Cleanness; Interference Resistance - Ruijie Reyee RG-NBS3100-24GT4SFP-V2 Installation Manual

Installation Guide
2.2.3

Cleanness

Dust poses a severe threat to the running of the device. The indoor dust falling on the device may be absorbed
by the static electricity, causing bad contact of the metallic joint. Such electrostatic absorption may occur more
easily when the relative humidity is low. This affects the device lifecycle and causes communication faults.
Table 2-2 lists the requirements for the dust content and granularity in the equipment room.
Table 2-2 Requirements for the Dust Content and Granularity in the Equipment Room
Dust
Diameter ≥ 0.5 µm
Diameter ≥ 0.5 µm
Apart from dust, the salt, acid, and sulfide in the air in the equipment room must also meet strict requirements.
This is because such poisonous substances may accelerate the corrosion of the metal and the aging of some
parts. The equipment room should be protected from the intrusion of harmful gases such as sulfur dioxide,
sulfured hydrogen, nitrogen dioxide, and chlorine. Table 2-3 lists the requirements.
Table 2-3 Requirements for Harmful Gases in the Equipment Room
Gas
SO
2
H S
2
NO
2
Cl
2
Note
The average and maximum values are measured for a week. The switch cannot be placed in the environment
with the maximum density for over 30 minutes every day.
2.2.4

Interference Resistance

The switch is vulnerable to external interface caused by capacity coupling, inductance coupling,
electromagnetic wave radiation, common impedance (including grounding system) coupling, and conducting
wires (including power cords, signal and output wires). Therefore, note the following points:

The AC power supplying system is the TN system. The single-phase three-wire socket with protecting
grounding must be used as the socket for the power supply to enable the device's upper filter circuit to
effective filter the power interface.

The switch should be far from high-power radio transmitting stations, radar stations and high-frequency and
large-current devices.

Electromagnetic shielding methods should be applied when necessary, such as using the shielded cable as
the interface cable.
Cables must be connected to interfaces inside the room to prevent damage to the device's signal ports

Unit Density
≤ 3.5 x 10
3
Particles/m
≤ 3 x 10
3
Particles/m
3
Average (mg/m
0.3
0.1
0.5
0.1
8
6
4
) Maximum (mg/m
1.0
0.5
1.0
0.3
Preparation before Installation
3
)