H3C S5120V3-EI Series User manual

i
Contents
1 Preparing for installation··········································································1-1
Safety recommendations ································································································································1-2
Examining the installation environment ··········································································································1-3
Cleanliness··············································································································································1-4
Corrosive gas limit···································································································································1-5
Examining the installation site·························································································································1-6
Checking power distribution or power supply environment·············································································1-7
Laser safety·····················································································································································1-7
Installation tools ··············································································································································1-7
Installation accessories···································································································································1-7
2 Installing the switch················································································2-10
Installing the switch in a 19-inch rack············································································································2-11
Installation methods······························································································································2-11
Installation procedure at a glance·········································································································2-13
Rack-mounting the switch by using front mounting brackets································································2-14
Rack-mounting the switch by using front and rear mounting brackets··················································2-19
Mounting the switch on a workbench············································································································2-23
Mounting the switch on a wall·······················································································································2-23
Grounding the switch ····································································································································2-25
Grounding the switch with a grounding strip·························································································2-25
Grounding the switch with a grounding conductor buried in the earth ground······································2-26
Verifying the connection after grounding the switch··············································································2-27
Installing and removing a power supply········································································································2-28
Installing a power supply·······················································································································2-28
Removing a power supply·····················································································································2-30
Connecting the power cord···························································································································2-31
Connecting the AC power cord for the fixed AC power supply·····························································2-31
Connecting the power cord for a PSR360-56A, PSR720-56A, or PSR1110-56A power supply···········2-32
Connecting the DC power cord for a PSR560-56D power supply ························································2-33
Verifying the installation································································································································2-33
3 Accessing the switch for the first time····················································3-35
Connecting the switch to a configuration terminal·························································································3-35
Connecting a DB9-to-RJ45 console cable····························································································3-36
Connecting a USB-to-RJ45 console cable····························································································3-37
Connecting a micro USB console cable································································································3-38
Setting terminal parameters··························································································································3-40
Powering on the switch·································································································································3-40
4 Setting up an IRF fabric·········································································4-42
IRF fabric setup flowchart ·····························································································································4-43
Planning IRF fabric setup······························································································································4-44
Planning IRF fabric size and the installation site···················································································4-44
Identifying the master switch and planning IRF member IDs································································4-44
Planning IRF topology and connections································································································4-44
Identifying IRF physical ports on the member switches········································································4-45
Planning the cabling scheme················································································································4-47
Configuring basic IRF settings······················································································································4-48
Connecting the IRF physical ports················································································································4-49
Verifying the IRF fabric setup························································································································4-49
5 Maintenance and troubleshooting··························································5-50
Fixed power supply failure ····························································································································5-50
Symptom···············································································································································5-50
Solution·················································································································································5-50
Removable power supply failure···················································································································5-50

ii
Symptom···············································································································································5-50
Solution·················································································································································5-50
Fan tray failure··············································································································································5-51
Configuration terminal issues························································································································5-51
No display on the configuration terminal·······························································································5-51
Garbled display on the configuration terminal·······················································································5-51

