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An interconnection assembly for a motherboard uses right-angle edge connectors attached to a bottom side of the motherboard, and vertical header connectors attached to the top side. The header connectors mate with a transition card assembly which includes a transition card having plated through hole

An interconnection assembly for a motherboard uses right-angle edge connectors attached to a bottom side of the motherboard, and vertical header connectors attached to the top side. The header connectors mate with a transition card assembly which includes a transition card having plated through holes that receive pins of the header connectors. Right-angle mezzanine connectors mounted on the transition card have pins that extend into the plated through holes from the top side. The edge connectors and mezzanine connectors both face forward in a common direction. The transition card has holes along a rear edge to retain pressed-in nuts for mounting to a stabilizing bezel. Instead of pins being part of the header connectors, connector caps may be provided with pins having first ends that extend into sockets of the header connectors and second ends that extend into the plated through holes of the transition card.

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1. An electronic interconnection assembly comprising: a first circuit board having first and second opposing surfaces and at least one edge defining a forward area in front of said circuit board;a first right-angle connector mounted to said first surface of said first circuit board proximate said ed

1. An electronic interconnection assembly comprising: a first circuit board having first and second opposing surfaces and at least one edge defining a forward area in front of said circuit board;a first right-angle connector mounted to said first surface of said first circuit board proximate said edge, providing electrical connections with a first plurality of connection points on said first surface of said first circuit board, and having a first interconnect facing toward said forward area;a header connector mounted to said second surface of said first circuit board proximate said edge, providing electrical connections with a second plurality of connection points on said second surface of said first circuit board, and having a first plurality of pins extending away from said second surface of said first circuit board;a second circuit board having first and second opposing surfaces and a plurality of plated through holes which receive said first plurality of pins along said first surface of said second circuit board, wherein said first and second circuit boards are generally parallel; anda second right-angle connector mounted to said second surface of said second circuit board having a second plurality of pins which are received by said plated through holes along said second surface of said second circuit board, and having a second interconnect facing toward said forward area. 2. The electronic interconnection assembly of claim 1 wherein said first interconnect and said second interconnect faces a common direction which is generally orthogonal to said edge and generally parallel to a plane formed by said first circuit board. 3. The electronic interconnection assembly of claim 1 wherein said header connector is mounted to said first circuit board behind said first right-angle connector with respect to said edge. 4. The electronic interconnection assembly of claim 1 wherein: a first forward face of said first interconnect is located in front of said edge; anda second forward face of said second interconnect is located behind said edge. 5. The electronic interconnection assembly of claim 1 wherein: said first right-angle connector is one of a first plurality of right-angle connectors mounted to said first surface of said first circuit board proximate said edge;said header connector is one of a plurality of header connectors mounted to said second surface of said first circuit board proximate said edge; andsaid second right-angle connector is one of a second plurality of right-angle connectors mounted to said second surface of said second circuit board. 6. The electronic interconnection assembly of claim 5 wherein said second circuit board is generally elongate and has a rear edge, with a plurality of holes formed therein proximate said rear edge which retain pressed-in nuts for mounting said second circuit board to a support structure. 7. An electronic interconnection assembly comprising: a first circuit board having first and second opposing surfaces and at least one edge defining a forward area in front of said circuit board;a first right-angle connector mounted to said first surface of said first circuit board proximate said edge, providing connections with a first plurality of connection points on said first surface of said first circuit board, and having a first interconnect facing toward said forward area;a header connector mounted to said second surface of said first circuit board proximate said edge, providing connections with a second plurality of connection points on said second surface of said first circuit board, and having a plurality of sockets facing away from said second surface of said first circuit board;a second circuit board having first and second opposing surfaces and a plurality of plated through holes, said second circuit board being generally parallel to said first circuit board;a connector cap mounted to said first surface of said second circuit board, said connector cap retaining a first plurality of pins having first and second ends, said first ends being removably received by said sockets of said header connector, and said second ends being received by said plated through holes along said first surface of said second circuit board, said connector cap engaging said header connector; anda second right-angle connector mounted to said second surface of said second circuit board having a second plurality of pins which are received by said plated through holes along said second surface of said second circuit board, and having a second interconnect facing toward said forward area. 8. The electronic interconnection assembly of claim 7 wherein said first interconnect and said second interconnect face a common direction which is generally orthogonal to said edge and generally parallel to said first and second circuit boards. 