Rack Power And Grounding; -48 V Dc Power Distribution Rationale - Avaya callpilot 1002rp Hardware Installation

Rack power and grounding

To ensure a complete power and grounding installation:
• In rackmount server installations, ensure the Avaya CallPilot
equipment racks are isolated from other foreign sources of ground. Acceptable isolation
methods include: isolation pads, grommeted washers, chassis side rail strips, and non-
conducting washers.
• In rackmount server installations where other equipment is also installed in the same 19"
rack, ensure that all equipment derives ground from the same service panel as Avaya
CallPilot and the switch, whether or not the equipment is AC- or DC-powered.

-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.
• 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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Avaya CallPilot 1002rp Server Hardware Installation
Rack power and grounding
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server chassis and
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