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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 -----
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
> > > >
> > > >
> > > >
> > > >
> > > >
> >
> >
> >
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