Contents

2 Preparing for installation· 2-1

Safety recommendations· 2-1

General safety recommendations· 2-1

Electricity safety· 2-1

Moving safety· 2-1

ESD prevention· 2-2

Laser safety· 2-2

Examining the installation site· 2-2

Weight support 2-2

Temperature· 2-2

Humidity· 2-3

Cleanliness· 2-3

EMI 2-4

Grounding· 2-4

Power 2-4

Cooling· 2-4

Space· 2-5

Installation accessories· 2-5

 

2 Preparing for installation

H3C S12500G-AF Switch Series includes the following models:

·     S12516G-AF

·     S12508G-AF

·     S12504G-AF

Safety recommendations

To avoid possible bodily injury and equipment damage, read Compliance and Safety Manual provided with the switch and all safety recommendations in this chapter carefully before installation. The recommendations do not cover every possible hazardous condition.

General safety recommendations

·     Keep the switch clean and dust-free.

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

·     Make sure the ground is dry and flat and anti-slip measures are in place.

·     Keep the switch and installation tools away from walk areas.

·     Do not wear loose clothing, jewelry (for example, necklace) or any other things that could get caught in the switch when you install and maintain the switch.

Electricity safety

·     Clear the work area of possible electricity hazards, such as ungrounded power extension cables, missing safety grounds, and wet floors.

·     Locate the emergency power-off switch in the room before installation so you can quickly shut power off when an electrical accident occurs.

·     Remove all external cables, including power cords, before moving the chassis.

·     Do not work alone when the switch has power.

·     Before performing a task that is hazardous when power is present, make sure the switch is completely powered off.

Moving safety

WARNING! Do not hold the handle of a fan tray, a power module, or a module, or the air vents of the chassis to move the switch. Any attempt to move the switch with these parts might cause equipment damage and even bodily injury.

 

Remove power modules, modules, and all external cables, including the power cords, before moving the chassis. As a best practice, use a mechanical lift, such as forklift truck, to move the chassis.

If no mechanical lift is used, follow these guidelines to move the chassis:

·     Cooperate with a minimum of four people to move the chassis.

·     Lift the chassis by using the chassis handles or by supporting the bottom from the two sides.

·     Lift and put down the chassis slowly and never move suddenly.

ESD prevention

To prevent the electric component from being damaged by electrostatic discharge (ESD), follow these guidelines:

·     Ground the switch reliably. For how to ground your switch, see "Grounding the switch."

·     Always wear an ESD wrist strap and make sure it is reliably grounded when installing field replaceable units (FRUs). For how to use an ESD wrist strap, see "Attaching an ESD wrist strap."

·     Hold a module by its edges. Do not touch any electronic components or printed circuit.

·     If you are not to use a module, put it in an antistatic bag and keep it secure.

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.

 

Examining the installation site

The switch must be used indoors. To ensure correct operation and long service life of your switch, make sure the installation site meets the following requirements.

Weight support

Make sure the floor or ground at the installation site can support the combined weight of the switch and the rack. The total weight of the switch includes the chassis and its components (for example, modules and power modules) and accessories. For the weights of the switch and its components, see "Chassis view and technical specifications" in H3C S12500G-AF Switch Series Hardware Information and Specifications.

To mount the switch in a rack, select slide rails that can support the total weight of the switch.

To assess the load-bearing requirements for the floor and slide rails, take potential system expansion (for example, adding more modules) also in consideration.

Temperature

	CAUTION: If condensation appears on the chassis when you move it to a high-temperature environment, dry the chassis before powering it on to avoid short circuits.

 

If the temperature in the equipment room is too high, too low, or changes dramatically, the device reliability is reduced and its service lifetime is shortened. For long-term, highly available operation of the device, make sure temperature and humidity in the equipment room meets the requirements described in Table2-1.

Table2-1 Temperature requirements

Temperature	Range
Operating temperature	0°C to 40°C (32°F to 104°F)
Storage temperature	–40°C to +70°C (–40°F to +158°F)

 

Humidity

Maintain appropriate humidity in your equipment room, as described in Table2-2.

·     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 problems including loose mounting screws and circuit failure.

Table2-2 Humidity requirements

Humidity	Range
Operating humidity	5% to 95%, noncondensing
Storage humidity	5% to 95%, noncondensing

 

Cleanliness

Dust buildup on the chassis might result in electrostatic adsorption, which causes poor contact of metal components and contact points. In the worst case, electrostatic adsorption can cause communication failure.

Table2-1 Dust concentration limits in the equipment room

Substance	Particle diameter	Concentration limit
Dust particles	≥ 0.5 µm	≤ 3.5 × 106 particles/m3
Dust particles	≥ 5 µm	≤ 3 × 104 particles/m3
Dust (suspension)	≤ 75 µm	≤ 0.2 mg/m3
Dust (sedimentation)	75 µm to 150 µm	≤ 1.5 mg/(m2h)

 

Corrosive gases can accelerate corrosion and aging of components. Make sure the corrosive gases in the equipment room do not exceed the concentration limits as shown in Table2-2.

