Internetworking with the intelligent optical layer

1.A. Traditional Optical Transport Network View The provisioning of high-speed bandwidth within the traditional optical transport network (OTN) is basically static, an approach that is referred to as the provisioned bandwidth service (PBS) business model. For network operators it is a slow and painstaking operation that requires considerable manual configuration and, in many cases, forces a costly redesign of optical network internals. In the PBS model, electrical devices such as Internet Protocol (IP) routers are connected to optical networks by standard OC-n/STM-n interfaces (STM, synchronous transfer mode). In general the control plane of the traditional OTN is implemented by centralized operation systems and manually intensive procedures. This approach has the following limitations: