Hardware Installation and Reference Guide Preparing for Installation
20
Note
For lightning protection, refer to Appendix 7.3.
EMC Grounding
Grounding required for electromagnetic compatibility includes shielded grounding, filter grounding, noise and
interference suppression, and level reference, which contribute to the overall grounding requirements. The
grounding resistance should be smaller than 1 ohm. The grounding lug is in the bottom right corner of the back
panel. It is marked with a conspicuous label.
Figure 2-1 EMC grounding
2.2.6 EMI Requirement
All interference sources, either from outside or inside of the device or application system, affect the device by
capacitive coupling, inductive coupling, or electromagnetic waves. Electromagnetic interference (EMI) occurs due
to electromagnetic radiation or conduction, depending on 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 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. The interference is conducted from one unit to another unit through
cables. 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. The device adopts
Class A EMI.
Take interference prevention measures for the power supply system.
Keep the switch far away from the lightening protection and grounding system of the power device
Keep the device away from high-power radio transmitting station, radar launcher and high-frequency
current devices.
Measures must be taken to isolate static electricity.
2.3 Fiber-Optic Cable Connection Requirement
Make sure the model of the SFP module and fiber-optic cable matches with the SFP port. The transmit port on
the local device should be connected to the receive port on the peer device and vice versa.
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