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Posted by Michelot on March 8, 2008, 4:59 pm
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Hi Michelot,
> At the master side, the polynomonial is: 1 + X13 + X33, whereas
> at the slave side, the polynomial is: 1 + X20 + X33.
>
> Is it a question of energy spreading?
I think no. The separare scramblers makes the two opposite streams
more uncorrelated, which helps symbol recovery at the receiving end.
Let's try an example, if it is correct!
The length of the pseudocode is 2v33 = (2v10)v3.3 bits, around 10v10
bits, that's make 10v4 seconds at 1 Gbit/s, that is around 3 hours.
Suppose a transmitting of IDLE. If the scramblers were same, the both
end will transmit the same signal after a period of 3 hours. In this
case, with the echo and crosstalk cancellations, perhaps it should be
difficult to detect a start of MAC frame.
Is it your advice?
Mchelot
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