What do the terms J1, J2, and J3 mean?
J stands for “jack” and in general (although not always) refers to the female connector. In a vertical card arrangement for a VME type backplane, the female connectors are on the backplane and the upper connector is called J1, the next lower J2, and so forth. In a vertical card arrangement for a CompactPCI type backplane, the female connectors are on the plug-in cards and the lower connector is called P1, the next higher P2, and so on.
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