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. Note that the DXS-3600-EM-STACK is not compatible with the DXS-3600-16S aggregation switch.