The document discusses Alcatel-Lucent's proposal for implementing Converged Backbone Transformation (CBT) networks using MPLS/DWDM technology. CBT networks integrate IP and optical network layers to reduce costs and complexity while improving scalability, efficiency, and service delivery. Key elements of CBT include IP/optical integration using technologies like OTN, sub-port grooming, and control/management plane integration to provide end-to-end visibility and coordination across network domains. CBT networks are presented as enabling more cost-effective scaling to support growing traffic demands like video.