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03 - Start and Stop bits in asynchronous transmiss

 1. Asynchronous transmission is a method of transferring data that has control signals embedded in it in order to synchronise the transmission.

  TRUE

  FALSE

 2. In Asynchronous transmission the transmitter's and receiver's clocks are kept synchronised right from the start and only become out of sync during transmission.

  FALSE

  TRUE

 3. Start and stop bits are used as ____________ to indicate where the message starts and where it ends.

  loops

  search indexes

  stopping conditions

  markers

 4. Before a message is sent, a _____________________ is added to the message.

  serial stop bit

  serial and parallel control bit

  parallel transmission protocol

  start and stop bit

 5. Start and stop bits are essentially used to _____________________________________________

  distinguish between different types of data (e.g. images or text

  indicate when the message should have a full stop

  synchronise the data transfer between the two devices

  search for lost packets or data within the transmission media

 6. It is not necessary for both devices to send and receive signals at the same rate, as being out of sync in asynchronous transmission is the norm.

  FALSE

  TRUE

 7. An example would be that the bit string: 00101111001 would have the stop bit 0 and a start bit of 1 added to it giving: 0 00101111001 1

  TRUE

  FALSE

 8. Start bit synchronises receiver (clock) (to transmitter/data). It also locks receiver and transmitter in phase and starts receiver's clock or _________________

  kills the receiver

  wakes receiver

  sets the receiver to 0 (e.g off)

  blocks the receiver for security purposes

 9. Stop bit allows start bit to be recognised and it allows the receiver to ____________________

  set a stop bit to 0 (e.g. off)

  process received bits

  block received bits

  find a start bit to begin the next process

 10. In Asynchronous transmission the sender and receiver are only synchronized when data is being sent

  TRUE

  FALSE