Panasonic KX-TD500 User Manual page 16

Method 3
Digital Proprietary Telephone
OVERVIEW
4-conductor wiring cord
Connect pins "T", "R", "D1" and "D2".
1.3 Adding Another Telephone in Parallel
DIG ITA
L SUP
ER HYB
RID
SYS
TEM RUN
OFF
LIN
E
ALA RM
2-conductor wiring cord
Connect pins "T" and "R".
Single Line Telephone
Figure 6:
15