1-1
1 Preparing for installation
This document provides an installation guide for the following switch series:
•
S5120V3-EI switch series
•
S5120V3-LI switch series
•
S5120V3-SI switch series
Table1-1 describes the switch models that each switch series includes.
Table1-1 Switch series and models
Switch series Model Product code (PID)
S5120V3-EI
switch series
Non-PoE
models
S5120V3-28S-EI LS-5120V3-28S-EI
S5120V3-54S-EI LS-5120V3-54S-EI
S5120V3-28P-EI LS-5120V3-28P-EI
S5120V3-54P-EI LS-5120V3-54P-EI
S5120V3-36F-EI LS-5120V3-36F-EI
PoE models
S5120V3-28S-HPWR-EI LS-5120V3-28S-HPWR-EI
S5120V3-54S-PWR-EI LS-5120V3-54S-PWR-EI
S5120V3-30MS-UPWR-DP-EI LS-5120V3-30MS-UPWR-DP-EI
S5120V3-LI
switch series
Non-PoE
models
S5120V3-10P-LI LS-5120V3-10P-LI
LS-5120V3-10P-LI-GL
S5120V3-20P-LI LS-5120V3-20P-LI
LS-5120V3-20P-LI-GL
S5120V3-28S-LI LS-5120V3-28S-LI
LS-5120V3-28S-LI-GL
S5120V3-28P-LI LS-5120V3-28P-LI
LS-5120V3-28P-LI-GL
S5120V3-52S-LI LS-5120V3-52S-LI
LS-5120V3-52S-LI-GL
S5120V3-52P-LI LS-5120V3-52P-LI
LS-5120V3-52P-LI-GL
PoE models
S5120V3-28S-PWR-LI LS-5120V3-28S-PWR-LI
LS-5120V3-28S-PWR-LI-GL
S5120V3-28P-PWR-LI LS-5120V3-28P-PWR-LI
LS-5120V3-28P-PWR-LI-GL
S5120V3-52S-PWR-LI LS-5120V3-52S-PWR-LI
LS-5120V3-52S-PWR-LI-GL
S5120V3-52P-PWR-LI LS-5120V3-52P-PWR-LI
LS-5120V3-52P-PWR-LI-GL
S5120V3-28P-HPWR-LI-Q LS-5120V3-28P-HPWR-LI-Q

1-2
Switch series Model Product code (PID)
S5120V3-28P-HPWR-LI LS-5120V3-28P-HPWR-LI
LS-5120V3-28P-HPWR-LI-GL
S5120V3-28S-HPWR-LI LS-5120V3-28S-HPWR-LI
LS-5120V3-28S-HPWR-LI-GL
S5120V3-10P-PWR-LI LS-5120V3-10P-PWR-LI
LS-5120V3-10P-PWR-LI-GL
S5120V3-12TP-HPWR-LI LS-5120V3-12TP-HPWR-LI
S5120V3-SI
switch series
Non-PoE
models
S5120V3-10P-SI LS-5120V3-10P-SI
S5120V3-28P-SI LS-5120V3-28P-SI
S5120V3-28S-SI LS-5120V3-28S-SI
S5120V3-52P-SI LS-5120V3-52P-SI
S5120V3-52S-SI LS-5120V3-52S-SI
S5120V3-36F-SI LS-5120V3-36F-SI
PoE models
S5120V3-28P-HPWR-SI LS-5120V3-28P-HPWR-SI
S5120V3-54P-PWR-SI LS-5120V3-54P-PWR-SI
S5120V3-28S-HPWR-SI-Q LS-5120V3-28S-HPWR-SI-Q
NOTE:
Switches of the same model but
different PIDs might differ in hardware and software features.
You
can view the PID of a switch on the label located on its rear panel or top panel.
Safety recommendations
To avoid equipment damage or bodily injury, read the following safety recommendations before
installation. Note that the recommendations do not cover every possible hazardous condition.
•
Before cleaning the switch, remove all power cords from the switch. Do not clean the switch
with wet cloth or liquid.
•
Do not place the switch near water or in a damp environment. Prevent water or moisture from
entering the switch chassis.
•
Do not place the switch on an unstable case or desk. The switch might be severely damaged in
case of a fall.
•
Ensure good ventilation at the installation site and keep the air inlet and outlet vents of the
switch free of obstruction.
•
Make sure the operating voltage is as required.
•
To avoid electrical shocks, do not open the chassis while the switch is operating or when the
switch is just powered off.
•
Always wear an ESD wrist strap when installing the switch. Make sure the strap makes good
skin contact and is reliably grounded.

