261501-001 Copper cube QuadT interconnect module, 4-connector

For use in  HP Blade Servers series:BL20P
BL20P G2 - BL20P G3 - BL30P - BL40P - BL35P - BL45P - BL25P

These cubes are part of below mentioned HP article:

283192-B21 C-GbE2 Interconnect Switch (copper) kit (contains two GbE2 Interconnect Switches and two QuadT2 Interconnect Modules.)