Panasonic Pure IP-PBX KX-TDE600 Installation Manual page 127

Outside Installation
CO Line
SLT
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 CO lines.
Installation of a Grounding Rod
Surge Protector
CO Line
Grounding
Wire
(Underground)
Document Version 2009-12
(Main Building)
Surge Protector
CO Line
Terminal
Board
Extn.
Extn.
Extn.
PT
CS
PBX
Grounding Rod
3.2.16 Surge Protector Installation
Extn.
PBX
Surge
Protector
Ground
Extn.: Extension Line
(Another Building)
SLT
PT
PT-interface CS
CS
Installation Manual 127