This product is either discontinued or we cannot get that from suppliers.
D-LINK DXS-3600-EM-STACK, Interfaces / Ports 2 x CXP Stacking, Compatibility D-Link DXS-3600-32S Switch.
The DXS-3600-EM-STACK stacking module provides 2 x 120G CXP ports for stacking the DXS-3600-32S managed aggregation switch. It must be used in conjunction with DEM-CB50CXP 50cm 120G CXP stacking cable.