9. The electronic interconnection assembly of claim 7 wherein: said first right-angle connector is one of a first plurality of right-angle connectors mounted to said first surface of said first circuit board proximate said edge in a first row;said header connector is one of a plurality of header connectors mounted to said second surface of said first circuit board proximate said edge in a second row;said connector cap is one of a plurality of connector caps mounted to said first surface of said second circuit board in a third row which engage said plurality of header connectors; andsaid second right-angle connector is one of a second plurality of right-angle connectors mounted to said second surface of said second circuit board in a fourth row which generally overlaps said second and third rows. 10. The electronic interconnection assembly of claim 9 wherein said second circuit board is generally elongate in a direction of said rows and has a rear edge, and further comprising a stabilizing bezel wherein said second circuit board is affixed along its rear edge to said stabilizing bezel. 11. A card edge interconnection assembly comprising: a motherboard having first and second opposing surfaces and at least one straight forward edge;a plurality of right-angle edge connectors mounted to said first surface of said motherboard in a first row proximate said forward edge and parallel thereto, each right-angle edge connector providing electrical connections with a corresponding set of first connection points on said first surface of said motherboard, and having a first interconnect facing away from said forward edge in a direction which is generally orthogonal to said forward edge and generally parallel to said motherboard;a plurality of header connectors mounted to said second surface of said motherboard in a second row generally parallel to said first row proximate said forward edge and behind said right-angle edge connectors, each header connector providing electrical connections with a corresponding set of second connection points on said second surface of said motherboard, and having a plurality of sockets facing away from said second surface of said motherboard;a transition card having first and second opposing surfaces and sets of plated through holes, said transition card disposed generally parallel to said motherboard;a plurality of connector caps mounted to said first surface of said transition card in a third row generally parallel to said first and second rows, each connector cap retaining a plurality of first pins having first and second ends, said first ends being received by sockets of a corresponding one of said header connectors, and said second ends being received by a corresponding one of said sets of plated through holes along said first surface of said transition card, said connector caps respectively engaging said header connectors; anda plurality of right-angle mezzanine connectors mounted to said second surface of said transition card, each right-angle mezzanine connector having a plurality of second pins which are received by a corresponding one of said sets of plated through holes along said second surface of said transition card, and having a second interconnect facing the direction which is generally orthogonal to said forward edge and generally parallel to said motherboard. 12. The card edge interconnection assembly of claim 11, wherein: a first forward face of said first interconnect is located in front of said forward edge; anda second forward face of said second interconnect is located behind said forward edge. 13. The card edge interconnection assembly of claim 11 wherein a given one of said header connectors is aligned with a corresponding one of said right-angle edge connectors. 14. The card edge interconnection assembly of claim 11 wherein: said motherboard is generally horizontal, with said first surface of said motherboard being a bottom surface and said second surface of said motherboard being a top surface;said right-angle edge connectors are cable connectors; andsaid right-angle mezzanine connectors are expansion card connectors. 15. A bezel for an electronic interconnection assembly comprising: a handle portion;a lower portion attached to said handle portion; anda transition card assembly attached to said lower portion, said transition card assembly including a generally horizontal, elongate transition card having a bottom surface, a top surface, and a plurality of sets of plated through holes,a plurality of connector caps mounted to said bottom surface in a row, each connector cap retaining a plurality of first pins having first and second ends, said first ends extending downwardly, and said second ends being received by a corresponding one of said sets of plated through holes, anda plurality of right-angle mezzanine connectors mounted to said top surface in a row, each right-angle mezzanine connector having a plurality of second pins which are received by a corresponding one of said sets of plated through holes along said second surface of said transition card. 16. The bezel of claim 15 wherein said lower portion includes a plurality of walls which partition a space above said transition card assembly. 17. The bezel of claim 15 wherein said transition card is attached to said lower portion using nuts which are pressed into holes formed along a rear edge of said transition card, said rear edge being opposite a forward face of said right-angle mezzanine connectors. 