H3C S7500 Series Manuale utente
H3C EPON OLT Installation Manual Table of Contents
Table of Contents
Chapter 3 Installation Preparation...............................................................................................3-1
3.1 Safety Information.............................................................................................................. 3-1
3.1.1 General Safety Recommendations ......................................................................... 3-1
3.1.2 Safety of Electricity.................................................................................................. 3-1
3.1.3 Safety of Moving...................................................................................................... 3-1
3.1.4 Wearing an ESD Wrist Strap................................................................................... 3-2
3.1.5 Safety of Laser ........................................................................................................ 3-3
3.2 Examining Installation Site................................................................................................. 3-3
3.2.1 Temperature/Humidity Requirements ..................................................................... 3-3
3.2.2 Cleanness Requirements........................................................................................ 3-3
3.2.3 Anti-static Requirements ......................................................................................... 3-4
3.2.4 Grounding Requirements ........................................................................................ 3-4
3.2.5 Power Supply Requirements................................................................................... 3-5
3.3 Installation Planning........................................................................................................... 3-5
3.3.1 Installation Space Requirement .............................................................................. 3-5
3.3.2 Rack-Mounting Requirements................................................................................. 3-5
3.4 Installation Tools................................................................................................................ 3-6
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H3C EPON OLT Installation Manual Chapter 3 Installation Preparation
Chapter 3 Installation Preparation
3.1 Safety Information
To avoid damage to human body and devices, please read the following safety
recommendations carefully before installing S7500 Series Ethernet Switches. The
following recommendations do not cover all the possible hazardous conditions.
3.1.1 General Safety Recommendations
zTurn OFF all the powers and remove all the power cords before opening the
chassis.
zKeep the chassis clean and dust-free.
zKeep the chassis and installation tools away from walk areas.
zDo not wear loose clothing, jewelry (including ring and necklace, and so on) or any
other things that could get caught in the chassis when you install and maintain the
switch.
3.1.2 Safety of Electricity
zLook carefully for possible hazards in your work area, such as ungrounded power
extension cables, missing safety grounds, and moist floors.
zLocate the emergency power-off switch in the room before installation. Shut the
power off at once in case accident occurs.
zUnplug all the power cords and external cables before moving the chassis.
zBetter not maintain the equipment alone when it has been powered by electricity.
zNever assume that power is disconnected from a circuit. Always check.
zDo not place the switch on a moist area and avoid liquid flowing into the switch.
3.1.3 Safety of Moving
S7500 Series Switches are rather big and heavy, so follow the recommendations below
when moving them.
zTurn off all the powers and remove all the power cords before opening the chassis.
zDo not move the switch alone. Work with another person.
zMove the switch slowly and stably. Never move suddenly or twist your body.
zMove the switch at stable and consistent paces with your peer. Keep balance of
your body.
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H3C EPON OLT Installation Manual Chapter 3 Installation Preparation
Caution:
Move a switch by holding the handles on the side of the chassis, instead of the power
handlers or by putting fingers into the vent of chassis, or you may damage the switch
chassis or even your body when you carry the switch, since the power handler and vent
are not designed to bear the weight of the entire switch.
3.1.4 Wearing an ESD Wrist Strap
To prevent the electric component from being damaged by the electrostatic discharge
(ESD), take ESD measures for the area where the switch is located and note the points
below:
zAlways wear an ESD wrist strap when installing the parts, especially the electric
printed circuit boards, of the switch.
zTake the edge of the circuit board. Do not touch the components or the electric
printed circuit.
Take the following steps to use the ESD wrist strap.
Step 1: Put your hand through the wrist strap and wear it.
Step 2: Strain and tighten the strap, ensure that it makes good contact with your skin.
Step 3: Insert it into the ESD wrist strap hole in the switch chassis or attach the alligator
clips to the grounding screw of the chassis.
Step 4: Make sure the ESD wrist strap is well grounded.
Note:
The ESD wrist strap is shipped with the S7500 Series Ethernet Switches.
There is an ESD wrist strap hole above the SRPU slot of the S7500 Series Switch
chassis. The grounding screw is located on the power distribution box sit on the back
floor of the chassis.
Caution:
For safety case, check the resistance of the ESD wrist strap. The resistance between
human body and the ground should be 1 to 10M ohm.
3-2
H3C EPON OLT Installation Manual Chapter 3 Installation Preparation
3.1.5 Safety of Laser
Some LPUs of S7500 Series Ethernet Switches have optical interfaces. In operating
status, it is prohibited to stare into the open optical interface because the laser being
transmitted through the optical fiber will produces a small beam of light, it has very high
power density and is invisible to human eyes, when a beam of light enters the eye,
retina may be burned.
Caution:
Staring at the laser beam inside the fiber could hurt your eyes.
3.2 Examining Installation Site
S7500 series Ethernet switches can only be used indoors. To ensure that the switch
works normally and expand its service life, the installation environment shall meet the
requirements below.
3.2.1 Temperature/Humidity Requirements
To ensure the normal operation and service life of a switch, a certain level of
temperature and humidity should be maintained in the equipment room. If the humidity
in the equipment room is too high for a long time, it will lead to bad insulation of the
insulating material or even creepage. Sometimes, the mechanical performance
changes of material, the rustiness and corrosion of some metal parts are also likely to
occur. If the relative humidity is too low, the captive screws may become loose due to
the shrinkage of the insulation washers. Meanwhile, the electrostatic is likely to be
produced in the dry environment, which will jeopardize the CMOS circuit of the switch.
