30If part of the AC power line is routed outdoors, use a power strip with lightning protection to connectthe AC power cord of the router to the AC power line to protect the router from being damaged bylightning strikes.You can attach the power strip to the rack, workbench, or wall of equipment room.After you connect the AC power cord from the router to a socket on the power strip, verify that thegreen RUN LED on the strip is on and the red LED is off.If the red LED is on, use a multimeter to check the polarity of the wires in the power socket for wrongconnections. If the zero wire (left) and the live wire (right) are correctly connected, check for missinggrounding connection.Figure 30 Power strip with lightning protection(1) Working LED (green) On means the circuit is operating correctly; off means the circuit isdamaged.(2) Grounding/pole detectionLED (red)On indicates a wrong wire connection (the wire is not grounded or the liveline and null line are reversely connected), and you need to check thepower supply line.(3) Power switch(4) IEC standard socket It is used to connect to the power supply in the equipment room through apower cord.(5) Overload automaticprotectorThe protector automatically opens the electric circuit when the currentexceeds the threshold and closes the electric circuit when the current dropsbelow the threshold.(6) Multifunctional socket It is used to connect the power module of the router.Installing a surge protectorCAUTION:Ground the surge protector as near as possible. The grounding resistance must be less than 4ohms. The grounding resistance must be less than 1 ohm if there are special groundingrequirements.N NN NL LL L
