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A modular board to board mezzanine ball grid array BGA connector includes a plug, a receptacle and if needed an adapter. The plug and the receptacle can be made form the same base pieces to accommodate different stack heights. If a greater stack height is needed, spacers can be used in the plug and

A modular board to board mezzanine ball grid array BGA connector includes a plug, a receptacle and if needed an adapter. The plug and the receptacle can be made form the same base pieces to accommodate different stack heights. If a greater stack height is needed, spacers can be used in the plug and the receptacle to accommodates a greater selected stack height. The plug and the receptacle both include a base having an interstitial diamond recesses in which the solder balls are disposed and in which one end of a contact is inserted. The plug may further include a plug cover that can be connected to the base, and the receptacle may include a receptacle cover that fits over its base. The plug can have a plug contact assembly, and the receptacle can have a receptacle contact assembly. The plug and the receptacle can be mated by mating the plug cover to the receptacle cover and the receptacle contacts to the plug contacts. If a larger stack height is desired, a spacer can be attached to the base of either or both the plug or the receptacle to achieve a larger stack height.

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1. A modular mezzanine connector system, comprising:(a) a plug assembly, comprising: (a1) a first common base comprising a plurality of fusible elements which are each disposed adjacent to the first common base; (a2) a plug contact assembly mounted within the plug assembly comprising a plurality of

1. A modular mezzanine connector system, comprising:(a) a plug assembly, comprising: (a1) a first common base comprising a plurality of fusible elements which are each disposed adjacent to the first common base; (a2) a plug contact assembly mounted within the plug assembly comprising a plurality of plug contacts, each plug contact comprising an end which is secured to one of the fusible elements adjacent to the first common base; (a3) a plug cover coupled to the first common base; and (a4) a spacer mounted between the plug cover and the first common base; and (b) a receptacle assembly that mates with the plug assembly, comprising: (b1) a second common base comprising a plurality of fusible elements which are each disposed adjacent to the second common base and wherein the first common base and the second common base are substantially identical and interchangeable; (b2) a receptacle contact assembly mounted within the receptacle assembly and comprising a plurality of receptacle contacts, each receptacle contact comprising an end which is secured to one of the fusible elements adjacent to the second common base; and (b3) a receptacle cover that is coupled to the second common base and that mates with the plug cover. 2. The modular mezzanine connector system of claim 1, wherein the receptacle assembly further comprises a spacer mounted between the receptacle cover and the second common base.3. The modular mezzanine connector system of claim 1, wherein the plug assembly further comprises a spacer mounted between the plug cover and the first common base and the receptacle assembly further comprises a spacer mounted between the receptacle cover and the second common base.4. The modular mezzanine connector system of claim 1, wherein the plurality of plug and receptacle contacts are disposed in an in-line stripline configuration.5. The modular mezzanine connector system of claim 1, wherein the plurality of plug contacts and receptacle contacts comprise signal contacts and are disposed in a row each contact oriented perpendicular to a ground plane.6. The modular mezzanine connector system of claim 1, further comprising an adaptor which is mated to the plug cover and the receptacle cover.7. The modular mezzanine style connector of claim 1, wherein the receptacle contact assembly further comprises a support member and the receptacle cover further comprises a member that runs along a midplane through the receptacle cover, the member of the receptacle cover having a groove so that the support member is inserted into the groove in order to center align the receptacle contact assembly.8. The modular mezzanine connector system of claim 1, wherein the receptacle contact assembly comprises at least one row of individual contacts that are disposed in a ground, signal, signal, ground pattern, and wherein the plug contact assembly comprises at least one row of individual contacts disposed in a ground, signal, ground pattern, and wherein each adjacent two receptacle signal contacts mate with one plug signal contact beam.9. The modular mezzanine connector system of claim 1, wherein the plurality of plug contacts and receptacle contacts comprise rows of signal and ground contacts disposed within a pattern in each pattern.10. The modular mezzanine connector system of claim 9, wherein each plug ground contact comprises a first lateral side and a second lateral side and wherein the receptacle ground contacts within a row alternate mating with the first lateral side and the second lateral side of a ground plug contact.11. The modular mezzanine connector system of claim 1, wherein the plurality of fusible elements of the first common base are each disposed within respective pockets defined within the first common base, and the plurality of fusible elements of the second common base are each disposed within respective pockets defined within the second common base.12. The modular mezzanine connector system of claim 11, wherein the pockets of the first and the second common base are disposed in an interstitial diamond configuration.13. The modular mezzanine connector system of claim 11, wherein the pockets of the first and the second common base are disposed in an interstitial diamond configuration and the first