
A backplane (or `backplane system`) is a group of electrical connectors in parallel with each other, so that each pin of each connector is linked to the same relative pin of all the other connectors forming a computer bus. It is used as a backbone to connect several printed circuit boards together to make up a complete computer system. Backplane.....
Found on
http://en.wikipedia.org/wiki/Backplane

a small printed circuit board with connectors on it that allows you to plug in a number of expansion cards
Found on
http://www.archivemag.co.uk/

In card racking systems, a PCB populated with rows of connectors to mate with plugged in cards. Backplanes can provide only interconnections, just a few termination components, or be active parts of the systems with bus drivers and possible bus arbitration facilities.
Found on
http://www.vutrax.co.uk/glossary.htm

The communication channels of a single device's architecture, such as in a hub or concentrator.
Found on
https://www.encyclo.co.uk/local/22803
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