MP3900X Series Router Installation Manual
Appendix
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2020 Maipu, all rights reserved
C-17
C1.4 Anti-Interference Requirement
The various interference sources no matter from the exterior of the router or from the
interior router affect the router through capacitance coupling, inductance coupling,
electromagnetic radiation, public impedance (including grounding system) coupling,
and lead (such as power cables, signal lines and output lines). Therefore, pay attention
to the following items:
⚫
Take valid anti-grid disturbance measures for the power system.
⚫
The working place of the router had better not be used with the grounding settings
of power devices or lightning protection grounding settings and the distance
between them had better be as long as possible.
⚫
Be away from the strong power radio transmitters, radar transmitter, and high
frequency high-current equipment; take electromagnetic shielding methods when
necessary.
C1.5 Grounding Requirement
The well grounding system is the basis for the router to run stably and reliably, and the
important guarantee for lightning protection, anti-interference, and anti-static of the
router. The user should provide the well grounding system for the router. The
resistance between the router chassis and the ground should be smaller than 1 ohm.
C2 Requirements for Power Supply
C2.1 AC Power Supply Requirement
⚫
The low-voltage power supply system should adopt the three-phase five-wire or
single-phase three-wire system. The voltage of the low-voltage power supply
system is 110V/220V and the frequency is 50Hz/60Hz.
⚫
It is required to adopt the un-interruptible power, such as UPS (Uninterrupted Power
Supply), as the AC backup power supply. The AC backup power and AC power
should keep the same phase and the switching time with the AC should be smaller
than 10 ms. Otherwise, the router may restart or reset.
⚫
The AC capacity of the equipment room should consider the work current and faulty
current of the router. Ensure that the independent router has the independent AC
power distribution protection device. The configuration protection switch should be
