This was a tough custom design. The initial requirement was to fit a chassis to a 21″ telco rack, but have the design be able to also fit a 19″ rack. The motherboard was a massive EATX dual Xeon server class board. Because this was a NEBS certified central office application, the system, including the massive processors, had to be ruggedly constructed to satisfy the seismic requirements of NEBS. Five external NIC connectors had to be available at the front panel.
The resulting design met all the customer requirements. It is NEBS compliant in all regards, fits both 19 and 21 inch racks, and is rugged enough to pass all seismic and transportation spectra when fully populated. Many application specific features were built into the chassis.