VXS

Backplane with VXS connectors (black)

VMEBus Switched Serial, commonly known as VXS, is an ANSI standard (ANSI/VITA 41)^[1] 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.^[2] VXS is backward compatible with VMEBus. It is defined by the VITA (VME International Trade Association) working group.

Specification

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:

	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

References

Technical and de facto standards for wired computer buses

General	System bus Front-side bus Back-side bus Daisy chain Control bus Address bus Bus contention Network on a chip Plug and play List of bus bandwidths

Standards	SS-50 bus S-100 bus Unibus VAXBI MBus STD Bus SMBus Q-Bus Europe Card Bus ISA STEbus Zorro II Zorro III CAMAC FASTBUS LPC HP Precision Bus EISA VME VXI VXS NuBus TURBOchannel MCA SBus VLB PCI PXI HP GSC bus CoreConnect InfiniBand UPA PCI Extended (PCI-X) AGP PCI Express (PCIe) Direct Media Interface (DMI) RapidIO Intel QuickPath Interconnect HyperTransport

Storage	ST-506 ESDI SMD Parallel ATA (PATA) SSA DSSI HIPPI Serial ATA (SATA) eSATA eSATAp mSATA SCSI Parallel SCSI SAS Fibre Channel SATA Express M.2

Peripheral	Apple Desktop Bus HIL MIDI Multibus RS-232 RS-422 RS-423 RS-485 DMX512-A IEEE-488 (GPIB) IEEE-1284 (parallel port) UNI/O ACCESS.bus 1-Wire D²B I²C SPI Parallel SCSI Profibus USB IEEE 1394 (FireWire) Camera Link External PCIe Thunderbolt

Audio	ADAT Lightpipe AES3 Intel HD Audio I²S MADI McASP S/PDIF TOSLINK

Portable	PC Card ExpressCard

Embedded	Multidrop bus AMBA Wishbone

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

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