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A backplane slot configuration and a bridge card for expanding the expansion slots of one system to include the expansion slots of an adjacent electrically separate system within the same cabinet, and bridging the expansion buses with minimal change of electrical characteristics, particularly impeda

A backplane slot configuration and a bridge card for expanding the expansion slots of one system to include the expansion slots of an adjacent electrically separate system within the same cabinet, and bridging the expansion buses with minimal change of electrical characteristics, particularly impedance, across the bridge. Adjacent end slots are spaced apart according to the relevant specification, and each slot set is configured so that the backplane expansion buses span contiguous slots and the expansion buses include the adjacent end slot.

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[ What is claimed is:] [1.]1. A system for combining expansion slot sets, comprising:two sets of backplane expansion slots laterally adjacent each other,both of said slot sets in accordance with the same specification that includes slot center-to-center spacing,the adjacent end slots of said slot se

[ What is claimed is:] [1.]1. A system for combining expansion slot sets, comprising:two sets of backplane expansion slots laterally adjacent each other,both of said slot sets in accordance with the same specification that includes slot center-to-center spacing,the adjacent end slots of said slot sets arranged in a spaced relationship to each other in accordance with said slot center-to-center spacing,said slot sets connected to one or more backplane expansion buses,each of said slots capable of supporting connections to one or more of said one or more backplane expansion buses,each of said buses connected to two or more adjacent slots within each of said slot sets,said slots in each of said slot sets in a physical arrangement such that one of said two or more adjacent slots connected to each of said buses is said adjacent end slot; anda double-wide bridge card operated to be installed across said adjacent end slots of said slot sets and bridge said expansion slot sets, said bridge further operated to minimize the impact of the bridging on the timing and electrical characteristics of bus signals transmitted across said bridge.