Panasonic KX-TC1040LAB Service Manual page 20

50Ω
AC(RF)
SEND
1.969
DC
1.973
AC(AF)
AC(AF)
AC(AF)
DC
AC(RF)
SEND
DC 2.596V TALK
2.613V STBY
IC101
SEND
25.53V
255mV
IC301
AC(AF)
AC(AF)
AC(AF)
DC
2.046
2.05
TX DATA
AC(AF)
BETWEEN
BOTH
TERMINALS