Re: [10GMMF] TP3 3-impulse test slides

[Paul Kolesar <PKOLESAR@xxxxxxxxxxxx>]

Ben and others,
I am curious why the 3-impulse waveforms
do not include a case where the impulse of maximal excitation changes position.
 In all cases the side impulses remain below the center impulse.  The
explanation may have something to do with the purpose of the test.  But
I see no physical reason why the peak amplitude could not shift positions
within the transmitted bit.  

Regards,
Paul Kolesar
SYSTIMAX® SOLUTIONS
1300 East Lookout Drive 
Richardson, TX 75082 
Phone:  972.792.3155
Fax:      972.792.3111
eMail:   pkolesar@systimax.com

Bottacchi.external@INFINEON.COM Sent by: owner-stds-802-3-10gmmf@IEEE.ORG 09/08/2004 04:24 AM Please respond to "IEEE P802.3aq 10GBASE-LRM"

To:        STDS-802-3-10GMMF@listserv.ieee.org         cc:        (bcc: Paul F Kolesar/CommScope)         Subject:        Re: [10GMMF] TP3 3-impulse test slides

Hello Nick, Bill,

Thank you for your interesting contribution. Sorry for not attending
yesterday call but I was flying...
Few comments:
1 -     I agree on the proposed investigation on slide 2. The
intention
is to design the three pulse test in order to create a worst case ISI
but still reasonable and compliant with Cam results on their fiber
database
2 -     According to PIE-L and PIE-D the calculated curves are
symmetrical respect to pre/post cursor balance. This is true for FFE but
it is not for DFE. How should those curves change (becoming
asymmetrical) due to MMSE FFE+DFE architecture?
3 -     Looking at slide 4 the interesting combination would
be unity
spacing (1.0 UI) with 1/2-1-1/2 pre/post cursor balance and with
a=0.7~0.8. This would lead to about 5 dB optical penalty.

Best regards

Stefano

-----Original Message-----
From: owner-stds-802-3-10gmmf@IEEE.ORG
[mailto:owner-stds-802-3-10gmmf@IEEE.ORG] On Behalf Of Ben Willcocks
Sent: Dienstag, 7. September 2004 17:42
To: STDS-802-3-10GMMF@listserv.ieee.org
Subject: [10GMMF] TP3 3-impulse test slides


Slides for today's meeting attached.