1-3
Examining the installation environment
To ensure correct operation of your switch, make sure the installation environment meets the
requirements listed in Table1-2.
Table1-2 Checking list for the installation environment
Item Requirements
Ventilation and heat dissipation
CAUTION:
To ensure correct operation of your device, make sure the installation
environment is adequately ventilated to prevent the switch from
overheating.
•Ensure a minimum clearance of 10 cm (3.94 in) around the chassis.
•Do not install the device near a heat source, for example, a stove or
heater.
•Ensure air ventilation in the installation environment.
•Do not block the ventilation holes in the device or power adapter.
Anti-moisture
CAUTION:
Water or moisture might damage the circuits of the device.
•Do not place the device near water or in a damp environment.
•Install the switch in a clean, dry, and ventilated place where
temperature is controlled in a stable range.
•Make sure the installation environment is free from water leakage or
condensation. If required, install a dehumidification device (such as
an air conditioner with a dehumidification function or a dedicated
dehumidifier).
•Do not operate the device under or near the water source, such as
the wash basin, laundry room, or areas with high humidity.
•Do not touch the device with wet hands.
Temperature/humidity
For correct operation and long service life of your switch, maintain the
temperature and humidity in the equipment room at acceptable ranges.
•Lasting high relative humidity can cause poor insulation, electricity
leakage, mechanical property change of materials, and metal
corrosion.
•Lasting low relative humidity can cause washer contraction and
ESD and cause issues including loose mounting screws and circuit
failure.
•High temperature can accelerate the aging of insulation materials
and significantly lower the reliability and lifespan of the switch.
For the temperature and humidity requirements of the switch, see
technical specifications in S5120V3-EI & S5120V3-LI & S5120V3-SI
Switch Series Hardware Information and Specifications.
Lightning protection
CAUTION:
Ground the switch correctly and verify the grounding. For more
information, see "Grounding the switch."
•If you ground the switch by using a grounding strip, make sure the
grounding resistance of the grounding strip in the equipment roomis
less than 1Ω.
•If you ground the switch by using a grounding conductor buried in
the earth ground, make sure the grounding resistance of the
grounding conductor in the ground is less than 10Ω.
•Route the signal cables along indoor walls, bury the cables in the
earth ground, or thread the cables through steel tubes. Install a
signal lightning arrester with a nominal discharge current for a

1-4
Item Requirements
corresponding network interface.
•Keep the signal cables far from power cords and lightning rod down
conductors.
•As a best practice, route power cords indoors. If anAC power cord
is routed from outdoors, connect theAC power cord first to a power
lightning arrester before leading it to theAC power port on the
switch. Make sure the power lightning arrester has a nominal
discharge current and the total length of the power cord from the
power lighting arrester to the power port on the switch is less than 5
m (16.40 ft).
•
Ground the switch, rack, independent power supplies, and lightning
arresters separately.
•You must ground optical fibers with reinforcing metal stiffener from
outdoors on an optical distribution frame (ODF) or fiber splice
enclosure.
Cable routing
CAUTION:
Do not run an Ethernet cable and power cord in parallel.
•Route different types of cables separately.
•Keep power cords a minimum of 5 cm (1.97 in) away from other
cables.
ESD prevention
•Ground the switch correctly.
•To avoid ESD damage to the device orcomponents, always wear an
ESD wrist strap when you install or remove the device or
components.
•Make sure the wrist strap has good skin contact and is reliably
grounded.
Cleanliness •For more information, see "Cleanliness."
Corrosive gas prevention The installation site must be free from corrosive gases such as acid
gases and alkaline gases. For more information, see "Corrosive gas
limit."
EMI
•If AC power is used, use a single-phase three-wire power receptacle
with protection earth (PE) to filter interference from the power grid.
•Keep the device far away from radio transmitting stations, radar
stations, and high-frequency devices.
•Use electromagnetic shielding, for example, shielded interface
cables, when necessary.
Cleanliness
Dust buildup on the chassis might cause electrostatic adsorption and dust corrosion, resulting in
poor contact of metal connectors and contact points. This might shorten the device's lifetime and
even cause device failure in the worst case. Table1-3 describes the switch requirement for
cleanliness.
Table1-3 Switch requirement for cleanliness
Substance Particle diameter Concentration limit
Dust particles ≥ 0.5 µm ≤ 1.8 × 107particles/m3
To maintain cleanliness in the equipment room, follow these guidelines:
•
Keep the equipment room away from pollution sources. Do not smoke, eat, or drink in the
equipment room.

