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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.
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