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Table of Contents
Chapter 3 Installation Preparation
3.1.1 General Safety Recommendations
3.1.4 Wearing an ESD Wrist Strap
3.2 Examining Installation Site
3.2.1 Temperature/Humidity Requirements
3.2.3 Anti-static Requirements
3.2.5 Power Supply Requirements
3.3.1 Installation Space Requirement
3.3.2 Rack-Mounting Requirements
To avoid damage to human body and devices, please read the following safety recommendations carefully before installing S7500 Series Ethernet Switches. The recommendations do not cover every possible hazardous condition.
l Turn OFF all the powers and remove all the power cords before opening the chassis.
l Keep the chassis clean and dust-free.
l Keep the chassis and installation tools away from walk areas.
l Do 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.
l Look carefully for possible hazards in your work area, such as ungrounded power extension cables, missing safety grounds, and moist floors.
l Locate the emergency power-off switch in the room before installation. Shut the power off at once in case accident occurs.
l Unplug all the power cords and external cables before moving the chassis.
l Better not maintain the equipment alone when it has been powered by electricity.
l Never assume that power is disconnected from a circuit. Always check.
l Do not place the switch on a moist area and avoid liquid flowing into the switch.
S7500 Series Switches are rather big and heavy, so follow the recommendations below when moving them.
l Turn off all the powers and remove all the power cords before opening the chassis.
l Do not move the switch alone. Work with another person.
l Move the switch slowly and stably. Never move suddenly or twist your body.
l Move the switch at stable and consistent paces with your peer. Keep balance of your body.
Caution:
Hold the handle at the back of the chassis, instead of holding the power handlers or putting fingers into the vent of chassis when moving the switch.
Since the power handler and vent have not been designed to bear the weight of the entire chassis, it may hurt the switch or even your body when you carry the switch.
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:
l Always wear an ESD wrist strap when installing the parts, especially the electric printed circuit boards, of the switch.
l Take 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.
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.
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.
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.
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.
Table 3-1 Required specifications on dust content in an equipment room
|
Mechanical active material |
Unit |
Content |
|
Dust particle |
particle/m |
≤3 x 104 (No visible dust on desk in three days) |
|
Note: Dust particle Diameter ≥ 5 m |
||
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) |
|
SO2 |
0.2 |
|
H2S |
0.06 |
|
NH3 |
0.05 |
|
Cl2 |
0.01 |
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:
l Adopt effective measures to protect the power supply system against the power grid interference.
l Separate the working ground of the switch from the ground device of the power supply equipment or lightning-protection ground device as far as possible.
l Keep the switch far away from the radio launcher, radar launcher, and high-frequency devices working in high currents.
If necessary, adopt electromagnetic shield.
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.
S7500 Series Switches adopt N+1 redundancy power backup. And
1) AC power module parameters:
l AC input voltage: 100 to 240 VAC, 50/60Hz
l Max. voltage: 90 to 264 VAC, 50/60Hz
l Max. output power: 450 W
2) DC power module parameters:
l AC input voltage: -48 to -60 VDC
l Max. voltage: -36 to -72 VDC
l Max. output power: 450 W
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.
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.
Before rack-mounting a switch, make sure the rack meets the following requirements:
l Better mount a switch in an open rack. However, if you mount a switch in a closed rack, make sure of good heat dissipation system.
l Make sure the rack stands steadily enough to well support the switch and accessories.
l Make sure that the switch fits the rack size. Leave some spaces beside the left and right panels of the switch for chassis heat dissipation.
Table 3-3 Required installation tools list
|
Type |
Name |
Tools |
|
General 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 |
|
|
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.
