In the  actual network  environment, you  may need cable  outdoors  and  indoors, and 
the requirements for cabling outdoors and indoors are different. A reasonable cabling 
system can decrease the damage of induced lightning to devices.
Note: It's not recommended using Ethernet cables outdoors. When cabling outdoors, 
please use a signal lightning arrester.
Requirements for Cabling Outdoors
 
Aerial cabling without safeguard is not allowed.
 
It’s not allowed  cabling  down the building to connect network devices in different 
 
floors.
Outdoor cables  should  be buried and  paved  to  the  indoor through  basement.  A 
 
piece of steel wire should be paved underground along the pipe and connected to 
the lightning protection terminal of the building for shielding. Before connecting the 
cable to the device, install a signal lightning arrester on the corresponding port.
When an aerial cable is set up, the cable should be through a metal pipe (15m long 
 
at least)  before coming into the  building. The  two ends of this metal pipe  should 
be grounded. Before  connecting the cable  to the device, install a signal  lightning 
arrester on the corresponding port.
It’s not necessary to pave STP cables through pipes. The shielded layer of STP cable 
 
should be well grounded. Before connecting the cable to the device, install a signal 
lightning arrester on the corresponding port.
Lightning Protection