V-Tech VT-BDU Manual - Manual (Page 4)

3.3 Extended star connection
BDU
BDU
4
AC ~
AC ~ AC ~
AC ~
AC ~
AC ~
AC ~
AC ~
VT-BDU
4B 3Y 2W 1R
4B 3Y 2W 1R
4B 3Y 2W 1R
4B 3Y 2W 1R
VT
-BDU
JW/VP1
JW/VP2
JW/VP3
JW/OS
HI 75R 150R
SET
-3Y
SET-3Y
VT-BDU
4B 3Y 2W 1R
4B 3Y 2W 1R
4B 3Y 2W 1R
4B 3Y 2W 1R
VT
-BDU
JW/VP1
JW/VP2
JW/VP3
JW/OS
HI 75R 150R
SET
-3Y
SET-3Y
Note1:
first BDU
second BDU
Note2:
-4-
Note1:SET-3Y set to 75R when the distance from door station to the first BDU is within
50 meters,otherwise set to 150R.
Note2:SET-3Y set to 75R when the distance from the first BDU to the second BDU is
within 50 meters,otherwise set to 150R.