In asynchronous serial data transmission, every byte of data is padded with a…
2002
In asynchronous serial data transmission, every byte of data is padded with a '0' at the beginning and one or two '1's at the end because:
- A.
The receiver is to be synchronized for byte reception
- B.
The receiver recovers lost '0' and '1' bits from these padded bits
- C.
The padded bits are useful in parity computation
- D.
None of these
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Correct answer: A
The correct answer is Option A. In asynchronous serial transmission, the line is normally idle at logic 1. A start bit of 0 tells the receiver that a new byte is beginning, and one or two stop bits of 1 mark the end of that byte and return the line to the idle state. These extra bits allow the receiver to synchronize at byte boundaries. They are not used to recover lost bits or to compute parity.