Alaxala AX6300S series User manual

ALAXALA AX6300S
Hardware Instruction Manual
AX63S-H001-50X
Reading and storing this manual:
zBefore you use the equipment, carefully read the manual and make sure that you
understand all safety precautions.
zAfter reading the manual, store it in a convenient place for easy reference.

Relevant products
This manual applies to the AX6304S and AX6308S models.
Export Restrictions
If you export this product, please check all restrictions, such as Japan's Foreign Exchange and Foreign
Trade Law and USA export control laws and regulations, and carry out all required procedures. If you
require more information, please contact an ALAXALA Networks Corporation sales representative.
Trademarks
- Ethernet is a product name of Xerox Corporation.
- Windows is a registered trademark of Microsoft Corporation in the United States and other countries.
- Other company and product names are trademarks or registered trademarks of their respective owners.
Reading and storing this manual:
Before you use the equipment, carefully read the manual and make sure that you understand all safety
precautions. After reading the manual, store it in a convenient place for easy reference.
Note
Information in this document is subject to change without notice.
Radio interference
This is a Class A product that supports the Voluntary Control Council for Interference by Information
Technology Equipment standard. In a home environment, this product might cause radio interference, in
which case the user might be required to take appropriate measures.
About harmonic regulations
Products to which the harmonic current emissions standard JIS C 61000-3-2 applies
Applicable products:
AX6304S
AX6308S
Edition history
April 2009 (Edition 6), AX63S-H001-50X
Copyright
Copyright (C) 2009, ALAXALA Networks Corporation. All rights reserved.

I
Preface
About this manual
This manual provides hardware instructions for the ALAXALA AX6300S series of
multilayer Switches. Before you operate the Switch, read this manual carefully and
make sure that you understand all instructions and safety precautions. After reading
the manual, store it in a convenient place for easy reference.
Intended readers
This document is intended for the technical personnel responsible for setting up and
handling AX6300S series switches. Readers are therefore required to have a
knowledge of electric circuits, wiring, and networks.
Structure of this manual
Safety Information
This document includes important notes regarding safe use of AX6300S
series switches. Be sure to read and understand this section prior to using
the Switch.
Chapter 1 Components Overview
Provides an overview of the components of the Switch.
Chapter 2 Preparation for Installation
Describes all environmental conditions and required preparation for
installation of the Switch.
Chapter 3 Preparing Interface Cables and Terminals
Describes the interface cables and the terminals used for the Switch.
Chapter 4 Installing a Switch
Describes how to install the Switch.
Chapter 5 Adding and Replacing Options
Describes how to add and replace the fan unit, power supply unit,
management and switching unit, and the network interface unit.
Appendix A. Cleaning Optical Connectors
Explains how to clean the optical connectors of the transceivers and the fiber
optic cable connectors.

Preface
II
Reading sequence of AX6300S series manuals
NOTE The Troubleshooting Guide is common to the AX2400S, AX3600S,
AX6300S, AX6600S, and AX6700S series.

Preface
Safety-3
Conventions: The terms "Switch" and "switch"
The term Switch (upper-case "S") is an abbreviation for any or all of the following
models:
zAX6300S series switch
The term switch (lower-case "s") might refer to a Switch, another type of switch from
the current vendor, or a switch from another vendor. The context decides the
meaning.
How to obtain this manual
The AX6300S series manuals are available on the ALAXALA website at the
following address:
http://www.alaxala.com/en/index.html
Acronyms
DSF Dispersion Shifted Fiber
EIA Electronic Industries Alliance
JIS Japanese Industrial Standards
LAN Local Area Network
LED Light Emitting Diode
MC Memory Card
MDI Medium Dependent Interface
MDI-X Medium Dependent Interface Crossover
MSU Management and Switching Unit
NIF Network Interface
PS Power Supply
RS-232C Recommended Standard 232C
SD Secure Digital
SFP Small Form factor Pluggable
TCP/IP Transmission Control Protocol/Internet Protocol
T/R Transmitter/Receiver
URL Uniform Resource Locator
UTP Unshielded Twisted Pair
XFP 10 gigabit small Form factor Pluggable

