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Re: [10GBT] Channel models

Sanjay,
 
The cabling ad hoc presented measurement data to the study
group consisting of measurements on Category 6 and Category 5e.
The 10GBASE-T  cabling models were selected from the measurement
data and scaled to the worst case limit. The cabling models were provided to the
10GBASE-T modeling ad hoc (Chair: William Jones: wjones@solarflare.com). These models are
utilized in the 10GBASE-T modeling code.
 
I believe we have the measurement data you are requesting. Are you recommending that we
generate a new set of worst case models from the measurement data? If not, can you be more specific
on the need for and types of additional models required.  
 
Measurement Data (Please find details below):
 
Chris DiMinico
Chair: 10GBASE-T Cabling ad hoc
 
 
Cabling ad hoc measurement topologies:
--------------------------------------------------------------------------------------------------
The topologies consisted of 100 meter Class E and Class D channels.
Connectors were added incrementally starting with a baseline 90 meter cable.
++Cable only
++two connectors
++three Connectors
++four connectors
 
Measurement Data:
---------------------------------------------------------------------
Insertion Loss (4 for each configuration) (16 total)
Return Loss (4 for each configuration) (16 total)
NEXT (6 for each configuration) (24 total)
FEXT(ELFEXT) (6 for each configuration) (24 total)
 
Measurement data was provided by the participating companies.
 - Nordx/CDT
- Panduit Corporation
- Siemon Company
- SolarFlare Communications
 
 
In a message dated 4/10/2004 1:19:36 PM Eastern Standard Time, SKasturia@TERANETICS.COM writes:
We have four channel models defined from the March 2004 plenary meeting.
 
For detailed phy performance simulations, we will need sample channel data that complies with these models.
 
We will greatly appreciate it if any task force participants can provide full matrix (4x4) channel data. This would ideally include:
a) Insertion loss data on each of four pairs - real and imaginary
b) Near end crosstalk coupling (6 unique pair-combinations) - real and imaginary
c) Far end crosstalk coupling (6 unique pair-combinations) - real and imaginary
d) Four unique echo transfer functions (one for each pair) - real and imaginary
 
This can be obtained by measurements on actual cable and then scaling to meet the specified channel models.
Any cable companies volunteering to provide this data?
 
There is some data from the cabling Ad-hoc available on: http://www.ieee802.org/3/an/public/material/index.html
This data has some of the items listed above but not all. It does, however, provide enough to get some sense of performance.
 
Sanjay Kasturia
 
cell (650) 704-7686
office (408) 653-2235