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IMPORTANT: Electronic devices are susceptible to lightning and power station electrical surges from both
the AC outlet and the telephone line. It is recommended that a surge protector be installed to protect against
such surges.
Open the plastic cover.
Step 1.
Connect the analog extension to the LINE IN screw terminals.
Step 2.
Connect the line powered device to the PHONE screw terminals.
Step 3.
Connect the provided 12VDC adapter to the power jack.
Step 4.
Snap the cover back into place.
Step 5.
Internal View of the TBB-1B
* 12V DC Adapter
(included)
The TBB-1B is designed to boost talk battery voltage and loop current of a single analog line. The
TBB-1B achieves this by creating its own 48VDC talk battery supply that is set up as a 26mA current
source. An analog phone line can be in three different states: the idle state, the ringing state, and the
in-use state. The TBB-1B operated these three states like this:
Starting with the idle state; no matter what the incoming talk battery voltage is, the TBB-1B will supply
48VDC talk battery out to the on-hook phone. This is helpful for devices such as alarm panels that want
to see high talk battery voltage as an indication the analog phone line is in good working condition.
In the ringing state, the TBB-1B provides a "copper-thru" path from input to output. This allows both
the ringing signal and caller ID signals to simply pass through the unit.
In the in-use state, the TBB-1B seizes the incoming analog line with a "gyrator" circuit, which provides
a DC off hook state to the incoming analog line. At the same time, allowing the AC audio signal to freely
pass through to the TBB-1B's 26mA current source which is feeding the off hook phone device. So, no
matter what the incoming loop current is, the TBB-1B will output 26mA of loop current to the off hook
phone.
In the idle and ringing state, the TBB-1B power LED lights blue. When in the in-use state, the power
LED lights extra bright.
Installation
(2) #6x3/4 panhead
screws (included)
4: Line Out to Phone
3: Line Out to Phone
2: Line In
1: Line In
* IMPORTANT: For emergency phone applications, use an
uninterruptible power source.
Operation
2
Line Powered
Device
Analog PABX/KSU
Extension
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