PHONE UNIT OF PBX SYSTEM WITH PROTECTION AGAINST PARALLEL CONNECTION Russian patent published in 2024 - IPC H04M3/16 

FIELD: telephone communication.

SUBSTANCE: invention relates to protecting a telephone communication channel from parallel connection of an additional telephone set. To do this, a telephone set of the PBX system with protection against parallel connection, comprising a PBX subscriber line, a ringing device, a power bridge, a lever switch, an electronic bell, a loudspeaker, a counter-circuit, a microphone amplifier, a reception amplifier, a handset consisting of a microphone and a telephone, a switch type of dialling, a keyboard, a controller, a common bus, a tone dialling unit, a liquid crystal indicator, a memory unit and a clock and calendar unit, additionally includes a protection unit included in the break of the subscriber line of the automatic telephone exchange and consisting of a voltage sensor, a processing unit, a current sensor, a switch and an RC circuit.

EFFECT: implementation of the purpose of the claimed solution.

1 cl, 1 dwg