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1.2.(1-3)COMMUNICATION (USB (Benefits and drawbacks (Devices plugged in…
1.2.(1-3)COMMUNICATION
Data Transmission
Data transmission can be either over a short distance (for example, from computer to printer) or over longer distances (for example, over a telephone network).
Essentially, 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):
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Simplex, half duplex and full duplex
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USB
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Operation of USB
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the device is automatically recognised and the appropriate DEVICE DRIVER is loaded up so that computer and device can communicate effectively
if a new device is detected, the computer will look for the device which matches the device. if this is not available the user will be prompted to download it
2 data lines?
• Data is sent over a differential line, which means that D- is a mirror image of D+, so both Data lines carry the signal. The receiver subtracts D- from D+. If there was some noise it would be picked up by both wires, the subtraction will cancel it.
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