NEC N8141-75F User manual

N8141-75F
2U Device Expansion Unit
User's Guide
Welcome to the N8141-75F 2U Device Expansion Unit.
Read this User’s Guide and the User’s Guide that comes with the NEC Express Server
thoroughly to fully understand the handling of the N8141-75F 2U Device Expansion
Unit .Always read the Notes on Safety before using the N8141-75F 2U Device
Expansion Unit. After reading this User’s Guide, keep it carefully in an area where you
can see it easily.

PROPRIETARY NOTICE AND LIABILITY DISCLAIMER
The information disclosed in this document, including all designs and related materials, is
the valuable property of NEC Corporation (NEC) and /or its licensors. NEC and/or its
licensors, as appropriate, reserve all patent, copyright and other proprietary rights to this
document, including all design, manufacturing, reproduction, use and sales rights thereto,
except to the extent said rights are expressly granted to others.
The NEC product(s) discussed in this document are warranted in accordance with the
terms of the Warranty Statement accompanying each product. However, actual
performance of each such product is dependent upon factors such as system configuration,
customer data, and operator control. Since implementation by customers of each product
may vary, the suitability of specific product configurations and applications must be
determined by the customer and is not warranted by NEC.
To allow for design and specification improvements, the information in this document is
subject to change at any time, without notice. Reproduction of this document or portions
thereof without prior written approval of NEC is prohibited.
Printing, January 2015
Copyright 2015
NEC Corporation
7-1 Shiba 5-Chome, Minato-Ku
Tokyo 108-8001, Japan
All Rights Reserved
Printed in Japan

- i -
Momentary voltage drop prevention
This product may be affected by a momentary voltage drop caused by lightning. To prevent
a momentary voltage drop, an AC uninterruptible power supply (UPS) unit should be used.
FCC Statement
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction manual,
may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.
Industry Canada Class A Emission Compliance Statement
This Class A digital apparatus complies with Canadian ICES-003.
Avis de conformité à la réglementation d'Industrie Canada
Cet appareil numérique de la classe A est conforme à la norme NMB-003 du Canada.
CE / Australia and New Zealand Statement
This is a Class A product. In domestic environment this product may cause radio
interference in which case the user may be required to take adequate measures
(EN55022).

- ii -
Turkish RoHS information relevant for Turkish market
EEE Yönetmeliğine Uygundur
注意：安装好滑轨后的装置，禁止做为置物架或者作业空间来使用
注意：安裝好滑軌後的裝置，禁止做為置物架或作業空間來使用
Vietnam RoHS information relevant for Vietnam market
Complying with “CIRCULAR,No.30/2011/TT-BCT（Hanoi,August 10 2011）,
Temporary regulations on content limit for certain hazardous substances in
electrical products”
The e-waste (Management and Handling)Rules,2011.
This product is RoHS compliant
Disposing of your used product
In the European Union
EU-wide legislation as implemented in each Member State requires that used
electrical and electronic products carrying the mark (left) must be disposed of
separately from normal household waste. This includes Information and
Communication Technology (ICT) equipment or electrical accessories, such
as cables or DVDs.
When disposing of used products, you should comply with applicable
legislation or agreements you may have. The mark on the electrical and
electronic products only applies to the current European Union Member
States.
Outside the European Union
If you wish to dispose of used electrical and electronic products outside the
European Union, please contact your local authority and ask for the correct
method of disposal.

