HP D7171A - NetServer - LPr User manual

HP NetServer LH 4r Rack
Cabling Reference
HP Part Number D6969-90005
Printed in November 1998

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Notice
The information contained in this document is subject to change without notice.
Hewlett-Packard makes no warranty of any kind with regard to this
material, including, but not limited to, the implied warranties of
merchantability and fitness for a particular purpose. Hewlett-Packard shall
not be liable for errors contained herein or for incidental or consequential
damages in connection with the furnishing, performance, or use of this material.
Hewlett-Packard assumes no responsibility for the use or reliability of its software
on equipment that is not furnished by Hewlett-Packard.
This document contains proprietary information that is protected by copyright.
All rights are reserved. No part of this document may be photocopied,
reproduced, or translated to another language without the prior written consent of
Hewlett-Packard Company.
Windows®is a registered trademark of Microsoft in the U.S. and other countries.
CompuServe™is a U.S. trademark of CompuServe, Inc.
Hewlett-Packard Company
Network Server Division
Technical Marketing/MS 49EU-FQ
10995 Tantau Avenue
P.O. Box 58059
Santa Clara, CA 95104 USA
© Copyright 1998, Hewlett-Packard Company.
Audience Assumptions
This guide is for the person who installs, administers, and troubleshoots LAN
servers. Hewlett-Packard Company assumes you are qualified in the servicing of
computer equipment and trained in recognizing hazards in products with
hazardous energy levels.

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Contents
1 About This Cabling Reference.................................................................... 1
Introduction ................................................................................................... 1
Before You Use This Reference................................................................ 1
Purpose of This Document........................................................................ 1
Building an HP NetServer Rack..................................................................... 2
Suggested Method for Building an HP NetServer Rack Installation............ 2
Cabling Warnings and Cautions..................................................................... 8
Unterminated Power Cords Require Licensed Electrician.......................... 8
Prevent Electric Shock .............................................................................. 9
Prevent Damage to Components............................................................... 9
2 Connecting and Routing Cables to the HP NetServer LH 4r................... 11
Introduction ................................................................................................. 11
Overview of Cabling Steps ...................................................................... 11
The HP NetServer LH 4r ......................................................................... 11
Site Preparation........................................................................................... 12
Site Preparation Checklist....................................................................... 13
Site Preparation: Circuit Breakers............................................................ 15
Cabling Preparation for the HP NetServer LH 4r.......................................... 16
Assess How Components Will Be Connected to the Server..................... 16
Attach Cable Guide to Rack Column ....................................................... 16
Mount Power Distribution Units................................................................ 16
Attach Data Cables...................................................................................... 23
Plan Data Connections............................................................................ 23
Overview of LH 4r Data Cabling .............................................................. 23
Attach Data Cables to the Server ............................................................ 24
Attach Data Cables to Other Components............................................... 25
Attach Power Cables................................................................................... 26
Attaching Server and Component Power Cables..................................... 26
Determining Current Draw on Two Circuits in One Rack.......................... 27
Power Considerations for the HP NetServer LH 4r................................... 28
100/120V PDU Rack Power Configurations............................................. 29
200/208V PDU Rack Power Configurations............................................. 32
230/240V PDU Rack Power Configurations............................................. 35

Contents
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Cabling Two Power Supplies and High Density Configuration Examples. 38
Cable Routing: Creating the Cable Management Loop................................ 41
Power Up the Components in the Rack....................................................... 42
Power Up Sequence................................................................................ 42
Power Down Considerations.................................................................... 43
3 Cabling Reference Information................................................................. 45
Power Cords and Component Reference..................................................... 45
Wide-Ranging PDU Configurations.............................................................. 47
Power and Current for Estimating Supply Needs......................................... 49
Data Cabling Principles Used in Determining Rack Locations...................... 53
Key Cabling Guidelines Used in Developing a Rack Layout..................... 53
Placement Considerations Due to Data Cable Lengths............................ 53
Cooling Requirements for the HP NetServer LH 4r...................................... 54
Index............................................................................................................... 55

