ZQSFP+ is the industry-standard form factor for 56 Gbps PAM4 and 112 Gbps PAM4 optical transceivers, used in data-center switch line cards, NIC mezzanine boards, and high-speed backplane I/O panels.
Press-fit tails are the standard termination for high-density backplane and line-card connectors because they avoid solder voids and the thermal stress of reflow. The 2227667-1 uses compliant press-fit pins that cold-weld into the plated through-hole — no solder paste, no wave, no rework of a bridged joint in a 152-position footprint. The EMI Shielded cage is integral to the assembly: the stamped-metal cage surrounds each port and grounds to the PCB through the press-fit shield pins, providing the conductive enclosure needed for FCC/CE emissions compliance at 25+ Gbps per lane without a separate gasket.
The gold layer resists wear-through from repeated transceiver insertion and removal in field-service and test-lab environments, and the underlying nickel barrier prevents copper diffusion that would increase contact resistance over the life of the system.