KR100351738B1 - Interfacing apparatus between a digital phone subscriber pc and a private branch exchange and private branch exchange having the apparatus - Google Patents

Abstract

The private switching device of the present invention comprises a private exchange for transmitting and receiving a digital line signal including a digital voice signal and a digital telephone control signal in a first predetermined connection method, and transmitting and receiving the digital telephone control signal in a second predetermined connection method. A computer, means for filtering the voice to generate an analog voice signal, means for reproducing the analog voice signal as voice, a match connected to a digital subscriber line of the private exchange, the computer, the generating means and the reproducing means. Means for transmitting the digital telephone control signal of the digital line signals received from the digital subscriber line in the first connection manner to the computer in the second connection manner; The reproducing means by converting into the analog voice signal Converting the analog voice signal received from the generating means into the digital voice signal and then formatting the digital telephone control signal and the digital voice signal received from the computer by the second connection method into the digital line signal. To the digital subscriber line.

Description

A matching device for a digital telephone subscriber's computer and a private exchange period, and a private switching device having the same.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private switching device, and more particularly, to a matching device for connecting a digital telephone subscriber's PC to a digital subscriber line of a private switching device for providing a private switching service to a digital telephone subscriber, and a private switching device having the same.

In general, a private exchange device is a device that provides subscribers with basic functions and various private exchange services that enable telephone subscribers within a certain area such as a company or school to communicate only through a private exchange without using a telephone company. For example, a private switching device provides a function for enabling a telephone call between subscribers using only an extension number shorter than the original telephone number.

On the other hand, the use of private switching devices including private exchanges with digital subscriber lines capable of providing good quality calls and various digital private exchange services is increasing compared to analog private switching services. The subscriber may be provided with a digital private exchange service by connecting a digital telephone such as a key phone to the digital subscriber line.

In addition, digital phone subscribers increasingly use their PCs to perform work. However, in the conventional private switching device, such a subscriber cannot use his own PC to receive the digital private switching service, and only uses a digital telephone. This is because the connection method of the digital subscriber line is not standardized unlike the connection method of the analog subscriber line, so that the subscriber PC cannot be connected to the digital subscriber line of the private switch.

Therefore, a digital telephone subscriber can be provided with a digital private exchange service by running a telephone function application installed on his PC, for example, wearing a headset equipped with a handset (earphone) and a handset (microphone) instead of the digital telephone. The need for matching devices has increased.

It is therefore an object of the present invention to provide a matching device and a private switching device having the digital telephone subscriber, so that the digital telephone subscriber can be provided with the digital private switching service by connecting to the digital subscriber line of the private switching center using his PC instead of the digital telephone. It is.

In the present invention to achieve the above object, in the private exchange device,

A private exchange which transmits / receives a digital line signal including a digital voice signal and a digital telephone control signal in a first predetermined connection method;

A computer for transmitting and receiving the digital telephone control signal in a second predetermined connection method;

Means for filtering the speech to generate an analog speech signal,

Means for reproducing the analog voice signal as voice;

A matching means connected to a digital subscriber line of said private exchange, said computer, said generating means and said reproducing means, wherein said matching means

The digital telephone control signal of the digital line signal received from the digital subscriber line in the first connection method is transmitted to the computer in the second connection method, and the digital voice signal is converted into the analog voice signal for reproduction. Means for converting the analog voice signal received from the generating means into the digital voice signal, and then receiving the digital telephone control signal and the digital voice signal received from the computer by the second connection method. It provides a private switching device for transmitting to the digital subscriber line by formatting.

1 is a block diagram showing a private exchange device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing details of the matching device of FIG. 1. FIG.

<Explanation of symbols for the main parts of the drawings>

2: private exchange

3: PC matching device

4: PC

5: headset

Hereinafter, a digital telephone subscriber using a matching device of the present invention will be described in detail with reference to the accompanying drawings in which a personal computer (PC) is connected to a digital subscriber line of a private exchange and receives a private exchange service.

1 is a block diagram showing a private switching device according to an embodiment of the present invention, which includes a digital telephone 1, a private switching device 2, a PC matching device 3, a PC 4, and a headset (head-set). (5).

The digital telephone 1 is a telephone such as a key-phone having a liquid crystal display and numeric and function buttons, which is used by a subscriber (not shown) to receive a digital private exchange service.

The private exchange (2) is a private exchange having a digital subscriber line to which the digital telephone (1) can be connected in an access method using a dedicated protocol and signaling standard. The private exchange (2) provides a subscriber with various digital telephone services including an extension exchange service. can do. For example, the private exchange 2 may be implemented as a Meridian 1 of Nortel Netwroks, and a digital line signal including a digital voice signal and a digital telephone control signal transmitted from a digital subscriber line. Is coded using BPRZ-AMI (Bipolar Return-to-Zero-Alternate Mark Inversion) method and the transmission rate is 512 Kbps.

