Panasonic KX-TDA15 Installation Manual page 21

Extension Connection Cable
Dimension
Weight (when fully mounted)
SLT
DPT
APT
PT-interface CS
DSS Console and Add-on Key Module 1-pair wire (D1, D2)
275 mm (W) × 376 mm (H) × 117 mm (D)
Under 3.5 kg
1.4 Specifications
1-pair wire (T, R)
1-pair wire (D1, D2) or
2-pair wire (T, R, D1, D2)
2-pair wire (T, R, D1, D2)
1-pair wire (D1, D2)
Installation Manual 21