Huawei Quidway S3000-EI Series Installation Manual page 74

Installation Manual
Quidway S3000-EI Series Ethernet Switches
III. Installation precautions
Fully consider the following items in the installation process, otherwise, the
performance of the lightning arrester for network port will be affected:
Lightning arrester for network port is installed in reverse direction. In practice, the
"IN" end should be connected to the outdoor network cable and the "OUT" end to
the network port on the switch.
Lightning arrester for the network port is not well grounded. The ground wire for
the arrester should be as short as possible, so to ensure its good contact with the
grounding screw of the switch. After the connection, use the multimeter to
confirm that.
The lightning arrester for the network port is not installed completely. If the switch
has more than one network ports to interconnect with other devices via cables
outdoor, you should install lightning arresters for all these network ports for
protection.
Appendix A Lightning Protection of the Switch
A-4