The PC matching device 3 connects to the digital subscriber line of the private switch 2 and transmits and receives digital line signals. In addition, the PC matching device 3 is connected to the PC 4 to transmit and receive digital telephone control signals, and is connected to the headset 5 to transmit and receive analog voice signals. That is, the PC matching device 3 transmits the digital telephone control signal separated from the digital line signal to the digital telephone PC 4 and converts the separated digital voice signal into an analog voice signal and transmits it to the headset 5. On the contrary, the analog voice signal transmitted from the headset 5 is converted into a digital voice signal and formatted into a digital line signal together with the digital telephone control signal transmitted from the digital telephone PC 4. For example, the PC matching device 3 and the PC 4 are connected by an RS-232C system having a 57.6 Kbps data transmission rate.

The digital telephone subscriber's PC 4 is a PC capable of installing and executing a digital telephone application that provides a graphical user interface (GUI) to the digital telephone subscriber and performs the functions of the digital telephone. For example, a digital telephone subscriber may install a digital telephone application, run it, and then, when the digital telephone type is displayed on the monitor, click the button on the monitor, such as a button on the actual digital telephone, with a mouse to initiate a call. All digital phone functions are available. The PC 4 generates a digital telephone control signal in accordance with the clicked button and transmits it to the PC matching device 3 in the RS-232C manner. Or display the driving state of the digital telephone on the monitor in accordance with the digital telephone control signal transmitted from the PC matching device 3.

The headset 5 reproduces the analog voice signal from the PC matching device 3 as a voice and listens to the subscriber. The headset 5 filters the subscriber's voice as an analog voice signal and transmits it to the PC matching device 3. Instead of the headset 5, separate speakers and microphones may be used.

In Fig. 1, only one digital phone 1, one PC 2 and one headset 5 are shown by way of example, but the private switch 2 has a plurality of digital subscriber lines so that a plurality of digital telephones can be connected. A plurality of matching devices may be provided for connecting a plurality of telephone PCs and headsets to the digital subscriber line of the private switch 2.

2 is a block diagram showing in detail the PC matching device 3 of the present invention. As described above, the digital matching line, the PC 4 and the headset 5 of the private switch 2 are connected to the PC matching device 3. For example, when the private exchange 2 is a Meridian 1 model, the private exchange 2 and the PC matching device 3 transmit and receive at a 512 Kbps transmission rate by coding a digital line signal using the BPRZ-AMI method. In addition, the PC 4 and the PC matching device 3 transmit and receive digital telephone control signals in an RS-232C method having a data rate of 57.2 Kbps. The headset 5 and the PC matching device 3 transmit and receive analog voice signals.

As shown in FIG. 2, the PC matching device 3 includes a digital subscriber line connection terminal 10, a digital subscriber line matching unit 20, a line signal separation / forming unit 30, a PC matching unit 40, PC connection terminal 50, voice signal conversion unit 60, headset connection terminal 70, central processing unit 80, display unit 90, clock generating unit 100, DC power supply unit 110, power conversion The unit 120 includes.

The digital subscriber line of the private switch 2 is connected to the digital subscriber line connection terminal 10.

The digital subscriber line matching unit 20 matches the impedance with the digital subscriber line of the private switch 2 connected to the digital subscriber line connection terminal 10.

The PC 4 of the digital telephone subscriber is connected to the PC connection terminal 50.

The PC matching unit 40 processes RS-232C matching with the digital telephone PC 4 connected to the PC connection terminal 50.

The headset 5 is connected to the headset connection terminal 70.

The line signal separation / forming unit 30 transmits the digital voice signal from the digital line signal received from the digital subscriber line matching unit 20 to the voice signal conversion unit 60 and the digital telephone control signal from the PC at a transmission rate of 57.2 Kbps. The matching unit 40 transmits. In addition, the line signal separating / forming unit 30 forms a digital line control signal received from the PC matching unit 40 and a digital voice signal received from the voice signal converting unit 60 into a digital line signal and transmits a 512 Kbps transmission rate. Reproduces and transmits the same to the digital subscriber line matching unit 20.

The voice signal conversion unit 60 digitizes the analog voice signal received from the headset 5 connected to the headset connection terminal 70 by a PCM (Pulse Coded Modulation) method, converts it into a digital voice signal, and then separates and forms a line signal. Transfer to section 30. In addition, the voice signal converter 60 converts the digital voice signal received from the line signal splitter / former 30 into an analog voice signal and transmits the analog voice signal to the headset 5 connected to the headset connection terminal 70. In addition, the voice signal converter 60 adjusts the level of the voice signal.

