Re: [10GBT] More on the PAM12 emissions
Hi Sailesh,
I'm glad you're convinced this is no longer an issue. I hope we can
consider the "case of the peaky PSD" closed and move on to more constructive
dialog.
Regards,
- Scott
PS: Please check out the ISO document Alan Flatman gave to the group for a
summary of CISPR emissions requirements - you can also look at the EN55022
emissions standard for ITE for more details.
-----Original Message-----
From: stds-802-3-10gbt@ieee.org [mailto:stds-802-3-10gbt@ieee.org] On Behalf
Of sailesh rao
Sent: Tuesday, July 27, 2004 4:19 AM
To: STDS-802-3-10GBT@listserv.ieee.org
Subject: Re: [10GBT] More on the PAM12 emissions
Scott,
I already stated that I did not consider the specific requirements of the
FCC and CISPR emissions measurements since I didn't have the data on their
requirements.
In general, if you can convince communications experts that sending a fixed
pattern repeatedly is a great idea, then it logically follows that we will
all be throwing away our scramblers, thus setting back the industry at least
fifty years. Besides, I know that this is not a big issue that a simple
scrambler on the fixed pattern cannot easily solve.
Instead of continuing this debate, I would really like to focus on the
bit-to-symbol mapping of the PAM12 system that causes a 0.5dB rise and fall
in its transmit PSD as a function of the THP filter coefficients. There are
technical consequences to this phenomenon that I think needs to be explored.
Regards,
Sailesh Rao.
srao@phyten.com
>From: Scott Powell <spowell@broadcom.com>
>Reply-To: spowell@broadcom.com
>To: STDS-802-3-10GBT@listserv.ieee.org
>Subject: Re: [10GBT] More on the PAM12 emissions
>Date: Mon, 26 Jul 2004 17:29:48 -0700
>
>I thought we were going to keep these discussions technical ...
>
> >>sailesh rao writes: 7/25/2004
> >
> > OK, I agree with you to keep these e-mails technical in order to
> > advance
>the discussion.
> >
>
>Rather than change the subject, I, for one, would also like to see your
>analysis corrected for the errors that were pointed out. Let's settle
>this so called ripple "issue" rather than leave it hanging. If it is a
>problem for some reason not yet shown, there are solutions that can be
>explored. I don't see where these frame sync's are a problem when the
>analysis is done correctly with a 120kHz resolution bandwidth.
>
>Thanks,
> - Scott
>
>Dr. Scott Powell
>Senior Manager, Ethernet PHYs
>Broadcom Corp.
>(949)926-5105
>spowell@broadcom.com
>
>
>
>-----Original Message-----
>From: stds-802-3-10gbt@ieee.org [mailto:stds-802-3-10gbt@ieee.org] On
>Behalf Of sailesh rao
>Sent: Monday, July 26, 2004 4:58 PM
>To: STDS-802-3-10GBT@listserv.ieee.org
>Subject: Re: [10GBT] More on the PAM12 emissions
>
>
>Glenn,
>
>I have a better idea: please withdraw the PAM12 proposal and let us all
>focus on the PAM8 proposal that doesn't have any of these issues.
>
>Regards,
>Sailesh Rao.
>srao@phyten.com
>
> >From: Glenn Golden <gdg@zplane.com>
> >Reply-To: gdg@zplane.com
> >To: STDS-802-3-10GBT@listserv.ieee.org
> >Subject: Re: [10GBT] More on the PAM12 emissions
> >Date: Mon, 26 Jul 2004 17:48:26 -0600
> >
> >sailesh rao writes:
> > >
> > > Same response as to Jose.
> > >
> >
> >I'm sorry Sailesh, I feel that the onus is on you now now. Read my
> >email more carefully and I believe you'll see why your response to
> >Jose is incorrect.
> >
> >
> > > Please go ahead and fix it yourself. Your observations don't
> > > negate the point I've been trying to make for the past three days
> > > - if we keep
> >sending
> > > the same patterns repeatedly as proposed in powell_1_0704.pdf,
> > > spiky
> >stuff
> > > happens in the PSD.
> >
> >Yes, that's right, spikey stuff happens in the PSD. And the peaks of
> >the spikey stuff are 23 dB below the data, where no one doing EMI
> >testing can see them.
> >
> >Please fix the errors we've told you about, set the resolution
> >bandwidth in accordance to the EMI testing standard, and then show us
> >the ripple.
> >
> >- Glenn
>
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