Optical Network Control
Multi-wavelength optical network architecture and control standards have evolved significantly
over the last decade, paving the way for improved vendor interoperability and
???intelligent on-demand??? provisioning [7]. From the ITU-T side, a comprehensive optical
transport network (OTN) architecture has been defined based on a three-layer transport
hierarchy comprising optical channel (OCh), optical multiplex (OMS), and optical
transport (OTS) sections. Associated frame structures and bit-rate hierarchies for mapping
a host of client protocols (native formats) are also defined. Within this framework,
G.8070 (formerly G.astn) defines the requirements for an Automatic Switched Transport
Network (ASTN) via a set of functions for connection setup/takedown. Meanwhile, the
reference architecture for supporting ASTN control is given in G.8080 (formerly G.ason),
which details a distributed client-server setup along with its associated components and
interactions. In particular, G.8080 identifies hierarchical distributed routing and signaling
setups. However the ASON framework does not define specific control protocols for
optical networks.
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