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What is the efficiency of ascii character using asynchronous data with two stop bits?
Wiki User
∙ 12y ago
The efficiency of ascii characters using asynchronous data transfer protocol with two stop bits is 8 in 11, or 72%.
There is one start bit, eight data bits*, and two stop bits. That is 11 bit cells, in which a payload of 8 bits is possible, hence the 8 in 11.
*Actually there are only 7 data bits in ASCII... latin-1 and several other incompatible extensions to ASCII have 8. Which one is in use varies between languages - many European countries use different encodings which have the same meanings for the first 128 characters but different for the second 128 depending on what extra characters are required in the language in question.
If the payload was 7 bits, for pure ASCII, then the efficiency with one start bit and two stop bits would be 7 in 10, or 70%.
Wiki User
∙ 12y ago
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