Flashcards
Data Transmissions
Cards in this deck (11)
- 1Transmitted;the direction of the data transmission
The method of transmission (how many bits are sent at the same time)
The method of synchronisation between two devices. - 2Simplex dataSimplex data transmission is in one direction only ands thatis printer or scanner.
- 3Half-duplexHalf-duplex transmission is in both directions but not at the same time. Can be used for texts and walkie talkie.
- 4Full duplexFull duplex data transmission is in both directions simultaneously. Phone call.
- 5Data transmissionData transmission can be either over a short distance, for example, from computer to printer and over longer distances such as over a telephone network.
- 6Essentially, three factors need to be considered when transmitting data, each factor has to be agreed by both sender and receiver for this to work without error: The direction of the data transmission (i.e. in one direction only or in both directions) The method of transmission (how many bits are sent at the same time) The method of synchronisation between the two devices.Red Line – Simplex
Blue Line – ½ Duplex
Green Line – Full Duplex - 7Asynchronous & SynchronousAsynchronous data transmission refers to data being transmitted in an agreed bit pattern.
Data bits (1s and 0s) are grouped together and sent with control bits
Synchronous data transmission is a continuous stream of data.
The data is accompanied by timing signals generated by an internal clock. This ensures that the sender and receiver are synchronised with each other.
The receiver counts how many bits (1s and 0s) were sent and then reassembles them into bytes of data.
The timing must be very accurate here since there are no control bits sent in this type of data transmission. - 8serial transmission is one bit a timeDevices that use serial; data transmission are mice, and modems.
- 9Features of serial data transmissions are: data is transmitted one bit at a time over a single cable Cable is therefore cheaper and serial - one line transmission can be used over long distancesParallel transmission sends 8 bits at a time
Examples:
printer
scanner
webcam
microphone - 10Feature of parralel dtSpeed-bits are sent in parallel so more bits are sent at one time
Cable length-cross talk (interference) can corrupt the data
Less complexity-it is easier to add this technology. - 11NEED FOR CHECKING ERRORSChecking for errors is important since computers aren’t able to check that text is correct; they can only recognise whether a word is in their built-in dictionary or not.
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- Flashcards on Data Transmissions, created by Shaaumiga Sivasathiy on 16/10/2015.
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- Shaaumiga Sivasathiy
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