Asynchronous Transmission 0.0 / 5 ? ElectronicsAsynchronous transmissionparity bitsA2/A-levelWJEC Created by: hollow.jayeCreated on: 01-05-18 09:22 Synchronous data transmission requires: A clock signal and two lines 1 of 11 Asynchronous data transmission requires: Start and Stop bits and 1 line 2 of 11 Advantages and Disadvantages of Synchronous transmission Fast transmission but requires 2 lines 3 of 11 Advantages and Disadvantages of Asynchronous transmission Only 1 line used but slow transmission 4 of 11 What is the purpose of the start and stop bits? To designate the beginning and end of a string of bits 5 of 11 What is the purpose of parity bit(s)? To check that the data has been transmitted correctly 6 of 11 How do Even and Odd parity systems work? The amount of logic 1s are even (even parity) and odd (odd parity) when the data is correct 7 of 11 Issues with parity bits: Longer transmission, sometimes won't detect errors. 8 of 11 How do 2 bit systems work? Each parity bit checks a nibble of data 9 of 11 How do 4 bit systems work? Each parity bit checks 4 bits, with overlap between each parity bit 10 of 11 At what point does error correction become possible? When there is 4 bit or 5 bit parity, it is possible to locate the area where an error occurs. 11 of 11
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