olemus
(a) ISO/IEC 10859, 14776-121:
plaadipesadega trükkplaat pistikplaatmoodulite ühendamiseks
= printed circuit board that contains the interconnect traces and connectors, into which boards or plug-in units are inserted
https://en.wikipedia.org/wiki/Backplane
(b) IEC 796, ISO 6951, ISO/IEC 13213, 13961:
siini moodustav plaadipesadega trükkplaat
= the assembly of the bus with connectors into which spur cards may be plugged
(c) mõnes kontekstis ka emaplaat või selle osa
= motherboard or its component

näiteid
http://img.directindustry.com/images_di/photo-g/7058-2451255.jpg
https://upload.wikimedia.org/wikipedia/commons/thumb/c/c1/PICMG-Backplane-Details.jpg/1001px-PICMG-Backplane-Details.jpg
http://www.connectorsupplier.com/wp-content/uploads/EKF-backplane.gif
https://duckduckgo.com/?q=backplane&t=h_&iax=images&ia=images