Francios – did you compare the phase response? That was what tingting mentioned in her email. Sometimes phase responses (particularly at low frequencies) get messed up due to various processing
techniques. These are important for extracting time-domain simulations. They also are a bit tricky to scale properly with length.
From: stds-802-3-spep2p@xxxxxxxxxxxxxxxxx <stds-802-3-spep2p@xxxxxxxxxxxxxxxxx>
On Behalf Of Francois Beauregard
Sent: Tuesday, February 27, 2024 2:06 PM
To: zhangtingting (O) <zhangtingting59@xxxxxxxxxx>; STDS-802-3-SPEP2P@xxxxxxxxxxxxxxxxx
Subject: RE: S parameter for 500m channel
Hello Tingting,
I scaled down the 500m measurements to 100m. The IL was found to be in good agreement with the model proposed by Voss/Wachtel
Regards
Francois Beauregard
From: zhangtingting (O) <00001e92abc91102-dmarc-request@xxxxxxxxxxxxxxxxx>
Sent: Monday, February 19, 2024 8:46 PM
To: STDS-802-3-SPEP2P@xxxxxxxxxxxxxxxxx
Subject: [EXTERNAL] [802.3_SPEP2P] S parameter for 500m channel
External Message:Use caution before opening links or attachments
Hi,
I found that the phase calculated from the real and imag of S21 in the online Excel seems to weird. Besides, the frequency step is 0.125MHz for
frequencies less than 32MHz, and increases to 0.25MHz after 32MHz. If the correct measurement data of 500m channel is not available, LT Spice model has to be used to get S parameters for time domain simulation.
The online presentation associated with the LT Spice model is wrong (incorrect link). Do the inline connectors need to be included for the 500m
channel, or just cascade five 100m segments?
Thanks
Best wishes,
Tingting
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