Hi Sujan and all,
Regarding your questions
- The AFE noise you considered for calculation is dBm/Hz or dB/Hz?
- The AFE noise is given in dBm/Hz. I did not notice the typo until after I had uploaded the spreadsheet.
- You mentioned ‘EC Connector Cancellation [%] = 100%’, is that corresponds to 5dB EC cancellation you assumed?
- No, the 100% and the 5dB are two separate things. In this model I use separate RL models for connectors and for cable micro reflections. The 100% means that I assume that the connector
echo is completely canceled. The 5dB is the additional echo cancelation of the micro-reflections.
- -40dB micro-reflection is after echo cancellation or before cancellation?
- The -40dB is the micro-reflections before echo cancelation, but excluding the connector echo. The connector echo is created separately.
Please let me know if this answers your questions, or if you would like a more detailed explanation.
Ragnar
From: Sujan Pandey <sujan.pandey@xxxxxxxxxx>
Sent: Thursday, October 29, 2020 4:20 AM
To: STDS-802-3-B10GAUTO@xxxxxxxxxxxxxxxxx
Subject: [EXT] Re: [802.3_B10GAUTO] Question Follow-up - IL limit to achieve 25Gbps over 11m
External Email
Hi Ragnar,
Thank you for sharing the results.
Just quick questions to make sure that we are on same page in terms understanding the number you have shown in the table because I hate guessing them ;-)
-
The AFE noise you considered for calculation is dBm/Hz or dB/Hz?
-
You mentioned ‘EC Connector Cancellation [%] = 100%’, is that corresponds to 5dB EC cancellation you assumed?
-
-40dB micro-reflection is after echo cancellation or before cancellation?
Kind regards,
Sujan
From: Ragnar Jonsson [mailto:rjonsson@xxxxxxxxxxx]
Sent: Wednesday, October 28, 2020 5:33 PM
To: STDS-802-3-B10GAUTO@xxxxxxxxxxxxxxxxx
Subject: [802.3_B10GAUTO] Question Follow-up - IL limit to achieve 25Gbps over 11m
All,
As a follow-up on today’s question about the limit line if we want to achieve 25Gbps over 11 meters, it would depend on the modulation (line code) used. I have enclosed an example for the PAM-4 modulation similar to 802.3ch. In this particular
example I chose to use about 3dB margin. With different modulation (line code) and different margin assumptions we will get slightly different insertion loss requirements. So what I have included in this email, should be considered an example. This is
NOT a formal proposal for what the IL target should be.
Ragnar
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