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

Hi Jean,
do you have an answer?
It doesn't defined well.

Thanks,
YanivG

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