This document provides an information model of information needed by the routing and wavelength assignment (RWA) process in wavelength switched optical networks (WSONs). The purpose of information described in this model is to facilitate constrained lightpath computation in WSONs. In particular in cases where there are no or a limited number of wavelength converters available in the WSON. This model currently does not include optical impairments.
This document was split off from an original document that included an RWA information model, encodings for that model and implementation details for use within routing protocols such as GMPLS extended OSPF. This is now a CCAMP working group document.
For extended discussion and examples of WDM switch modeling be sure to read the paper "Modeling WDM Wavelength Switching Systems for use in Automated Path Computation" attached below. Note that drawing detailed diagrams of various WDM switching devices is nearly impossible with ASCII line art as required in Internet Drafts so we've relegated the examples and figures to a separate paper.
We have introduced a representation for wavelength converter pools that may exist in WSON switches. This is a minimal state approximate model. Similar in spirit to the general WSON switch model that is already in the document. A preliminary draft of a tutorial paper with examples can be found in the list of paper at the bottom of this page.