A new architecture of optical transport networks which is addressed
in the newest version of G.872 is being developed in ITU-T SG15.
Compared with previous G.872 technology, this new technology allows
the switch of large chunk of contiguous spectrum which may be wider
than the spectrum occupied by a single optical channel signal.
Since current control plane technology isn't able to control this
kind of application, this document describes the signaling extension
to support the control of this kind of new spectrum utilization and
implementation way. This document also addresses the interworking
between WSON optical channel and SSON (Spectrum Switched Optical
Network) optical channel.