3Com 3C17539 Installation Manual

Also see for Switch 8810: Product guide Datasheet Product guide Configuration guide Command reference guide

Contents

98 CHAPTER A: LIGHTNING PROTECTION OF THE SWITCHconnected in right direction. When the red LED is on, use a multimeter toexamine the polarity at the arrester’s power socket. If it is same as that of thepower socket in the equipment room, it means that the arrester is not wellgrounded. If it is adverse to that of the power socket in the equipment room, itmeans 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. Afterthat, if the red LED still alarms, it means that the arrester is still not wellgrounded.Installing a LightningArrester for theNetwork Portn A network port lightning arrester is specifically designed for an 10/100M electricalinterface (an RJ-45 connector in this case) Ethernet port.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 withlightning protection) before you plug the AC power cord into the switch. Thishelps to prevent damage in the event of a lightning strike. Install your lighteningarrester according to its manufacturer’s instructions.Required tools■ Phillips screwdriver or flat-module screwdriver■ Multimeter■ Tilted wire cutterInstallation procedure1 Remove the protection paper from one side of the double-faced adhesive tape,and stick the tape to the surface of the arrester. Remove the protection paper fromthe other side, and stick the arrester onto the switch’s chassis as close to thegrounding screw as possible.2 Cut the arrester’s ground wire to the length of the distance between the arresterand the switch’s grounding screw so that you can securely tighten the ground wireto the switch’s grounding screw.3 Use the multimeter determine if the arrester’s ground wire connects properlychassis’s grounding screw.4 According to the instructions provided with your network port arrester, connectthe arrester to switch using the cables (Make sure to insert the outdoor networkcable into the arrester‘s IN end, and the cable that is connected to the switch intothe arrester’s OUT end). Check that the arrester’s indicators display correctly.5 Use the nylon ties to bundle the cables neatly.