PICMG 2.3
Encyclopedia
PICMG 2.3 is a specification by PICMG
PICMG
The PCI Industrial Computer Manufacturers Group is a consortium of over 227 companies. The group, founded in 1994, was originally formed to adapt PCI technology for use in high-performance telecommunications, military and industrial computing applications but its work has now grown to include...

 that standardizes user IO pin mappings from IEEE 1386 PMC sites
PCI mezzanine card
A PCI Mezzanine Card or PMC is a printed circuit board manufactured to the IEEE P1386.1 standard. This standard combines the electrical characteristics of the PCI bus with the mechanical dimensions of the Common Mezzanine Card or CMC format .A mezzanine connector connects two parallel printed...

to CompactPCI's J3/P3, J4/P4, and J5/P5 connections on a CompactPCI backplane
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