Viking TBB-1B Product Manual page 3

A. Low Loop Current
Low loop current from a VoIP ATA, cable company, or telco provided phone lines can cause some
alarm panels to go into an alarm state due to very low levels at the phone when in-use. Solve this
problem by wiring a TBB-1B as shown below. The TBB-1B increases the in-use voltage.
B. Low Idle Voltage
Low idle voltage from a VoIP ATA, cable company or telco provided phone lines can cause some
alarm panels to go into an alarm state. Solve this problem by wiring a TBB-1B as shown below. A
TBB-1B increases the idle voltage, converting 24 volt lines to 48 volt lines.
Alarm Panel Applications
Internal View of the TBB-1B
Internal View of the TBB-1B
4: Line Out to Phone
3: Line Out to Phone
2: Line In
1: Line In
4: Line Out to Phone
3: Line Out to Phone
2: Line In
1: Line In
3
Phones
Low Loop
Current
Phone Line
Alarm
Panel
Phones
Alarm
Panel
Low Voltage
Phone Line