Re: [802.3_ISAAC] [Return Loss] Cable channel IL and RL limits
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- Subject: Re: [802.3_ISAAC] [Return Loss] Cable channel IL and RL limits
- From: Conrad Zerna <conrad@xxxxxxxxxxxxxx>
- Date: Wed, 22 Jan 2025 22:04:46 +0000
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- Reply-to: Conrad Zerna <conrad@xxxxxxxxxxxxxx>
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- Thread-topic: [Return Loss] Cable channel IL and RL limits
Hi Alireza,
I believe, this was already discussed before: this return loss result is due to all cable lengths being multiples of 1 meter.
It can be easily avoided to drive up the peaks in the RL by imposing a limitation on the segment lengths combinations at virtually no cost to the cable harness. If you do this, there are no limit violations.
Thanks,
Conrad
From: Alireza Razavi <arazavimajom@xxxxxxxxxxx>
Sent: Wednesday, January 22, 2025 10:37 PM
To: STDS-802-3-ISAAC@xxxxxxxxxxxxxxxxx
Subject: [802.3_ISAAC] [Return Loss] Cable channel IL and RL limits
CAUTION: This email is from an external origin!
Hi all,
I am sending this email to elaborate more on my comment in the meeting. I don't believe the ASA limit for return loss is the appropriate limit. In the presentation by Ramanjit Ahuja from November 2024, measurements of four cables showed violations of the ASA limit line in high frequencies.
I've included one of these measurements below for reference.
https://www.ieee802.org/3/dm/public/1124/ahuja_8023dm_01e_11112024_poorreturnloss_equalization.pdf
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