Liaison statement
WSON Impairment Work in CCAMP

The CCAMP Working Group of IETF thanks Question 12 for their liaison from the
September 2008 meeting informing of their initiation of work to be done in
cooperation with Question 6 on developing a network model for WSON which will
include optical impairments. We would like to inform you of our progress in
this area as documented in the CCAMP document "A Framework for the Control of
Wavelength Switched Optical Networks (WSON) with Impairments":
http://www.ietf.org/id/draft-ietf-ccamp-wson-impairments-00.txt

This document provides a framework for GMPLS protocols and mechanisms to
support impairment aware routing and wavelength assignment. The deployment
scenarios are based on the categories discussed at Question 6's Sunnyvale
meeting:
http://ifa.itu.int/t/2009/sg15/exchange/wp2/q6/Meetings/2009-03-Sunnyvale/Contributions/WD6-38.doc

We would appreciate your consideration of this document in your work and would
you please inform us of the scope of your work and the timelines. For CCAMP's
impairment work, CCAMP is focused on scenarios where approximated impairment
estimation using ITU-T defined parameters and approximation techniques (G.680)
may be used. The objective of CCAMP work is to distribute the information which
is needed to allow path computation and signaling of new paths. We would
appreciate your input on the parameter information which is needed to be
distributed by a control plane, to be used by either a node for internal path
computation or a Path Computation Element, and its properties, so as to
understand the control plane distribution requirements. In addition, we would
appreciate your perspective on control plane modeling and implications with
regard to ITU-T's G.872 OTN aspects e.g. OTN multi-layers (OTS, OMS, OCh),
regenerators, and o/e/o (OCh, OTU, ODU).

Best Regards,

Lou Berger and Deborah Brungard
IETF CCAMP Working Group Co-Chairs