Carrier Class Redundancy

Carrier grade system or Carrier class system, in telecomunications, refers to a system of components hardware and software used in large, high-speed (higher speeds are achieved through the use of WDM, TDM, and FDM technologies) networks. It implies extremely reliable, well tested and proven capabilities. Carrier-class or Carrier-grade systems are tested and engineered to meet or exceed "five nines" High availability standards, and provide very fast (normally less than 50 millionths of a second) fault recovery through redundancy.