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Power supply installation
About the power distribution unit
Introduction
A PDU is installed in a rack that has DC-powered servers. Power from the DC supply source
enters the PDU and can then be distributed to one or more servers. A single PDU can supply
DC power to four DC power supply modules. A server can have either one or two power supply
modules installed. You can determine the number of PDUs to install in a rack by counting the
number of power supply modules in each rack.
PDU power and grounding
To ensure a complete power and grounding installation:
In rackmount DC-powered server installations, ensure the PDU (Power Distribution Unit for
DC applications) is installed on the same rack as the CallPilot server. This is required since
the main ground wire for the PDU is not insulated from the metal enclosure.
Multiple PDUs
A server operates on a single power supply module. Its total capacity is two installed power
supply modules. The second power supply module is the redundant power supply module.
A PDU can distribute power to a maximum of four power supply units that can be installed in
two or more servers. Therefore, if there are three or four servers installed in a rack, then you
must install a second PDU.
Note:
The power supply module installs in the server. It does not refer to a UPS, which is a separate
unit on the rack.
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Avaya CallPilot
1002rp Server Hardware Installation
December 2010
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