RE: [1904.4 TF] Action item #10 discussion

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Hi Marek,

Regarding your last bullet, the ONU receiver specifications in 802.3ca do include the signal detection threshold values, just like the OLT receiver does. See tables 141-21 and 141-22

The main reason why the optical protection was listed as the big ticket item is that we now have multiple channels. We need to make decisions on the following questions:

1) What happens when only one of two channels detects LoS (switching, no switching?).

· Trunk protection, ONU detected LoS on one of two channels

· Trunk protection, OLT detected LoS on one of two channels

· Tree protection, ONU detected LoS on one of two channels

· Tree protection, OLT detected LoS on one of two channels

Note that 802.3ca CCP includes a message designed to inform the OLT of a channel failure at the ONU

2) Do we define a 2-to-1 tree protection method where we have two primary channels, but only a single backup channel?

Is this in the tomorrow’s consensus call agenda or the next week?

Glen

From: Marek Hajduczenia <mxhajduczenia@xxxxxxxxx>
Sent: Wednesday, April 13, 2022 8:13 AM
To: STDS-1904-4-TF@xxxxxxxxxxxxxxxxx
Subject: [1904.4 TF] Action item #10 discussion

Good morning, 1904.4 TF members,

Per discussion on the call last night, I started looking at subclause 9.3 protection to see what needs to change to accommodate Nx25G-EPON protection. I made a few changes tracked in the attached document, mostly to fix any issues identified in the document (editorial) as well as align with the IEEE Std 802.3ca text as published.

Below is the outline of my major changes / observations

- Most (if not all) Clause 9 cross references are broken. It seems that the 2016 edition of 1904.1 was broken during the publication process, where cross-references cannot be automatically updated any more. This also resulted in one of tree protection schemes becoming unassociated with any profile in 1904.1. In 1904.4, I suggest that section to be altogether deleted, since it was originally associated with Profile B in 1904.1.

- I updated MPCP primitives to match definitions provided in 802.3ca – I believe this will make the text cleaner.

- There is no Signal Detect Threshold defined for ONU receivers in 802.3ca – I assume we will just drop the Optical LoS tracking requirement for the ONU side, since we do not have now anything to point back to in the physical layer spec.

Please let me know if there is anything unclear. As it is, I believe subclause 9.3 could be mostly reused with minimum development effort, but requiring the multi-channel Nx25G-EPON system to behave as a single wavelength system.

Regards

Marek

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