The Cisco ONS 15454 optical filter cards are plug-in modules that take advantage of 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 32 channels, supporting the requirements of service provider and enterprise networks. Table 1 outlines the optical filter plug-in module types available for the Cisco ONS 15454 MSTP with the applications they are designed to support.The Cisco ONS 15454 filter cards are based on the ITU 100-GHz wavelength plan. Each card integrates software-controllable variable optical attenuators (VOAs), providing node- and network-based automatic-power-level management. The optical cards incorporate faceplate-mounted LEDs to provide a quick visual check of the operational status at the card. Printed on each of the faceplates is an icon, an orange circle, which is mapped to shelf-slot icons indicating the shelf slot where the card can be physically installed. The cards are supported by the integrated Cisco ONS 15454 Cisco Transport Controller craft manager, which provides the user access for operations, administration, maintenance, and provisioning (OAM&P) for the system.