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
Reply by yanivguy21●May 20, 20152015-05-20
Hi Jean,
do you have an answer?
It doesn't defined well.
Thanks,
YanivG
Reply by jsrolland●May 1, 20062006-05-01
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