18. The bezel of claim 15 wherein said lower portion includes a left-side lower portion and a right-side lower portion each attached to said handle portion, said transition card assembly being a first transition card assembly attached to said left-side lower portion, and further comprising a second transition card assembly attached to said right-side lower portion, said first and second transition card assemblies being maintained in spaced relation, and said first and second transition card assemblies being generally parallel and aligned. 19. A central electronic complex drawer for a computer system, comprising: a chassis having two opposing sidewalls;a generally horizontal motherboard mounted to said chassis, having a bottom surface, a top surface, and at least one straight forward edge;an electronic interconnection assembly including a plurality of right-angle edge connectors mounted to said bottom surface of said motherboard in a first row proximate said forward edge and parallel thereto, each right-angle edge connector providing electrical connections with a corresponding set of first connection points on said bottom surface of said motherboard, and having a first interconnect facing away from said forward edge in a direction which is generally orthogonal to said forward edge and generally parallel to said motherboard,a plurality of vertical header connectors mounted to said top surface of said motherboard in a second row generally parallel to said first row proximate said forward edge and behind said right-angle edge connectors, each vertical header connector providing electrical connections with a corresponding set of second connection points on said top surface of said motherboard, and having a plurality of sockets facing away from said top surface of said motherboard,a transition card having a bottom surface, a top surface, and a plurality of sets of plated through holes, said transition card disposed generally parallel to said motherboard,a plurality of connector caps mounted to said bottom surface of said transition card in a third row generally parallel to said first and second rows, each connector cap retaining a plurality of first pins having first and second ends, said first ends being received by sockets of a corresponding one of said vertical header connectors, and said second ends being received by a corresponding one of said sets of plated through holes along said bottom surface of said transition card, said connector caps respectively engaging said vertical header connectors, anda plurality of right-angle mezzanine connectors mounted to said top surface of said transition card, each right-angle mezzanine connector having a plurality of second pins which are received by a corresponding one of said sets of plated through holes along said top surface of said transition card, and having a second interconnect facing the direction which is generally orthogonal to said forward edge and generally parallel to said motherboard; anda bezel which stabilizes said electronic interconnection assembly. 20. The central electronic complex drawer of claim 19 wherein said forward edge includes a left-side forward edge and a right-side forward edge, said electronic interconnection assembly being a first electronic interconnection assembly located along said left-side forward edge, and further comprising a second electronic interconnection assembly located along said right-side forward edge, wherein said bezel includes a handle portion, a left-side lower portion attached to said handle portion, and a right-side lower portion attached to said handle portion, said left-side lower portion being attached to said transition card of said first electronic interconnection assembly and said right-side lower portion being attached to another transition card of said second electronic interconnection assembly, said bezel maintaining said transition cards in spaced relation. 21. The central electronic complex drawer of claim 20 wherein said bezel has a length approximately equal to an interior width of said chassis as defined by said side walls. 22. The central electronic complex drawer of claim 19 wherein said right-angle edge connectors are cable connectors, and said right-angle mezzanine connectors are expansion card connectors. 23. The central electronic complex drawer of claim 22 wherein said cable connectors are symmetric multiprocessing bus (SMP) cable connectors, and said expansion card connectors are peripheral component interconnect express (PCIe) expansion card connectors. 24. An electronic interconnection assembly comprising: a first circuit board having first and second opposing surfaces and at least one edge defining a forward area in front of said circuit board;a first right-angle connector mounted to said first surface of said first circuit board proximate said edge, providing electrical connections with a first plurality of connection points on said first surface of said first circuit board, and having a first interconnect facing toward said forward area, said first right-angle connector being one of a first plurality of right-angle connectors mounted to said first surface of said first circuit board proximate said edge;a header connector mounted to said second surface of said first circuit board proximate said edge, providing electrical connections with a second plurality of connection points on said second surface of said first circuit board, and having a first plurality of pins extending away from said second surface of said first circuit board, said header connector being one of a plurality of header connectors mounted to said second surface of said first circuit board proximate said edge;a second circuit board having first and second opposing surfaces and a plurality of plated through holes which receive said first plurality of pins along said first surface of said second circuit board; anda second right-angle connector mounted to said second surface of said second circuit board having a second plurality of pins which are received by said plated through holes along said second surface of said second circuit board, and having a second interconnect facing toward said forward area, said second right-angle connector being one of a second plurality of right-angle connectors mounted to said second surface of said second circuit board.