Chapter 1: Introduction I/O Shield The SC822 is a 2U rackmount chassis. Its I/O backpanel provides two riser card slots, one COM port, two USB ports, a VGA (monitor) port, PS/2 mouse and keyboard ports and two Ethernet ports. (See Figure 1-1.) 3 Full Length PCI Slots Figure 1-1. I/O Backpanel Cooling System The SC822 chassis has an innovative cooling design that includes four 8- cm redundant system cooling (intake) fans. The fans plug into chassis fan connectors that located behind the HDD drive bays and continuously oper- ate at full rpm. If a fan fails, the ambient air temperature inside the chassis will rise and activate an overheat LED. 1-3