M-Series™ Amphenol FCI M-Series™ 56 High-Speed Mezzanine BGA Connector System is designed to support high-technology products in board-to-board or flex assembly architectures. Amphenol FCI M-Series 56 High-Speed Mezzanine BGA Connector feature a next-generation differential pair contact design for 56Gb/s non-return-to-zero (NRZ) and 112Gb/s four-level pulse-amplitude modulation (PAM-4) performance. Other features include high density, high speed, dual-point contacts, and self-aligning and self-leveling for multiple connector use.