H3C S3100-8C-Sl Quick Start Manual page 80

Quick Start (For Japan)
H3C S3100 Series Ethernet Switches
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.
Chapter 4 Lightning Protection
4-7
of the Switch