TPA97 - Analog field telephone

The analog field telephone may be used in two different modes. Local battery (LB) - this mode, when the phone is supplied from its own battery, enables communication with a similar phone (such as TP25) or a field exchange using the double phone line. Common battery (CB) - in this mode the phone is connected to the automatic phone exchange and is supplied by the line. In this mode you can use the built-in keyboard to call another user. The device features both pulse (P) and tone (T) dialing. It may therefore be operated also with the usual phone exchange. Other operating features: pulse or tone dialing, redialing, 10-number memory, double-tone ringer with eight volume levels, visual ringing indication, volume regulation in jumps, battery indication, keying and modulation of the connected transceiver via the phone cable.