Panasonic KX-TDA100 Installation Manual page 72

2.2 Installation of the Hybrid IP-PBX
Outside Installation
Trunk
PT-interface CS
If you install an extension outside of the building, the following precautions are recommended:
a.
Install the extension wire underground.
b.
Use a conduit to protect the wire.
Note
The surge protector for an extension and CS is different from that for a trunk.
Installation of an Earth Rod
Surge Protector
Trunk
Earthing
(Underground)
72 Installation Manual
(Main Building)
Surge Protector
Terminal
Board
Extn.
SLT
PT
CS
Hybrid
Wire
IP-PBX
Earth Rod
Trunk
Hybrid
IP-PBX
Extn.
Extn.
(Another Building)
Extn.
PT-interface CS
Surge
Protector
Earth
Extn.: Extension Line
SLT
PT
CS