VME extenders and VXI extenders are boards used to improve or extend the functionality of the standard VME / VXI cards, respectively. There are many types of VME extenders and VXI extenders available. The most common include test extenders, hot swap extenders, and form factor extenders.
Test VME extenders and VXI extenders are cards designed to bring a circuit board completely out of the chassis, the card cage, or the enclosure in order to perform tests on it or to debug it. These extenders also referred to as passive extenders, substantially increase available testing space.
VME extenders and VXI extenders are boards used to improve or extend the functionality of the standard VME / VXI cards, respectively. There are many types of VME extenders and VXI extenders available. The most common include test extenders, hot swap extenders, and form factor extenders.
Test VME extenders and VXI extenders are cards designed to bring a circuit board completely out of the chassis, the card cage, or the enclosure in order to perform tests on it or to debug it. These extenders also referred to as passive extenders, substantially increase available testing space.
Hot swap extenders allow a standard VME / VXI cards to be inserted and removed from a working VME / VXI system without disturbing the normal operation, and without damaging the system or the board. “Hot swapping” refers to the process of removing the card from the system without having to shut it down. The benefits of this are obvious in terms of preventing the loss of productive time, and the extra time spent rebooting and reconfiguring the system once it is turned back on.
Form factor extenders allow boards of different depths to be used in the same depth card cage or chassis. For example a 60 mm board fitted with a 160 mm form factor extender will plug into a system designed for 220 mm deep boards.
VMEbus (Versa Module Europa) is a fast, flexible, open-ended bus system that uses the Eurocard standard. A consortium including Motorola, Phillips, Thomson, and Mostek developed it in 1981. The VMEbus supports a variety of computing tasks in industrial applications. It is defined by the IEEE 1014-1987 standard. VMEbus supports many specialized applications and industries, including: Industrial controls, military, aerospace, telecommunications, medical, etc.
VXI (VMEbus eXtensions for Instrumentation) is a platform created in 1987 by National Instruments and a Consortium of other companies in order to define a multivendor instrument-on-a-card standard for industrial applications. The VXIbus specifications combine the VMEbus with the popular GPIB to create a modular instrumentation platform to meet the needs of instrumentation applications.
It is important to note that while related, VME extenders and VXI extenders do not run on the same protocol and are not interchangeable.
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