1-5
•
Use double-layer glass in windows and seal doors and windows with dust-proof rubber strips.
Use screen doors and window screens for doors and windows open to the outside and make
sure the external windows are air tight.
•
Use dustproof materials for floors, walls, and ceilings and use wallpaper or matt paint that does
not produce powders.
•
Clean the equipment room regularly and clean the air filters of the rack each month.
•
Wear ESD clothing and shoe covers before entering the equipment room, keep the ESD
clothing and shoe covers clean, and change them frequently.
Corrosive gas limit
Corrosive gases can accelerate corrosion and aging of metal components. Make sure the corrosive
gases do not exceed the concentration limits as shown inTable1-4.
Table1-4 Corrosive gas concentration limits
Gas Average concentration (mg/m3) Maximum concentration (mg/m3)
SO20.3 1.0
H2S 0.1 0.5
Cl20.1 0.3
HCI 0.1 0.5
HF 0.01 0.03
NH31.0 3.0
O30.05 0.1
NOX0.5 1.0
CAUTION:
As a best practice, control the
corrosive gas concentrations in the equipment room at their
average
values
. Make sure the corrosive gas concentrations do not exceed 30 minutes per day at their
maximum values.
To control corrosive gases, use the following guidelines:
•
As a best practice, do not build the equipment room in a place with a high concentration of
corrosive gases.
•
Make sure the equipment room is not connected to sewer, vertical shaft, or septic tank pipelines
and keep it far away from these pipelines. The air inlet of the equipment room must be away
from such pollution sources.
•
Use environmentally friendly materials to decorate the equipment room. Avoid using organic
materials that contains harmful gases, such as sulfur or chlorine-containing insulation cottons,
rubber mats, sound-proof cottons, and avoid using plasterboards with high sulfur concentration.
•
Place fuel (diesel or gasoline) engines separately. Do not place them in the same equipment
room with the device. Make sure the exhausted air of the engines will not flow into the
equipment room or towards the air inlet of the air conditioners.
•
Place batteries separately. Do not place them in the same room with the device.
•
Employ a professional company to monitor and control corrosive gases in the equipment room
regularly.

1-6
Examining the installation site
Before you install the switch, verify that the installation site meets the installation requirements. The
switch can operate correctly in an A1 or A2 installation site. Availability issues might occur if you
install the switch in an A3, B1, B2, or C installation site.
Table1-5 Installation sites
Category Definition Example
A1: indoor controlled
environment
•Indoor environments where
temperature and humidity are
controlled.
•Completely enclosed or shielded
indoor environments.
Central equipment rooms, IDC
equipment rooms, mobile cabins
with air conditioners, outdoor air
conditioner cabinets, and heat
exchanger cabinets.
A2: indoor partially
controlled
environment
•Indoor environments where
temperature and humidity are partially
controlled.
•Incompletely enclosed or shielded
places.
•Places far from pollution sources.
Simple equipment rooms, ordinary
houses, garages, corridors, and
direct ventilation cabinets far from
pollution sources, houses without
direct exposure to sunlight or rain,
railway station platforms, and
stadiums.
A3: indoor
uncontrolled
environment
•Indoor environments where
temperature and humidity are
uncontrolled.
•Incompletely enclosed or shielded
places.
•Places near pollution sources.
Simple equipment rooms, ordinary
houses, garages, corridors, and
direct ventilation cabinets near
pollution sources, houses without
direct exposure to sunlight or rain,
railway station platforms, stadiums,
uncleaned rooms after decoration,
and rooms under decoration.
B1: outdoor general
environment
•Unshielded places where the
temperature and humidity are not
controlled.
•Places far from pollution sources.
Completely exposed outdoor places
far from pollution sources.
B2: harsh
environment
•Unshielded places where the
temperature and humidity are not
controlled.
•Sea environments or outdoor land
environments near pollution sources.
Islands, ships, and completely
exposed outdoor places near
pollution sources.
C: special
environments Special application environments Buried, underwater, or undersea environments and manholes.
Table1-6 Pollution sources
Category Radius range
Saline water areas such as oceans and saline lakes ≤3.7 km (2.30 miles)
Serious pollution sources suchas metallurgic plants,coal mines, and
heat and power plants ≤3 km (1.86 miles)
Medium pollution sources
such as chemical factories, rubber plants,
and electroplating factories ≤2 km (1.24 miles)
Light pollution sources, such as food factories, tanneries, and
heating boilers ≤1 km (0.62 miles)

