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[10GBASE-T] 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.