KR100351737B1 - Pravite branch exchange apparatus for extending a digital subscriber line by using 2 wire line and apparatus therefor - Google Patents

Abstract

The present invention provides a private switching device for providing a digital private switching service to a remote digital telephone subscriber, comprising: a digital telephone used by the remote digital telephone subscriber and a digital subscriber line for transmitting and receiving a digital line signal for the digital private switching service. And a first matching means connected to said digital subscriber line for transmitting and receiving said digital line signal and performing conversion between said digital line signal and framed data having a predetermined structure; Second matching means connected to transmit and receive the digital line signal, to perform conversion between the digital line signal and the framed data, and to be connected by a two-wire solid line to transmit and receive the first matching means and the framed data. Private exchange chapter containing It provides.

Description

A private switching device and a matching device for extending a digital subscriber line by using a 2-wire solid line

The present invention relates to a private switching device, and more particularly, to a private switching device and a matching device therefor capable of extending a digital subscriber line between a private exchange and a digital telephone subscriber using a two-wire solid line.

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

On the other hand, digital phones, which can provide better quality calls and various services than analog phones, are increasingly being used. Between the digital subscriber lines and the digital phones of such private exchanges, for example, Time Compression Multiplexing) is used to connect at high speed. The TCM method is not only limited to a distance of approximately 1 km within the distance between the private exchange and the digital telephone, but also the connection between the private exchange and the digital telephone is not standardized. Remote digital telephone subscribers were not provided private exchange services.

To this end, in the Korean Patent Application No. 10-2000-13509, filed March 17, 2000 by the same applicant, a private switching device capable of connecting a remotely located digital telephone to a private exchange using a data line of a public network; A matching device is disclosed, which has a disadvantage in that a remote subscriber must occupy a dedicated line of a data transmission network in order to receive a private switching service.

It is therefore an object of the present invention to provide a private switching device and a matching device for a private switching device capable of extending a digital subscriber line of a private switching device using a two-wire solid line so as to provide a private switching service to a remote digital telephone subscriber. will be.

In order to achieve the above object, the present invention provides a private exchange device for providing a digital private exchange service to a remote digital telephone subscriber,

A digital telephone used by the remote digital telephone subscriber;

A private exchange having a digital subscriber line for transmitting and receiving digital line signals for the digital private exchange service;

First matching means connected to said digital subscriber line for transmitting and receiving said digital line signal and performing conversion between said digital line signal and framed data having a predetermined structure;

Connected to the digital telephone to transmit and receive the digital line signal, to perform conversion between the digital line signal and the framed data, and to connect the first matching means and the framed data in a two-wire solid line. It provides a private exchange device including a second matching means.

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

2 is a block diagram illustrating one embodiment of a matching device in accordance with the present invention.

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

1: remote digital phone

2: private exchange

3, 4: exchange side and remote subscriber side matching device

5: exchange side digital telephone

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 switch-side matching device 3, a remote subscriber-side matching device 4, Remote digital telephone 5.

The digital telephone 1 and the remote digital telephone 5 are telephones, such as a key-phone with a liquid crystal display and numeric and function buttons, which subscribers (not shown) use to receive digital private exchange services. It is a telephone.

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) scheme and the transmission rate is 512 Kbps.

The exchange side matching device 3 connects to the digital subscriber line of the private exchange 2 and transmits and receives digital line signals.

The remote subscriber side matching device 4 is connected to the remote digital telephone 5 to transmit and receive digital line signals, and is connected to the switch-side matching device 3 in a 2-wire solid line and transmits and receives data framed by RS-485. do. For example, framed data includes an 8 Kbps digital telephone control signal, a 24 Kbps compressed digital voice signal, an 8 Kbps frame signal, and is transmitted and received at a 40 Kbps transmission rate.

In Fig. 1, only one digital telephone 1 and one remote digital telephone 5 are shown by way of example, but the private switchboard 2 is provided with a plurality of digital subscriber lines so that a plurality of digital telephones can be connected, Multiple remote digital telephones can be connected using multiple matching devices.