The higher the temperature, the greater the damage it will do on the switch. High
temperature for a long time will speed up the aging process of the insulation materials,
greatly lower the reliability of the switch and therefore affect its service life seriously.
3.2.2 Cleanness Requirements
Dust is a big harm for the normal operation of the switch. The indoor dust accumulated
on the chassis can cause electrostatic adsorption, resulting in the poor contact of the
connector or metal contact point. This happens more frequently when the relative
indoor humidity is low, which will not only shorten the service life of the switch, but also
cause communication failure.
The required specifications on dust content and particle diameter in an equipment room
are shown in the following table.
3-3
H3C EPON OLT Installation Manual Chapter 3 Installation Preparation
Table 3-1 Required specifications on dust content in an equipment room
Mechanical active material Unit Content
Dust particle particle/m³ ≤3 x 104(No visible dust on desk in
three days)
Note: Dust particle Diameter ≥5µm
Except the requirements on dust, rigorous requirements on ingredient of salts, acids
and sulfides of air in an equipment room are also set. These harmful gases will speed
up the metal corrosion and the aging processes of certain parts. The equipment room
should be protected from the invasion of harmful gases such as SO2, H2S, NO2, NH3
and Cl2, the value limits of which are shown in the following table:
Table 3-2 Value limits on harmful gas contents in an equipment room
Gas Maximum (mg/m3)
SO20.2
H2S 0.06
NH30.05
Cl20.01
3.2.3 Anti-static Requirements
Any possible interference sources, no matter outside or inside the system, affect the
switch in use may in a way of capacitance coupling, inductance coupling, radiation of
electromagnetic wave, common impedance (including the grounding system) coupling
or conducting line (power line, signaling line and transmission line etc.).Therefore, the
following should be considered:
zAdopt effective measures to protect the power supply system against the power
grid interference.
zSeparate the working ground of the switch from the ground device of the power
supply equipment or lightning-protection ground device as far as possible.
zKeep the switch far away from the radio launcher, radar launcher, and
high-frequency devices working in high currents.
If necessary, adopt electromagnetic shield.
3.2.4 Grounding Requirements
A good grounding system is the basis for a switch to work stably and reliably and the
important guarantee of lightning protection, anti-interference and ESD.A user should
provide good grounding system for the switch.
3-4
H3C EPON OLT Installation Manual Chapter 3 Installation Preparation
3.2.5 Power Supply Requirements
S7500 Series Switches adopt N+1 redundancy power backup. And
1) AC power module parameters:
zAC input voltage: 100 to 240 VAC, 50/60Hz
zMax. voltage: 90 to 264 VAC, 50/60Hz
zMax. output power: 450 W
2) DC power module parameters:
zAC input voltage: -48 to -60 VDC
zMax. voltage: -36 to -72 VDC
zMax. output power: 450 W
3.3 Installation Planning
Since S7500 Series Ethernet Switch is a kind of complex equipment, it is necessary to
make a good plan and arrangement concerning installation position, networking
measure, power supply and cabling before installing it.
3.3.1 Installation Space Requirement
For better heat dissipation and equipment maintenance, it is recommended to keep the
front and back of the switch more than 1 meters inclusive away from the walls or other
devices. There can be other devices located beside the left and right of the switch.
However, you shall keep the left and right of the switch more than 0.8 meters inclusive
away from the walls. If the optional rack will be installed, the clear height of equipment
room should be more than 3 meters inclusive.
3.3.2 Rack-Mounting Requirements
Before rack-mounting a switch, make sure the rack meets the following requirements:
zBetter mount a switch in an open rack. However, if you mount a switch in a closed
rack, make sure of good heat dissipation system.
zMake sure the rack stands steadily enough to well support the switch and
accessories.
zMake sure that the switch fits the rack size. Leave some spaces beside the left and
right panels of the switch for chassis heat dissipation.
3-5
H3C EPON OLT Installation Manual Chapter 3 Installation Preparation
3.4 Installation Tools
Table 3-3 Required installation tools list
Type Name Tools
Measure and
lineation tools
Long tape, ruler (of 1 meter), gradienter, marking
pen, powder marker and pencil
Drills A percussion drill, several auxiliary drill bits, a
vacuum cleaner
Fastening
tools
Flat-blade screwdriver P4-75mm
Phillips screwdriver P1-100mm, P2-150mm and
P3-250mm
Box-end wrench M5
Box-end wrench M6
Box-end wrenches (10-12) or open-end wrench
(10-12)
Small tools
Sharp-nose pliers, diagonal pliers, vices,
hand-held electric drill, file, handsaw, crowbar
and rubber hammer
General tools
Auxiliary tools Hair brush, tweezers, paper knife, hand bellows,
electric iron, solder wire, fork and ladder
Special tools ESD wrist strap, cable stripper, crimping pliers, RJ-45 crimping
pliers and wire punchdown tool
Tools for
fiber-optic
cleaning
Lint-free paper, and optical fiber End-Face microscope
Instruments Multimeter, 500 V Meg-ohmmeter (used to measure the insulation
resistance), error detector, optical power meter and earth
resistance tester
Note:
The instruments and tools are not shipped with S7500 Series Ethernet Switches and
need to be prepared by the users.
3-6
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