Rx optical parameters for alignement with 400G-ZR spec.

[sergiobelotti]

As reported here https://github.com/ietf-ccamp-wg/ietf-ccamp-layer0-types-ext/issues/51#issuecomment-1169783555 check have been done in both OpenZR+ and ZR specs on the optical parameters, and for alignment , Tx parameters have been added to the explicit mode list . But we have still RX parameters:

• PMD (avg) tolerance

• Peak PDL tolerance Shall we need to add also these ones to the model? See related Specs. at: OIF-400ZR-01.0_reduced2.pdf openzrplus_1p0.pdf

[sergiobelotti]

weekly call 25 October Gabriele said that the attributes should be added in RFC 9093-bis and then make reference to that in the other document. We decide to reference OIF document in the YANG definition. No other description.

AP @italobusi @sergiobelotti : to introduce the parameters in the next version of the document

[sergiobelotti]

The possible descriptions are: PMD tolerance: Tolerance to PMD with < 0.5 dB . Penalty to OSNR sensitivity Peak PDL tolerance: Tolerance to peak PDL with < 1.3 dB . Penalty to OSNR sensitivity put as reference both : https://github.com/ietf-ccamp-wg/draft-ietf-ccamp-optical-impairment-topology-yang/files/8898693/OIF-400ZR-01.0_reduced2.pdf https://github.com/ietf-ccamp-wg/draft-ietf-ccamp-optical-impairment-topology-yang/files/8898694/openzrplus_1p0.pdf

[italobusi]

While working on a YANG update, Sergio and I have got a doubt about the measurement unit for these two new attributes.

We have checked the measurement units for PMD in L0-Types and optical impairment topology models and found many cases.

In the list polarization-dispersion-penalty the PMD measurement unit is ps:

https://github.com/ietf-ccamp-wg/ietf-ccamp-layer0-types-ext-RFC9093-bis/blob/e2ae8b64e85a5876c2085243a17f183face920b3/ietf-layer0-types.yang#L1313-L1334

In the fiber-params grouping the PMD measurement unitis in sqrt(ps):

https://github.com/ietf-ccamp-wg/draft-ietf-ccamp-optical-impairment-topology-yang/blob/d4d761dcec69cbba8d5492f4dc85e7e7ed91c36d/ietf-optical-impairment-topology.yang#L263-L267

In the roadm-expressgrouping the PMD measurement unit is ps/(km)^0.5:

https://github.com/ietf-ccamp-wg/draft-ietf-ccamp-optical-impairment-topology-yang/blob/d4d761dcec69cbba8d5492f4dc85e7e7ed91c36d/ietf-optical-impairment-topology.yang#L279-L293

In the roadm-add-path grouping the PMD measurement unit is ps:

https://github.com/ietf-ccamp-wg/draft-ietf-ccamp-optical-impairment-topology-yang/blob/d4d761dcec69cbba8d5492f4dc85e7e7ed91c36d/ietf-optical-impairment-topology.yang#L325-L338

In the roadm-drop-path grouping the PMD measurement unit is ps/(km)^0.5:

https://github.com/ietf-ccamp-wg/draft-ietf-ccamp-optical-impairment-topology-yang/blob/d4d761dcec69cbba8d5492f4dc85e7e7ed91c36d/ietf-optical-impairment-topology.yang#L425-L438

[sergiobelotti]

While working on a YANG update, Sergio and I have got a doubt about the measurement unit for these two new attributes.

We have checked the measurement units for PMD in L0-Types and optical impairment topology models and found many cases.

In the list polarization-dispersion-penalty the PMD measurement unit is ps:

https://github.com/ietf-ccamp-wg/ietf-ccamp-layer0-types-ext-RFC9093-bis/blob/e2ae8b64e85a5876c2085243a17f183face920b3/ietf-layer0-types.yang#L1313-L1334

In the fiber-params grouping the PMD measurement unitis in sqrt(ps):

https://github.com/ietf-ccamp-wg/draft-ietf-ccamp-optical-impairment-topology-yang/blob/d4d761dcec69cbba8d5492f4dc85e7e7ed91c36d/ietf-optical-impairment-topology.yang#L263-L267

In the roadm-expressgrouping the PMD measurement unit is ps/(km)^0.5:

https://github.com/ietf-ccamp-wg/draft-ietf-ccamp-optical-impairment-topology-yang/blob/d4d761dcec69cbba8d5492f4dc85e7e7ed91c36d/ietf-optical-impairment-topology.yang#L279-L293

In the roadm-add-path grouping the PMD measurement unit is ps:

https://github.com/ietf-ccamp-wg/draft-ietf-ccamp-optical-impairment-topology-yang/blob/d4d761dcec69cbba8d5492f4dc85e7e7ed91c36d/ietf-optical-impairment-topology.yang#L325-L338

In the roadm-drop-path grouping the PMD measurement unit is ps/(km)^0.5:

https://github.com/ietf-ccamp-wg/draft-ietf-ccamp-optical-impairment-topology-yang/blob/d4d761dcec69cbba8d5492f4dc85e7e7ed91c36d/ietf-optical-impairment-topology.yang#L425-L438

weekly 23-06-27 for the fiber ps is correct or ps/sqrt(km) all the other should be ps

[sergiobelotti]

weekly call 23-06-27

We agree do not add these two attributes since both for PMD and PDL are already covered in the model in the transceivers related attributes with "polarization-dispersion-penalty" and "max-pol-dependent-loss-penalty" So, the issue can be considered closed.