Re: [802.3_100GCU] Updated Minutes

[Chris Cole <chris.cole@xxxxxxxxxxx>]

Hi Chris

 

Our work is complementary to the detailed measurement based analysis using actual impairment data such as in your presentations, or that of others. We are developing first principle models for gaining insight into modulation SNR performance. This was inspired by the work of Joel and Beth in developing first principle models for gaining insight into channel performance.

 

Chris

 

From: CDimi80749@xxxxxxx [mailto:CDimi80749@xxxxxxx]
Sent: Tuesday, February 07, 2012 7:10 PM
To: Chris Cole; STDS-802-3-100GCU@xxxxxxxxxxxxxxxxx
Cc: gzimmerman11@xxxxxxx
Subject: Re: [802.3_100GCU] Updated Minutes

 

Chris,

 

Thanks......

 

Please see attached example of the measurement based analysis I was suggesting in [http://www.ieee802.org/3/hssg/public/nov06/diminico_02_1106.pdf] using

the impairments of the channels under consideration.  Further, in [http://www.ieee802.org/3/hssg/public/sept07/diminico_01_0907.pdf] I created analysis results tables (slide 14 and slide 15) rather than graphs.

 

Regards, Chris DiMinico

 

 

 

In a message dated 2/7/2012 5:33:18 P.M. Eastern Standard Time, chris.cole@xxxxxxxxxxx writes:

At the Interim Meeting, during the Q&A session after our presentation (http://www.ieee802.org/3/bj/public/jan12/cole_02a_0112.pdf), Chris DiMinico suggested that we extend our analysis to include skin loss effects.

Since the result leads to interesting observations, we would like to share these with the Task Force.

 

The Salz SNR bound as a function of dielectric loss from the presentation is:

 

SNR = rho – ½ * IL(NRZ Nyquist)                 (for NRZ)

 

SNR = rho – ¼ * IL(NRZ Nyquist)                 (for PAM-4)

 

The newly derived Salz SNR bound as a function of skin loss is:

 

SNR = rho – 2/3 * IL(NRZ Nyquist)                      (for NRZ)

 

SNR = rho – sqrt(2)/3 * IL(NRZ Nyquist)          (for PAM-4)

 

On the enclosed graph, we plotted the Delta Salz SNR = PAM-4_Salz_SNR – NRZ_Salz_SNR - 7dB.

 

Positive Delta means PAM-4 BER is higher and negative Delta means NRZ BER is higher.

 

Since loss is caused by both contributors, the actual Delta lies somewhere in between the two plotted curves.

 

Notice how even for such a simple model, the cross-over point between the modulation schemes can shift by 8dB just by varying the ratio of channel loss contributors.

 

Chris & Ilya

 

 

From: John D'Ambrosia [mailto:jdambrosia@xxxxxxxxxxxxxxx]
Sent: Monday, February 06, 2012 12:44 PM
To: STDS-802-3-100GCU@xxxxxxxxxxxxxxxxx
Subject: [802.3_100GCU] Updated Minutes

 

All,

There were some modifications made to the minutes.  Please see the latest update at http://www.ieee802.org/3/bj/public/jan12/minutes_01a_0112_unapproved.pdf.

 

John