Frame

[Вячеслав Фридель]

Dear CSP community Hello,

I am new to CSP, I'm trying to figure out the frame structure. I found the header of the CSP version 2.0 on github . https://github.com/CodeAboveDev/libcsp/blob/develop/doc/CSP%202.0%20Specification%20-%20Ark1.pdf.
Who can explain how the header differs from the extended header? And what do the ports of the source of the sender of flags of source port  of the destination of the destination port consist of?

I have read many articles about the CSP, but nowhere was it said about the frame structure.