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The power supply for a
LightStream 2020 Asynchronous Transfer Mode (ATM) switch. A LightStream 2020
switch can have one or two bulk power trays. In a redundant system, the two
power trays load share, but each can power the entire system in the event that
the other fails. The power tray can provide either alternating current (AC) or
direct current (DC) power to the switch.
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