KR100396284B1 - Switch having paging function through dedicated line and control method thereof - Google Patents

Abstract

PURPOSE: A switch having a paging function through a dedicated line and a control method thereof are provided to perform the paging function between switches, connected by the dedicated line, through a paging equipment of an object switch. CONSTITUTION: If a subscriber of an origination switch dials a subscriber number of a paging equipment(108) to a termination switch through a dedicated line, the origination switch calls the termination switch through the dedicated line. The termination switch forms a channel between a subscriber port of the paging equipment(108) and the dedicated line in response to the call, and controls the paging equipment(108) as an operation standby state. The origination switch transmits a voice message inputted from the origination subscriber to the termination switch through the dedicated line. The termination switch transmits the voice message received from the origination switch to the paging equipment(108).

Description

Exchanger with broadcasting function via leased line and its control method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exchange system, and more particularly, to an exchange system having a paging function in an exchange system comprising exchanges connected to each other by a dedicated line and a control method thereof.

In general, a private branch exchange such as a keyphone system has a broadcasting function in addition to a basic function of providing an extension call and a trunk line call to a subscriber. The broadcasting function is a function that a desired subscriber can broadcast a desired message through broadcasting equipment connected to the exchange.

The PBX also provides leased lines that are not connected to the trunk line by connecting to another trunk line with a leased line. To this end, the private branch exchange has a dedicated line circuit called a "tie (TIE) circuit" which relays a dedicated line. Dedicated line circuits used for leased line relay are divided into R / D (ring down), E & M and B / W (both way) according to a signaling method. In an exchange system composed of exchanges connected to each other by such a dedicated line, a leased line call is made by directly calling a subscriber of the opposite exchange which wants to make a call.

In this way, while a call can be made via a dedicated line during the exchange period, only the subscriber of the exchange can select and use the broadcast equipment. This is because the broadcasting equipment is not connected to the subscriber port unlike the subscriber, and thus the broadcasting equipment can not be called from another exchange.

Meanwhile, in a company having a plurality of branch offices, a private branch exchange is installed in each of the head office and branch offices, and the exchange is operated by connecting with a dedicated line as described above. At this time, the head office or one of the branch offices may instruct or inform the employees of all or some of the other regions.

When the same message is to be transmitted to all or a part of subscribers of other exchanges as described above, it is necessary to transmit a message to a subscriber of the other exchange even though a broadcasting function is provided for each exchange as described above. There was. In addition, there is a problem that the message may not be properly transmitted or may be conveyed inaccurately.

Accordingly, the present invention provides an exchange capable of broadcasting through a broadcasting equipment of a counterpart exchange between exchanges connected to each other by a dedicated line, and a control method thereof.

According to an aspect of the present invention, there is provided a method of connecting a broadcast equipment to a subscriber port in each of exchanges, so that when a subscriber of an exchange exchanges subscriber numbers of broadcasting equipment with another exchange through a dedicated line, And broadcasts the message of the calling subscriber through the broadcasting equipment. It also detects the formation of a call between the leased line and the broadcasting equipment and informs the calling subscriber visually.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Many specific details are set forth in the following description and the annexed drawings to provide a more thorough understanding of the present invention, such as specific circuit elements and configurations, process flows, and the like. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. Further, the detailed description of known functions and configurations that may unnecessarily obscure the gist of the present invention will be omitted.

