• Existing or occurring at the same time
  • Synchronous transmissions is controlled by an external clock
  • Constant/continuous connection
  • Applications such as: Skype, FaceTime, chat rooms, online games use synchronous data transmission
  • Messages flow both ways
  • Two way communication at the same time
  • Continuous – no start and stop bit


  • Controlled by special signals sent along the transmission medium
  • Sent in regular intervals sending data one after another
  • Non continuous data transmission
  • Used by services such as: Email, Snapchat, WhatsApp, SMS messaging, websites
  • Don’t need to establish a connection
  • An event is used to trigger connection and alert the user
  • One way communication
  • Provides you with a higher availability
  • Internet is asynchronous

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