D-LINK DEM-CB100QXS-4XS, Cable QSFP+/SFP+, Cable Length 3.28 ft, Connector on First End 1 x SFF-8436 QSFP+, Second End 4 x SFF-8431 SFP+, Compatibility D-Link DXS-3600 Series Switches, Conductor Copper. The DEM-CB100QXS-4XS is a 1 meter 40GbE Direct Attach Copper (DAC) cable used with the DXS-3600-EM-4QXS module. It has a QSFP+ connector at one end and four (4) 10GbE SFP+ connectors at the other end.