i
Contents
1. Components Overview........................................................................................................... 1
1.1 Switch............................................................................................................................ 2
1.1.1 AX6304S .......................................................................................................... 2
1.1.2 AX6308S .......................................................................................................... 6
1.1.3 Accessories.................................................................................................... 10
1.2 Fan unit (FAN)............................................................................................................. 12
1.2.1 FAN-11 ........................................................................................................... 12
1.3 Power supply unit (PS)................................................................................................ 13
1.3.1 PS-A11........................................................................................................... 13
1.3.2 PS-D11........................................................................................................... 14
1.4 Management and switching unit (MSU)...................................................................... 17
1.4.1 MSU-1A and MSU-1A1.................................................................................. 18
1.4.2 MSU-1B and MSU-1B1.................................................................................. 21
1.5 Network interface unit (NIF) ........................................................................................ 25
1.5.1 Single-size ..................................................................................................... 25
1.5.2 Double-size .................................................................................................... 36
1.6 Memory card (MC) ...................................................................................................... 38
1.7 Transceiver.................................................................................................................. 39
1.7.1 SFP ................................................................................................................ 39
1.7.2 XFP ................................................................................................................ 42
1.8 Blank panel .................................................................................................................45
1.9 Power cable ................................................................................................................ 47
1.9.1 CBL-A12 ........................................................................................................ 47
1.10 Rack fixture ...............................................................................................................48
1.10.1 BRK-11......................................................................................................... 48
1.10.2 BRK-12 ........................................................................................................ 48
1.11 Support bracket ......................................................................................................... 50
1.11.1 BRK-14......................................................................................................... 50
2. Preparation for Installation .................................................................................................. 51
2.1 Preparation workflow................................................................................................... 52
2.2 Installation conditions.................................................................................................. 53
2.3 Carrying a Switch ........................................................................................................ 55
2.4 Power supply facility.................................................................................................... 57
2.4.1 Power supply facility for 100 V AC................................................................. 57
2.4.2 Power supply facility for 200 V AC................................................................. 58
2.4.3 Power supply facility for −48 V DC ................................................................ 60
2.5 Notes on electric noise................................................................................................ 64
2.6 Leakage current .......................................................................................................... 65
2.7 Environment conditions............................................................................................... 66
2.8 Installation location...................................................................................................... 68
2.9 Maintenance area ....................................................................................................... 71
2.10 Cooling requirements ................................................................................................ 72
2.10.1 Airflow .......................................................................................................... 72
2.10.2 Cooling requirements for a desktop installation........................................... 72
2.10.3 Cooling requirements for a rack installation ................................................ 73
2.11 Device noise.............................................................................................................. 74
3. Preparation of Interface Cables and Terminals ................................................................. 75
3.1 List of interface cables ................................................................................................ 76
3.2 Details about interface cables..................................................................................... 78
3.2.1 UTP cables (10/100/1000BASE-T)................................................................ 78
3.2.2 Fiber optic cables (1000BASE-X).................................................................. 79
3.2.3 Fiber optic cables (10GBASE-R) ................................................................... 81

