200Bd/1000 FSK Rus-Intel 288-bit (aka Enigma F06x) transfers with a slightly different pattern, although all recognized by Rivet [1]. Each frame starts with a 32-bit (4 bytes) sync sequence 0x7D12B0E6
10111110010010000000110101100111
followed by a 11-bit frame line counter (block index). The sync sequence could be generated by the polynomial x^5 + x^4 + x^3 + X + 1.
More and accurate details here.
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