- iii -
Declaration of Conformity
with the requirements of Technical Regulation on the Restriction Of the use of certain Hazardous
Substances in Electrical and Electronic Equipment
(adopted by Order №1057 of Cabinet of Ministers of Ukraine)
The Product is in conformity with the requirements of Technical Regulation on the Restriction Of the use
of certain Hazardous Substances in electrical and electronic equipment (TR on RoHS).
The content of hazardous substance with the exemption
of the applications listed in the Annex №2 of TR on RoHS:
1. Lead (Pb) – not over 0,1wt % or 1000wt ppm;
2. Cadmium (Cd) – not over 0,01wt % or 100wt ppm;
3. Mercury (Hg) – not over 0,1wt % or 1000wt ppm;
4. Hexavalent chromium (Cr6+) – not over 0,1wt % or 1000wt ppm;
5. Polybrominated biphenyls (PBBs) – not over 0,1wt % or 1000wt ppm;
6. Polybrominated diphenyl ethers (PBDEs) – not over 0,1wt % or 1000wt ppm.
Декларація про Відповідність
Вимогам Технічного Регламенту Обмеження Використання деяких Небезпечних Речовин в
електричному та електронному обладнанні
(затвердженого Постановою №1057 Кабінету Міністрів України)
Виріб відповідає вимогам Технічного Регламенту Обмеження Використання деяких Небезпечних
Речовин в електричному та електронному обладнанні (ТР ОВНР).
Вміст небезпечних речовин у випадках, не обумовлених в Додатку №2 ТР ОВНР, :
1. свинець(Pb) – не перевищує 0,1 % ваги речовини або в концентрації до 1000 частин на
мільйон;
2. кадмій (Cd)– не перевищує 0,01 % ваги речовини або в концентрації до 100 частин на
мільйон;
3. ртуть(Hg) – не перевищує 0,1 % ваги речовини або в концентрації до 1000 частин на
мільйон;
4. шестивалентний хром (Cr6+ ) – не перевищує 0,1 % ваги речовини або в концентрації до
1000 частин на мільйон;
5. полібромбіфеноли (PBB) – не перевищує 0,1% ваги речовини або в концентрації до 1000
частин на мільйон;
6. полібромдефенілові ефіри (PBDE) – не перевищує 0,1 % ваги речовини або в концентрації
до 1000 частин на мільйон.
Декларация о Соответствии
Требованиям Технического Регламента об Ограничении Использования некоторых Вредных
Веществ в электрическом и электронном оборудовании
(утверждённого Постановлением №1057 Кабинета Министров Украины)
Изделие соответствует требованиям Технического Регламента об Ограничении Использования
некоторых Вредных Веществ в электрическом и электронном оборудовании (ТР ОИВВ).
Содержание вредных веществ в случаях, не предусмотренных Дополнением №2 ТР ОИВВ:
1. свинец (Pb) – не превышает 0,1 % веса вещества или в концентрации до 1000 миллионных
частей;
2. кадмий (Cd) – не превышает 0,01 % веса вещества или в концентрации до 100 миллионных
частей;
3. ртуть (Hg) – не превышает 0,1 % веса вещества или в концентрации до 1000 миллионных
частей;
4. шестивалентный хром (Cr6+)– не превышает 0,1 % веса вещества или в концентрации до
1000 миллионных частей;
5. полибромбифенолы (PBB) – не превышает 0,1 % веса вещества или в концентрации до
1000 миллионных частей;
6. полибромдифеноловые эфиры (PBDE) – не превышает 0,1 % веса вещества или в
концентрации до 1000 миллионных частей.

- iv -
依据电子信息产品污染控制管理方法的规定，本设备中存在的6种有毒有害物质或元素的信息如
下所示。请妥善保存本资料。转让（或出售）本设备时，请将此资料一并交予第三方。
有毒有害物 质或元素的名称及含量
部品名称
有毒有害物质或元素
铅
(Pb)
汞
(Hg)
镉
(Cd)
六价铬
(Cr(VI))
多溴联苯
(PPB)
多溴二苯醚
(PBDE)
印刷线路板
×
○
○
○
○
○
磁帯装置
×
○
○
○
○
○
机箱、支架
○
○
○
○
○
○
电源
×
○
○
○
○
○
其他（电缆等）
×
○
○
○
○
○
○：表示该有毒有害物质在该部件所有均质材料中的含量均在 SJ/T11363-2006 标准规定的限量要求以下。
×：表示该有毒有害物质至少在该部件的某一均质材料中的含量超出 SJ/T11363-2006 标准规定的限量要求。
This only applies to China.
Trademarks
Linear Tape-Open, LTO, Ultrium Tape Drive are registered trademarks of Hewlett-Packard Company,
IBM and Quantum in the United States and other countries.
All other product, brand, or trade names used in this publication are the trademarks or registered
trademarks of their respective trademark owners.
Names used with sample applications are all fictitious. They are unrelated to any existing product names,
names of organizations, or individual names.
Notes:
(1) No part of this manual may be reproduced in any form without prior written permission of NEC
Corporation.
(2) The contents of this User's guide may be revised without prior notice.
(3) The contents of this User’s Guide shall not be copied or altered without prior written permission
of NEC Corporation.
(4) All efforts have been made to ensure the accuracy of all information in this User’s Guide. If you
notice any part unclear, incorrect, or omitted in this User’s Guide, contact the sales agent where
you purchased this product.
(5) NEC assumes no liability arising from the use of this product, nor any liability for incidental or
consequential damages arising from the use of this User’s Guide regardless of Item (4).

- v -
PACKING LIST
Check the contents in the carton.
The carton contains various accessories, as well as the Device Expansion Unit itself. See
the packing list to make sure that you have everything and that individual components are
not damaged. If you find any components missing or damaged, contact your sales agent.
When the N8141-75F 2U Device Expansion Unit is shipped with some options installed,
the accessories for the options are contained additionally.
Main unit
Contents in the accessory package
User's Guide
(This manual)
Rack Rail
Latching Rail
x
4set
(Inside Unit)
Screw A
(
M5 millimeter
Screw) (8)
Start Up Guide
Screw B
(
M4 millimeter
Screw
) (6)
Washers (8)
CD (User’s Guide)

- vi -
PRECAUTIONS FOR USE (BE SURE TO READ)
Be sure to read this Safety Precautions carefully before using this product and retain it for
reference.
Safety Precautions
This document provides information required to your product safely and properly.
Keep this document nearby so that you may use refer to it as necessary.
This Safety Precautions describes the device components with possible danger, hazards that may
be caused by ignoring warnings, and preventive actions against such hazards.
Components with possible danger are indicated with a warning label placed on or around them. In
the User's Guide or warning labels, "WARNING" or "CAUTION" is used to indicate a degree of
danger. These terms are defined as follows:
WARNING
Indicates there is a risk of death or serious personal injury
CAUTION
Indicates there is a risk of burns, other personal injury, or property damage
Precautions and notices against hazards are presented with one of the following three symbols. The
individual symbols are defined as follows:
This symbol indicates the presence of a hazard.
An image in the symbol illustrates the hazard type. (Attention)
This symbol indicates prohibited actions. An image in the symbol illustrates a
particular prohibited action. (Prohibited Action)
This symbol indicates mandatory actions. An image in the symbol illustrates a
mandatory action to avoid a particular hazard. (Mandatory Action)
(Example)
A term indicating a degree of danger
CAUTION
High temperature.
Immediately after the server is powered off, its internal components
such as hard disks are very hot. Leave the server until its internal
components fully cool down before installing/removing any component.
Symbol to draw attention
Description of warning

- vii -
SYMBOLS USED IN THIS USER'S GUIDE AND WARNING LABELS
Attentions
Indicates that improper use may cause an electric shock.
Indicates that improper use may cause personal injury due to high temperature.
Indicates that improper use may cause personal injury.
Indicates that improper use may cause fingers to be caught.
Indicates that improper use may cause fumes or fire.
Indicates a non-particular notice or warning.
Indicates that improper use may cause explosion.
Indicates the presence of laser beam that cause blindness.
Prohibited Actions
Indicates a non-particular and mandatory action.
Do not disassemble, repair, or modify the Device Expansion Unit. Otherwise, an
electric shock or fire may be caused.
Do not touch any component other than specified. Otherwise, an electric shock or
personal injury such as burns may be caused.
Do not touch the Device Expansion Unit with wet hands. Otherwise, an electric shock
may be caused.
Keep away from water or liquid. Otherwise, an electric shock or fire may be caused.
Do not place the product near the fire. Otherwise, a fire may be caused.
Mandatory Action
Unplug the power cord of the Device Expansion Unit. Otherwise, an electric shock or
fire may be caused.
Indicates a non-particular and mandatory action. Make sure to follow the instruction.
Be sure to provide earthing. Otherwise, an electric shock or fire may be caused.

- viii -
NOTES ON SAFETY
To enable you to use the Device Expansion Unit safely, read the notes described below
carefully to understand them. See "Safety Precautions" described earlier for the
descriptions of symbols.
General
WARNING
Do not use the Device Expansion Unit for services involving human lives or
requiring high reliability.
The Device Expansion Unit is not intended to be used with or control facilities
or devices concerning human lives, including medical devices, nuclear facilities
and devices, aeronautics and space devices, transportation facilities and
devices; and facilities and devices requiring high reliability. NEC assumes no
liability for any accident resulting in personal injury, death, or property damage
if the Device Expansion Unit has been used in the above conditions.
Do not use the Device Expansion Unit in any unapproved place.
Install the Device Expansion Unit on a standard EIA 19-inch rack assembly for
NEC Express server. Do not install the rack containing the Device Expansion
Unit in a place inappropriate to the rack installation environment.
Failure to follow these instructions may cause some bad influences to be
imposed on the Device Expansion Unit and other systems installed on the rack
and also a fire or personal injury due to falling of the rack may occur. For the
detailed explanation on the place where the rack should be installed and the
earthquake-resistant construction for the rack, refer to the manual attached to
the rack or contact you sales agent.
Always install the Device Expansion Unit on a rack for NEC Express server,
conforming to the relevant standard.
Install the Device Expansion Unit on a rack confirming to the EIA standard for
the server to be used. Do not use the Device Expansion Unit with installed on
any other rack than standard EIA 19-inch rack or without the installation on a
proper rack. Failure to follow these instructions may cause the Device
Expansion Unit to operate incorrectly and/or personal injury or damages of
surrounding devices to occur. Contact your sales agent for the racks available
for the Device Expansion Unit.
Do not use the Device Expansion Unit if any smoke, odor, or noise is present.
If smoke, odor, or noise is detected, immediately turn off the POWER switch
and disconnect the power plug from the outlet (turning off the power of the NEC
Express server can have the power of the Device Expansion Unit to be turned
off). Then contact your sales agent. Using the Device Expansion Unit in such
conditions may cause a fire.
Do not insert needles or metal objects.
Do not insert needles or metal objects into ventilation holes in the Device
Expansion Unit or openings in the hard disk drive. Doing so may cause an
electric shock.

- ix -
CAUTION
Keep water or foreign objects away from the Device Expansion Unit.
Do not let any form of liquid (water etc.) or foreign objects (e.g., pins or paper
clips) enter the Device Expansion Unit. Failure to follow this warning may
cause an electric shock, a fire, or a failure of the Device Expansion Unit. If any
of the above mentioned objects accidentally enters the Device
Expansion Unit,
immediately turn off the power and disconnect the power plug from the outlet.
Do not disassemble the Device Expansion Unit. Contact your sales agent.
Protect the equipment from extremely low or high temperature.
Protect the equipment from extremely low or high temperature. Let the system
warm (or cool) to room temperature before using it.
The Maximum Recommended Ambient Operating Temperature (TMRA) for the
Device Expansion Unit is 35 degrees C.

- x -
Power Supply and Power Cord Use
WARNING
Do not hold the power plug with wet hands.
Do not disconnect/connect the plug while your hands are wet. Failure to follow
this warning may cause an electric shock.
Do not remove or defeat the ground prong on the power cord.
This equipment has a 3-wire and grounded power code. To prevent electrical
hazards, do not remove or defeat the ground prong on the power cord.
Do not connect the ground wire to a gas pipe.
Do not connect the ground wire to a gas pipe. Failure to follow this warning may
cause a gas explosion.
If you disconnect the power, disconnect the two power lines.
The product might be powered from 2 AC power lines. If you disconnect the
power from the device, both 2 power sources must be disconnected. It may
cause an electric shock if the power is not disconnected properly.
CAUTION
Plug into a proper power source.
Use a grounded outlet with the specified voltage.
Use of an improper power source may cause a fire or leakage current.
Do not install the Device Expansion Unit in any environment that requires an
extension cord.
Use of a cord that does not meet the power specifications of the Device
Expansion Unit may heat up the cord and cause a fire.
Do not connect too many cords into a single outlet by using power boards, etc.
The electric current exceeding the rated flow of the outlet may cause
overheating and result in fire.
Completely insert the power plug into the outlet.
Heat generation resulting from a halfway inserted power plug (imperfect
contact) may cause a fire. If accumulated dust on the prongs of a
halfway-inserted plug absorbs liquids such as water droplets formed by the
condensation of vapor, heat will also be generated and a fire may occur.

- xi -
CAUTION
Do not use a power cord other than those specified.
May cause a fire when the electric current of the power cord exceeds the rated
flow.
Also, observe the following to prevent an electric shock or fire caused by a
damaged cord.
Do not stretch the cord harness.
Do not pinch the power cord.
Do not bend the power cord.
Keep chemicals away from the power cord.
Do not twist the power cord.
Do not place any object on the power cord.
Uncoil the power cord before use.
Do not alter, modify, or repair the power cord.
Do not secure the power cord with staples or equivalents.
Do not step on the power cord.
Do not use any damaged power cord. (Replace a damaged
power cord with
a new one of the same specifications. Ask your sales agent for
replacement.)
Rack mounted equipment marking – Slide/rail marking
CAUTION
Slide/rail mounted equipment is not to be used as a shelf or a work
space.
Multiple power sources
CAUTION
Disconnect all power supply cords before servicing.

