Liaison statement
WSON work in Q12/15

State Posted
Posted Date 2008-10-06
From Group ITU-T-SG-15
From Contact Greg Jones
To Group ccamp
To Contacts
Response Contact
Technical Contact
Purpose For information
Attachments WSON work in Q12/15 - body text in pdf
Thank you for your liaison statement of September 6, 2008 to Q3/15 regarding
the OTN work plan advising us of your work on Wavelength Switched Optical
Networks (WSON).
Q.12/15 has initiated work on developing a network model for WSON, we will be
working in cooperation with Q.6/15 to include optical impairments in this
model.  One intended output of this work is a model that can be used for path
computation in the presence of both optical impairments and blocking switches.
 We note that the aspects related to optical impairments are quite challenging
and we are engaging the appropriate experts.  In view of this we would
encourage you to continue your focus on networks in which impairments can be
neglected and only wavelength assignment needs to be considered.
We noted that you are considering the use of a matrix to represent the
blocking characteristics of an asymmetrical switch (e.g. ROADM).  We are
considering the use of a bipartite graph since it appears to be suitable for
path computation.
We will review the internet drafts that you reference and would be obliged if
you kept us informed of your progress on work in this area.
An electronic copy of this liaison statement is available at: