The Cisco ONS 15454 OSC cards are plug-in modules that take advantage of the proven Cisco ONS 15454 carrier-class features to maintain management connectivity for the Cisco ONS 15454 MSTP network.The OSC-CSM card provides an inter-node communications channel for management and user data channel, allowing network level communications to support intelligent DWDM implementation without the use of client transponder data communication overhead. It integrates an optical add/drop filter to remove and add the OSC wavelength while passing the other wavelengths. The OSC-CSM is used in nodes without a booster amplifier or future cross-connect equipped systems.This optical service channel card features an integrated combiner/separator.