In J.83-B 256-QAM: Considering the FEC Frame 40-bit frame sync trailer: ---7 1---|---E 8---|---4 D---|---D 4---|-cw- 0--- 0111 0001 1110 1000 0100 1101 1101 0100 xxxx 0000 as defined in Figure B.10/J.83 Suppose the Control Word is 0 for a I = 128 and J = 1. We interpreted the spec so that these are inserted as follow in the 5 last trellis group of a FEC Frame: 2072/2076 2073/2076 2074/2076 2075/2076 2076/2076 ---7 1--- ---E 8--- ---4 D--- ---D 4--- ---0 0--- 0111 0001 1110 1000 0100 1101 1101 0100 0000 0000 S0 = 0 S0 = 1 S0 = 0 S0 = 1 S0 = 0 S1 = 1 S1 = 1 S1 = 1 S1 = 1 S1 = 0 S2 = 1 S2 = 1 S2 = 0 S2 = 0 S2 = 0 S3 = 1 S3 = 0 S3 = 0 S3 = 1 S3 = 0 S4 = 0 S4 = 1 S4 = 1 S4 = 0 S4 = 0 S5 = 0 S5 = 0 S5 = 1 S5 = 1 S5 = 0 S6 = 0 S6 = 0 S6 = 0 S6 = 0 S6 = 0 S7 = 1 S7 = 0 S7 = 1 S7 = 0 S7 = 0 Where the first line is the number of the trellis group in the FEC Frame; The second line the value in hex of the part of the FEC sync trailer in that trellis group, the third line the same value in binary, and the last 8 lines the assigment of these bits in the S0 to S7 locations in the "Sync trellis group bit order" illustrated in figure B.15/J.83 Is this correct ? If it is not correct what is our error ? Jean-Sebastien Rolland
J.83-B 256-QAM
Started by ●May 1, 2006
Reply by ●May 20, 20152015-05-20
Reply by ●May 20, 20152015-05-20
On Wed, 20 May 2015 02:24:22 -0500, yanivguy21 <yanivguy21@hotmail.com> wrote:>Hi Jean, >do you have an answer? >It doesn't defined well. > >Thanks, >YanivG >I think this message didn't go where you think it went. Eric Jacobsen Anchor Hill Communications http://www.anchorhill.com