98CHAPTER A: LIGHTNING PROTECTION OF THE SWITCH
connected in right direction. When the red LED is on, use a multimeter to examine the polarity at the arrester’s power socket. If it is same as that of the power socket in the equipment room, it means that the arrester is not well grounded. If it is adverse to that of the power socket in the equipment room, it means that the arrester’s power socket is set to the reverse polarity. In this case, you should open the arrester’s power socket and correct the polarity. After that, if the red LED still alarms, it means that the arrester is still not well grounded.
Installing a Lightning
Arrester for the
Network Port
n A network port lightning arrester is specifically designed for an 10/100M electrical interface (an
Make sure, when connecting an outdoor AC power cord directly to the switch, that you connect a lightning arrester to the AC power (a socket strip with lightning protection) before you plug the AC power cord into the switch. This helps to prevent damage in the event of a lightning strike. Install your lightening arrester according to its manufacturer’s instructions.
Required tools
■Phillips screwdriver or
■Multimeter
■Tilted wire cutter
Installation procedure
1Remove the protection paper from one side of the
2Cut the arrester’s ground wire to the length of the distance between the arrester and the switch’s grounding screw so that you can securely tighten the ground wire to the switch’s grounding screw.
3Use the multimeter determine if the arrester’s ground wire connects properly chassis’s grounding screw.
4According to the instructions provided with your network port arrester, connect the arrester to switch using the cables (Make sure to insert the outdoor network cable into the arrester‘s IN end, and the cable that is connected to the switch into the arrester’s OUT end). Check that the arrester’s indicators display correctly.
5Use the nylon ties to bundle the cables neatly.
