apparatus and method of connection of phone keys in a digital telephone system, digital keys

摘要

in connecting a first phone to a second phone digital keys in a digital key telephone system, digital keys.provided is an additional module to implement data transmission for a call to the first telephone from the second telephone digital keys to digital keys.terminal synchronization signals and a terminal of the clock b a first transmitter module is connected to an additional second transmitter of the first phone with digital keys.transmission and reception of data terminals.a terminal of the clock or synchronization of control and port of entry / exit of a microprocessor of the first phone and digital keys are connected to the first transmitter.a transformer is connected to the second phone keys via a digital transmission line.the transformer is connected to the terminals of the entry and exit of transmission of the first transmitter through capacitors and diodes.