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Using DC supply to power module

I am planning to change my power infra into a all DC to get rid of clumsy UPS system. Other goals are simplifying the power infra, having true no-break system and increase energy efficiency

Is it possible to run, say Catalyst 6500, with 220V DC input?

I know that all power modules are made with SMPS architecture and can run on both DC & AC power supply but zero-crossing detectors, if installed, inside power supply module is making the trouble.

 

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