Architecture used to maintain high data transfer rates over long distances. With FC-AL storage arrays can be separated by as much as 20 kilometers, connected by only one nonamplified Fibre Channel fiber optic link. In the dual-loop architecture, data transfer rates can reach 200 Mb/s. Another advantage is increased fault tolerance. In the unlikely event of a drive failure, port bypass circuits single out each failed drive and quickly route around it, with no limitation on the number of drives that can be bypassed.