This type of switch is used in high-performance network backbones. The system has a number of slots that can be used to plug in many redundant network interface cards, including system buses, power supplies, and security modules. The entire system can be set up as a highly redundant system that provides available network services in the event of an uncontrolled disaster or failure. Performance is an important consideration for chassis-based devices, but more important is the system's high reliability and high availability. Its failure rate is usually required to be no more than 5 minutes on average annual downtime.