FIG. 1 is a block diagram of an exchange according to an embodiment of the present invention. In a conventional private exchange connected to a trunk line and connected to other exchanges by a private line, the broadcasting equipment 108 is connected to a subscriber port of the subscriber circuit 106 . The CPU (Central Processing Unit) 100 performs overall operation control according to the broadcasting function of the present invention including a normal exchange function. The memory unit 102 stores a program for performing a control operation of the CPU 100 and initial setting data, and temporarily stores processing data during the operation of the CPU 100. [ The switching circuit 104 is controlled by the CPU 100 to switch various tones and voice data to form a communication path. The subscriber circuit 106 is controlled by the CPU 100 and interfaces with the subscriber telephones and exchange equipment 108 during the exchange of calls. The broadcast equipment 108 is connected to one of the subscriber ports of the subscriber circuit 106 and controlled by the CPU 100 so that the voice message input through the switching circuit 104 and the subscriber circuit 106 is supplied to a speaker ) And broadcast it. The loudspeaker is installed in the required places, e.g. offices. A ring generator 110 generates a ring signal and supplies it to the subscriber circuit 106. The tone supplier 112 is controlled by the CPU 100 and generates various tone signals and outputs them to the switching circuit 104. [ A DTMF (Dual Tone Multi-Frequency) transmitter 114 generates a DTMF signal according to data input from the CPU 100 and outputs the DTMF signal to the switching circuit 104. The DTMF receiver 116 decodes the DTMF signal received through the switching circuit 104 and applies the decoded DTMF signal to the CPU 100. The leased line circuit 118 is controlled by the CPU 100 and interfaces a call connection via a leased line connected to other exchanges. In the embodiment of the present invention, the dedicated line circuit 118 is described as an E & M system. The CO line circuit 120 is controlled by the CPU 100 and sees the CO line in a free state to form a CO line communication line and interfaces the CO line connection with the CO line.

FIG. 2 is a circuit diagram of a response display device according to an embodiment of the present invention. The response display device 202 is added to a typical signaling circuit 200 provided in a dedicated line circuit 118 of the E & M system. The response display device 202 is installed outside the exchange and detects the formation of a call through a leased line and visually informs the calling subscriber.

Normally, the E & M method separates the call line and the signaling line from each other, and the signaling line consists of the E line and the M line. Also, the signaling line is separated from the transmission and reception, and the transmission is made by the E line and the transmission is made by the M line.

A signaling circuit 200 for signaling the E & The relay RY controlled by the CPU 100 of the first figure is connected between the M line and the ground and the resistor R1 and the capacitor C1 are connected in parallel with the relay RY. The CPU 100 transmits the signaling signal to the counterpart exchange by turning the relay RY on / off. A light emitting diode of a resistor R2 and a photo coupler PT1 is connected between the E line and a talk power source of -48 V. A light receiving transistor of the photocoupler PT1 and a resistor R3 are connected between the power source Vcc and the ground. Stee is connected. The CPU 100 detects the signaling signal received from the counterpart exchange by the output of the light receiving transistor of the photocoupler PT1.

The response display device 202 added to the above signaling circuit 200 is constituted by connecting a resistor R4 and a light emitting diode LED1 between the power source Vcc and the collector terminal of the light receiving transistor of the photocoupler PT1. The light emitting diode (LED1) emits light when an answer back signal according to signaling is received from the other exchange.

FIG. 3 shows a processing flow of an originating exchange according to an embodiment of the present invention. When the exchange described in the first aspect is an originating exchange, that is, when a subscriber of the exchange calls a broadcasting equipment of another exchange through a dedicated line And the CPU 100 shown in FIG.

FIG. 4 shows a processing flow of a destination switching system according to an embodiment of the present invention. When the switching system according to the first embodiment is a destination switching system, that is, when the broadcasting equipment 108 is called from another switching system via a leased line, (100) according to an embodiment of the present invention.

The operation of the first to fourth embodiments according to the present invention will now be described in detail. In the following description, the number of the subscriber port to which the broadcasting equipment is connected is referred to as a " broadcasting subscriber number "for convenience.

If a subscriber of a certain exchange wishes to broadcast to another exchange through a leased line, the subscriber dials the subscriber number of the other exchange as the subscriber's telephone. At this time, the dialed subscriber becomes the originating subscriber and the exchange to which the originating subscriber is subscribed becomes the originating exchange. The other exchange is also the destination exchange.

At this time, the CPU 100 of the originating exchange senses the subscriber number dialing of the counterpart exchange of the calling subscriber through the subscriber circuit 106 and the DTMF receiver 116, and in step 300, the relay RY of the dedicated line circuit 118, And calls to the opposite party destination exchange through a dormant dedicated line connected to the destination exchange. Then, the CPU 100 of the originating exchange confirms reception of the response signal from the destination exchange in step (302).