1-7
Checking power distribution or power supply
environment
Table1-7 Requirements for power distribution or power supply environment
Item Requirements
Preparation The power supply must be available before you install the switch.
Voltage The voltage provided to the switch must be within the operating voltage range.
For the operating voltage range, see S5120V3-EI & S5120V3-LI & S5120V3-SI
Switch Series Hardware Information and Specifications.
Power receptacle and
cables
•If the external power supply system provides an AC power outlet, use a
country-specificAC power cord. Make sure the PE wire of the AC power
supply is grounded reliably.
•
If the externalpowersupplysystem providesa DC distribution box, prepare
DC power cords yourself.
•Do not use the power cord provided with the switch on other devices.
Laser safety
WARNING!
Disconnected optical fibers or
transceiver modules might emit invisible laser light. Do not stare into
beams or view directly with optical instruments when the switch is operating.
The switch is a Class 1 laser device.
Installation tools
No installation tools are provided with the switch. Prepare the following tools yourself as required:
•
ESD wrist strap
•
Flat-head screwdriver
•
Phillips screwdriver
•
Needle-nose pliers
•
Marker
Installation accessories
Before installation, make sure you have all the required installation accessories. If any accessory is
damaged or missing, use the product code provided in this table to purchase a new one.
Table1-8 Installation accessories
Product code Description Quantity Applicable device
models
2150A0F4 Front mounting bracket kit,
including two front mounting
brackets and four M4 screws 1 kit (provided) S5120V3-LI switch
series (excluding the
S5120V3-10P-LI,
S5120V3-20P-LI,

1-8
Product code Description Quantity Applicable device
models
S5120V3-10P-PWR-LI,
and
S5120V3-12TP-HPWR
-LI switches)
S5120V3-28P-SI
S5120V3-28S-SI
S5120V3-52P-SI
S5120V3-52S-SI
S5120V3-28S-HPWR-
SI-Q
2150A03X
Front mounting bracket kit
(including two front mounting
brackets and eight M4
screws)
1 kit (provided)
S5120V3-EI switch
series
S5120V3-36F-SI
S5120V3-28P-HPWR-
SI
S5120V3-54P-PWR-SI
2150A0BP
Rear mounting bracket kit
(including two rear mounting
brackets and two shoulder
screws)
1 kit (provided) S5120V3-30MS-UPWR
-DP-EI
SOHO-SWITCH-FL-02
Front mounting bracket kit
(including two front mounting
brackets and four M4 screws)
1 kit (optional)
S5120V3-12TP-HPWR
-LI
S5120V3-10P-PWR-LI
S5120V3-20P-LI
SOHO-SWITCH-FL-01
Front mounting bracket kit
(including two front mounting
brackets and four M4 screws)
1 kit (optional) S5120V3-10P-SI
S5120V3-10P-LI
N/A M6 screw and cage nut User supplied All switch models
N/A
Rubber feet
4 (provided) All switch models

1-9
Product code Description Quantity Applicable device
models
N/A
Grounding cable
1 (provided) All switch models
N/A Grounding screw 1 (provided) All switch models
N/A
AC power cord
The appearance and
parameters for AC power
cords vary by countries and
regions. The power cord in
this table is a standard power
cord in China.
1, provided for the
switch with a fixed
power supply
1, provided with
removable power
supplies
All switch models
N/A
DC power cord
1, provided with
removable DC
power supplies
S5120V3-30MS-UPWR
-DP-EI
04042967
DB9-to-RJ45 console cable
1 (optional) All switch models
0404A1EE
USB-to-RJ45 console cable
1 (optional) All switch models
N/A
Micro USB console cable
1 (user supplied)
S5120V3-28P-HPWR-
LI-Q
S5120V3-28S-HPWR-
SI-Q

