Based on the M-series for Seismic Zone 4 applications, the Mobile cabinet features double-walled extrusions for a rugged, modular design. The unit comes in a stacked formation with 38U on the bottom and a 12U enclosure on the top. Other stacked sizes and options are available. Like the M-series, it meets MIL-STD-810F for shock and vibration and can withstand an earthquake Seismic Zone 4 event as defined in GR-63-CORE. The enclosure also includes EMC shielding. OPTIMA ELECTRONIC PACKAGING SYSTEMS, Lawrenceville, GA. (770) 496-4000.