Panasonic KX-TD816 Installation Manual page 100

2.4.8 Doorphone and Door Opener
Connection
Maximum cabling distance of the doorphone and the door opener line
Programming References
Feature References
2-68 Installation
The maximum length of the doorphone and door opener line that
connects to the main unit is shown below:
26 AWG: Under 70 m (230 feet)
24 AWG: Under 113 m (370 feet)
22 AWG: Under 180 m (590 feet)
22 AWG: Under 180 m (590 feet)
KX-TD1232 is illustrated as a main unit.
Notes The
Section 4, System Programming,
[607–608] Doorphone Ringing Assignment — Day / Night
Section 3, Features,
Door Opener
Doorphone
KX-T30865
Door Opener
Doorphone Call