Re: [10GBASE-T] The channel model
Doug,
ANSI/TIA/EIA-568-B.2-1-2002 -
Addendum 1 – Transmission Performance
Specifications
for 4-pair 100 ohm Category 6 Cabling contains an informative annex (G)
addressing
cable installation in higher temperature environments. Examples of cable length reductions based
on the specified
temperature de-rating are provided in a table.
I'd welcome other
input.
Regards,
Chris
----- Original Message -----
Sent: Wednesday, January 15, 2003 8:13
AM
Subject: Re: [10GBASE-T] The channel
model
>
>
> Chris:
>
> I encourage 10GBASE-T work
to include environmental effects (temperature,
> humidity, etc..) on
transmission performance. ICEA is currently
> investigating
environmental effects on UTP cable based on a request from
> TIA. A
constant benign +23C environment should not be assumed when
> generating
10 Gbe copper cable guidance.
>
> Regards,
>
> Doug
Coleman
> Corning Cable Systems
>
>
>
>
>
Chris
DiMinico
>
<cd@mohawk-cdt.com>
To: Roger Karam <rkaram@cisco.com>
>
Sent
by:
cc: stds-802-3-10gbt@ieee.org, xichen@marvell.com
>
owner-stds-802-3-10gbt@majordom Subject: Re:
[10GBASE-T] The channel
model
>
o.ieee.org
>
>
>
01/14/2003 04:46
PM
>
>
>
>
>
>
>
> 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
> > > >
> > > >
>
> > >
> > > >
> > > >
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> >
> >
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