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Re: New draft on optical impairments signaling

Hi Giovanni, this looks very interesting. I noticed we both hit some similar issues ( see our draft http://www.ietf.org/internet-drafts/draft-bernstein-ccamp-wson-signaling-00.txt ), i.e., we both think there is a need for modulation type and FEC information. Since, in our draft we weren't looking at impairments we were using these more for end system compatibility and regenerator/wavelength converter compatibility. We looked at these more as "optical traffic parameters" so placed them in a Tspec object and used the attributes stuff for other information associated with wavelength assignment.
I noticed you expressed a concern on the amount of space used per lambda. Isn't it true that for wavelengths close to each other that the impairment (CD, PMD) parameters should be roughly the same so that we could group these with a "wavelength set"? We looked at a bit map encoding of a label set in both http://www.ietf.org/internet-drafts/draft-bernstein-ccamp-wson-signaling-00.txt and http://www.ietf.org/internet-drafts/draft-bernstein-ccamp-wson-info-00.txt such a mechanism could be helpful to reduce the space needed in the messages. 

Regards

Greg B.

Giovanni Martinelli (giomarti) wrote:

Hi all,

we submitted a new draft proposing lightpath setup through signaling
extensions that take into account optical impairments. This allow asses
optical feasibility in the context of wavelength switched optical
networks.

http://www.ietf.org/internet-drafts/draft-martinelli-ccamp-optical-imp-s
ignaling-00.txt

comments/suggestion are highly appreciated!


Regards,
Giovanni 



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Dr Greg Bernstein, Grotto Networking (510) 573-2237