Panasonic HYBRID IP-PBX KX-TDA50 - Manual (Page 69)

2.4 Information about the Extension Cards
Installation Manual 69
2.4.4 PLC4 Card (KX-TDA5175)
Function
4-port extension card for APTs, DSS consoles, and a VPS.
Accessories and User-supplied Items
Accessories (included): Extension Bolt × 1, Strap × 1
User-supplied (not included): RJ11 connector
Pin Assignments
RJ11 Connector
Signal Name Function
D1 Data port (High)
T Tip
R Ring
D2 Data port (Low)
To extension
RJ11
4 1
R T
D2 D1