H3C Technologies H3C SR6600 - Manual (Page 40)

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If the red LED is on, use a multimeter to check the polarity of the wires in the power socket for wrong
connections. If the zero wire (left) and the live wire (right) are correctly connected, check for missing
grounding connection.
Figure 33 Power strip with lightning protection
(1) Working LED (green) On means the circuit is operating correctly; off means the circuit is
damaged.
(2) Grounding/pole detection LED (red) On indicates a wrong wire connection (the wire is not grounded or
the live line and null line are reversely connected), and you need to
check the power supply line.
(3) Power switch
(4) IEC standard socket
It is used to connect to the power supply in the equipment room
through a power cord.
(5) Overload automatic protector The protector automatically opens the electric circuit when the
current exceeds the threshold and closes the electric circuit when
the current drops below the threshold.
(6) Multifunctional socket It is used to connect the power module of the router.
Installing a surge protector (optional)
CAUTION:
Ground the surge protector as near as possible. The grounding resistance must be less than 4 ohms. The
grounding resistance must be less than 1 ohm if there are special grounding requirements.
Generally, you need to connect a surge protector before connecting a signal cable to the router. This can
protect electronic devices against surge over-voltage resulting from lightning strokes and other
interferences, and minimize impact on the router.
The surge protector is serially connected to a signal cable, so the surge protector must satisfy the
requirements of network performance indexes such as data transmission bandwidth, as well as the
lightning protection performance requirement. Before installing a surge protector, consider such
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