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RE: 10GBASE-R Jitter Pattern Generator - initial value


You are correct. The text was copied from the scrambler (where it doesn't
matter because even if it starts out all zeros the transmitted data will put
1's into the generator). For the jitter test pattern, it should not be
allowed to start at all zeros. Please submit a comment.


-----Original Message-----
From: David Gross [mailto:dgross@xxxxxxxxxxxxxxxxxx]
Sent: Tuesday, February 13, 2001 10:12 AM
To: stds-802-3-hssg@xxxxxxxx
Subject: 10GBASE-R Jitter Pattern Generator - initial value

I just wanted to point out that for figure 49-9 of clause 49.2.8 (Jitter
pattern generator) it is mentioned that "There is no requirement on the
initial value for the PRBS generator". However, if all zeroes is used as
the initial value, the PRBS will remain in a state where it doesn't
change. Thus, I would think that the initial value shouldn't be allowed
to be all zeroes. Any thought?

-Dave Gross