The OSC-CSM card has three sets of optical ports and one Ethernet port located on the faceplate..The OSC-CSM is identical to the OSCM, but also contains a combiner and separator module in addition to the OSC module.The OSC-CSM is used in unamplified nodes. This means that the booster amplifier with the OSC wavelength combiner and separator is not required for OSC-CSM operation. The OSC-CSM can be installed in Slots 1 to 6 and 12 to 17 when the ONS 15454 is configured in a DWDM network.