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[EFM] RE: [EFM-Copper] Copper schedule in LAX (and beyond...)


Current NEXT and FEXT models are based on measurements
by a large number of groups, but do not take into account the
high-frequency effects in those existing measurements.  In attempt
to aid the progress, there is a contribution in Los Angeles (will
be presented by Stanford PhD student Jeannie Fang) that provides
an augmentation to those models that could serve as an intermediate
step.  It fits measurements reasonable well and reduces to the old
models when high-frequencies are not used.  This was posted to
the exploder about 1 month ago with only positive feedback so far.

Hopefully this can help with 802.3's diligence in doing a good job while
moving at pace consistent with opportunity and market.


John Cioffi

At 11:09 AM 10/16/2001 -0400, Stanley, Patrick wrote:

>I agree. You bring up a good point. As I state in my presentation that I
>will make this week, the NEXT and FEXT models currently used in the
>standards are based on a large number of measurements (>90,000). Reproducing
>this level of measurement in order to replace the models is a substantial
>amount of work, and could slow down development of the standard.
>-----Original Message-----
>From: Vladimir Oksman [mailto:oksman@xxxxxxxxxxxx]
>Sent: Tuesday, October 16, 2001 10:32 AM
>To: Behrooz Rezvani
>Cc: 'Hugh Barrass'; 'Howard Frazier';;
>Subject: Re: [EFM-Copper] Copper schedule in LAX (and beyond...)
>      I think it is definitely a good idea to make a complete investigation
>the loop plants, crosstalk coupling models and noise sources all over the
>However, it seems to me that we couldn't complete this huge work not even to
>02, but even to Nov 03 on one hand, and, on the other hand, even Nov 02
>too late. It actually targets us for a decisions regarding duplexing and
>modulation technique to the middle of 2003 and for equipment, accordingly,
>the middle 2004! I am not sure many people are looking for this long
>       My view is, we can start right now from public networks, which are
>well known and specified, add all the available data on loops inside big
>buildings and take this package as a primary environment to target EFM.
>on, as different new environments will show a good business case, we just
>them to the existing models and improve the spec.
>Behrooz Rezvani wrote:
> > Hugh and Howard, All,
> >
> > Sorry that I have to leave Thurs afternoon for Stanford Conference on
> > Copper, but here are some thoughts:
> >
> > one of the areas that I am interested to focus on is first and for most
> > simulation environment. We have had couple of conference call on this
> > subject in the past two months and we have made good progress.
> >
> > Here is the summary of what is needed (from everybody) and I certainly
> > to see good contributions as I am trying to put EFM data rate analysis
> > document together:
> >
> > We agreed we need to break copper loops in to two areas:
> > Public Plant/Network and MxU Network
> > We are collecting input right now and two groups are working together to
> > this in to play:
> >
> > The first Item that we like to address is public loop plants. We hope to
> > have an early draft document in Austin to discuss this. Hopefully by
> > interim meeting we can close this! OK may be.
> >
> > Next we like to have an early draft of MxU loop plants in the presence or
> > absence of public loops. This is a new area to everybody. It include
> > such as cable models, interaction of different cable types, etc. Based the
> > early work that we are reviewing we like to close this by March or May
> > frame (:))
> >
> > Next topic is modeling of all noise sources interferences and inclusion of
> > all noise sources. A lot of Next and Fext models don't work very well.
> > is important because we need more upstream bandwidth. Spectral
> > and Dynamic spectral Compatibility, stationary noise and non-stationary
> > noise models are mostly new work that needs to be taken in to account. I
> > really wish that we might get a handle of that and get some sense of it by
> > May 02, may be even Nov 02.
> >
> > This is the ground work that we need to do allow simulation to be
> > fairly. The plan is to use as much work that is done by ANSI, ETSI and
> > ITU-T. I have been in touch with various group in these organization to
> > their participation here at EFM and we could all benefit from that.
> >
> > Thanks
> > Behrooz
> >
> > -----Original Message-----
> > From: Hugh Barrass [mailto:hbarrass@xxxxxxxxx]
> > Sent: Friday, October 12, 2001 11:12 AM
> > To:
> > Cc:
> > Subject: [EFM-Copper] Copper schedule in LAX (and beyond...)
> >
> > All,
> >
> > First of all, I would like to apologize to all those who received two
> > of this
> > e-mail. If you are interested in the copper track and didn't receive two
> > copies then
> > you need to register for the copper mailing list.
> >
> > If you are not interested in the copper track then stop reading here...
> >
> > Follow this link to read instructions for the mailing lists.
> >
> >
> >
> > Finally, the payload data....
> >
> > In LAX we will have 1.5 days of meetings to ourselves. The EPON people
> > leave us
> > alone and we can concentrate on Resistance, Inductance, Current Density
> > other
> > concepts which would otherwise upset the optical folk. Currently we have
> > presentations submitted covering rate and reach; theoretical analysis; PMD
> > proposals;
> > general requirements and 1 new objective. My estimate is that we will
> > comfortably
> > cover these presentations on Wednesday afternoon and Thursday morning -
> > leaving
> > Thursday afternoon for free-range discussions before we rejoin the group
> > Friday
> > morning.
> >
> > I would like to use this "spare time" to (pre) discuss the new objective
> > the
> > simulation / test ad hoc. I would also like to allow some time for a
> > breakout to
> > discuss rate mechanism / operation (as I mention in my recap presentation)
> > and any
> > other (copper) business.
> >
> > Time is very short, so it will be hard to prepare for the Austin Plenary.
> > suggest
> > that we use the spare time and gaps to work towards the baseline
> > presentations that
> > will be needed in November. This means that you should all be trying to
> > out like
> > minded people and sharing your ideas for November presentations.
> >
> > I will send a copy of my recap presentation on the copper reflector - it
> > will also go
> > onto the website.
> >
> > Hugh.

John M. Cioffi
363 Packard Electrical Engineering Bldg.
350 Serra Mall
Stanford, CA 94305-9515
+1-650-723-2150  Fax: +1-650-724-3652