Nortel Networks NN44200-300 About the power distribution unit, DC power distribution rationale

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40Chapter 4 Power supply installation

the same service panel as 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.

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.

Nortel CallPilot

1002rp Server Hardware Installation

NN44200-300 01.01 Standard

5.0 23 February 2007

Copyright © 2007, Nortel Networks

Nortel Networks Conﬁdential

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Contents 1002rp Server Hardware Installation Trademarks Japan Denan statement Information for JapanJapan Vcci statement Page Publication History FebruaryPublication History Contents Contents Getting help over the phone from a Nortel Solutions Center Getting help from the Nortel Web siteGetting help through a Nortel distributor or reseller Server features Server dimensions and weightThis chapter IntroductionFront panel features front view without the front bezel Environmental speciﬁcationsAlarm board Rear panel diagramOverhead view of empty server showing PCI and ISA connectors Slot assignments Reference Documents1002rp server description Slot deﬁnition and slot numbering T1/SMDINetwork connectivity BRD20Sample network setup Meridian Sample network setup Communication ServerSwitch connectivity CallPilot Elan subnet and Nortel server subnet setupMeridian 1 or Communication Server 1000 systems Network requirementsRemote access connectivity Supported peripheral devicesDeviceDescription Installation overview Installation checklistPreparing for installation Conventions for warnings Unpacking the 1002rp server To unpack the equipmentRemoving the front bezel and server cover What is next?To remove the front bezel To remove the server cover Remove the front bezel see To remove the front bezelInspecting the server interior To inspect the server interiorTo replace the front bezel after installation is complete Installation and ConfigurationEnd Preparing for installation Safety information Safety precautionsEquipment handling guidelines About the power supply module Installing the second power supply module AC or DCAC versus DC systems To install the power supply module DC wire gauge tables AWGMetric wire conversion DC rack cablingPower supply installation Rack power and grounding About the power distribution unit DC power distribution rationalePDU power and grounding Multiple PDUsPDU terminal blocks and wiring diagram DC power inputBringing power and ground into the PDU To bring DC power and ground into the PDUInstalling the server To install the serverPreparing the modem Modem DIP switchesRequired equipment To set the modem DIP switches DIPContinue with Connecting peripherals to the server Connecting peripherals to the server To connect the modem to the server Media Access Control address Connecting the server to the Elan subnetTo connect the server to the Elan subnet Server will Connecting the server to the Nortel server subnet optional To connect the server to the Nortel server subnetTo install the software feature dongle Installing the Nortel software feature dongleRequirements Connecting the server to power Before you beginTo connect the 1002rp AC server to power Plug the server AC power cord into the server rear panelTo connect the 1002rp DC server to power To start the server Copyright 2007, Nortel Networks Ferrites secured to an external cable Index Index Tlan Index Page 1002rp Server Hardware Installation