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DGS-8000 Series Hardware Installation Guide
EMC Ground
2.3.3
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. Two grouding
poles are reserved at the back,left and right sides respectively. The grouding poles are
pasted with conspicuous warning labels. For detais, see Figure 1-5 and Figure 1-6.
EMI Consideration
2.3.4
Various interference sources, from either outside or inside the equipment or application
system, affect the system in the conductive ways such as capacitive coupling, inductive
coupling, and electromagnetic radiation.
There are two types of electromagnetic interferences: radiated interference and conducted
interference, depending on the type of the propagation path.
When the energy, often RF energy, from a component arrives at a sensitive component via
the space, the energy is known as radiated interference. The interference source can be
both a part of the interfered system and a completely electrically isolated unit. Conducted
interference results from the electromagnetic wire or signal cable connection between the
source and the sensitive component, along the cable the interference conducts from one unit
to another. Conducted interference often affects the power supply of the equipment, but can
be controlled by a filter. Radiated interference may affect any signal path in the equipment,
and is difficult to shield.
1.
Effective measures should be taken for the power system to prevent the interference
from the electric grid.
2.
The working ground of the routers should be properly separated and kept as far as
possible from the grounding device of the power equipment or the anti-lightning
grounding device.
3.
Keep the equipment away from high-power radio transmitter, radar transmitting station,
and high-frequency large-current device.
4.
Measures must be taken to isolate static electricity.
Precaution for Fiber Connection
2.3.5
Before connecting the fibers, you should ensure that the type of optical connector and the
type of fibers match the type of the optical interface used. Moreover, you should pay
attention to the Tx and Rx directions of the fiber. The Tx end of this equipment should be
connected to the Rx end of the peer equipment, and the Rx end of this equipment to the Tx
end of the peer equipment.
Installation Tool Requirements
2.4
The following table shows installation tools.
Table 2-4 List of installation tools
Common tools
Special-purpose
tools
Cross screwdriver, straight screwdriver, related electric and
optical cables
Bolts, diagonal pliers, straps
Anti-static tool, anti-static glove, stripping pliers, crimping pliers,
crimping pliers for the crystal head, wire cutter
Chapter 2 Preparation before Installation
39
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