Contents
Safety-ii
3.3 Terminals and connection cables................................................................................ 84
3.3.1 When connecting an operation terminal to the CONSOLE port .................... 84
3.3.2 When connecting an operation terminal to the MANAGEMENT port............ 84
3.3.3 Connecting a modem to the AUX port ........................................................... 86
4. Installing a Switch................................................................................................................. 87
4.1 Required tools ............................................................................................................. 88
4.2 Read prior to operation ............................................................................................... 89
4.3 Installing a Switch on a desktop.................................................................................. 90
4.4 Replacing the rack fixture ........................................................................................... 91
4.4.1 AX6304S ........................................................................................................ 91
4.4.2 AX6308S ........................................................................................................ 92
4.5 Mounting in a rack....................................................................................................... 95
4.5.1 AX6304S (when a guide rail or a shelf is used)............................................. 95
4.5.2 AX6304S (when support brackets are used) ................................................. 97
4.5.3 AX6308S ...................................................................................................... 102
4.6 Connecting and disconnecting the power cable ....................................................... 106
4.6.1 Replacing the bracket preventing disconnection of the power cable (when a
200 V AC power cable is used) .................................................................. 106
4.6.2 Connecting and disconnecting the AC power cable .................................... 107
4.6.3 Connecting and disconnecting the DC power cable.................................... 109
4.7 Attaching a wrist strap ............................................................................................... 115
4.8 Inserting and removing memory cards...................................................................... 116
4.9 Inserting and removing SFP transceivers ................................................................. 119
4.10 Inserting and removing XFP transceivers ............................................................... 121
4.11 Connecting operation terminals .............................................................................. 122
4.12 Connecting interface cables.................................................................................... 124
4.13 Turning the Switch on and off ................................................................................. 126
4.13.1 AX6304S (AC power supply unit installed) ................................................ 126
4.13.2 AX6304S (DC power supply unit installed)................................................ 129
4.13.3 AX6308S (AC power supply unit installed) ................................................ 133
4.13.4 AX6308S (DC power supply unit installed)................................................ 137
4.14 Other operations ..................................................................................................... 142
5. Adding and Replacing Optional Modules......................................................................... 143
5.1 Required tools ........................................................................................................... 144
5.2 Read prior to operation ............................................................................................. 145
5.3 Replacing a fan unit .................................................................................................. 146
5.4 Adding or replacing a power supply unit ................................................................... 150
5.4.1 Adding or replacing an AC power supply unit .............................................. 150
5.4.2 Adding or replacing a DC power supply unit................................................ 154
5.5 Adding or replacing a management and switching unit ............................................ 160
5.6 Adding or replacing a network interface unit............................................................. 170
5.6.1 Single-size network interface unit ................................................................ 170
5.6.2 Double-size network interface unit .............................................................. 177
5.6.3 Installing and removing a single-guide rail .................................................. 186
Appendix .................................................................................................................................. 191
A. Cleaning Optical Connectors ............................................................................................ 192
A.1 Cleaning the optical connectors of transceivers....................................................... 192
A.2 Cleaning fiber optic cables ....................................................................................... 194

Safety-1
Safety Information
Using the AX6300S series switches correctly and safely
zThis guide provides important information for ensuring safe use of the
AX6300S series switches. Please read this guide completely before using
your Switch.
zKeep this guide handy after reading it, so that it is available for later
reference.
zOperate the Switch according to the instructions and procedures provided in
this manual.
zHeed all warnings and cautions for the Switch in this guide. Failure to do so
could result in injury or damage to the Switch.
Before using the Switch
Caution indications
These indications are intended to ensure safe and correct use of the Switch and to
prevent serious injury, and equipment and property damage. Caution information in
this manual and on the Switch is preceded by the indications shown below. Make
sure you fully understand the meaning of the indications before continuing with the
main body of this manual.
Ignoring instructions preceded by this indication and using the Switch
incorrectly could result in death or serious injury to yourself and others.
Ignoring instructions preceded by this indication and using the Switch
incorrectly could result in serious injury to yourself and others.
CAUTION Ignoring instructions preceded by this indication and using the Switch
incorrectly could result in serious damage to the Switch or nearby property.
NOTE Information preceded by this indication is supplementary information that, if
ignored, will not result in physical injury or serious damage to the Switch.
Unauthorized operations
Do not attempt to perform any operations that are not described in this guide.
In the event of a Switch problem, perform the operations below, and contact
maintenance personnel.
zFor a Switch with an AC power supply unit installed, turn off the Switch power
before unplugging the power cable from the outlet.
zFor a Switch with a DC power supply unit installed, turn off the Switch power,
and then set the power supply circuit breaker of the power supply facility to
OFF.
Stay alert and pay careful attention
The warnings and cautions provided on the Switch and in this guide have been
selected after careful consideration. Nevertheless, there is always the possibility of
the unexpected occurring. Therefore, while using a Switch, in addition to the
following instructions, always stay alert and pay careful attention to what you are
doing.

