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Transmission modes

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  • 1. Data Communication and Networking (DCN) Practical External:-Presentation “Transmission Modes” Submitted To:- “Ms. Mansi Dangarwala” Submitted By:- Manaswi Sharma (185)
  • 2. Data transmission is the physical transfer ofdata (a digital bit stream) over a point-to-point orpoint-to-multipoint communication channel.Communication channel is any physical medialike cables etc.
  • 3.  Transmitted simultaneously on separate wires. Multiple circuits for connection. Devices close to each other. E.g. Data transmission between computer and printer.
  • 4. Advantages of parallel transmission: 1. Time required is only one clock cycle. 2. Clock frequency can be kept low.Disadvantages of parallel transmission: 1. Number of wires. 2. Too many wires.
  • 5.  Transmitted serially on same wire. Requires 1 wire to connect. Close or far doesn‟t create any problem. E.g. Data transmission between computer and computer.
  • 6. Advantages of serial transmission: 1. Only one wire is required. 2. Reduced cost due to less number of conductors.Disadvantages of serial transmission: 1. Speed of data transfer is low. 2. To increase speed of data transfer, clock frequency needs to be increased.
  • 7.  In data communication, Timing control of the reception of bits is important. There are two methods of timing control for reception of bits.
  • 8.  Data bytes transmitted at any instant of time. One byte at a time. Ideal time between two bytes. Different clock frequencies. „start‟ and „stop‟ bits are used. Ideal time is not constant, also known as gaps. Timing of signal is not important.
  • 9. Advantages of asynchronous transmission: 1. Synchronization not necessary. 2. Cheap scheme.Disadvantages of synchronous transmission: 1. „start‟ and „stop‟ bits and gaps makes transmission slow. 2. Timing error.
  • 10.  Carried out under common master clock. Transmitted as a block of bits. Operate at same clock frequencies. No „start‟ and „stop‟ bits required. No gaps between data bytes. Timing of signal is important.
  • 11. Advantages of asynchronous transmission: 1. Speed of data is much. 2. Timing errors are reduced.Disadvantages of synchronous transmission: 1. Data entirely dependent on timing. 2. Devices should be properly synchronized.