The DES-332GS stack module, designed for the DES-3226S and the DES-3326S is equipped with one stacking port and one GBIC port. The stacking port is for switch stacking. The GBIC port provides for flexible deployment of multimode or extended cable-length single-mode fiber. At 2000Mbps full duplex, this port gives you Gigabit server connection or attachment to a fiber backbone.