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Clarification of index value for transceiver/physical-channels/channel #1225

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proberts2022 opened this issue Nov 15, 2024 · 0 comments
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In openconfig-platform-transceiver.yang, the description of the channel list indicated that "A physical port with a single channel would have a single zero-indexed element"
However, as I understand it, most of the Management Interface Specifications that cover transceivers supporting more than one channel on the media interface use one-based indexing and this holds even in the case of a transceiver with only one channel (e.g. 100GBASE-LR1).
SFF-8436, SFF 8636, CMIS, SFP-DD-MIS use one-based lane references
CFP-MSA-MIS uses zero based lane references

And in practice, it seems the zero-based index within the openconfig model is reserved for digital-coherent-optics where the state of the industry supports only one wavelength on the media interface of the transceiver.

I would suggest the description be changed from
"List of client channels, keyed by index within a physical
client port. A physical port with a single channel would
have a single zero-indexed element";
to
"List of client channels, keyed by index within a physical
client port. For standard optics, one-based indexing is
used. For digital coherent optics, a single channel exists
and uses index zero.";

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