2-10
2 Installing the switch
CAUTION:
Keep the tamper
-
proof seal on a mounting screw on the chassis cover intact, and if you want to open
the chassis, contact H3C for permission. Otherwise, H3C shall not be liable for any consequence.
Figure2-1 Hardware installation flow
Start
Install the switch
Ground the switch
Connect the power cords
Verify the installation
Turn on the circuit
breakers
Operating correctly? Turn off the circuit
breakers
Troubleshoot the
switch
No
Has power supply slots?
Yes
Select and install power
supplies
Yes
No
End
Connect interface cables

2-11
Installing the switch in a 19-inch rack
Installation methods
Table2-2 Installation methods
Switch models Installation
method Mounting bracket type Description Installation
procedure
S5120V3-LI switch
series (excluding the
S5120V3-10P-LI,
S5120V3-20P-LI,
S5120V3-10P-PWR-LI,
and
S5120V3-12TP-HPWR-L
I switches)
S5120V3-28P-SI
S5120V3-28S-SI
S5120V3-52P-SI
S5120V3-52S-SI
S5120V3-28S-HPWR-SI
-Q
Using front
mounting
brackets
Mounting bracket
A (provided), as
shown by callout
(A) in Figure2-2
Select an installation
position for the front
mounting brackets as
required: near the
power supply side or
port side.
For the
S5120V3-28S-EI,
S5120V3-54S-EI,
S5120V3-28P-EI,
S5120V3-54P-EI,
S5120V3-36F-EI,
S5120V3-28P-HPWR-
LI-Q, S5120V3-28P-SI,
S5120V3-28S-SI,
S5120V3-52P-SI,
S5120V3-52S-SI,
S5120V3-36F-SI, or
S5120V3-28S-HPWR-
SI-Q switch, or the
S5120V3-LI switch
series, the front
mounting brackets can
be installed only near
the port side.
See
"Rack-mountin
g the switch by
using front
mounting
brackets."
S5120V3-EI switch
series (excluding the
S5120V3-30MS-UPWR-
DP-EI switch)
S5120V3-36F-SI
S5120V3-28P-HPWR-SI
S5120V3-54P-PWR-SI
Mounting bracket
B (provided), as
shown by callout
(B) in Figure2-2
S5120V3-12TP-HPWR-L
I
S5120V3-10P-PWR-LI
S5120V3-20P-LI
Mounting bracket
C (optional, with a
product code of
SOHO-SWITCH-F
L-02), as shown
by callout (C) in
Figure2-2
N/A
S5120V3-10P-SI
S5120V3-10P-LI
Mounting bracket
D (optional, with a
product code of
SOHO-SWITCH-F
L-01), as shown
by callout (D) in
Figure2-2
N/A
S5120V3-30MS-UPWR-
DP-EI
Using front
and rear
mounting
brackets
Mounting bracket
B (provided), as
shown by callout
(B) in Figure2-2
Rear mounting
bracket
(provided), as
•Select an
installation
position for the
front mounting
brackets as
required: near the
power supply side
See
"Rack-mountin
g the switch by
using front and
rear mounting
brackets."

2-12
Switch models Installation
method Mounting bracket type Description Installation
procedure
shown in
Figure2-3
or port side.
•Install the rear
mounting brackets
based on the rack
depth (distance
between the front
and rear rack
posts).
If the rack
depth is in the
range of 429 to
595 mm (16.89
to 23.43 in),
orient the rear
mounting
brackets with
the wide flange
inside the rack.
If the rack
depth is in the
range of 274 to
440 mm (10.79
to 17.32 in)
and the
distance from
the rear rack
posts to the
inner surface
of the cabinet
door is greater
than 153 mm
(6.02 in), orient
the rear
mounting
brackets with
the wide flange
outside the
rack.
•If you are to install
a PSR1110-56A
power supply,
make sure the
rack depth is
larger than 600
mm (23.62 in).

