Panasonic HYBRID IP-PBX KX-TDA50 - Manual (Page 67)

2.4 Information about the Extension Cards
Installation Manual 67
2.4.2 DLC4 Card (KX-TDA5171)
Function
4-port digital extension card for DPTs, DSS consoles, a VPS, and PT-interface CSs. *1
Accessories and User-supplied Items
Accessories (included): Extension Bolt × 1, Strap × 1
User-supplied (not included): RJ11 connector
Note
For details about connecting the CS, refer to "2.7.7 Connecting a Cell Station to the Hybrid IP-PBX".
Pin Assignments
RJ11 Connector
*1 The PT-interface CS can be connected to the Hybrid IP-PBX using a cable like a PT.
Signal Name Function
D1 Data port (High)
D2 Data port (Low)
– Reserved
To extension
RJ11
4 1
D2 D1