RE: PAM-5, what are your BERs ?
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
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