In serial data transmission, every byte of data is padded with a in the beginning and one or two s at the end of byte because:
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Answer: A
This question relates to asynchronous serial data transmission (such as RS-232), where the transmitter and receiver do not share a common clock signal.
To ensure reliable data transfer:
- Start Bit (0): The transmission line is kept at a high state (idle state, represented by '1') when no data is being sent. A transition from high to low ('0') signals the start of a new byte, allowing the receiver to synchronize its internal clock with the incoming data stream.
- Stop Bit(s) (1 or 2): These bits return the transmission line to the high (idle) state, ensuring that the next start bit ('0') will create a clear high-to-low transition to signal the beginning of the subsequent byte.
Thus, these padded bits are used to synchronize the receiver for byte reception.
- Option B is incorrect: Padded bits do not recover lost data bits.
- Option C is incorrect: Parity bits (if used) are separate from start/stop bits and are used specifically for error detection, not synchronization.
Therefore, the correct option is A.
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