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1 About This Cabling Reference
Introduction
Before You Use This Reference
This cabling reference assumes that you have the rack assembly process
completed, have mounted the HP NetServer LH 4r, and are ready to cable the
components in the rack enclosure.
For instructions on how to install the HP NetServer LH 4r in a rack, consult the
installation guide or user guide shipped with your unit.
NOTE For instructions on how to assemble other components in a
rack, please find and follow the documentation shipped with
your rack components. Look for this documentation first
inside the rack. If there is no such documentation with your
rack, check the separately orderable installation kit. Or, use
the generic rack assembly process described in this chapter.
Purpose of This Document
This reference provides information for cabling the HP NetServer LH 4r,
including power consumption and current requirements. It is written for rack
installers who have installed the HP NetServer LH 4r in a rack and need
information about how to connect data and power cables. It contains:
•A review of the generic steps for building a rack installation
•Site preparation information
•Illustrations of electrical power components
•A diagram for use in connecting data cables between the HP NetServer
LH 4r and other system components
•Illustrations for installing Power Distribution Units (PDU) in the rack
•Power cabling information for rack-mounted electronic components
•Power, current, and component reference information

Chapter 1 About This Cabling Reference
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Building an HP NetServer Rack
Suggested Method for Building an HP NetServer Rack Installation
1. Check Site Preparation
Use the Site Preparation Checklist in Chapter 2 of this reference to be sure that
all necessary preparations have been completed, including:
•Assess floor’s levelness and strength
•Customer network and software responsibility met
•Site electrical power supply set-up complete
•Environmental and space requirements met
•Data and voice communications pre-tested
•System parameters correctly configured
•Hardware and cables order checked
2. Receiving
CAUTION Units are heavy, often weighing between 85 and 180 lb. (50
and 110 kg). Do not attempt to move or install such units
without help. Also, remove power supplies and hard disk
drives to minimize the amount of weight to be lifted.
Compare the order documents to the packing list or to a list of boxes received.
Check to see that all parts are present. Unpack the HP NetServer and external
storage and tape backup units (if any were ordered).
NOTE Save the boxes and packaging materials if you intend to reship
the units and rack.

Chapter 1 About This Cabling Reference
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3. Prepare Rack Enclosures for Assembly
WARNING A tip-over hazard exists. Rack enclosures are shipped upright
and are top-heavy. Never move enclosures without adequate
equipment and assistance. Use caution to prevent rack from
falling over and causing potential damage or injury.
If you receive pre-configured units, follow assembly instructions from the
supplying organization first, if you have them. Otherwise, continue with this set
of instructions.
Move Rack Enclosures and Other Units to Installation Location
WARNING Whenever you lift equipment, limit the amount of weight
each person picks up. Lift with your legs, not with your back.
Use two or more people and the proper equipment to move the rack enclosure,
server, mass storage units, and other components. Stage cartons a few feet from
your assembly and final power-up location.
Unpack Rack Enclosures and Hardware, Use Anti-Tip Measures, and Remove the
Shipping Panels
WARNING Use care in moving the rack down from the pallet. Three
people are required for this step.
1. Follow pictorial instructions on the outside of the shipping container to
unbox the rack enclosure.
2. Adjust the leveler feet, when present, under each of the four corners of
each rack. Lower each leveler foot to be in firm contact with the floor.
CAUTION The leveler feet prevent the rack from rolling away from you
when you install components. Be sure they have been lowered
before you put anything into the rack.
3. Find and extend the anti-tip foot under the rack (or bolt on the anti-tip
mechanism, if included) before you mount any rack equipment on slides.

Chapter 1 About This Cabling Reference
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WARNING When equipment is mounted on slides, a tip-over hazard
exists. Always take the precautions listed below:
Extend or bolt on the anti-tip foot for each rack before
mounting equipment on slides.
Never extend more than one piece of equipment on slides at
time.
Reduce weight by removing power supplies and hard disk
modules from servers.
Always use the rack mounting handles that are shipped on
rack optimized units as shown in accompanying instructions.
4. Removeany shipping panels from inside the rack enclosure. Save panels,
screws, and rack nuts if you are going to reship the rack.
Unpack Remaining Components
Unpack each component in the order in which you assemble them (from the
bottom of the rack upward). Each package contains rack installation instructions
or a user guide.
NOTE If an Uninterruptible Power Supply (UPS) is included, plug it
in as soon as you unbox it. Doing so helps ensure batteries are
charged when rack installation is completed.
4. Build Basic Rack Assembly
Position, Tie Together, and Open Up the Rack
1. Determine how rack bays are to be positioned. If two or more racks are to
be tied together, use the optional tie-together kit. Otherwise, skip this step.
Newer models may be tied together before or after equipment is mounted
in them. Follow instructions included with tie together hardware.

