A CompactPCI (cPCI) system is a 3U or 6U Eurocard-based industrial computer, where all boards are connected via a passive PCI backplane. The pin assignments of the connectors are documented in standards, published by the organisation PICMG US and PICMG Europe. PICMG stands for PCI Industrial Computers Manufacturers Group. The connectors and the electrical rules allow for 8 boards in a PCI segment. Multiple segments are allowed with bridges. It has been suggested that this article or section be merged into 19-inch rack. ... Eurocard is a European standard format for PCB cards, which can be plugged together into a standardized subrack. ... This article or section does not cite its references or sources. ... The PCI Industrial Computers Manufacturers Group (PICMG) is a consortium of over 450 companies that collaboratively develop open specifications for high performance telecommunications and industrial computing applications. ...

Unlike the original Eurocards, which use connectors with a 0.1-inch pin spacing, CompactPCI cards use metric connectors with a 2-millimetre pin spacing, designed to the IEC 1076 standard. 3U cards have a 220-pin connector called J1, which carries the 32-bit PCI bus signals, and an optional 220-pin connector called J2, which carries either user-defined I/O or the upper 32-bits of an optional 64-bit PCI bus. 6U cards have an identical J1, a J2 that is always used for 64-bit PCI, as well as J3, J4, and J5 connectors for user-defined I/O. Support hot-pluggable An inch (plural: inches; symbol or abbreviation: in or, sometimes, ″ - a double prime) is the name of a unit of length in a number of different systems, including English units, Imperial units, and United States customary units. ... A millimetre (American spelling: millimeter, symbol mm) is an SI unit of length that is equal to one thousandth of a metre. ... The initials IEC can stand for: Independent Electoral Commission Industrial Emergency Council Inertial electrostatic confinement (in fusion energy) Institut des Experts-comptables et des Conseils fiscaux Institut dEstudis Catalans, Catalan Studies Institute Interactive Evolutionary Computation International Education Centre International Electrical Congress International Electrotechnical Commission See also IEC connector for...

• PICMG US
• PICMG Europe
• CompactPCI Systems Magazine
• CompactPCI Info
• CompactPCI pinout and signals
• Advanced Switching on CompactPCI Express