[802.3_COM] RLM

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[802.3_COM] RLM

To: STDS-802-3-COM@xxxxxxxxxxxxxxxxx

Subject: [802.3_COM] RLM

From: Richard Mellitz <000014533bad0b9c-dmarc-request@xxxxxxxxxxxxxxxxx>

Date: Wed, 26 Mar 2025 21:51:43 +0000

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Reply-to: Richard Mellitz <Richard.Mellitz@xxxxxxxxxx>

Thread-index: AduelUOkPEIApQJHQVS7GIDUtQtneQ==

Thread-topic: RLM

Hi all,

I was looking at adjusting the symbol alphabet used to compute COM ISI, crosstalk, and jitter for R_LM. Presently we just use a mean shift in the eye levels by scaling As by R_LM.

The symbol alphabet used in COM PAM4 is presently [ -1 -1/3 1/3 1] or 2*(0:L-1)/(L-1)-1.

I think the symbol alphabet for pam4 would be [-1 -.35 .35 1] for R_LM= 0.95 or in general scale level 1 and L-1 by 2-R_LM for PAML.

The last time I tried this the impact on COM was small (< 0.1 dB). It could be more important for higher PAM.

This has been suggested to mebefore.

Thoughts?

… Rich

Richard Mellitz, Signal Integrity (SI) Engineer

Samtec Southeast

Office: 803-908-4411

www.samtec.com

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Re: [802.3_COM] RLM
- From: Bill Kirkland