MIL-STD-2119A, MILITARY STANDARD: DESIGN REQUIREMENTS FOR PRINTED-WIRING ELECTRICAL BACKPLANE ASSEMBLIES (08 OCT 1982)., This standard establishes design requirements governing printed-wiring electrical backplane assemblies consisting of rigid printed-wiring boards in accordance with MIL-P-55110 on which separately manufactured connector component parts qualified in accordance with MIL-C-28859 have been added. The design criteria (such as printed-wiring board thickness) contained in this standard are predicated on the requirement that end item assemblies are conformal coated or solder masked.