VME-bus switched serial is the new ANSI / VITA 41 standard which combines the 32-bit parallel VME-bus with high speed switched serial interconnect fabrics in order to increase the data transfer bandwidth to several GB/s.

VXS defines an interconnected network (fabric) of switched serial input and output ports with point-to-point connection with differential signals.

An active switching device manages data transfers from inputs to outputs. For VXS all active switching devices are located on a special switch card. Depending on the VXS backplane size and configuration one or two switch card slots may be used.  All other modules that connect to the switch cards are called payload cards.

A VXS compliant chassis can have one or two switch cards which have point-to-point connections to all payload cards. and allow all or a subset of the payload boards connected to it to intercommunicate.

A 19″ sub rack can hold a backplane with a maximum configuration of 18 payload slots and 2 switch slots. Backplanes with fewer payload or switch slots are allowed and can be configured in different topologies.

VXS also has increased allowed maximum currents for the 96 pin & 160 pin DIN/IEC connectors from the original 1A to 2A per pin. This allows higher crate power supply currents, and consequently higher power dissipation on the VXS boards which will be needed to fully utilize the high-performance switch fabric capabilities.

This requires a better-designed chassis with improved ventilation that can adequately cool the higher power VXS boards. All WIENER VXS crates can provide maximum DC power and are outfitted with high efficiency temperature controlled and monitored cooling fans.

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