The TBB-1B will boost talk battery voltage up to 48 V DC, and current up to 26mA on single analog line extensions behind PABX's and electronic key systems. This is helpful for powering line powered devices such as touch tone dialers and emergency phone s on low voltage and/or low loop current extensions.
When the TBB-1B is being used, the power LED lights extra bright to show activity. The TBB-1B is not compatible with Pulse/Rotary dialing.
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Run line powered devices such as handsfree phones, touch tone hot-line dialers, digital announcers, etc.
Increase maximum loop length on analog PABX/KSU stations
Use with wireless doorbox devices