The Cisco® ONS 15454 Multiservice Transport Platform (MSTP) provides a comprehensive, intelligent dense wavelength-division multiplexing (DWDM) solution for expanding metropolitan (metro) and regional bandwidth. Release 8.0 expands Cisco ONS 15454 MSTP transport capacity in C band to 40 channels (100-GHz spacing) and to 80 channels (50-GHz spacing). In parallel with the existing 32-channel Reconfigurable Optical Add/Drop Multiplexing (ROADM) solutions, a new set of units is introduced in this release to enhance reconfigurability options for the MSTP platform, allowing multidegree reconfigurability as well. By making use of the Release 8.0 MSTP features and configuration flexibility, a Cisco DWDM network can scale to 112 channels of composite DWDM traffic, using both the C band and the L band spectrum. The new 40-channel Wavelength Cross-Connect (40-WXC) card and the software functionalities extended from previous releases provide multidegree switching capabilities at the individual wavelength level. Mesh and multiring network topologies can now be deployed using Cisco ONS 15454 MSTP platform with complete flexibility of service routing at all nodes in the network. While Wavelength Selective Switch (WSS) units provide degree-2 type reconfigurability (drop wavelength in a node vs. let it pass through the node), an ROADM node based on 40-WXC units can support up to degree-8 reconfigurability. This means that for each wavelength it is possible to decide if it has to be locally dropped or routed to any of the other 7 pass-through directions of the node. Such a capability not only enhances the flexibility of the DWDM transport network but also dramatically reduces the need for costly transponders to perform optical-to-electrical-to-optical conversion (typically 2 transponders/crossponders per add/drop channel or wavelength). This capability allows carriers to more cost-effectively (from both a CapEx and OpEx perspective) build secure and efficient transport networks that can scale with their growing bandwidth and interconnect needs. The Cisco approach to DWDM gives carriers the freedom to reevaluate and alter their wavelength forecasts as service demands grow and business concentrations emerge-without suffering the heavy price typically associated with redesigning and mapping DWDM networks. As even in complex mesh network topologies it is likely that degree-2 reconfigurability would be enough for most of the node, the 40-channel ROADM portfolio includes also two different versions of the 40-WSS units, one operating on the odd channels of the C band spectrum (40-WSS-C) and the other one operating on the even channels of the C band spectrum (40-WSS-CE). The units can be used in conjunction with existing 32-channel ROADM solutions and with 40-WXC units to provide the greatest degree of flexibility for Cisco ONS 15454 MSTP deployments. The Cisco ONS 15454 ROADM cards are plug-in modules that use the proven Cisco ONS 15454 carrier-class features to deliver the flexibility to access network bandwidth from a single DWDM channel all the way to 112 channels, to support the requirements of service provider and enterprise networks.

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