Changes of string in 17677: `Bit stuffing` reserves the `01111110` bit string as the frame boundary marker and ensures that there will never be six consecutive `1` symbols transmitted by the physical layer inside a frame. With bit stuffing, a frame is sent as follows. First, the sender transmits the marker, i.e. `01111110`. Then, it sends all the bits of the frame and inserts an additional bit set to `0` after each sequence of five consecutive `1` bits. This ensures that the sent frame never contains a sequence of six consecutive bits set to `1`. As a consequence, the marker pattern cannot appear inside the frame sent. The marker is also sent to mark the end of the frame. The receiver performs the opposite to decode a received frame. It first detects the beginning of the frame thanks to the `01111110` marker. Then, it processes the received bits and counts the number of consecutive bits set to `1`. If a `0` follows five consecutive bits set to `1`, this bit is removed since it was inserted by the sender. If a `1` follows five consecutive bits sets to `1`, it indicates a marker if it is followed by a bit set to `0`. The table below illustrates the application of bit stuffing to some frames. @ Weblate

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`Bit stuffing` reserves the `01111110` bit string as the frame boundary marker and ensures that there will never be six consecutive `1` symbols transmitted by the physical layer inside a frame. With bit stuffing, a frame is sent as follows. First, the sender transmits the marker, i.e. `01111110`. Then, it sends all the bits of the frame and inserts an additional bit set to `0` after each sequence of five consecutive `1` bits. This ensures that the sent frame never contains a sequence of six consecutive bits set to `1`. As a consequence, the marker pattern cannot appear inside the frame sent. The marker is also sent to mark the end of the frame. The receiver performs the opposite to decode a received frame. It first detects the beginning of the frame thanks to the `01111110` marker. Then, it processes the received bits and counts the number of consecutive bits set to `1`. If a `0` follows five consecutive bits set to `1`, this bit is removed since it was inserted by the sender. If a `1` follows five consecutive bits sets to `1`, it indicates a marker if it is followed by a bit set to `0`. The table below illustrates the application of bit stuffing to some frames.

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