Abstract: A stiffening device for an electronics cabinet has at least two angle struts that are each formed by profile bars. The profile bars enclose an obtuse angle between them and are pivoted in the upper and lower corner regions of the cabinet frame rack. The angle struts are coupled to each other in a frictional, form-locking manner at their vertices by a tightening assembly when in a closed position. A formed fit over a large area is obtained when tightening the angle struts by attaching the profile bars of each angle strut to a door. The pivots of each angle strut are used for the pivots of the corresponding door. The tightening assembly includes a hole of radius R.sub.1 arranged at the vertex of one angle strut and a hole of radius R.sub.2 arranged at the vertex of the other angle strut. The hole dimensions are such that R.sub.2 is greater than R.sub.1. A tightening latch is arranged in both holes. The tightening latch has a first disc of radius R.sub.1 pivoted in the corresponding hole of radius R.sub.1.

Abstract: A backplane has several socket connectors arranged in parallel, side by side, on a side facing the modules. The pins of the socket connectors form a pin field on a side of the backplane facing away from said modules. At least one bus consists of at least one bus line. Each bus contact pin of each socket connector of the bus is associated with a resilient contact pin. The resilient contact pins are each electrically connected by a spring force to the corresponding bus contact pin. The resilient contact pins are electrically connected by means of the bus line. The contact of each resilient contact pin can be separated with handling means formed from insulating material. Thus, modules can be separated from the bus without requiring that these modules be pulled out of their plug-in location on a module carrier.

Abstract: A backplane has several socket connectors arranged in parallel, side by side on a side that faces the module and at least one bus that comprises several bus lines. An outer row of contact pins that function as bus contact pins are always shorter than the contact pins of a middle rows of contacts. The bus contact pins of each socket connector of the backplane line up with auxiliary contact pins. The auxiliary contact pins belong to one bus and are electrically connected with a bus line. The bus contact pins of each socket connector are electrically connected to the corresponding auxiliary contact pins via contact means which can be moved with a handling means. Thus, the modules can be separated from a bus that extends beyond the modules without having to pull out the modules from their plug-in locations on a module carrier.