RE: PAM-5, what are your BERs ?
Richard:
I agree this is the right sequence to do it. No problem.
Regards,
Edward S. Chang
NetWorth Technologies, Inc.
EChang@xxxxxxxxxxxxxxxx
Tel: (610)292-2870
Fax: (610)292-2872
-----Original Message-----
From: owner-stds-802-3-hssg@xxxxxxxx
[mailto:owner-stds-802-3-hssg@xxxxxxxx]On Behalf Of Rich Taborek
Sent: Thursday, March 02, 2000 6:46 PM
To: HSSG
Subject: Re: PAM-5, what are your BERs ?
Ed,
You may be putting the cart in front of the horse in addressing a weakness
of a
multilevel decoding circut.
I believe that the MultiLevel camp must first reach majority consensus on
the
objectives of a MultiLevel PHY for 10 GbE. These objectives may include
items
such as relative cost to other PMDs, distance support, form factor,
copmatibility with standard interfaces, etc.
Once a common set of objectives is agreed upon AND we've selected a proposal
to
go with, we can start looking at applicable technologies and finially
optimizing
decoder circuits.
If the MultiLevel camp does otherwise, it will ditch itself and by bypassed
by
other PHY proposals with considerably more support.
Best Regards,
Rich
--
Edward Chang wrote:
>
> Richard:
>
> I agree with you, the complex decoding requirements of the multilevel
coding
> causes the poor BER.
>
> Therefore, the solution is obvious, let's improve the decoding technique
to
> lower the BER.
>
> If some one can initiate addressing the weakness of the decoding circuit,
> and providing suggestions to improve it, it will make PAM-5 much more
> attractive to users.
>
> Regards,
>
> Edward S. Chang
> NetWorth Technologies, Inc.
> Plymouth Meeting, PA
> EChang@xxxxxxxxxxxxxxxx
> Tel: (610)292-2870
> Fax: (610)292-2872
>
> -----Original Message-----
> From: owner-stds-802-3-hssg@xxxxxxxx
> [mailto:owner-stds-802-3-hssg@xxxxxxxx]On Behalf Of Rich Taborek
> Sent: Wednesday, March 01, 2000 5:39 PM
> Cc: stds-802-3-hssg@xxxxxxxx
> Subject: Re: PAM-5, what are your BERs ?
>
> Ed,
>
> Bingo!
>
> However, it is not FEC that is t the core of the issue. The real culprit
is
> MultiLevel encoding which may require FEC to achieve technical and
economic
> feasibility as a 10 GbE PHY.
>
> I am very happy to see optical experts like yourself taking a look at how
> different MultiLevel signaling is from traditional binary signaling,
noting
> the
> advantages, and helping to resolve the issues that arise.
>
> Best Regards,
> Rich
>
> --
>
> Edward Chang wrote:
> >
> > Jaime:
> >
> > text deleted...
> >
> > The inclusion of the FEC will bring new issues to the specifications.
> >
> > Of course, those issues can be resolved.
> >
> > Regards,
> >
> > Edward S. Chang
> > NetWorth Technologies, Inc.
> > EChang@xxxxxxxxxxxxxxxx
> > Tel: (610)292-2870
> > Fax: (610)292-2872
> >
> > -----Original Message-----
> > From: owner-stds-802-3-hssg@xxxxxxxx
> > [mailto:owner-stds-802-3-hssg@xxxxxxxx]On Behalf Of Jaime Kardontchik
> > Sent: Wednesday, March 01, 2000 12:59 PM
> > To: stds-802-3-hssg@xxxxxxxx
> > Subject: Re: PAM-5, what are your BERs ?
> >
> > Edward Chang wrote:
> >
> > > Sean:
> > >
> > > Thanks for reminding us FEC.
> > >
> > > The BER defined in the standard is the actual error rate without any
> error
> > > correction. This establishes the fundamental reliability and quality
> > > criteria of components, systems, and technologies.
> > >
> > > The error correction techniques can be added as an option for
> applications
> > > which need better BER than what has been specified in the standard.
> > > However, this is outside of the standard.
> > >
> > > For cost-effectiveness, I believe users will request the specified BER
> in
> > > the standard should be sufficient without added error collection.
> > >
> > >
> > > Edward S. Chang
>
> -----------------------------------------------------
> Richard Taborek Sr. Phone: 408-845-6102
> Chief Technology Officer Cell: 408-832-3957
> nSerial Corporation Fax: 408-845-6114
> 2500-5 Augustine Dr. rtaborek@xxxxxxxxxxx <= NEW!
> Santa Clara, CA 95054 http://www.nSerial.com <= NEW!
-----------------------------------------------------
Richard Taborek Sr. Phone: 408-845-6102
Chief Technology Officer Cell: 408-832-3957
nSerial Corporation Fax: 408-845-6114
2500-5 Augustine Dr. rtaborek@xxxxxxxxxxx <= NEW!
Santa Clara, CA 95054 http://www.nSerial.com <= NEW!