The central processor 80 is connected to the line signal separator / former 30, the voice signal converter 60, and the display 90. The central processing unit 80 separates the line signal so that the asynchronous transmission rate of the digital line signal transmitted to the private exchange 2 becomes 512 Kbps and the transmission rate of the digital telephone control signal transmitted from the digital telephone PC 4 becomes 57.2 Kbps. It controls the forming unit 30 and monitors the power supply state, the terminal connection state and the transmission and reception state. In addition, the central processing unit 80 controls the display of the display unit 90.

The display unit 90 displays a power input state, a terminal connection state, a transmission / reception state, and the like under the control of the central processing unit 80. For example, the display unit 90 includes a PWR lamp indicating a power input state and a SYS lamp indicating a normal operation of the central processing unit 80, and normal transmission / reception of signals with the digital subscriber line of the private exchange 2 is performed. And a TEL lamp indicating whether or not, a TxC lamp indicating a data transmission state with the PC 4, an RxC lamp indicating a data reception state, and the like.

The clock generator 100 generates a clock signal and supplies the clock signal to the line signal separator / former 30, the voice signal converter 60, the central processor 80, and the display 90.

The DC power supply unit 120 is connected to a commercial power source, for example, generates a 24V DC power source and applies it to the power converter 110.

The power conversion unit 110 converts the DC power applied from the DC power supply unit 120 into the required power such as DC + 5V, -5V, -12V, and the like in all other blocks included in the PC matching device 3. Supply to the block.

Alternatively, the PC matching device 3 may further include a digital telephone connection terminal (not shown) directly connected to the digital subscriber line connection terminal 10. In an alternative, the subscriber may further connect and use a digital telephone (not shown) to the PC matching device 3. Therefore, a digital telephone or telephone PC can be selected and occupy one digital subscriber line to provide private switching service.

1 and 2, an example in which a voice mail service (VMS), for example, a digital telephone subscriber is provided with a private exchange service using a digital telephone PC and a headset will be described below.

VMS is a service that corresponds to the telephone answering function of regular telephones. If the caller who calls the subscriber leaves the voice message at the private exchange when the subscriber is absent or unable to make a phone call, the subscriber can listen to the voice message later. It is a service.

First, the subscriber connects the communication terminal of the digital telephone PC 4 with the PC connection terminal of the PC matching device 3. Then, when the subscriber executes the digital telephone program on his PC 4, the form of a digital telephone equipped with a liquid crystal screen, numbers and function buttons may be provided on the monitor screen of the PC 4.

For example, the subscriber clicks the button of the digital telephone on the screen using a mouse or the like to apply the VMS for all incoming calls. The digital telephone PC generates a digital telephone control signal according to the clicked button and transmits it to the PC matching device 3 in the RS-232C method having a 57.2 Kbps transmission rate. The digital telephone control signal transmitted through the PC connection terminal 50 and the PC matching unit 40 of the PC matching device 3 is a digital line signal coded in the BPRZ-AMI method by the line signal separating / forming unit 30. It is formatted and transmitted via the digital subscriber line matching unit 20 and the digital subscriber line connection terminal 10 to the digital subscriber line of the private switch 2 at a 512 Kbps transmission rate.

Then, when the VMS is set up for the subscriber according to the digital control signal received at the private exchange 2, the caller who has called the subscriber is sent a message indicating that the VMS is applied and the voice message of the caller is transferred to the private exchange. Store in (2).

When the message is stored in the private switch 2, a digital line signal including a digital telephone control signal for informing that a message is generated is generated so that the digital subscriber line connection terminal 10 and the digital subscriber line matching unit of the PC matching device 3 ( The signal is transmitted to the line signal separation / forming unit 30 via 20). The line signal separating / forming section 30 transmits the digital telephone control signal of the digital line signal to the subscriber PC 4 via the PC matching section 40 and the PC connection terminal 50. The subscriber PC 4 displays, for example, the VMS button on the screen of the digital telephone on the screen in accordance with the received digital telephone control signal.

When the subscriber sees the blinking and clicks the MSG button on the screen to check the voice message, a digital telephone control signal for this is generated and transmitted to the private exchange 2 as described above. The private exchange 2 transmits the digital telephone control signal including the message sequence number and the incoming time, and the digital line signal including the stored digital voice signal to the line signal separation / forming unit 30 of the PC matching device 3. do. The line signal separator / former 30 transmits the digital telephone control signal from the digital line signal to the subscriber PC 4 and the digital voice signal to the voice signal converter 60. In the voice signal converter 60, the digital voice signal is converted into an analog voice signal and transmitted to the headset 5. The headset reproduces the received analog voice signal as voice, and the subscriber PC 4 displays the sequence number and incoming time of the voice message currently being reproduced on the digital telephone on the screen according to the received digital telephone control signal.

