Hello Peter,
TCTL vs. ELTCTL
We published TCTL earlier in 2023 because the Insertion Loss of the cable prototype was not smooth above 60 Mhz. I am sorry that we didn’t update the plot with the new 500m test datas. But ELTCTL is more relevant.
TCTL = Scd21(dB)
ELTCTL = Scd21 (dB) – Sdd21 (dB)
Did you mean that it should be valuable to measure S-parameters at different lengths? In order to assess parameters that cannot be assumed linearly scaled with IL?
RL
The measurements were done on a single piece of 500m cable, no connectors. For simulation purpose, we could define typical link configurations and add connectivity impairements.
Francois Beauregard
From: Peter Fischer <p.fischer@xxxxxx>
Sent: Thursday, March 7, 2024 8:54 AM
To: STDS-802-3-SPEP2P@xxxxxxxxxxxxxxxxx
Subject: [EXTERNAL] [802.3_SPEP2P] AW: S parameter for 500m channel
External Message:Use caution before opening links or attachments
Dear François and all
I have few questions:
- Why do you use TCTL instead of ELTCTL? For me scaling is not only related to IL, therefore a 100m measurement for the short link case would be more accurate.
- RL looks for me too good, at least after installation we cannot expect such values.
Best regards
Von: Francois Beauregard <00002cfd85cd2c3d-dmarc-request@xxxxxxxxxxxxxxxxx>
Gesendet: Dienstag, 5. März 2024 17:37
An: STDS-802-3-SPEP2P@xxxxxxxxxxxxxxxxx
Betreff: Re: [802.3_SPEP2P] S parameter for 500m channel
Hello Georges,
These are a new set of S-parameters for 18AWG-500m cable; the phase issue has been corrected by doing interpolation above 32Mhz.
Sdd, Scd, Sdc : S2p touchtone formatted, 125kHz to 100 MHz, step 125kHz
SPE100 : excel format Sdd11, Sdd22, Sdd21, Scd11, Scd22, Scd21, 125kHz to 100MHz, step 125kHz
Regards
Francois Beauregard
From: George Zimmerman <george@xxxxxxxxxxxxxxxxxxxx>
Sent: Tuesday, February 27, 2024 5:22 PM
To: STDS-802-3-SPEP2P@xxxxxxxxxxxxxxxxx
Subject: [EXTERNAL] Re: [802.3_SPEP2P] S parameter for 500m channel
External Message:Use caution before opening links or attachments
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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