Framework and Requirements for GMPLS-Based Control of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) Networks
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To allow efficient allocation of optical spectral bandwidth for
systems that have high bit-rates, the International Telecommunication
Union Telecommunication Standardization Sector (ITU-T) has extended
its Recommendations G.694.1 and G.872 to include a new Dense
Wavelength Division Multiplexing (DWDM) grid by defining a set of
nominal central frequencies, channel spacings, and the concept of the
"frequency slot". In such an environment, a data-plane connection is
switched based on allocated, variable-sized frequency ranges within
the optical spectrum, creating what is known as a flexible grid
(flexi-grid). Given the specific characteristics of flexi-grid
optical networks and their associated technology, this document
defines a framework and the associated control-plane requirements for
the application of the existing GMPLS architecture and control-plane
protocols to the control of flexi-grid DWDM networks. The actual
extensions to the GMPLS protocols will be defined in companion
documents.