Ruijie RG-EG210G-E Series Routers Hardware Installation and Reference Guide
Preparation before Installation
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2.2.5 Grounding
A good grounding system is the basis for the stable and reliable operation of the RG-EG210G-E series router. It is the
chief condition 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 operations properly as required.
Safety Grounding
The equipment using AC power supply must be grounded by using the yellow/green safety grounding cable. Otherwise,
when the insulating resistance decreases the power supply and the enclosure in the equipment, electric shock may
occur.
The building must provide protective grounding connection to ensure that the device is connected to the protection
location.
CE warning: Operation of this equipment in a residential environment could cause radio interference.
Lightning Grounding
The lightning protection system of a facility is an independent system that consists of the lightning rod, download
conductor and the connector to the grounding system, which usually shares the power reference ground and
yellow/green safety cable ground. The lightning discharge ground is for the facility only, irrelevant to the equipment.
EMC Grounding
The grounding 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 resistance of earth wires
should be less than 1Ω. The RG-EG210G-E series router’s back plane is reserved with one grounding pole.
2.2.6 EMI
Electro-Magnetic Interference (EMI), from either outside or inside the equipment or application system, affects the
system in the conductive ways such as capacitive coupling, inductive coupling, and electromagnetic radiation.
There are two types of electromagnetic interference: radiated interference and conducted interference, depending on the
type of the transmission 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 either a part of the interfered system or a completely
electrically isolated unit. Conducted interference results from the electromagnetic wire or signal cable connection
between the source and the sensitive component, along which 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.
For the AC power supply system TN, single-phase three-core power socket with protective earthing conductors
(PE) should be adopted to effectively filter out interference from the power grid through the filtering circuit.
