Nortel Networks 1002rp manual DC power distribution rationale

Power supply installation Standard 1.07

-48 V DC power distribution rationale

„Minimum installation is one power distribution unit (PDU) with four 48 V DC branch circuits fused at 20 amperes.

„The customer must be able to shut off any branch to ensure every unit at the site continues to function properly.

„DC-powered configuration fits into this scheme as follows:

„Each PDU receives four branch circuits.

„Each server receives a feed from each PDU and a different branch circuit.

„In this fashion, with dual hot-swappable power supplies, there is no single point of failure in the power system. For example, you can remove any power supply, including a PDU, and everything continues to work.

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This is applicable to either North American or European installation sites (with a 230 V AC inverter).

The secondary rack supports four servers and follows a similar scheme.

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