As such, the subscriber 4 is connected to the digital subscriber line of the private switchboard 2 using a dedicated protocol and signal standard via the PC matching device 3 according to the present invention without using the digital telephone 1. ) And a headset 5 to provide various digital phone services.

Therefore, according to the present invention, the digital telephone subscriber connects to the private branch exchange 2 through the PC matching device 3 and executes a program for performing the digital telephone function installed in the digital telephone subscriber's own PC 4, thereby executing the digital private subscriber. Exchange service can be provided.

Although the invention has been particularly shown and described by the foregoing detailed description, it will be appreciated that various changes may be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims. It is self-evident.

Claims (9)

In the private exchange device, A private exchange which transmits / receives a digital line signal including a digital voice signal and a digital telephone control signal in a first predetermined connection method; A computer for transmitting and receiving the digital telephone control signal in a second predetermined connection method; Means for filtering the speech to generate an analog speech signal, Means for reproducing the analog voice signal as voice; A matching means connected to a digital subscriber line of said private exchange, said computer, said generating means and said reproducing means, wherein said matching means The digital telephone control signal of the digital line signal received from the digital subscriber line in the first connection method is transmitted to the computer in the second connection method, and the digital voice signal is converted into the analog voice signal for reproduction. Means for converting the analog voice signal received from the generating means into the digital voice signal, and then receiving the digital telephone control signal and the digital voice signal received from the computer by the second connection method. To transmit to the digital subscriber line Private exchange device. The method of claim 1, wherein the matching means First connecting means connected to said digital subscriber line for transmitting and receiving said digital line signal in said first connection scheme; Second connecting means connected to the computer for transmitting and receiving the digital telephone control signal by the second connection method; Third connecting means for receiving the analog audio signal from the generating means; Fourth connecting means for transmitting said analog audio signal to said reproducing means; Line signal separation means for receiving the digital line signal from the first connection means and separating the digital telephone control signal and transmitting it to the second connection means; A conversion for converting the digital voice signal received from the line signal separating means into the analog voice signal and transmitting to the fourth connection means, and converting the analog voice signal received from the third connection means into the digital voice signal. Sudan, Line signal forming means for reproducing the digital telephone control signal from the second connecting means and the digital voice signal from the converting means into the digital line signal and transmitting it to the first connecting means. Private exchange device comprising a. The method of claim 2, wherein the first access method uses a digital subscriber line-dedicated protocol that depends on a private switch and codes the digital line signal using a Bipolar Return-To-Zero-Alternate Mark Inversion (BPRZ-AMI) method to 512. A private switching device that transmits at Kbps. The private switching device of claim 2, wherein the second access scheme is a data rate RS-232C scheme of 57.2 Kbps. The method of claim 2, Central processing means for controlling transmission speeds of the digital line signal and the digital telephone control signal, and monitoring a power-on state, a connection state of the first to fourth connection means, and a transmission / reception state; And display means for displaying a status monitoring result received from said central processing means. A matching device for receiving a digital private exchange service from a private exchange using a computer, a speaker, and a microphone, First connection means connected to a digital subscriber line of a private exchange and transmitting and receiving a digital line signal in a first connection manner; Second connecting means connected to said computer for transmitting and receiving a digital telephone control signal of said digital line signal in a second connection scheme; Third connecting means for receiving an analog audio signal from the microphone; Fourth connecting means for transmitting the analog audio signal to the speaker; Line signal separation means for receiving the digital line signal from the first connection means, separating the digital telephone control signal and the digital voice signal, and then transmitting the digital telephone control signal to the second connection means; Receiving the digital voice signal from the line signal separating means, converting the digital voice signal into the analog voice signal, transmitting the same to the fourth connection means, and converting the analog voice signal received from the third connection means into the digital voice signal. Conversion means, Receiving the digital telephone control signal from the second connecting means, receiving the digital voice signal from the converting means, reproducing the digital line signal including the digital telephone control signal and the digital voice signal, and the first connecting means. Means for forming line signals to transmit to Matching device comprising a. 7. The method of claim 6, wherein the first access method uses a digital subscriber line dedicated protocol that depends on a private exchange and codes the digital line signal in a Bipolar Return-To-Zero-Alternate Mark Inversion (BPRZ-AMI) scheme. Matching device that transmits at 512 Kbps. The matching device of claim 6, wherein the second access method is a data rate RS-232C method of 57.2 Kbps. The method of claim 6, Central processing means for controlling transmission speeds of the digital line signal and the digital telephone control signal, and monitoring a power-on state, a connection state of the first to fourth connection means, and a transmission / reception state; And display means for displaying a status monitoring result received from said central processing means.