Optical service channel (OSC) cards provide bidirectional channels that connect all the ONS 15454 SDH DWDM nodes and transport general-purpose information without affecting the client traffic. ONS 15454 SDH optical service channel cards include the Optical Service Channel Module (OSCM), and the Optical Service Channel and Combiner/Separator Module (OSC-CSM). The OSC-CSM and OSCM cards have the following subtabs:
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