Liaison statement
WSON work in Q12/15

Submission date 2008-10-06
From ITU-T SG 15 (Greg Jones)
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: