Hardware Installation and Reference Guide
Preparation before Installation
2.2.3 Cleanness Requirements
Dust poses the top threat to the running of the equipment. The indoor dust falling on the equipment may be adhered by
the static electricity, causing bad contact of the metallic joint. Such electrostatic adherence may occur more easily when
the relative humidity is low, not only affecting the use life of the equipment, but also causing communication faults. The
following table shows the requirements for the dust content and granularity in the equipment room.
Maximum Diameter (
μm )
0.5
1
3
5
Concentration Limit (particles/m
3
)
1.4 x 10
7 x 10
2.4 x 10
1.3 x 10
Apart from dust, the salt, acid and sulfide in the air in the equipment room must also meet strict requirements; as 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 (for example, SO
2
, H
2
S, NO
2
and Cl
2
), whose requirements are
listed in the following table.
Gas
Average (mg/m
3
)
Maximum (mg/m
3
)
SO
2
0.2
1.5
H
2
S
0.006
0.03
NO
2
0.04
0.15
NH
3
0.05
0.15
Cl
2
0.01
0.3
2.2.4 Anti-interference Requirements
Although much has been done in RG-PBOX to resist interference, great damage may be caused to the equipment
when the interference exceeds a certain limit. Various interference sources from outside the system, affect the working
power adapter in the conductive ways such as capacitive coupling, inductive coupling, electromagnetic radiation,
common-inpedance (including the grounding system) coupling and cables ( including the power, signal and output
cables).
Keep the equipment away from high-power radio transmitter, radar transmitting station, and high-frequency
large-current device.
Measures must be taken to isolate static electricity. For example, use a shield cable as the interface cable.
2.2.5 System Grounding Requirements
A good grounding system is the basis for the stable and reliable operation of the RG-PBOX. It is the key to prevent
lightning stroke and resist interference. Please carefully check the grounding conditions on the installation site
according to the grounding requirements, and perform grounding properly as needed.
A properly-connected grounding system servers as the primary guarantee for prevention of lightning stroke and
resistance to interference. Therefore, please ensure correct grounding.
2.2.6 EMC Grounding
The ground required for EMC design includes shielding ground, filter ground, noise and interference suppression, and
level reference. All the above constitute the comprehensive grounding requirements. The grounding resistance should
be less than
1Ω. One grounding point is reserved at the back of the chassis.
Figure 2-1 RG-PBOX Power Adapter Grounding