Safety Information
Safety-2
If anything seems wrong, immediately turn off the power.
If smoke or an unusual smell is emanating from the Switch, or if liquid is spilled into
the Switch or a foreign object falls into the Switch, immediately turn off power to the
Switch as described below. Continuing operation could result in fire or electric
shock.
zFor a Switch with an AC power supply unit installed, turn off the Switch power
before unplugging the power cable from the outlet.
zFor a Switch with a DC power supply unit installed, turn off the Switch power,
and then set the power supply circuit breaker of the power supply facility to
OFF.
Do not place the Switch in an unstable location.
When installing the Switch on a table, position the Switch horizontally on a
worktable strong enough to bear the weight of the Switch. Placing the Switch in an
unstable location, such as on an unsteady or tilting surface, might cause the Switch
to fall, resulting in injury.
Do not remove the Switch cover.
Do not remove the Switch cover. Doing so could result in electric shock.
Do not allow any foreign objects to get into the Switch
Do not insert or drop any foreign objects, such as anything metallic or flammable,
through the Switch's ventilation slots. Doing so could result in fire or electric shock.
Do not modify the Switch.
Do not modify the Switch. Doing so could result in fire or electric shock.
Do not subject the Switch to shocks
In the event that the Switch is dropped or any of its components is damaged, turn off
the power, unplug the power cable, and contact maintenance personnel.
Discontinue using the cable to avoid the risk of fire or electric shock.
Do not place any objects on the Switch.
Do not place any metallic object such as a small pin or a paper clip or any container
with a liquid, such as a vase or a flower pot, on the Switch. Liquid or metallic objects
falling into the Switch could result in fire or electric shock.
Use the Switch only with the indicated power supply.
Do not use the Switch at any voltage other than the indicated voltage. Doing so
could result in fire or electric shock.

Safety Information
Safety-3
Ensure that the capacity for incoming current to the distribution board is
greater than the operating current of the circuit breaker.
Ensure that the capacity for incoming current to the distribution board is greater
than the operating current of the circuit breaker. If it is not, the circuit breaker might
not operate properly in the event of a failure, which could result in fire.
Ground the Switch.
Each Switch has at most 3.5 mA of leakage current. To connect a Switch to an AC
power supply, always use a grounded power outlet for the Switch. Using the Switch
without grounding could result in electric shock or failures due to electrical noise.
If you use a DC power supply, always connect the ground terminals. Using the
Switch without grounding could result in electric shock or failures due to electrical
noise.
Connecting and disconnecting a DC power cable must be performed by
a trained technician or maintenance personnel.
Connecting and disconnecting a DC power cable must be performed by a trained
technician or maintenance personnel. Terminal connections are required for
connection of the DC power cable. For this reason, incorrect handling of the DC
power cable could result in fire or electric shock.
Set the circuit breaker of the power supply facility to OFF before
connecting or disconnecting the DC power cable.
Make sure the circuit breaker of the power supply facility is set to OFF before
connecting or disconnecting the DC power cable. Connecting or disconnecting the
cable with the circuit breaker of the power supply facility set to ON could result in fire
or electric shock.

Safety Information
Safety-4
Place an insulation cover over the 0 V and −48 V terminals of a DC power
cable.
Place an insulation cover over the 0 V and −48 V terminals of a DC power cable
before using them. Using the terminals without an insulation cover could result in
fire or electric shock.
Do not use a DC power supply with the cover of the terminal board
removed.
After attaching a power cable, attach the cover to the terminal board when using a
DC power supply. Using the power supply unit without the cover could result in
electric shock.
Do not touch the terminal used to measure voltage.
A power supply unit has a terminal used to measure voltage. This terminal is used
for inspection before the unit is shipped from the factory. Customers must not use
this terminal. In addition, do not insert anything with a narrow tip, such as a pin or
paper clip, into the terminal. Doing so could result in fire or electric shock.
The Switch must be installed and carried by at least three people.
The table below lists the weight of each Switch. A Switch must be installed and
carried by at least three people. Installing or carrying a Switch with too few people
could result in the Switch being dropped or falling, possibly leading to injury.
Number of people required to carry a Switch:
Model Weight Number of people
AX6304S 45 kg
AX6308S 64 kg
Three or more
The following label is attached to a Switch.

Safety Information
Safety-5
Handle power cables carefully.
Do not place anything heavy on a power cable. Do not pull, bend, or modify a cable.
Doing so could damage the cable, resulting in fire or electric shock. If the power
cable is covered with a carpet or the like, it is easy to forget that the cable is there
and to place something heavy on it.
Use the supplied or a designated power cable. Using another cable could result in
fire or electric shock.
In addition, do not use the supplied cable with other devices. Doing so could result
in fire or electric shock.
If the power cable is damaged so that the wires underneath the covering are visible
or cut, stop using it, and ask maintenance personnel to replace it. Discontinue using
the cable to avoid the risk of fire or electric shock.
Make sure the power plug is free of dust, and insert the plug completely up to the
base of the prongs to prevent any looseness. Using a power plug with dust on it or
one that is imperfectly connected could result in fire or electric shock.
Do not overload the power outlet.
Do not overload the power outlet by connecting multiple power plugs to the same
outlet. Overloading the outlet could result in fire or the circuit breaker tripping due to
excessive power used. This can affect other equipment.
Before turning off the power, set all power switches or the circuit breaker
for the Switch to OFF.
A Switch has multiple input power supplies. When turning off the Switch power, set
all power supply switches (with an AC power supply unit installed) or the circuit
breaker (with a DC power supply unit installed) to OFF.
The following label is attached to a Switch.
Adding or replacing an option must be performed by a trained technician
or maintenance personnel.
Adding or replacing an optional module must be performed by a trained technician
or maintenance personnel.
Adding or replacing a power supply unit requires connecting or disconnecting the
power cable. If an untrained person performs the operation and mishandles the
power cable, fire or electric shock could result.
Also, mishandling other optional modules could result in injury or damage.

