Connector system for mating multiple variant circuit cards with a fixed circuit board

A circuit board adapted for mating with a plurality of circuit cards, each of the plurality of circuit cards including a plurality of electrical connectors having grouped functions, at least two of the plurality of circuit cards having different arrangements of the electrical connectors having grouped functions, the circuit board comprising:

• a plurality of groups of electrical connectors adapted for mating with electrical connectors of at least one of the plurality of circuit cards, each of the plurality of groups of electrical connectors including at least a first function connector electrically connected to a first function electrical signal line and a second function connector electrically connected to a second function electrical signal line, wherein
• the first function of each group of electrical connectors is the same,
• the second function each group of electrical connectors is the same,
• the first function is different from the second function,
• every function electrical signal line is a separate and discrete electrical signal lines from every other function electrical signal line such that no two function electrical signal lines share a common bus, and
• the plurality of groups of electrical connectors are suitable for mating with each distinct arrangement of the electrical connections on the plurality of circuit cards while maintaining electrical signal connectivity of the first function and the second function.