VMEBus Switched Serial, commonly known asVXS, is anANSI standard (ANSI/VITA 41)[1] that improves the performance of standard parallelVMEbus 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 asPCI Express,RapidIO, StarFabric fromDolphin Interconnect Solutions andInfiniBand) or additional functionality.[2] VXS is backward compatible with VMEBus. It is defined by the VME International Trade Association (VITA) 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 are as follows:
| Basic module | |
|---|---|
| VITA 41.0 | VXS Base Standard - ANSI ratified |
| VITA 41.1 | InfiniBand Protocol on VXS |
| VITA 41.2 | Serial RapidIO Protocol on VXS |
| VITA 41.3 | VXS Ethernet 1000 Mbit/s Baseband IEEE 802.3 Protocol Layer Standard |
| VITA 41.4 | VXS 4X PCI Express Protocol Layer Standard |
| VITA 41.10 | Live Insertion System Requirements for VITA 41 Boards |
| VITA 41.11 | VXS Rear Transition Module Standard |
| General | |
|---|---|
| Standards |
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| Storage |
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| Peripheral | |
| Audio | |
| Portable | |
| Embedded | |
Interfaces are listed by their speed in the (roughly) ascending order, so the interface at the end of each section should be the fastest.  Category | |