Panasonic KX-TDA15 Getting Started page 6

1.2 Unpacking
Necessary tools (not supplied):
Telephone cable for extension connection:
Diameter of cable
(ø 0.4 mm to ø 0.6 mm)
ø 0.5 mm
ø 0.5 mm
ø 0.5 mm
The maximum length of the cable may vary depending on the type of the cables and installation
conditions.
An RS-232C or USB cable for PC connection
Connectors (RJ45/RJ11)* for trunk and extension connections
* The connector type may be RJ45 or RJ11 depending on the country/area.
Note
Use a twisted pair cable for the RJ45 or RJ11 connector.
6 Getting Started
Maximum length of cable
1128 m for SLT
720 m for KX-T7600 series
229 m for other DPT, APT and DSS Console