and the second common base further comprise a recess disposed above each of the pockets through which a contact can be inserted.14. A method of making a modular mezzanine connector system to a desired stack height, comprising:inserting a plurality of plug contacts into a first common base; coupling a plug cover to the first common base and if needed to meet the desired stack height attaching a spacer between the plug base and the plug cover; inserting a plurality of receptacle contacts into a second common base interchangeable with the first common base, the first and the second common bases each comprising a plurality of pockets that are disposed in an interstitial diamond configuration; coupling a receptacle cover to the second common base; and coupling the plug cover to the receptacle cover and thereby placing the plurality of plug contacts into electrical communication with the plurality of receptacle contacts. 15. The method of claim 14, wherein each of the fusible elements comprise a solder ball.16. The method of claim 14, wherein inserting the plurality of plug contacts further comprises inserting the plurality of plug contacts in an in-line stripline configuration and wherein inserting the plurality of receptacle contacts further comprises inserting the receptacle contacts in an in-line stripline configuration.17. The method of claim 14, wherein inserting the plurality of plug contacts further comprises inserting the plurality of plug contacts in a row with each contact oriented perpendicular to a ground plane and wherein inserting the plurality of receptacle contacts further comprises inserting the receptacle contacts in a row perpendicular to a ground plane.18. The method of claim 14, wherein coupling the plug cover to the first common base comprises inserting a plurality of tabs extending from the first common base into a plurality of channels in the plug cover.19. The method of claim 14, wherein coupling the receptacle cover to the second common base comprises inserting a plurality of tabs extending from the second common base into a plurality of channels in the receptacle cover.20. The method of claim 14, wherein coupling the plug cover to the receptacle cover comprises inserting the receptacle cover into an interior of the plug cover in an interference fit.21. The method of claim 14, wherein coupling the plug cover to the receptacle cover comprises inserting the plurality of plug contacts through slots in the receptacle cover and into contact with a corresponding receptacle contact.22. The method of claim 14, wherein coupling the plug cover to the receptacle cover and thereby placing the plurality of plug contacts into electrical communication with the plurality of receptacle contacts comprises mating each ground receptacle contact in an alternating pattern with each plug ground contact such that every other receptacle ground contact within a row of receptacle contacts mates with a first lateral side of a plug ground contact and the other receptacle contacts with the row of receptacle contacts mate with a second lateral side of a plug ground contact.23. The method of claim 14, further comprising inserting a support member of the receptacle contact assembly into a groove of a member that extends along a midplane of the receptacle cover to thereby center align the receptacle contacts.24. A modular mezzanine connector system, comprising:a plug assembly and a receptacle assembly that mates with the plug assembly, the plug assembly and the receptacle assembly each comprising a base which comprises a plurality of recesses; a plurality of diamond pockets disposed in an interstitial diamond configuration and there being a pocket beneath each recess so that a contact can extend through one of the recesses and into one of the pockets; the plurality of recesses being substantially rectangular in shape so that a contact extending through the recess and into the diamond pocket can receive a fusible element around a periphery of a portion of the contact extending into the pocket. 25. The modular mezzanine connector system of claim 24, further comprising a plug cover coupled to the base of the plug assembly and a receptacle cover coupled to the base of the receptacle assembly.26. The modular mezzanine connector system of claim 24, wherein the plug assembly further comprises a plurality of plug contacts disposed in an in-line stripline configuration and the receptacle assembly further comprises a plurality of receptacle contacts disposed in an in-line stripline configuration.27. The modular mezzanine connector system of claim 24, wherein the plug assembly further comprises a plurality of plug contacts disposed in a row with each contact oriented perpendicular to a ground plane and the receptacle assembly further comprises a plurality of receptacle contacts disposed in a row parallel to a ground plane.28. The modular mezzanine style connector of claim 24, wherein the receptacle assembly further comprises a receptacle cover having a member that extends along a midplane of the receptacle assembly and that has a plurality of grooves that receive a support member of a contact assembly in order to center align each contact assembly.29. The modular mezzanine style connector of claim 24, wherein the receptacle assembly further comprises a receptacle contact assembly comprising at least one row of individual contacts that are disposed in a ground, signal, signal, ground pattern, and wherein the plug assembly further comprises a plug contact assembly comprising at least one row of individual contacts disposed in a ground, signal, ground pattern, and wherein each adjacent two receptacle signal contacts mate with one plug signal contact.30. An electrical connector system, comprising:(a) a plug assembly, comprising: (a1) a first common base comprising a plurality of fusible elements which are each disposed adjacent to the first common base; (a2) a plug contact assembly mounted within the plug assembly comprising a plurality of individual ground and signal