Appendix C  Installing a lightning arrester for a network interface· 1

Tools 1

Installation procedure· 1

Precautions 2

If an outdoor network cable should be directly led to the switch, serially connect the lightning arrester for the network interface before you plug this cable into the switch to prevent possible damages to the switch caused by lightning strike.

Tools

·           Philips or flat-blade screwdrivers

·           Multimeter

·           Diagonal cutting plier

Installation procedure

1.      Remove the protective paper on one side of the double-faced adhesive tape and stick it on the shell of the arrester, remove the protective paper on the other side and stick the arrester on the chassis of the switch. Keep the arrester as close to the grounding screw of the switch as possible.

2.      Cut the ground cable of the arrester of a suitable length according to the distance between the arrester and the grounding screw and then fasten the cable on the grounding screw tightly.

3.      Use the multimeter to verify whether the ground cable of the arrester has a close touch with the grounding screw and chassis of the switch.

4.      Follow the instruction of the arrester to connect the arrester for network interface with a transit cable. Pay attention to the direction: IN end of the cable is connected to the arrester while OUT end of the cable is connected to the switch. After the connection, check whether the LEDs of the interface modules are normal.

5.      Tie the cables together with nylon clips.

Figure 1 Installation of a lightning arrester for network interface

Precautions

To ensure performance of the lightning arrester for network interface during installation, observe the following rules:

·           Properly connect the lightning arrester for network interface, with IN connecting to the lightning arrester while OUT connecting to the network interface of the switch.

·           Correctly ground the lightning arrester. When connecting the ground cable, make sure that the ground cable is of a proper length and has a good touch with the grounding screw of the switch. Check the ground cable with a multimeter after connection.

·           Install adequate lightning arresters for network interfaces. When there are more than one network interface connecting to outdoor cables, install a lightning arrester for each of the network interfaces to guard the interfaces against possible damages.