- xii -
Notes on Installing and Accessing the Rack Cabinet
CAUTION
Do not carry or install the rack only by a single person.
More than one person is required to carry or install the rack. Failure to follow
this instruction may cause the rack to fall and result in personal injury and/or
breakage of surrounding devices. In particular, a high rack is unstable if it is
not fixed by stabilizers. More than one person must always carry or install the
rack while they support it.
Do not install with the load weight distributed unevenly
To avoid unevenly distributing the load of the rack and device, install a
stabilizer or connect multiple racks to distribute the weight. Otherwise, the
rack may fall, resulting in personal injury.
Do not install components on the rack only by yourself.
Two or more people are required to install the rack components such as the
door or rails. When installing the door, make sure that both upper and lower
hinge pins are held in place. Failure to follow this instruction not only may
cause some parts to fall but may also be broken and result in personal injury.
Do not pull out a device from the rack if the rack is unstable.
Always pull out a device from the rack in the state that the rack is made stable
(by the installation of stabilizers or earthquake-resistant construction).
Failure to follow this instruction may cause the rack to fall out and result in
personal injury.
Do not extend more than one device out of the rack.
Extending multiple devices from the rack may cause the rack to fall, resulting
in personal injury. Extend only one device at one time.
When wiring the rack, be sure not to exceed the rating of the power supply.
To prevent burns, fires, and device damages, the power supplied to the power
supply in the rack shall not exceed the rating load of the power branch circuit.
Contact the local power company for the requirements on the wiring and
installation of electric facilities.

- xiii -
CAUTION
Elevated Operating Ambient
If installed in a closed or multi-unit rack assembly, the operating ambient
temperature of the rack environment may be greater than room ambient.
Therefore, consideration should be given to installing the equipment in an
environment compatible with the maximum ambient temperature (Tma)
specified by the manufacturer.
Reduced Air Flow
Installation of the equipment in a rack should be such that the amount of air
flow required for safe operation of the equipment is not compromised.
Mechanical Loading
Mounting of the equipment in the rack should be such that a hazardous
condition is not achieved due to uneven mechanical loading.
Circuit Overloading
Consideration should be given to the connection of the equipment to the supply
circuit and the effect that overloading of the circuits might have on overcurrent
protection and supply wiring. Appropriate consideration of equipment
nameplate ratings should be used when addressing this concern.
Reliable Earthing
Reliable earthing of rack-mounted equipment should be maintained. Particular
attention should be given to supply connections other than direct connections
to the branch circuit (e.g., use of power strips).

- xiv -
Installation, Relocation, Storage, and Connection
CAUTION
Do not attempt to lift the Device Expansion Unit only by yourself.
The Device Expansion Unit weighs max. 20 kg (depending on its hardware
configuration). Always get more than one persons or use the lifter to install,
disassembly, or carry the Device Expansion Unit. Carrying out these actions only
by yourself may strain your back or drop the chassis to cause personal injury or
damage of surrounding devices. Lift the Device Expansion Unit by firmly holding
its
bottom with other person.
Do not install the Device Expansion Unit in any place other than specified.
Do not install the Device Expansion Unit in the following places or any place other
than specified in this User's Guide. Failure to follow this instruction may cause a
fire.

a dusty place

a place exposed to direct sunlight

a humid place such as near a boiler

an unstable place
Do not install the Device Expansion Unit on rack with leaving covers removed.
Do not install the Device Expansion Unit on a rack with the cover being removed.
Failure to follow this instruction not only may decrease the cooling effect in the
Device Expansion Unit and result in some malfunction, but may also allow dusts to
enter the Device Expansion Unit and result in a fire or electric shock.
Be careful not to get your fingers caught in the rails or other components.
When mounting/removing the device onto/from the rack, be careful to avoid getting
your fingers caught in the rails or cutting your fingers on the rails.
Do not attempt to connect or disconnect the interface cable while the power cord is
plugged into an outlet.
Make sure to power off the Device Expansion Unit and unplug the power cord from
the power outlet before connecting/disconnecting the interface cable. If the Device
Expansion Unit is powered off but its power cord is plugged to a power source,
touching the cable may cause an electric shock or a fire resulted from a short
circuit. Also, connect/disconnect the interface cable after turning off the power of
the destination.
Do not use any unauthorized interface cable.
Use only interface cables provided by NEC and locate a proper device and a proper
connector before connecting a cable. Using an authorized cable or connecting a
cable to an improper destination may cause a short circuit, resulting in a fire.
Also, observe the following notes on using and connecting an interface cable.

