RE: [10GBASE-T] The channel model
Doug,
As stated in all PHY's for 802.3 now (see Clause 40.9.3.2) and in the future, "Specific requirements and values for environmental conditions are considered to be beyond the scope of this standard."
As such temperature and humidity conditions will not be included in a standard.
Terry
-----Original Message-----
From: Doug.Coleman@corning.com [mailto:Doug.Coleman@corning.com]
Sent: Wednesday, January 15, 2003 8:37 AM
To: Chris DiMinico
Cc: owner-stds-802-3-10gbt@majordomo.ieee.org; Roger Karam;
stds-802-3-10gbt@ieee.org; xichen@marvell.com
Subject: Re: [10GBASE-T] The channel model
Chris:
Attached is the TIA letter to ICEA justifying the need for the
environmental study of UTP. An ICEA WG has been formed to address the
request.
(See attached file:
TR42_2002-06-047a_Liaison_Letter_to_ICEA_on_Environmentals.doc)
Regards,
Doug
Chris DiMinico
<cd@mohawk-cdt.com> To: Doug.Coleman@corning.com
Sent by: cc: owner-stds-802-3-10gbt@majordomo.ieee.org, Roger Karam
owner-stds-802-3-10gbt@majordom <rkaram@cisco.com>, stds-802-3-10gbt@ieee.org, xichen@marvell.com
o.ieee.org Subject: Re: [10GBASE-T] The channel model
01/15/2003 09:13 AM
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 -----
From: <Doug.Coleman@corning.com>
To: "Chris DiMinico" <cd@mohawk-cdt.com>
Cc: <owner-stds-802-3-10gbt@majordomo.ieee.org>; "Roger Karam" <
rkaram@cisco.com>; <stds-802-3-10gbt@ieee.org>; <xichen@marvell.com>
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
> > > >
> > > >
> > > >
> > > >
> > > >
> >
> >
> >
>
>
>
>
>
>
>