Safety Information
Safety-6
When pressing the reset button, do not use anything with a fragile tip, or
anything that might become caught in the Switch, such as a pin or paper
clip.
When pressing the reset button on the front panel, do not use anything with a fragile
tip, or anything that might become caught in the Switch, such as a pin or paper clip.
Doing so could result in fire or electric shock.
When adding or replacing a power supply unit, disconnect the power
supply cable.
When adding or replacing a power supply unit, disconnect the power cable from the
power supply unit that will be replaced.
If the power cable is connected and the power switch is turned off, power is still
supplied to some circuits. For this reason, adding or replacing a power supply unit
with the power cable connected could result in fire or electric shock.
Do not use an air duster near a flame.
When cleaning the optical connectors, do not use an air duster that contains
flammable gas near a flame. Doing so could result in fire.

Safety Information
Safety-7
Do not install the Switch in a dusty or humid location.
Do not install the Switch in a dusty or humid location. Doing so could result in fire or
electric shock.
Condensation might form on the surfaces and the inside of the Switch if it is moved
from a cold location to a warm location. Using the Switch in this condition could
result in fire or electric shock. After moving the Switch between two locations with a
large temperature variation, let the Switch stand a few hours before using it.
Do not stack Switches.
Do not stack Switches. Doing so might damage the Switch. Furthermore, the Switch
might fall, or become unbalanced, resulting in injury.
Do not step on the Switch, lean against it, or place anything on it.
Do not step on the Switch, lean against it, or place anything on it. Doing so might
damage the Switch. Furthermore, the Switch might fall, or become unbalanced,
resulting in injury.
When mounting a Switch into a rack, use a fixture that can support the
weight of the Switch.
It is not possible for the provided rack fixture alone to support the weight of a Switch.
Its purpose is merely to hold a Switch in the rack. Accordingly, use the following
fixtures:
zAX6304S : Guide rails, shelves, and support brackets
zAX6308S : Guide rails and shelves
You must use the guide rails and shelves provided with the rack, and these must be
able to support the weight of the Switch (with the maximum number of optional
modules installed).
Do not use support brackets with a Switch other than the AX6304S.
The support bracket supports the AX6304S only. Do not use the bracket with
another Switch.
Using a bracket with another Switch might cause the Switch to drop or fall, resulting
in injury.
Be careful when using support brackets.
When using support brackets to mount a switch on a rack, hold the front and back of
the Switch and mount it horizontally. You must hold the Switch until the screws have
been tightened. If the Switch tilts, it could drop or fall, resulting in injury. In addition,
other devices mounted in the same rack might be damaged.
When support brackets are used to mount a Switch on a rack, the weight of the
Switch is borne by the rack fixture and the support brackets only. Securely tighten
the screws on the rack fixtures and the support brackets.

Safety Information
Safety-8
Do not obstruct the ventilation slots.
Do not obstruct the ventilation slots of the Switch. Doing so causes heat to
accumulate inside the Switch, and could result in fire. Maintain a space of at least
70 mm around the ventilation slots.