Chapter 1 About This Cabling Reference
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NOTE HP Rack System product numbers J1487B, J1487B option
AXH, and J1488A require that enclosures to be tied together
before any components are mounted inside them. To avoid
problems, if these rack versions are to be tied together, do so
before installing slide members, rails, shelves, units, or other
hardware. Otherwise, you may have to remove components
from the rack to gain access to the tie-bolt locations.
2. If present, remove the front and rear doors to increase accessibility inside
the rack. Follow instructions shipped with the rack to do so.
NOTE HP Rack System product numbers J1487B, J1487B option
AXH, and J1488A require door hardware to be in place before
mounting components. If you are using front or rear doors, be
sure the hinge and latch hardware is mounted before putting
on any other hardware. This prevents later disassembly.
WARNING When the back door of a rack is removed, the latch catch
bracket protrudes. To avoid injury, temporarily remove this
bracket prior to installing components into the rear of the
rack.
3. If present, remove side panels to allow better access. Follow instructions
shipped with the rack to do so.
Install Fans If Required and UPS First If You Have Them
1. If an extractor fan unit is to be used, install it following instructions which
accompany the unit.
NOTE If your server has an internal fan system, your rack doors must
be perforated (front and/or rear). In this case, you do not need
an extractor fan.
2. If an Uninterruptible Power Supply (UPS) is used, install the UPS
mounting rails and fasten the unit into place following instructions which
accompany it. Place the UPS equipment in the lowest EIA Units of the
rack. Plug the UPS in to charge the batteries as soon as possible.

Chapter 1 About This Cabling Reference
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5. Mount Component in the Rack
Plan Component Locations
Use the original ordering information to locate where each component goes in
the rack.
If the original ordering information is not available, use HP rack configuration
tools to plan the location of each component.
You can also use the HP NetServer rack configuration tools (for instance, HP
Rack Assistant) to make ordering easier and to automatically check that orders
are complete. These tools can be found on the HP web site. Use a Web browser to
got to the following URL:
http://www.hp.com/go/netserver
Then, use the Search function with the words "rack configuration tools."Find one
of the following in the list of Search responses: "Ordering NetServers,""Select a
Configuration,""Configuration Software,"or "Rack Assistant."
Mount Each Unit in the Rack Enclosure
1. Position each unit following the original layout used to order the server.
Follow the instructions which accompany each component. If you do not
have the original layout, you can use HP rack configuration tools,
available at HP’s web site, to regenerate it.
2. Rack-optimized HP NetServer and mass storage unit have instructions in
their user or installation guides for mounting the units in the rack
enclosure. For other servers and storage units, rack mounting instructions
are included with optional rack-mount kits, if available. See the user or
installation guide or rack-mount kit instruction sheet which accompanies
your unit for details.
CAUTION To prevent rack tip-over, extend or bolt on the anti-tip foot
before installing units on sliding members. Also prevent rack
tip-over by extending only one piece of equipment at a time
from the front or rear of the rack.
3. Begin at the bottom of the rack, installing the rack mount kit for the first
component. Install the UPS first, if you have one.
NOTE For both safety and accessibility, always start assembly at the
bottom of the rack and work upward.

Chapter 1 About This Cabling Reference
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4. Be sure to locate and place rack nuts along the front outside face of the
vertical column before placing each component on its rails or base. The
pre-positioning of rack nuts allows the front of the component to be
secured to the front of the rack. (Some units use threaded inserts or bar
nuts, and require no rack nuts to secure the unit to the rack.)
5. Mount each unit on its accompanying rails, brackets, or slides.
CAUTION Tip-over hazard exists. Servers are heavy and may be
awkward to position on their mounting rails. Therefore,
always minimize the weight to be mounted into the rack by
removing power supplies and hard disk modules.
Once each component is correctly secured in the rack, add the front panel
(bezel) to the unit.
Proceed with units one by one, from the bottom of the rack to the top. Fill
any gaps with spacer panels.
6. Connect and Route Cables
NOTE Illustrated information about cabling the HP NetServer LH 4r
in the rack is available in Chapter 2 of this Reference, which
describes the procedures for connecting and routing cables.
Generally, follow these steps to ensure cables are correctly connected and
managed:
Cable management preparation
•Determine which components will be connected to each server.
•Attach cable guides to the rack column. See instructions included with
cable guides.
•Mount Power Distribution Unit (PDU) or Units.
Attach data cables
•Plan where data connections are to be made.
•Attach data cables to the server. Mark the ends of data cables with colored
tie-wraps and labels that come along with each server. This simplifies
attaching cables later in the procedure.

