The DoC procedure was implemented to speed class B computers and their peripherals to market. The DoC is a "self-certification" procedure, i.e., no submission of data or fees to FCC, as was required in almost all cases for class B home computer/peripheral equipment prior to DoC rules.
Class A *never* has required submission to FCC, so a class A DoC does not compute, so to speak. FCC class A compliance is and has always been under the Verification program, itself a "self-certification" or "scout's honor" type procedure. Hope this helps. Labelling issues always seem to be in the top 3 categories of faqs. Tom Cokenias RFI/EMC Consultant