abstract:VMEBus Switched Serial, commonly known as VXS, is an ANSI standard (ANSI/VITA 41)Frequently Asked Questions on VXS that improves the performance of standard parallel VMEbus by enhancing it to support newer switched serial fabrics. the base specification (ANSI 41) defines all common elements of the standard, while "dot"-specifications (ANSI 41.
If this sounds familiar to you, it's because the VX uses the same pyramid-like structure as the Windows Phone 8X and Droid DNA. Essentially, the reason for the back cover is to tuck away the micro-SIM and microSD slots and minimize the clutter on the outside of the phone.