Abstract: An electronic equipment module, as well as a system and a method for mounting electronic equipment modules are disclosed, an electronic equipment module is provided as a symmetrical casting. The electronic equipment module includes a first chassis unit which attaches to a second chassis unit. Each chassis unit has a mounting recess adapted to receive one or more circuit assemblies. The mounting recesses can be separated by a cover applied to one unit, the other unit, or both. The module is normally mounted within a unit rack, and thus, can have a removably attachable, and re-orientable keyed surface on its rear face which mates with a corresponding keyed surface on the interior surface of the unit rack. The mounting system includes a mounting frame, a plurality of electronic equipment modules, and a unit rack coupled to at least one of the electronic equipment modules and the mounting frame.