Fig. 2 is a block diagram showing in detail the switching side and remote subscriber side matching devices 3, 4 of the present invention. For example, when the private switch 2 is a Meridian 1 model, the BPRZ- is between the private switch 2 and the switch-side matching device 3 and between the remote subscriber-side matching device 4 and the remote digital telephone 5. Digital line signal is coded by AMI method and transmitted and received at 512 Kbps transmission rate. In addition, the switch-side matching device 3 and the remote subscriber-side matching device 4 are connected by a two-wire solid line, and transmit and receive signals by RS-485.

As shown in Fig. 2, the matching devices 3 and 4 include a partner matching device connecting terminal 11, an RS-485 driver 12, a frame forming and line signal reproducing unit 13, and a digital subscriber line matching unit ( 14, digital subscriber line connection terminal 15, audio signal compression / decompression unit 16, central processing unit 17, display unit 18, clock generating unit 19, DC power supply unit 20, power supply It includes a conversion unit 21.

The two mating wires connected to the mating mating devices 3 and 4 are connected to the mating mating device connecting terminal 11.

The RS-485 driver 12 drives the two-wire solid wire connected to the connection terminal 11 in the RS-485 manner.

The digital subscriber line or remote digital telephone 5 of the private switch 2 is connected to the digital subscriber line connection terminal 15.

The digital subscriber line matching section 14 matches the impedance with the digital subscriber line of the private switch 2 connected to the digital subscriber line connection terminal 15.

The frame forming and line signal reproducing unit 13 separates the digital telephone control signal and the digital voice signal from the digital line signal received from the digital subscriber line matching unit 14 so that the digital voice signal is converted into the voice signal compression / decompression unit 16. After receiving the compressed digital voice signal from the voice signal compression / decompression unit 16 and forming the framed data including the digital telephone control signal and the compressed digital voice signal, RS reproduces the 40 Kbps transmission rate. -485 to the driver 12.

In addition, the frame forming and line signal reproducing unit 13 separates the digital telephone control signal and the compressed digital voice signal from the framed data received from the RS-485 driver 12 to convert the compressed digital voice signal into the voice signal compression / reverse. After transmitting to the compression unit 16 and receiving a digital voice signal from the voice signal compression / decompression unit 16, it forms a digital line signal including a digital telephone call control signal and a digital voice signal and reproduces a 512 Kbps transmission rate. To the digital subscriber line matching unit 20.

The central processing unit 17 is connected to the frame forming and line signal reproducing unit 13, the audio signal compression / decompression unit 16, and the display unit 18. The central processing unit 17 controls the asynchronous transmission speed of the digital line signal transmitted to the private exchange 2, monitors the power-on state, the terminal connection state, the transmission / reception state, and the like, and controls the display of the display unit 18.

The display unit 18 displays a power input state, a terminal connection state, a transmission / reception state, and the like. For example, the display unit 18 includes a PWR lamp indicating a power input state, a SYS lamp indicating a normal operation of the central processing unit 17, two TEL lamps indicating a terminal connection, and a data transmission state. It may include a TxD lamp for displaying, an RxD lamp for displaying a data reception state, and the like.

The DC power supply unit 20 is connected to a commercial power source, and generates, for example, 24V DC power to the power converter 21.

The power converter 21 converts the DC power applied from the DC power supply 20 into power required for all other blocks included in the matching devices 3 and 4 and supplies the same to the corresponding block.

The clock generator 19 generates a clock signal and supplies the clock signal to the frame forming and line signal reproducing unit 13, the audio signal compression / decompression unit 16, the central processing unit 17, and the display unit 18.

Therefore, when the matching device 3, 4 of the present invention is used between the private switch 2 and the remote digital telephone 5, the length of the digital subscriber line can be extended by using two wires. Digital telephone subscribers within a radius of approximately 4.5 km from can be provided with a digital private exchange service.

The private switching device of the present invention can provide a digital private switching service to a remote digital telephone subscriber by implementing a digital subscriber line of a private exchange connecting with a digital telephone using a 2-wire solid line using a dedicated protocol and a signal standard. have.

