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RE: [10GBASE-T] RE: CIR estimation


Thanks for quick response. Your answers are quite clear. Could you please
introduce full clarity into my second  question.

snip"1. For computer simulations, try a long FIR filter."snip -  O.K. We
make impulse response models in a similar manner.

snip "2. Different twisted pairs in the cable will have different delay
characteristics."snip - It means that responses of Wire Line on slide 25 and
FEXT on slide 28 were given for different twisted pairs (say for different
lengths) as examples only. 
      Is this correct?

Thank you in advance,  Victor.

-----Original Message-----
From: William Jones []
Sent: Tuesday, January 28, 2003 12:10 AM
To: Ermolayev, Viktor;
Cc: George Zimmerman
Subject: [10GBASE-T] RE: CIR estimation


Your questions were not completely clear.  Here are the answers based on my
interpretation.  Feel free to follow up if I answered the wrong question.

1. For computer simulations, try a long FIR filter.

2. Different twisted pairs in the cable will have different delay

Slide 10 of the tutorial at the November meeting is the measured frequency
response of the coupling functions. 


William W. Jones, Ph.D.
Director of Systems Engineering
SolarFlare Communications, Inc.
949-581-6830, ext. 2550
mobile: 619-405-2445
fax: 949-581-4695

-----Original Message-----
From: Ermolayev, Viktor []
Sent: Monday, January 27, 2003 5:14 AM
Cc: George Zimmerman; William Jones
Subject: CIR estimation

I wish great successes to all participants of Reflector.

The team from Intel (N.Novgorod, Russia) was subscribed
stds-802-3-10GBT-Modeling. We are going to make MatLab simulation of 10Gb/s
system as full as possible. We think this system should be provided the
channel estimates more widely than previous one. We have to estimate all
channel impulse responses (CIR). We have studied the presentation by George
Zimmerman and Bill Jones and found the examples of Wire line, Echo, Next and
Fext CIRs. Arising questions are:

1.How can we make Next model, which has such a large delay spread ?
2.Why is the Fext front delay less than Wire line delay? 

We have also the question regarding slide 10. Is frequency response or
interference signal spectrum shown on this slide in form of fast oscillating
Thank you in advance.

Victor on behalf of team.