2-13
Figure2-2 Front mounting brackets
(1) Screw hole for attaching the mounting bracket to the switch
(2) Screw hole for attaching the mounting bracket to the rack
Figure2-3 Rear mounting bracket and shoulder screw
(1) Shoulder screw
(2) Screw hole for attaching the mounting bracket to the rack
Installation procedure at a glance
Figure2-4 Procedure for installing the switch in a 19-inch rack by using front mounting
brackets
Attach the front
mounting brackets to
the switch
Select an installation position
for the front mounting brackets
(near the port side or power supply side) Mount the switch
in the rack

2-14
Figure2-5 Procedure for installing the switch in a 19-inch rack by using front and rear
mounting brackets
NOTE:
If a rack shelf is available, you can put the switch on the rack shelf, slide the switch to an appropriate
location, and then attach the switch to the rack by using the mounting brackets.
Rack-mounting the switch by using front mounting brackets
This installation method is applicable to all switches except for the S5120V3-30MS-UPWR-DP-EI
switch.
Attaching the front mounting brackets to the switch
1. Place the wide flange of the front mounting bracket against the chassis side panel. Align the
mounting bracket installation holes with the screw holes in the chassis.
2. Fasten the M4 screws to secure the mounting bracket to the switch. As a best practice, use a
torque of 12 kgf-cm (1.18 Nm) to fasten the M4 screws.
To attach mounting bracket Ato the switch, see Figure2-6.
To attach mounting bracket B to the switch, see Figure2-7 and Figure2-8.
To attach mounting bracket C to the switch, see Figure2-9.
To attach mounting bracket D to the switch, see Figure2-10.
Figure2-6 Attaching mounting bracket A to the port-side mounting position
(S5120V3-52P-PWR-LI)
Attach the front
mounting
brackets to the
switch
Attach the
shoulder
screws to the
switch
Attach the
rear mounting
brackets to
the rack
Select an installation position
for the front mounting brackets
(near the port side or power
supply side)
Mount the
switch in the
rack

2-15
Figure2-7 Attaching mounting bracket B to the port-side mounting position
(S5120V3-28S-HPWR-EI)
Figure2-8 Attaching mounting bracket B to the power supply-side mounting position
(S5120V3-28S-HPWR-EI)

2-16
Figure2-9 Attaching mounting bracket C to the switch (S5120V3-10P-PWR-LI)
Figure2-10 Attaching mounting bracket D to the switch (S5120V3-10P-LI)
3. Attach the front mounting bracket to the other side of the chassis in the same way.
Mounting the switch in the rack
1. Wear an ESD wrist strap and make sure it makes good skin contact and is reliably grounded.
2. Verify that the front mounting brackets have been securely attached to the switch chassis. See
"Attaching the front mounting brackets to the switch."
3. Attach cage nuts to the front rack posts.
4. One person supports the bottom of the switch, and moves the switch to an appropriate position
based on the installation positions of the front mounting brackets.

2-17
5. Another person uses user supplied M6 screws and cage nuts to attach the mounting brackets
to the rack and verifies that the brackets are level and secure. As a best practice, use a torque
of 30 kgf-cm (2.94 Nm) to fasten the M6 screws.
Figure2-11 Mounting the switch in the rack (port-side mounting position for mounting
brackets A on an S5120V3-52P-PWR-LI)
Figure2-12 Mounting the switch in the rack (port-side mounting position for mounting
brackets B on an S5120V3-28S-HPWR-EI)

2-18
Figure2-13 Mounting the switch in the rack (power supply-side mounting position for
mounting brackets B on an S5120V3-28S-HPWR-EI)
Figure2-14 Mounting the switch in the rack by using mounting brackets C
(S5120V3-10P-PWR-LI)