Table of Contents

Chapter 3 Installation Preparations. 3-1

3.1 Safety Instructions. 3-1

3.1.1 General Instructions. 3-1

3.1.2 Electrical Safety. 3-1

3.1.3 Handling Safety. 3-1

3.1.4 Anti-static Safety. 3-2

3.1.5 Laser Safety. 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. 3-5

3.2.5 Power Supply Requirements. 3-5

3.3 Installation Planning. 3-5

3.3.1 Space Requirement 3-5

3.3.2 Rack-Mounting Requirements. 3-5

3.4 Installation Tools. 3-6

 

Chapter 3  Installation Preparations

3.1  Safety Instructions

To avoid body injury and device damage, please read the following safety recommendations carefully before installing your S7502. The recommendations do not cover every possible hazardous condition.

3.1.1  General Instructions

l           Turn off all powers and remove all power cables 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 etc.) or any other things that could get caught by the chassis when you install and maintain the switch.

3.1.2  Electrical Safety

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 first when accident occurs.

l           Unplug all the power cables and external cables before moving the chassis.

l           Better not maintain the equipment alone when it is powered on.

l           After shut off a switch, always check and make sure it is powered off.

l           Do not place the switch on a moist area and avoid liquid flowing into the switch.

3.1.3  Handling Safety

The S7502 is rather big and heavy, so follow the recommendations below when moving them.

l           Turn off all powers and remove all the power cables before moving 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.

 

 

3.1.4  Anti-static Safety

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 pay attention to the following:

l           Always wear an ESD-preventive wrist strap when installing the components, 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-preventive 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-preventive 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-preventive wrist strap is well grounded.

 

 

 

3.1.5  Laser Safety

Some LPU of the S7502 has optical ports. In operating status, it is prohibited to stare into the open optical port because the laser emitted from it has very high power density and is harmful to your retina.

 

 

3.2  Examining Installation Site

The S7502 can only be used indoors. To ensure that the switch works normally and expand its service life, the installation environment shall meet the requirements described in the coming sections.

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 and for a long time, it may go bad insulated or even power leakage may occur. Sometimes, high humidity may result in material mechanical performance changing or metal parts rusted. 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.

Table 3-1 Temperature/humidity requirements

Specification	Range
Operating temperature	0°C to 45°C (32°F to 113 °F)
Relative humidity (noncondensing)	10% to 90%

 

3.2.2  Cleanness Requirements

Dust does serious harm to the normal operation of the switch. The indoor dust accumulated on the chassis can cause electrostatic adsorption, resulting in poor contact between connectors or metal contact points. 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 failures.

The required specifications on dust density and particle diameter in an equipment room are shown in the following table.

Table 3-2 Required specifications on dust density in an equipment room

Mechanical active material	Concentration limit (particles/m³)
Dust particle	≤3 x 104 (No visible dust on desk over 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 Table 3-2:

Table 3-3 Limits on harmful gas ingredients in an equipment room

Gas	Max. (mg/m3)
SO2	0.2
H2S	0.006
NH3	0.05
Cl2	0.01

 

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:

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 current.

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 switch should be provided with good grounding system.

3.2.5  Power Supply Requirements

The S7502 provides 1+1 power redundancy backup.

For AC power modules:

l           Rated voltage range: 100 VAC to 240VAC, 50 Hz or 60 Hz

l           Input voltage range: 90 VAC to 264 VAC, 50 Hz or 60 Hz

l           Power output power: 300 W

For DC power modules:

l           Rated voltage range: –48 VDC to –60 VDC

l           Input voltage range: –36 VDC to –72 VDC

l           Max output power: 296 W

3.3  Installation Planning

Since the S7502 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  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 net 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:

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 enough spaces beside the left and right panels of the switch for chassis heat dissipation.

3.4  Installation Tools

Table 3-4 Required installation tools list

Tool classification	Tool purpose	Tool
General tools	Measure and lineation tools	Long tape, ruler (of 1 meter), level, 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 Socket wrench 5.0kgf.cm 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-preventive wrist strap, cable stripper, crimping pliers, RJ-45 crimping pliers and wire punchdown tool
Fiber cleaner tools	Tissue paper, microscope
Instruments	Multimeter, 500V Meg-ohmmeter (used to measure the insulation resistance), error detector, optical power meter and earth resistance tester