Digital key telephone connecting apparatus and method in a digit

Details Digital key telephone connecting apparatus and method in a digit Digital key telephone connecting apparatus and method in a digit

1995-10-10

1998-06-02

Chan, Wing F.

Telephonic communications

Multi-line or key substation system with selective switching...

379171, 379177, 370271, 370463, H04M 100

Patent

active

057612870

ABSTRACT:
In connecting a first digital key telephone to a second digital key telephone in a digital key telephone system, an additional connection module provides data transmission for a call between the first digital key telephone and the second digital key telephone. Synchronizing signal terminals and a B clock terminal of a transmitter of the connection module are connected to a transmitter of the first digital key telephone. Data transmission and receiving terminals, a D clock terminal and an input/output control port of a microprocessor of the first digital key telephone are also connected to the transmitter of the connection module. A transformer is connected to the second digital key telephone through a transmission line. The transformer is connected to transmission input and output terminals of the transmitter of the connection module through capacitors and diodes.

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