Harting, har-bus HM 2mm Pitch Hard Metric Type C Backplane Connector, Female, Right Angle, 11 Column, 5 Row, 55 Way

The IEC 61076-4-101 connector has been designed to meet high speed applications. This modular 2mm interconnection system uses increments of 25mm, with 5 rows of signal contacts, and the option of 2 additional rows for outer shielding.

For compact PCI/VME bus and proprietary applications
32//64 Bit Transfer Rates
Number of contacts range from 55 way up to 308 way
Pre-installed upper shields on the sockets