Safety Information
Safety-9
Do not allow hair or objects near the ventilation slots.
Because a Switch is equipped with internal cooling fan units, do not allow anything
near ventilation slots. Doing so causes heat to accumulate inside the Switch and
could cause a failure. Do not allow hair or other light material or objects near the
ventilation slots because they might be sucked into the Switch, resulting in injury.
When moving a Switch, do not hold the handles of optional modules.
When moving a Switch, do not hold the handle of the fan unit or power supply unit.
The handle might come off, resulting in the Switch falling and possibly causing injury.
Also, the fan unit or power supply unit might become deformed, resulting in fire or
electric shock.
Unplug the cables before moving a Switch.
Before moving a Switch, you must turn it off and unplug all cables. Failure to do so
might cause the Switch or cable to become deformed, or might damage the Switch,
resulting in fire or electric shock.
Do not drop an optional module.
Handle an optional module carefully so that you do not drop it. Dropping it could
result in injury.
The weight of a DC power supply unit is 5.6 kg and the front-to-back measurement
is 163 mm. When removing a DC power supply unit from a Switch, support the DC
power supply unit itself. If you pull the unit carelessly, it might fall, possibly resulting
in injury. The following label is attached to a DC power supply unit.
Do not touch the inside of the Switch with your hands.
Do not carelessly put your hands inside the Switch. The frame and components
might cause injury.
When removing a management and switching unit or a network interface
unit, use care because it might be very hot.
The components in a management and switching unit and a network interface unit
might be very hot. Do not touch any components with your hands. Doing so could
result in burns.

Safety Information
Safety-10
When removing a fan unit, do not place your hands near the fan if it is
rotating.
Immediately after a fan unit is removed, the blades might still be rotating. While the
fan blades are rotating, do no place your hands near them. Doing so might result in
injury. The following label is attached to a fan unit.
Handle the power cable carefully.
Do not place a power cable near a heat-generating apparatus, because the heat
could melt the cable coating, resulting in fire or electric shock.
When plugging or unplugging a power cable from the outlet, always hold the plug,
not the cable itself. Pulling the cable itself might cause the wires to break.
Do not directly touch a Switch if you have a metal allergy.
A Switch is plated with zinc, nickel, or gold. If you are allergic to these metals, do not
directly touch the Switch. Doing so might cause a skin eruption or a rash.
Avoid looking directly at laser beams.
A network interface unit attached with the label below uses a laser beam. Never
look directly into the optical transceiver.
Lithium batteries
A Switch uses a lithium battery for the real-time clock. Mishandling the battery might
cause the battery to generate heat, explode, or catch fire, resulting in injury or fire.
Do not remove the battery from a Switch, disassemble it, heat it to 100oC or more,
burn it, or allow it to become wet.

Safety Information
Safety-11
Cleaning
Remove dust on and around the Switch regularly. In addition to causing the switch
to stop, accumulated dust could result in fire or electric shock.

Safety Information
Safety-12
Do not turn off the Switch power while software is being updated (when
the ppupdate command is being executed).
When the ppupdate command is executed, the Switch restarts automatically. Do
not turn off the Switch until it is restarted (until the STATUS LED on the
management and switching unit changes from blinking green to constant green).
Failure to do so could result in a Switch failure.
If the ACC LED is lit, do not remove the memory card or turn off the
power.
When the ACC LED on the front panel of the Switch is lit, the memory card is being
accessed. While a memory card is being accessed, do not remove the memory card
or turn off the power. Doing so might damage the memory card. In addition, some
commands require a certain amount of time after being entered to finish accessing
the card. Make sure that the memory card is no longer being accessed before
removing the card or turning off the power.
Handle memory cards carefully.
When inserting a memory card, do not push the card too strongly or flick it with your
finger. When removing a memory card, do not forcibly pull out the card if it is locked.
Doing so might damage the connector of the memory card slot.
Remove the memory card before moving the Switch. If a card is subjected to
excessive force when the Switch is moved, the connector of the memory card slot
might be damaged.
Do not attach any labels to a transceiver.
A label attached to the transceiver indicates that the transceiver is a standard
product from ALAXALA or another manufacturer. However, such labels are attached
where they do not interfere with heat dissipation from the transceiver or the
mechanism that prevents the transceiver from coming loose from the cage.
Attaching a label to a location that interferes with these functions could cause a
malfunction in the transceiver or damage to the Switch.
For power supply facility, avoid a voltage drop caused by inrush current.
When a Switch is turned on, inrush current flows. Consider measures for avoiding a
voltage drop in the power supply facility caused by the inrush current. Voltage drops
affect not only the Switch, but also the devices connected to the same power supply
facility.
Turn off the power before connecting or disconnecting the power supply
cable.
Before connecting or disconnecting a power cable, turn off the power to the device
to be installed or removed.