Three-dimensional backplane

A three-dimensional backplane, comprising:

• a first group of connectors, a second group of connectors, a first group of printed circuit boards, and a second group of printed circuit boards, wherein:
• the first group of connectors comprises at least two connectors;
• the second group of connectors comprises at least two connectors;
• the first group of printed circuit boards comprises at least two printed circuit boards, or the second group of printed circuit boards comprises at least two printed circuit boards;
• the first group of connectors is disposed on the first group of printed circuit boards;
• the second group of connectors is disposed on the second group of printed circuit boards;
• each printed circuit board in the first group of printed circuit boards is connected to all printed circuit boards in the second group of printed circuit boards;
• each printed circuit board in the second group of printed circuit boards is connected to all printed circuit boards in the first group of printed circuit boards;
• each connector in the first group of connectors is connected to all connectors in the second group of connectors through all connections between a printed circuit board, where the connector is disposed, in the first group of printed circuit boards and all printed circuit boards in the second group of printed circuit boards;
• and
• each connector in the second group of connectors is connected to all connectors in the first group of connectors through all connections between a printed circuit board, where the connector is disposed, in the second group of printed circuit boards and all printed circuit boards in the first group of printed circuit boards.