Do not use any damaged cable connector. Before connecting an interface cable, confirm
that any cable connector is not damaged and any connector pin is not bent or dirt.
Do not step on the cable.
Do not use the Device Expansion Unit with loose cable connections.
Do not place any object on the cable.
Do not use the Device Expansion Unit with loose interface cable connections. After
connecting the interface cable, secure it with a screwdriver
or equivalent. To disconnect the
interface cable, release the secured part and hold the connector and pull it straight out.

- xv -
WARNING
Do not close the ventilation hole.
Do not close fan or the front ventilation hole at the back of the Device
Expansion Unit. Otherwise, its internal temperature will rise to cause
malfunctions or a fire.
Do not apply any weight on the Device Expansion Unit when it is extended from
the rack
Do not apply any weight on the Device Expansion Unit when it is extended from
the rack. Doing so may cause the frames to be bent
, which makes it impossible
to be mounted on the rack. It also may cause the Device Expansion Unit to fall,
resulting in personal injury.
Do not use the equipment in the place where corrosive gases exist.
Do not install the Device Expansion Unit in a place subject to corrosive gases
including sulfur dioxide, hydrogen sulfide, nitrogen dioxide, chlorine, ammonia,
and ozone. Do not install the Device Expansion Unit in an environment that
contains dusts or chemicals that accelerate corrosion such as sodium chloride,
sulfur, and conductive materials. Failure to follow this warning may cause the
wires on the printed wiring board to short circuits, leading to fire. If you have
any questions, contact the store where you purchased the product or a
maintenance service company.
Do not work in the state installed to the rack.
Do not work in the state installed to the rack. Failure to follow this warning
may cause an electric shock. Please work after removing from the rack.

- xvi -
Cleaning and Working with Internal Devices
WARNING
Do not disassemble, repair, or alter the Device Expansion Unit.
Do not attempt to disassemble, repair, or alter the Device Expansion Unit on
any occasion other than described in this User's Guide. Failure to follow this
instruction may cause malfunctions of the Device Expansion Unit but also an
electric shock or fire.
Disconnect the power plug before cleaning the Device Expansion Unit.
Make sure to power off the Device Expansion Unit and disconnect the power
plug from a power outlet before cleaning or installing/removing option boards.
Touching any internal device of the Device Expansion Unit with its power cord
connected to a power source may cause an elec
tric shock or a fire due to short
circuit even if the Device Expansion Unit is powered off.
Also, disconnect the power plug from the outlet occasionally and clean the plug
with a dry cloth. Heat will be generated if condensation is formed on a dusty
plug, which may cause a fire.
CAUTION
High temperature
Immediately after the Device Expansion Unit is powered off, its internal
components such as hard disk drives are very hot. Leave them until their
internal components fully cool down before installing/removing any component.
Make sure to complete cable and option installations.
Always install the power cable, interface cable, and option boards firmly. An
incomplete installation may cause a contact failure, resulting in smoking or fire.
The Device Expansion Unit contains some components that are only good for a
limited period of time and require replacement, such as the internal fan module
and power unit. For stable operation of the Device Expansion Unit, NEC
recommends you replace these components on a regular basis. Consult with
your sales agent for replacement or the product lives.

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During Operation
CAUTION
Do not pull out or remove the Device Expansion Unit from the rack.
Do not pull out or remove the device from the rack while the device is running.
In addition to causing equipment to not function properly, separating the device
from the rack may result in personal injury.
Do not touch the Device Expansion Unit during thunderstorms.
Do not touch any part of the Device Expansion Unit, including the cables, when
a thunderstorm is approaching. Also, do not connect or disconnect any
devices. There may be a risk of electric shock from lightning strike.
Do not place any object on top of the Device Expansion Unit.
The Device Expansion Unit may fall and cause property damage to the
surroundings.
Do not use a cellular phone or pager around the Device Expansion Unit.
Turn off the cellular phone or pager when you near the Device Expansion Unit.
Radio interference may cause malfunctions of the Device Expansion Unit.
Keep any animal (pet) away from the Device Expansion Unit.
Pet's discharges or fur may enter the Device Expansion Unit and cause a fire or
electric shock.

- xviii -
Warning Labels
The warning label is attached to components that have possible danger or their vicinity in
the Device Expansion Unit to inform the user that a hazardous situation may arise when
operating the chassis (do not take off or stain any label). If you find any label unattached,
starting to come off, or stained, or the warning is illegible, contact your sales agent.