Cleanness; Electromagnetic Susceptibility - H3C S5100-SI Series Installation Manual

Installation Manual
H3C S5100-SI/EI Series Ethernet Switches
High temperature is the most undesirable condition, because it accelerates aging
of insulation materials and can thus significantly lower reliability and service life of
your switch.
For the detailed temperature/humidity requirements for the products, see section 1.5
System Features of the S5100 Series.

2.2.2 Cleanness

Dust is a hazard to the operating safety of your device. The dust accumulated on the
chassis can be adsorbed by static electricity and result in poor contact of metal
connectors or metal contact points. When the relative indoor humidity is low, especially,
electrostatic adsorption is more likely to happen. This can not only shorten the service
life of your device but also cause communications failures. The following table lists the
dust concentration limit.
Table 2-1 Dust concentration limit in the equipment room
Substance
Dust
Note: The dust particle size is greater than or equal to 5 μm
Besides dust, there are rigorous limits on the content of harmful substances that can
accelerate the corrosion and aging of metals, such as salts, acids, and sulfides in the
air in the equipment room, and the equipment room must be protected against
ingression of harmful gases such as SO
requirement, see the following table.
Table 2-2 Harmful gas limits in the equipment room
SO
2
H S
2
NH
3
Cl
2

2.2.3 Electromagnetic Susceptibility

The operation of your switch can be affected by external interferences, such as
conducted emission by capacitance coupling, inductance coupling, electromagnetic
wave radiation, and common impedance (including the grounding system) coupling,
Unit
Particles/m³
Gas
2-2
Chapter 2 Preparing for Installation
Concentration limit
4
≤ 3 × 10
(No visible dust on the
tabletop for three days)
, H S, NH , and Cl
2 2 3
Maximum concentration (mg/m
0.2
0.006
0.05
0.01
. For the specific
2
3
)