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What's the actual meaning of Vcm-DC?

Other Parts Discussed in Thread: CDCM6208

Hello, I find a strange description about CDCM6208's output----Vcm-DC couple. 

LVPECL:

CML:

LVDS:

What's the actual meaning of Vcm-DC?

I want to know the actual model schemetic in the test condition about the output ways( LVEPCL, CML, LVDS),Thank you.