VT-BDU user manual
1. Introductions
The BDU unit is designed for VT video door phone system, for the purpose of video
repeat and video signal impedance matching. The main features of the BDU are as
follows:
● Distribute the video signal when multi monitor are installed.
● Muitiple BDU can be used when multiple distributor nodes need to be applied.
● Work as a repeater in a long wiring distance system.
2. Terminal Description
JW/VP1
JW/VP2
JW/OS
JW/VP3
VT-BDU
4B
4B
4B
JW/VP2
JW/VP3
JW/VP1
3Y
3Y
3Y
2W
2W
2W
1R
1R
1R
150R
75R
SET-3Y
HI
VT-BDU
VT System Distributor
4B
JW/OS
3Y
2W
1R
86.0
SET-3Y:
●
86.0
Video impedance setting; total 3 settings can be available.75R,150R and HI.
45.0
1). connect one BDU. Set to 75R when the distance from door station to BDU is within
50 meters,otherwise set to 150R.(note that set to HI when the video signal is weak)
2).connect multi BDU.Set to 75R when the distance between BDU is within 50
meters,otherwise set to 150R.(note that set to HI when the video signal is weak)
-1-
SET-3Y
JW/OS:
●
●
●
●
Input port; Connect to the door station.
JW/VP1:
JW/VP2:
JW/VP3:
Output port; connect to indoor monitors or next BDU unit.
Output port; connect to indoor monitors or next BDU unit.
Output port; connect to indoor monitors or next BDU unit.
3. System Topology
3.1 Long distance video repeat
Max.50 meters
VT-BDU
VT System Distributor
4B
4B
4B
JW/VP2
JW/VP1
JW/OS
3Y
3Y
2W
1R
3Y
2W
2W
1R
1R
SET-3Y
4B
3Y
2W
1R
Max.50 meters
VT-BDU
JW/VP3
150R
75R
HI
AC ~
SET-3Y
4
AC ~
VT-BDU
4
Note:SET-3Y set to 75R when the distance from door station to BDU is within 50
meters,otherwise set to 150R.
-2-
3.2 Star distribute connection
VT-BDU
VT System Distributor
AC ~
AC ~
AC ~
AC ~
4B3Y2W1R
4
SET-3Y
JW/OS
4B3Y2W1R
JW/VP1
4B3Y2W1R
JW/VP2
SET-3Y
150R
75R
HI
JW/VP3
4B3Y2W1R
VT-BDU
Note:SET-3Y set to 75R when the distance
fro m doo r sta t ion t o BDU i s wit hin 50
meters,otherwise set to 150R.
-3-
AC ~
VT-BDU
AC ~
3.3 Extended star connection
BDU
second BDU
Note1:
4B3Y2W1R
SET-3Y
150R
75R
HI
JW/OS
JW/VP1
JW/VP2
JW/VP3
VT-BDU
4B3Y2W1R
4B3Y2W1R
4B3Y2W1R
VT-BDU
4
first BDU
SET-3Y
AC ~ AC ~
BDU
AC ~
AC ~
AC ~
Note2:
4B3Y2W1R
SET-3Y
SET-3Y
150R
75R
HI
JW/OS
JW/VP1
JW/VP2
JW/VP3
VT-BDU
4B3Y2W1R
4B3Y2W1R
4B3Y2W1R
VT-BDU
AC ~
AC ~
AC ~
Note1:SET-3Y set to 75R when the distance from door station to the rst 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.
-4-
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