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Many articles considered PPP as a byte-oriented, and the others mention it as a bit-oriented.

+----------+----------+----------+----------+------------
       |   Flag   | Address  | Control  | Protocol | Information
       | 01111110 | 11111111 | 00000011 | 16 bits  |      *
       +----------+----------+----------+----------+------------
               ---+----------+----------+-----------------
                  |   FCS    |   Flag   | Inter-frame Fill
                  | 16 bits  | 01111110 | or next Address
               ---+----------+----------+-----------------

I think the frame fields all is in byte format, and it should be clearly byte-oriented.
can anyone say why PPP is byte-oriented as well as bit-oriented?

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The header and everything else in a PPP frame is byte-aligned - and I don't see anything that is bit-oriented.

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