| A computer, router, switch, or other computer system that contains two or more of each of the most important subsystems, such as two disk drives, two CPUs, or two power supplies. For example, on a fully redundant LightStream 2020 Asynchronous Transfer Mode (ATM) switch, there are two network processor (NP) cards with disks, two switch cards, and two power trays. A partially redundant LightStream 2020 switch might have two NPs, one switch card, and one power tray. |