impedance (including the grounding system) coupling. To minimize the influence of
interference sources on the router, you should take the following into consideration:
Take effective measures to protect the power system from the power grid system.
Separate the protection ground of the router from the grounding device or lightning
protection grounding device of the power supply equipment as far as possible.
Keep the router far away from radio stations, radar, and high-frequency devices
working in high current.
Use electromagnetic shielding when necessary.
Lightning Protection
Although many measures have been taken to protect the device from lightning, if the lightning
intensity exceeds a certain range, damage to the router may still happen. To protect the router
from lightning better, you are recommended to do as follows:
Ensure the PGND cable of the chassis is well grounded. Refer to “Connecting the
PGND Cable” in Chapter 4 “Installing the Router”.
Ensure the grounding terminal of the AC power socket is well grounded.
Install a lightning arrester at the input end of the power supply to enhance the
lightning protection capability of the power supply.
Install a special lightning arrester at the input end of outdoor signal lines (for
example, E1 line) to which interface modules of the router are connected to enhance
the lightning protection capability.
For the installation of a power lightning arrester and a signal lightning arrester, refer to
“Installing a Power Lightning Arrester (Lightning Protection Busbar) (Optional)” and “Selecting
and Installing a Signal Lightning Arrester (Optional)” in Chapter 4 “Installing the Router”.
Cabinet-Mounting Requirements
When installing the router in a cabinet,
Install the router in an open cabinet if possible. If you install the router in a closed
cabinet, make sure that the cabinet is equipped with a good ventilation system.
Install the router on a shelf in view of the heavy weight of the router.
Make sure that the cabinet is sturdy enough to support the weight of the router and
installation accessories.
Make sure that the size of the cabinet is appropriate for the router, and that there is
enough clearance around the left and right panels of the router for heat dissipation.
For the sake of heat dissipation and device maintenance, it is recommended that
the front and rear of the cabinet should be at least 0.8 m (31.5 in.) away from walls
or other devices, and that the headroom in the equipment room should be no less
than 3 m (118.1 in.).
Safety Precautions
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