KR970004534A - Automatic call connection circuit in general telephone with multiple trunk lines and its method - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to an automatic call connection circuit of a general telephone having a plurality of trunk lines.

2. The technical problem to be solved by the invention

To solve the cost problem when installing a new key phone system and to provide an automatic call connection circuit and a method of connecting a CO line to a subscriber line to make a call automatically without interrupting other people's calls. .

3. Summary of Solution to Invention

Loop current detection means for controlling the generation of loop current detection signal by detecting use of several ordinary telephones connected to a general telephone having a plurality of trunk lines, and a predetermined trunk line in response to a predetermined switching switch signal of a predetermined telephone among the various ordinary telephones. A trunk line switch means for controlling a call connection with the trunk line, detection means for detecting an incoming call signal coming through the trunk line and controlling the generation of a ring signal, a state of use of the trunk line, the loop current detection signal and the ring signal And a control means for generating the predetermined switching switch signal to control the switching operation of the trunk line switch means.

4. Important uses of the invention

It is used in the automatic call connection circuit of a general telephone having a plurality of trunk lines.

Description

Automatic call connection circuit and method in a general telephone with multiple trunk lines

Since this is an open matter, no full text was included.

1 is a configuration diagram of an automatic call connection circuit according to the present invention, Figure 2 is a flow chart showing the automatic call connection method according to the present invention.

Claims (6)

An automatic call connection circuit for automatically connecting several ordinary telephones to a regular telephone having a plurality of trunk lines, the automatic call connection circuit comprising: loop current detecting means for controlling the generation of a loop current detection signal by detecting the use of the various ordinary telephones; Trunk line switch means for controlling a telephone connection with a predetermined trunk line in response to a predetermined switching switch signal of a predetermined telephone among the various general telephones; Ring detecting means for detecting an incoming call signal coming through the trunk line and controlling the generation of a ring signal; And control means for inputting the use state of the trunk line, the loop current detection signal, and the ring signal to generate the predetermined switching switch signal to control the switching operation of the trunk line switch means. An automatic call connection method for automatically connecting several ordinary telephones to a regular telephone having a plurality of trunk lines, wherein the predetermined trunk line switch connected to the multiple ordinary telephones is switched on when the multiple telephones are on-hook. Forming a currency; If only one of the various telephones is in the off-hook state, the predetermined trunk line switch corresponding to the predetermined one phone is switched on to form a call, and the predetermined trunk line switch of the remaining telephones in the on-hook state is turned on. A second process of switching on the trunk line switch excepting the above; A third step of receiving a ring signal through an arbitrary ring detecting means and forming a call by switching on a trunk line switch except for the predetermined trunk line switch connected to the various general telephones; And a fourth process of detecting when all the trunk lines are in use and controlling the trunk line switch unit of the corresponding telephone which is not loaded to the switching-off state. The method of claim 2, wherein the first step comprises: detecting the on-hook state by a loop current detecting means connected to the various ordinary telephones to generate an on-hook loop current signal, and the control means generates the on-hook loop current signal. -Inputting a hook loop current signal to generate a switching switch signal to switch on the trunk line switch to form a call. 3. The method of claim 2, wherein the second process further comprises the steps of: detecting the off-hook state of the predetermined one telephone only by the loop current detecting means to generate an off-hook loop signal, and wherein the control means is configured to generate the off-hook. Inputting a loop signal to switch on the corresponding trunk line switch to form a call; and the control means inputs an on-hook loop current of the remaining telephones in the on-hook state to switch on the other trunk lines except for the trunk line switch. To form a currency. 3. The method according to claim 2, wherein the third process further comprises the steps of: the arbitrary ring detecting means inputting a call call signal from a predetermined trunk line to generate a ring signal; and wherein the control means inputs the ring signal to the various general telephones. Switching on a CO line switch connected to the method. The method of claim 2, wherein the fourth process comprises: detecting from the ring detecting means that all trunk lines are being used, generating a trunk line switch off signal, and wherein the control unit inputs the trunk line switch off signal to generate a trunk line switch; And off to maintain the first trunk line and the second trunk line switches of the telephone set in the non-call state in the switched off state. ※ Note: The disclosure is based on the initial application.