Chapter 1 About This Cabling Reference
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•Create a cable management loop by providing sufficient cable length to
allow servers to be extended from the rack for maintenance.
•Attach data cables to their respective components.
Attach power cables
•Connect each component to a Power Distribution Unit (PDU) or Units.
•Connect PDU and Uninterruptible Power Supply (UPS)--if present--cables
to Branch Circuits.
Route and tie cables
•Route cables through cable guide and tie wrap them in place.
Power on the components in the rack.
•Follow the power up sequence. See"Power Up Sequence"in Chapter 2.
7. Configure the System, Install Doors and Side Panels
At this point, refer to the NetServer user or installation manual and configure the
system.
Install front and rear doors as required, and mount side panels. Follow the
detailed instructions and illustrations that are included with the rack enclosure
and components.
Cabling Warnings and Cautions
Unterminated Power Cords Require Licensed Electrician
In some cases in the 230/240V environment, the Uninterruptible Power Supply
(UPS) is shipped with a power cord that is unterminated. The reason is that the
current demand of a fully loaded rack may exceed the demand for the normal
circuit in some countries. Therefore, you should have a qualified electrician or
electrical engineer analyze the current demand for each branch circuit used by
rack mounted equipment. Proper wiring and cord termination are part of the
same process.

Chapter 1 About This Cabling Reference
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Prevent Electric Shock
WARNING Ensure site electrical circuits have reliable earth grounding.
Never operate products in any rack enclosure with the ground
connector disconnected. Although leakage current from any
one device may be minimal, cumulative leakage current of
equipment mounted in a rack may exceed 5mA, and could
reach 15mA. This level of current can be dangerous, unless a
reliable earth ground is in place. Thus, reliable ground
circuit continuity is vital to safe operation of this system.
WARNING Prevent shock hazard by disconnecting power and telephone
cords when you service or install components.
Prevent Damage to Components
CAUTION Rack optimized products are sensitive to static electricity
(ESD). When installing components, take precautions against
ESD damage. Wear a wrist-strap and use a static-dissipating
work surface connected to the server chassis when handling
printed circuit boards, memory devices, and processor chips
or modules. Ensure that the metal of the wrist-strap contacts
your skin and that the alligator clip is attached to a static-
neutral surface.
CAUTION Power up the components one at a time. Turning on an entire
rack at one time may create damaging and dangerous
electrical surges that could trip circuit breakers in the system.
Follow instructions in the section titled "Power Up Sequence"
to minimize current inrush.

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2 Connecting and Routing Cables to
the HP NetServer LH 4r
Introduction
Overview of Cabling Steps
This chapter includes information on cabling the server and other components in
a rack, including:
•Site preparation
•Cabling preparation for data and power
•Attach data cables
•Attach power cables
•Cable routing and management
•Power on the equipment in the rack
The HP NetServer LH 4r
This cabling reference is for the rack optimized HP NetServer LH 4r shown in
Figure 2-1.

Chapter 2 Connecting and RoutingCables to the HP NetServer LH 4r
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Figure 2-1. The Rack Optimized HP NetServer LH 4r
Site Preparation
You may want to copy and use the site preparation checklist in this section with a
representative of the organization installing the rack. Doing so before you begin
may reveal actions you can take to support your success.

Chapter 2 Connecting and Routing Cables to the HP NetServer LH 4r
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Site Preparation Checklist
Table 2-1. Site Preparation Checklist
HP NetServer Customer Responsibilities
Logical and physical network design provided.
Server configuration parameters determined.
Disk partition and directory structure determined.
Required incoming power and data cabling in place.
Working LAN, one working client, one working printer available (if integrating into an
existing network).
Software license requirements met.
Networking peripherals connected.
Security
The HP NetServer LH 4r must be installed only in locations where access is restricted to
technically qualified personnel.
Use the locks on rack doors to secure the HP NetServer LH 4r control panel and rear ports.
Floor
Ensure the floor where the NetServer rack is to be installed is level.
Assess floor strength and ensure it is sufficient to support the type of rack you have
ordered. (See the rack documentation included with your rack.)
Ensure sufficient area to accommodate your rack, including up to 24 inches (60 cm) rear
door clearance.
Power
Correct size, type, and rating of receptacles, circuits, and circuit breakers; see the section
titled "Site Preparation: Circuit Breakers."
Locate close enough to power sources so that power cords will reach.
If raised floor, need floor tile(s) with a cutout for cables, all posts electrically grounded.
Facility for grounding each rack to earth connection, ensure earth ground continuity for
circuits to be used for rack mounted equipment.

