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Understanding BIPs (bit-interleaved parity) in SDH

Understanding BIPs (bit-interleaved parity) in SDH

(OP)
I have a problem with understanding B1, B2 and B3 bytes.

The biggest problem: how is the calculation for each byte made.

As I realised, for:
   B1 - all bits of the previous STM-N frame after it has been scrambled
   B2 - bytes are calculated prior to scrambling, but exclude the Regenerator Section Overhead bytes
   B3 - provide an error-monitoring function for Path data including the payload and the Path Overhead POH; B3 specifically does not include either the RSOH or the MSOH in its calculation which is made prior to scrambling

If B1 and B2 statements are correct, there is no problem because I clearly understand those.
The main problem is B3, because I don't understand is it calculated over all bytes of Synchronous Payload Envelope (each byte after Transport overhead (byte>12 for STM1) for each row in previous frame), or over previous Floating Payload including Path OverHead (in that case, it should include bytes placed in H3 when pointer decrements and exclude bytes after H3 when pointer decrements).

Thanks in advance.

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