Table2-2 Corrosive gas concentration limits in the equipment room

Gas	Average concentration (mg/m3)	Maximum concentration (mg/m3)
SO2	0.3	1.0
H2S	0.1	0.5
Cl2	0.1	0.3
HCI	0.1	0.5
HF	0.01	0.03
NH3	1.0	3.0
O3	0.05	0.1
NOX	0.5	1.0

 

EMI

All electromagnetic interference (EMI) sources, from outside or inside of the switch and application system, adversely affect the switch in the following ways:

·     A conduction pattern of capacitance coupling.

·     Inductance coupling.

·     Electromagnetic wave radiation.

·     Common impedance (including the grounding system) coupling.

To prevent EMI, perform the following tasks:

·     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 switch far away from radio transmitting stations, radar stations, and high-frequency devices.

·     Use electromagnetic shielding, for example, shielded interface cables, when necessary.

Grounding

Correctly grounding the switch is crucial to lightning protection, anti-interference, and ESD prevention. Use a good grounding system for the switch. Make sure the resistance between the chassis and the ground is less than 1 ohm.

For more information about grounding the switch, see "Grounding the switch."

Power

Perform the following tasks to meet the power requirements:

1.     Calculate the system power consumption.

The system power consumption varies by module types and quantities. For more information about the system power consumption, see "Chassis views and technical specifications" in H3C S12500G-AF Switch Series Hardware Information and Specifications.

2.     Identify the number of power modules based on the system power consumption.

The total maximum output power of all power modules must be greater than the system power consumption. For more information about available power modules, see "FRUs and compatibility matrixes" in H3C S12500G-AF Switch Series Hardware Information and Specifications.

3.     Verify that the power system at the installation site meets the requirements of the power modules, including the input method and rated input voltage. For more information about power module specifications, see "FRUs and compatibility matrixes" in H3C S12500G-AF Switch Series Hardware Information and Specifications.

Cooling

Plan the installation site for adequate ventilation:

·     Reserve a minimum clearance of 30 cm (11.81 in) around the inlet and outlet air vents.

·     The rack for the switch has a good cooling system.

·     The installation site has a good cooling system.

·     Verify that the airflow design of the chassis meets the airflow design of the installation site.

Figure2-1 Airflow through the switch (S12508G-AF switch)

(1) Chassis air intake direction	(2) Chassis air exhaust direction

 

Space

For easy installation and maintenance, follow these space requirements:

·     Reserve a minimum clearance of 1.2 m (3.94 ft) between the rack and walls or other devices.

·     Make sure the rack has enough space to accommodate the switch.

For more information about switch dimensions and rack requirements, see "Switch dimensions and rack requirements."

Installation accessories

Before installation, make sure you have all the required installation accessories.

Table2-3 Installation accessories

Product code	Description	Quantity	Applicable device models
2150A08S	S12516G-AF mounting brackets	1 pair	S12516G-AF
2150A0AX	S12508G-AF mounting brackets	1 pair	S12508G-AF
2150A0BW	S12504G-AF mounting brackets	1 pair	S12504G-AF
2113A0YV	S12500G-AF service module filler panel	·     S12516G-AF: 16 ·     S12508G-AF: 8 ·     S12504G-AF: 4	All S12500G-AF models
2114A09Q	S12500G-AF power module filler panel	·     S12516G-AF: 16 ·     S12508G-AF: 8 ·     S12504G-AF: 4	All S12500G-AF models
2150A0AB	S12500G-AF cable management bracket	·     S12516G-AF: 32 ·     S12508G-AF: 16 ·     S12504G-AF: 8	All S12500G-AF models
·     26020141 ·     26020075	M6 screw and cage nut	·     S12516G-AF: 30 kits ·     S12508G-AF: 14 kits ·     S12504G-AF: 12 kits	All S12500G-AF models
2110A042	Releasable cable tie	1	All S12500G-AF models
2110A05W	Velcro strap	1	All S12500G-AF models
0404A0EE	Grounding cable	1	All S12500G-AF models
28050001	ESD wrist strap	1	All S12500G-AF models
04042967	Console cable	1	All S12500G-AF models
0221A003 0221A004	Tweezers for installing and removing transceiver modules	1 set	All S12500G-AF models
14990101	SFP/SFP+ dust plug	Same number as the SFP/SFP+ ports	All S12500G-AF service modules with SFP/SFP+ ports
1499A00C	QSFP dust plug	Same number as the QSFP ports	All S12500G-AF service modules with QSFP ports