VMEBus Switched Serial, commonly known as VXS, is an ANSI standard (ANSI/VITA 41) 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.n) define extensions which use specific serial fabrics (such as PCI Express, RapidIO, StarFabric and InfiniBand) or additional functionality. VXS is backward compatible with VMEBus. It is defined by the VITA (VME International Trade Association) working group.
In common with other similar standards, VXS comprises a ‘base line’ specification, which defines the basic mechanical and electrical elements of VXS, together with a series of ‘dot level’ specifications, one or more of which must be implemented to create a functional module. The specifications and their current status are as follows:
VXS Base Standard - ANSI ratified
InfiniBand Protocol on VXS
Serial RapidIO Protocol on VXS
VXS Ethernet 1000 Mbit/s Baseband IEEE 802.3 Protocol Layer Standard
VXS 4X PCI Express® Protocol Layer Standard
Live Insertion System Requirements for VITA 41 Boards