Re: [10GBT] Channel models

[Sanjay Kasturia <SKasturia@TERANETICS.COM>]

Chris,

 

My requests were driven by requests I had received for:

a) 4x4 or full matrix data so you could actually simulate all the crossterms and hence simulate a system operating over 4 pairs

b) a few other sample measurements so that you get a better representation of the cable plant

 

I have subsequently seen questions on how you scale actual cable measurements to the limit lines - the questions arise specifically when you are dealing with a matrix channel. Do you scale each parameter to the limit line? Do you scale the sum etc.

 

I think Jose Tellado had summarized a few different ways of scaling. If you don't have a summary of what he had summarized, please ask him for it and put it on the reflector.

 

Regards,

 

Sanjay Kasturia

Editor-in-chief, 802.3an

 

sanjay@teranetics.com

cell (650) 704-7686

office (408) 653-2235

 

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From: stds-802-3-10gbt@IEEE.ORG [mailto:stds-802-3-10gbt@IEEE.ORG] On Behalf Of CDimi80749@AOL.COM
Sent: Wednesday, May 12, 2004 12:47 PM
To: STDS-802-3-10GBT@LISTSERV.IEEE.ORG
Subject: Re: [10GBT] Channel models

Sanjay Kasturia had posted a request for additional cabling channel models in an e-mail sent to the 10GBASE-T reflector

4/10/2004 (attached below). I had responded to Sanjay that the TF cabling Adhoc had contributed a set of worst case

models to the TF modeling Adhoc group and requested that Sanjay be more specific on the need for and types

of additional models required

 

I’d like to continue this thread in order solicit input from the TF on the need for additional cabling models in order

to coordinate and focus the cabling adhoc on the deliverables. The TF established a baseline cabling specification

supported by the current set of models. What are the requirements and objectives for additional cabling models?

 

We need to focus on the development of the standard and generate a list of objectives and requirements for

additional channel models that apply to that effort. Towards that end, what are we lacking in channel models??

 

 

Regards,

 

Chris DiMinico

Chair: 10GBASE-T Cabling Ad-hoc

 

 

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

 

sanjay@teranetics.com

cell (650) 704-7686

office (408) 653-2235