plug contacts, each plug contact comprising an end which is secured to one of the fusible elements adjacent to the first common base; (a3) a plug cover coupled to the first common base; (b) a receptacle assembly that mates with the plug assembly, comprising: (b1) a second common base comprising a plurality of fusible elements which are each disposed adjacent to the second common base and wherein the first common base and the second common base are substantially identical and interchangeable; (b2) a receptacle contact assembly mounted within the receptacle assembly comprising a plurality of individual ground and signal receptacle contacts, each receptacle contact comprising an end which is secured to one of the fusible elements adjacent to the second common base, the individual ground and signal receptacle contacts being disposed in rows with each row having contact beams disposed in a ground, signal, signal, ground pattern, each receptacle signal contact mating one of the individual plug signal contacts and each receptacle ground contact mating one of the individual plug ground contacts; (b3) a receptacle cover that is coupled to the second common base and that mates with the plug cover. 31. The system of claim 30, wherein the plurality of fusible elements of the first common base are each disposed within respective pockets defined within the first common base, and the plurality of fusible elements of the second common base are each disposed within respective pockets defined within the second common base.32. A modular mezzanine connector system, comprising:(a) a plug assembly, comprising: (a1) a first common base comprising a plurality of fusible elements which are each disposed adjacent to the first common base; (a2) a plug contact assembly mounted within the plug assembly comprising a plurality of plug contacts, each plug contact comprising an end which is secured to one of the fusible elements adjacent to the first common base; and (a3) a plug cover coupled to the first common base; and (b) a receptacle assembly that mates with the plug assembly, comprising: (b1) a second common base comprising a plurality of fusible elements which are each disposed adjacent to the second common base and wherein the first common base and the second common base are substantially identical and interchangeable; (b2) a receptacle contact assembly mounted within the receptacle assembly and comprising a plurality of receptacle contacts, each receptacle contact comprising an end which is secured to one of the fusible elements adjacent to the second common base; (b3) a receptacle cover that is coupled to the second common base and that mates with the plug cover; and (b4) a spacer mounted between the receptacle cover and the second common base. 33. The system of claim 32, wherein the plurality of fusible elements of the first common base are each disposed within respective pockets defined within the first common base, and the plurality of fusible elements of the second common base are each disposed within respective pockets defined within the second common base.34. A modular mezzanine connector system, comprising:(a) a plug assembly, comprising: (a1) a first common base comprising a plurality of fusible elements which are each disposed adjacent to the first common base; (a2) a plug contact assembly mounted within the plug assembly comprising a plurality of plug contacts, each plug contact comprising an end which is secured to one of the fusible elements adjacent to the first common base; (a3) a plug cover coupled to the first common base; and (a4) a spacer mounted between the plug cover and the first common base; and (b) a receptacle assembly that mates with the plug assembly, comprising: (b1) a second common base comprising a plurality of fusible elements which are each disposed adjacent to the second common base and wherein the first common base and the second common base are substantially identical and interchangeable; (b2) a receptacle contact assembly mounted within the receptacle assembly and comprising a plurality of receptacle contacts, each receptacle contact comprising an end which is secured to one of the fusible elements adjacent to the second common base; and (b3) a receptacle cover that is coupled to the second common base and that mates with the plug cover, and (b4) a spacer mounted between the receptacle cover and the second common base. 35. The system of claim 34, wherein the plurality of fusible elements of the first common base are each disposed within respective pockets defined within the first common base, and the plurality of fusible elements of the second common base are each disposed within respective pockets defined within the second common base.36. A modular mezzanine connector system, comprising:(a) a plug assembly, comprising: (a1) a first common base comprising a plurality of fusible elements which are each disposed within a pocket defined within the first common base; (a2) a plug contact assembly mounted within the plug assembly comprising a plurality of plug contacts, each plug contact comprising an end which is secured to one of the fusible elements within one of the pockets of the first common base; and (a3) a plug cover coupled to the first common base; and (b) a receptacle assembly that mates with the plug assembly, comprising: (b1) a second common base comprising a plurality of fusible elements which are each disposed within a pocket disposed within the second common base and wherein the first common base and the second common base are substantially identical and interchangeable; (b2) a receptacle contact assembly mounted within the receptacle assembly and comprising a plurality of receptacle contacts, each receptacle contact comprising an end which is secured to one of the fusible elements within one of the pockets of the second common base; and (b3) a receptacle cover that is coupled to the second common base and that mates with the plug cover, wherein the pockets of the first and the second common bases are disposed in an interstitial diamond configuration. 