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 (11)

A private switching device for providing a digital private exchange service to a remote digital telephone subscriber, A digital telephone used by the remote digital telephone subscriber; A private exchange having a digital subscriber line for transmitting and receiving digital line signals for the digital private exchange service; First matching means connected to said digital subscriber line for transmitting and receiving said digital line signal and performing conversion between said digital line signal and framed data having a predetermined structure; Connected to the digital telephone to transmit and receive the digital line signal, to perform conversion between the digital line signal and the framed data, and to connect the first matching means and the framed data in a two-wire solid line. A second matching means Private exchange device. The method of claim 1 wherein each of the first and second matching means First connection means connected to one of the digital subscriber line of the private exchange and the remote digital telephone to transmit and receive the digital line signal; The second connecting means connected to one of the first matching means and the second matching means in a two-wire solid line to transmit and receive the framed data; After receiving the digital line signal from the first connection means, the digital voice signal and the digital telephone control signal included in the digital line signal are separated, and the digital voice signal is converted into a compressed digital voice signal and then the digital control signal and Frame forming means for generating the framed data including the compressed digital voice signal and transmitting it to the second connection means; After receiving the framed data from the second connection means, the digital telephone control signal and the compressed digital voice signal are separated, and the compressed digital voice signal is converted into the digital voice signal, and then the digital telephone control signal and the Line signal reproducing means for forming and transmitting the digital line signal including the compressed digital voice signal to the first connection means Private exchange device comprising a. 3. The digital line signal according to claim 2, wherein the digital line signal is coded in a Bipolar Return-To-Zero-Alternate Mark Inversion (BPRZ-AMI) scheme and 512 between the digital subscriber line of the private exchange or between the digital telephone and the first access means. Private switching device that transmits and receives at Kbps. 3. The private exchange device of claim 2, wherein the second access means transmits and receives the framed data in a 40 Kbps transmission rate RS-485 scheme. 3. The private exchange apparatus of claim 2, wherein the framed data comprises an 8 Kbps digital telephone control signal, a 24 Kbps compressed digital voice signal, and an 8 Kbps frame signal. 3. The apparatus of claim 2, further comprising: central processing means for controlling a transmission rate of the digital line signal and the framed data, and monitoring a power-on state, a connection state of the first and second connection means, and a transmission and reception state; And display means for displaying a status monitoring result received from said central processing means. A matching device for a private switching system for connecting a digital telephone of a remote digital subscriber to a digital subscriber line of a private exchange in order to provide a digital private switching service to a remote digital telephone subscriber. First connection means connected to one of said digital subscriber line and said remote digital telephone for transmitting and receiving digital line signals; The second connecting means connected to a matching device for another private exchange system in a two-wire solid line to transmit and receive framed data; After receiving the digital line signal from the first connection means, the digital voice signal and the digital telephone control signal included in the digital line signal are separated, and the digital voice signal is converted into a compressed digital voice signal and then the digital control signal and Frame forming means for generating the framed data including the compressed digital voice signal and transmitting it to the second connection means; After receiving the framed data from the second connection means, the digital telephone control signal and the compressed digital voice signal are separated, and the compressed digital voice signal is converted into the digital voice signal, and then the digital telephone control signal and the Line signal reproducing means for forming and transmitting the digital line signal including the compressed digital voice signal to the first connection means Matching device for a private exchange system comprising a. 8. The private switched system of claim 7, wherein the digital line signal is coded in a BPRZ-AMI scheme and is transmitted and received at a 512 Kbps transmission rate between a digital subscriber line of the private exchange and a selected one of the remote digital telephones and the first access means. Matching device for. 8. The matching device according to claim 7, wherein the second connection means transmits and receives the framed data in an RS-485 manner. The method of claim 7, wherein Central processing means for controlling a transmission rate of the digital line signal and the framed data, and monitoring a power supply state, a connection state of the first and second connection means, and a transmission and reception state; And display means for displaying a status monitoring result received from said central processing means. 8. The matching device of claim 7, wherein the framed data comprises an 8 Kbps digital telephone control signal, a 24 Kbps compressed digital voice signal, and an 8 Kbps frame signal.