynchronous transmission can be extended to cover packet transmissions as well
- 9. The Use of the Word Asynchronous • Asynchronous Transmission – Generally refers to the transmission of characters with each character carrying information about timing • Asynchronous Communication – Refers to overall communication between two points •An example in this case would be ATM
- 10. Asynchronous Transmission Applied to Characters Stop Bit Start Bit Character Frame Each character is individually timed.
- 11. Asynchronous Transmission Applied to Packets Burst of Data Packets of data Packets of data A B Intermittent transmission of packets of data
- 12. Analogy Host expecting the arrival of guests Intermittent of burst arrival of guests
- 13. Asynchronous Transmission/Communication Application • Character by character transmission • Data packet transmission at present
- 14. Speed Variations In Asynchronous Transmission • Low and high-speed transmissions are possible • Low speed – Almost all modem based communications fall into this category • High speed – Asynchronous Transfer Mode (ATM) • Internet is a good example where asynchronous communication is used predominantly to carry the information
- 15. Questions •What is the characterizing feature of asynchronous transmission? • Give some examples of asynchronous transmission • Can asynchronous transmission be conducted at high and low speeds? Give examples in each case
- 17. Module Synchronous Transmission © N. Ganesan, Ph.D. , All rights reserved.
- 18. Questions • How does synchronous transmission differ from asynchronous transmission? •Where is synchronous transmission used in practice?
- 19. Synchronous Transmission • Sender and receiver are synchronized with respect to the sending and receiving of information • Each character need not have a start-bit and a stop-bit as the sender and the receiver are both synchronized • Requires more hardware and software resources • High speed communication is the norm
- 20. A Note on Synchronous Transmission • The definition of synchronous transmission refers to the transmission of characters • However, the use of the word synchronous can be extended to cover packet transmission as well
- 21. Usage in Practice •Which one of the two transmissions is used widely in the real world? Explain.
- 22. Examples of Synchronous Transmission • High-speed communication links established using synchronous modems – It is now possible to establish high speed links based on asynchronous transmission • Used in a number of mainframe installations – Collective exchange of information between the mainframe and the peripheral devices is based on synchronous transmission
- 23. In Summary • Synchronous transmission plays a smaller role compared to asynchronous transmission in practice • Implementation of synchronous transmission requires more resources • Asynchronous technology has advanced – It is no more necessary to rely on synchronous communication to establish a high speed communication link