37. A modular mezzanine connector system, comprising:(a) a plug assembly, comprising: (a1) a first common base comprising a plurality of fusible elements which are each disposed within a pocket defined within the first common base; (a2) a plug contact assembly mounted within the plug assembly comprising a plurality of plug contacts, each plug contact comprising an end which is secured to one of the fusible elements within one of the pockets of the first common base; and (a3) a plug cover coupled to the first common base; and (b) a receptacle assembly that mates with the plug assembly, comprising: (b1) a second common base comprising a plurality of fusible elements which are each disposed within a pocket disposed within the second common base and wherein the first common base and the second common base are substantially identical and interchangeable; (b2) a receptacle contact assembly mounted within the receptacle assembly and comprising a plurality of receptacle contacts, each receptacle contact comprising an end which is secured to one of the fusible elements within one of the pockets of the second common base; and (b3) a receptacle cover that is coupled to the second common base and that mates with the plug cover, wherein the pockets of the first and the second common bases are disposed in an interstitial diamond configuration and the first and second common bases further comprise a recess disposed above each of the pockets through which a contact can be inserted. 38. A modular mezzanine connector system, comprising:(a) a plug assembly, comprising: (a1) a first common base comprising a plurality of fusible elements which are each disposed adjacent to the first common base; (a2) a plug contact assembly mounted within the plug assembly comprising a plurality of plug contacts, each plug contact comprising an end which is secured to one of the fusible elements adjacent to the first common base; and (a3) a plug cover coupled to the first common base; and (b) a receptacle assembly that mates with the plug assembly, comprising: (b1) a second common base comprising a plurality of fusible elements which are each disposed adjacent to the second common base and wherein the first common base and the second common base are substantially identical and interchangeable; (b2) a receptacle contact assembly mounted within the receptacle assembly and comprising a plurality of receptacle contacts and a support member, each receptacle contact comprising an end which is secured to one of the fusible elements adjacent to the second common base, the receptacle assembly further comprising a support member; (b3) a receptacle cover that is coupled to the second common base and that mates with the plug cover, the receptacle cover comprising a member that runs along a midplane through the receptacle cover, the member of the receptacle cover having a groove so that the support member is inserted into the groove in order to center align the receptacle contact assembly. 39. The system of claim 38, wherein the plurality of fusible elements of the first common base are each disposed within respective pockets defined within the first common base, and the plurality of fusible elements of the second common base are each disposed within respective pockets defined within the second common base.40. A modular mezzanine connector system, comprising:(a) a plug assembly, comprising: (a1) a first common base comprising a plurality of fusible elements which are each disposed adjacent to the first common base; (a2) a plug contact assembly mounted within the plug assembly comprising a plurality of plug contacts, each plug contact comprising an end which is secured to one of the fusible elements adjacent to the first common base, the plug contact assembly comprising at least one row of individual contacts disposed in a ground, signal, ground pattern; and (a3) a plug cover coupled to the first common base; and (b) a receptacle assembly that mates with the plug assembly, comprising: (b1) a second common base comprising a plurality of fusible elements which are each disposed adjacent to the second common base and wherein the first common base and the second common base are substantially identical and interchangeable; (b2) a receptacle contact assembly mounted within the receptacle assembly and comprising a plurality of receptacle contacts, each receptacle contact comprising an end which is secured to one of the fusible elements adjacent to the second common base, the receptacle contact assembly comprising at least one row of individual contacts that are disposed in the ground, signal, signal, ground pattern, each adjacent two receptacle signal contacts mating with one plug signal contact beam; and (b3) a receptacle cover that is coupled to the second common base and that mates with the plug cover. 41. The system of claim 40, wherein the plurality of fusible elements of the first common base are each disposed within respective pockets defined within the first common base, and the plurality of fusible elements of the second common base are each disposed within respective pockets defined within the second common base.42. A method of making a modular mezzanine connector system to a desired stack height, comprising:inserting a plurality of plug contacts into a first common base; coupling a plug cover to the first common base and if needed to meet the desired stack height attaching a spacer between the plug base and the plug cover; inserting a plurality of receptacle contacts into a second common base interchangeable with the first common base; coupling a receptacle cover to the second common base; coupling the plug cover to the receptacle cover and thereby placing the plurality of plug contacts into electrical communication with the plurality of receptacle contacts; and inserting a support member of the receptacle contact assembly into a groove of a member that extends along a midplane of the receptacle cover to thereby center align the receptacle contacts.