Chapter 2 Connecting and RoutingCables to the HP NetServer LH 4r
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Table 2-1. Site Preparation Checklist (Continued)
Environment and Space Requirements
In the United States, must meet OSHA code. Elsewhere, must meet local code and HP
specifications for safety and supportability. (A 3-foot--90 cm--minimum access in front
and rear of electrical cabinets is required.)
Side access of 24 inches (60 cm) improves cable routing and management.
24 hour air conditioning (68 - 72 deg. F; 20 - 22 deg. C, 40 - 60% RH).
Table or work space big enough for console terminal and user guides.
Bookshelf for documentation.
Area to store equipment until time of installation.
Ensure all equipment and/or shipping pallets can fit through doorways, hallways, and into
and out of elevators.
Data and Voice Communications (Pre-Tested and Verified)
Voice phone located at system console terminal with cord long enough to reach all parts of
the rack installation.
Phone line for remote support at each system.
Ethernet, FDDI, Token Ring, or other standard.
System Parameters
Hostname
IP address
Subnet Mask
Gateway IP Address
Gateway Host Name
DTC Node Name
Hardware Configuration, Cables, and so on
Availability of I/O paths and SCSI addresses for add-on devices.
Availability of I/O backplane slots, memory slots, and so on.
Valid, supportable configuration for added devices, interfaces, memory, and so on.
Correct type and length of cables, as specified in order documents.

Chapter 2 Connecting and Routing Cables to the HP NetServer LH 4r
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Site Preparation: Circuit Breakers
When you connect the HP NetServer LH 4r to an AC power source, the server
temporarily draws a large "inrush current."This occurs even when the system is
in standby mode. Inrush current is much greater than the server’s normal
operating needs. Generally, your external AC power source can handle the inrush
current.
If you install several HP NetServers on one circuit, however, precautions are
necessary. For instance, if there is a power failure and power is then restored, all
the servers immediately begin to draw inrush current at the same time. If the
circuit breakers on the incoming power line have insufficient capability, they may
trip and thus prevent the servers from powering up.
When preparing your site for installation, allow for the additional inrush current.
Consider the following before installing the server in your environment:
•In North America, a 20-amp-minimum circuit is to be used with one
NEMA AB1 class 14B breaker for each 16-amp Power Distribution Unit
that is to be connected to an HP NetServer LH 4r.
•In Europe:
◊For a single LH 4r unit in a rack, use a 16-amp-minimum circuit with
one IEC MCB C-type breaker for each 16-amp Power Distribution
Unit.
◊For multiple LH 4r units in a rack, use a 16-amp-minimum circuit
with one IEC MCB D-type breaker for each 16-amp Power
Distribution Unit.
NOTE Some local codes do not allow a 16-amp device to be
connected to a 16-amp service. Consult a qualified electrician
or local regulatory authority before beginning electrical site
preparation.

Chapter 2 Connecting and RoutingCables to the HP NetServer LH 4r
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Cabling Preparation for the HP NetServer LH 4r
Assess How Components Will Be Connected to the Server
You may find the following steps helpful before you begin cabling.
•Review the layout of the rack installation generated with HP’s rack
configuration tools. (See Step 2 in Chapter 1 for more information.)
•Consider the cabling guidelines discussed in Chapter 3, in the section
"Data Cabling Principles Used in Determining Rack Locations."
Attach Cable Guide to Rack Column
Using the instructions included, attach the cable guide(s) to the rack column.
You may position them horizontally between the rack columns or vertically along
the outside edge of the column. (Do not, however, mount them horizontally
behind units listed in Table 2-2.
See Figure 2-7 for an illustration of the rear of the rack after cable guides have
been installed. Newer rack models have threaded inserts on the outside edges of
the vertical columns for use in mounting cable guides. When mounting PDUs on
older rack models or horizontally mounting them in any rack, use rack nuts to
secure them in place.
NOTE Vertically mounted cable guides are always mounted on the
same side at the rear of the rack as the door hinge hardware.
Door hinges are shipped on the left side of the rack. Users may
choose to exchange hinge hardware so doors open oppositely.
If so, cable guides should be repositioned on the same side as
the rear door hinge.
Mount Power Distribution Units
Plan the location of the Power Distribution Unit or Units (PDU) by reference to
amperage, power, and the number of receptacles. See Chapter 3, the section titled
"Wide-Ranging PDU Configurations,"particularly Table 3-2.