Re: [10GBASE-T] The channel model
Roger,
TIA requires that measurements be performed on cable samples
removed from the reel or packaging and laid out along a nonconducting
surface, loosely coiled, or supported in aerial spans, with all pairs
terminated.
Modeling applies to this test configuations.
Modeling "coiled" cable is as easy as power supply engineering.
Regards,
Chris
----- Original Message -----
From: "Roger Karam" <rkaram@cisco.com>
To: "Chris DiMinico" <cd@mohawk-cdt.com>
Cc: <stds-802-3-10gbt@ieee.org>; <xichen@marvell.com>
Sent: Tuesday, January 14, 2003 4:18 PM
Subject: Re: [10GBASE-T] The channel model
>
> Hi Chris,
>
> Just how much fun is it to model the coiled and the 'not coiled' cables?
> roger
>
> At 12:38 PM 1/14/2003, Chris DiMinico wrote:
>
> >Xiaopeng,
> >
> >Worst case channel models for category cables are specified in TIA and
ISO
> >cabling standards.
> >Given that one of our objectives is to operate over ISO 11801 cabling we
> >should use the cabling
> >standards (ISO and TIA) channel specifications as our 10GBASE-T model
> >baseline (whenever
> >possible).
> >
> >For 1000BASE-T, the channel models we used in the matlab simulations
> >consisted of measurements
> >(magnitude and phase) of cabling channels scaled to the envelope of the
> >worst case function specified.
> >
> >
> >Regards,
> >
> >Chris
> >
> >
> >
> >----- Original Message -----
> >From: <xichen@marvell.com>
> >To: <stds-802-3-10gbt@ieee.org>
> >Sent: Tuesday, January 14, 2003 2:44 PM
> >Subject: [10GBASE-T] The channel model
> >
> >
> > >
> > > I would like to propose the following channel and noise model. Then
we
> > > can work together to come up with a model that all of us agree on.
> > >
> > > 1. Channel insertion loss model: refer to the RLCG model on page 47
of
> > > T1E1.4/2000-002R6. Then calibrate the insertion loss (100m) at 100MHz
to
> > > 21dB for CAT-6 and 24dB for CAT-5/5E.
> > >
> > > 2. NEXT model: ~f^(1.5)n^(0.6) where n is number of disturbers. In
our
> > > case, n=3. Then calibrate the NEXT at 100MHz to -31dB for CAT-5E
> >and -40dB
> > > for CAT-6.
> > >
> > > 3. ELFEXT model: ~f^(2)n^(0.6) where n is number of disturbers. In
our
> > > case, n=3. Then calibrate the ELFEXT (100m) at 100MHz to -19dB for
CAT-5E
> > > and -24dB for CAT-6.
> > >
> > > 4. ANEXT model:
> > > CAT-5E: max[-65, -38+15log10(f/1e8)] dB
> > > CAT-6: max[-65, -41+15log10(f/1e8)] dB
> > >
> > > 5: Tranformer model: please contribute
> > >
> > > Xiaopeng
> > >
> > >
> > >
> > >
> > >
>
>
>