At this time, the CPU 100 of the destination exchange senses that the paging signal is received from the originating exchange through the photocoupler PT1 of the dedicated line circuit 118, and controls the switching circuit 104 in step 400, Of the subscriber ports of the subscriber's terminal and the subscriber port to which the broadcasting equipment 108 is connected. At this time, the CPU 100 of the destination exchange controls the broadcasting equipment 108 to be in an operation standby state. Then, the CPU 100 of the destination exchange controls the relay RY of the dedicated line circuit 118 to transmit a response signal to the originating exchange.

The response signal transmitted from the destination exchange is detected by the photocoupler PT1 of the dedicated line circuit 118 of the originating exchange so that the CPU 100 of the originating exchange verifies that the response signal is transmitted to the originating exchange. The switching circuit 104 is controlled to connect the call path between the calling subscriber and the dedicated line.

At this time, according to the light emission of the light emitting diode (LED1), the calling subscriber can confirm that the broadcasting equipment (108) of the destination switching center is in the standby state and the communication path is formed. The calling subscriber then sends a voice message that he wants to communicate to the people on the other exchange side. At this time, the voice message is transmitted to the broadcasting equipment 108 of the destination switching center through a dedicated line, thereby being broadcasted.

Therefore, people in the area where the called party exchange can listen to the message of the calling subscriber.

When the calling subscriber ends the message transmission and terminates the call, the CPU 100 of the originating exchange and the terminating exchange respectively restores the call path in steps (306) to (308) and (404) to (406) .

As described above, the present invention is advantageous in that it is possible to simultaneously broadcast the same message to all or a part of subscribers of another exchange by being able to broadcast through the broadcasting equipment of the counterpart exchange between exchanges connected to each other by a dedicated line .

1 is a block diagram of an exchange according to an embodiment of the present invention;

FIG. 2 is a circuit diagram of a response display device according to an embodiment of the present invention.

FIG. 3 is a flow chart of the process of the originating exchange according to the embodiment of the present invention.

FIG. 4 is a flowchart of a process of a destination switching center according to an embodiment of the present invention;

Claims (7)

An exchange system comprising exchange units connected to each other by dedicated lines, The broadcasting equipment of each of the exchanges is connected to the subscriber port so that when a subscriber of an exchange exchanges a subscriber number of the broadcasting equipment with another exchange through the dedicated line, And broadcasting the message of the calling subscriber through the broadcasting equipment. The switching center according to claim 1, further comprising a display device for detecting formation of a call between the dedicated line and the broadcasting equipment and visually informing the calling subscriber of the formation. 3. The exchange according to claim 2, wherein the exchanges are connected by dedicated E & M lines. The switching center according to claim 3, wherein the display device comprises a light emitting diode which is caused to emit light by a response signal transmitted from a destination switching center to an originating exchange according to formation of a call between the dedicated line and the broadcasting equipment. A broadcast function control method of an exchange system comprising exchange units each having a broadcast equipment connected to a subscriber port by dedicated lines, In response to the subscriber of any exchange among the exchanges dialing the subscriber number of the broadcasting equipment to another exchange through the dedicated line, calling the corresponding originating exchange through the dedicated line to the destination destination exchange; The destination exchange establishes a call path between a subscriber port of the broadcasting equipment and the dedicated line in response to a call and controls the broadcasting equipment to be in an operation standby state; Transmitting, by the originating exchange, a voice message input from the calling subscriber to the destination switching center through the dedicated line; And transmitting the voice message received from the originating exchange to the broadcast equipment so that the destination exchange can broadcast the voice message. 6. The control method according to claim 5, wherein the exchanges are connected to a private line of E & M type. The control method according to claim 6, wherein the originating exchange detects a response signal transmitted from the destination exchange according to formation of a call between the dedicated line and the broadcast equipment, and visually informs the calling subscriber.