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RE: (SSIG) Taking the winning route


For 850 nm applications using MM fibers, there are many options for 10 GbE.

For fiber types, there are installed 62.5/50 um fibers, and the new improved
62.5/50 um fibers.

For network configurations, there are 3.125 Gbps (8B/10B) 4-bit, 2.5 Gbps
(PAM-5) 4-bit, and 10 Gbps serial.

Based on my previous presentation, and the data available from the new
fibers, with quick estimation (New fiber data are not final, estimated. I
posted for discussion only)

Therefore, there are many options:

			Installed				New Improved
			(Optimum Launch)
			62.5 um	50 um			62.5 um		50 um

2.5 Gbps/4-bit	300 m		300 m			400 meter		800 meter(?)

3.125 Gbps/4-bit	170 meter	200 meter		300 meter		600 meter (?)

10.Gbps serial	 <100meter  <100 meter		100 meter (?)	200 meter (?)

We can expand them with more vigorous tests.


Edward S. Chang
NetWorth Technologies, Inc.
Tel: (610)292-2870
Fax: (610)292-2872

-----Original Message-----
From: owner-stds-802-3-hssg@xxxxxxxx

g@xxxxxxxx]On Behalf Of Andreas Bechtolsheim
Sent: Friday, April 07, 2000 9:40 AM
To: nuss@xxxxxxxxxx; pkolesar@xxxxxxxxxx
Cc: stds-802-3-hssg@xxxxxxxx
Subject: Re: (SSIG) Taking the winning route

850nm VCSELs for 10 GE require customers to deploy new high-bandwdith MMF.
I would recommend that PMD solutions are based on installed base MMF or SMF.

Specifying a PMD that implies a brand new MMF infrastructure is not
consistent with the goal of using existing technology wherever possible.

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Of all the MM-fiber PMD proposals, only the 850nm serial VCSEL solution over
new high-performance fibers has so far been shown to work under stressed
conditions, with Bit Error Rate measurements and careful analysis of the
impairments to support that, and working with VCSELs from many vendors.
suggestions below are highly puzzling to me...


Rich Taborek wrote:
> Vipul, Rob,
> It should be pointed out that a Serial 850nm solution only partially meets
> HSSG distance/cable plant objective: 300m on MMF. However, this MMF must
be the
> new, enhanced MMF. The Serial 850nmsolution addresses no SMF objectives
> WWDM meets all HSSG MMF objectives as well as SMF objectives to 10km.
> I agree with Vipul's choice of 3 PMDs as the best possible PMD set to
> HSSG HSSG distance/cable plant objectives.
> Best Regards,
> Rich
> --
> Vipul Bhatt wrote:
> >
> > Rob,
> >
> > Rob Marsland wrote:
> > >
> > > Finally, I hate to be annoying, but this is the SERIAL sig.  Since
when is
> > > WWDM a serial solution?
> > >
> >
> > There is nothing annoying about your question. I should answer. I
believe it
> > is in our (the Serial SIG's) best interest to rise above our Serial
focus and
> > recognize that an "all Serial" set of solutions that meets all the
> > objectives is not something our customers are willing to sign up for. By
> > proposing a set of three solutions - two of which are Serial - I am
> > a set that has the highest chance of being accepted by our customers and
> > majority of 802.3ae members. I understand you disagree, and I respect
> > opinion.
> >
> > Vipul
> -------------------------------------------------------
> Richard Taborek Sr.                 Phone: 408-845-6102
> Chief Technology Officer             Cell: 408-832-3957
> nSerial Corporation                   Fax: 408-845-6114
> 2500-5 Augustine Dr.        mailto:rtaborek@xxxxxxxxxxx
> Santa Clara, CA 95054  

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