TE Connectivity, Z-PACK HM-Zd 2.5mm Pitch High Speed Hard Metric Backplane Connector, Female, Right Angle, 4 Row, 40 Way

Z-PACK™ HM-Zd headers and connector assemblies with a 2.50mm centerline. These Z-PACK™ HM-Zd Pin headers and receptacle connector assemblies are press fit PCB through hole mounting and have polyester GF housings.

HM-Zd is the backplane interconnect for PICMG 3.x (ATCA) industry standard
High speed, differential, board to backplane electrical connectors
Provides a differential solution for applications in the range 3 to 6.4 Gb/s
Extension of IEC61076-4-101

PICMG

The Z-PACK 2 mm HM Interconnection System is designed as a two part system for the connection of free boards (Daughterboards or PCBs) to fixed boards (Motherboards, Backplane or Backpanel) and feed the connection through the fixed board.