KR0174567B1 - Line Multiple Access Device of Total Remote Service System - Google Patents

Abstract

The present invention relates to a line multiple access device for a comprehensive remote service system, and more particularly, to a line multiple access device for interfacing to perform remote information processing without affecting a call by scanning a state of a subscriber.

Existing comprehensive remote service system uses private line, so if the number of subscribers is increased, it is necessary to increase leased line. However, since expansion of dedicated line has limitations, general public line network is used to limit additional installations due to the increase of subscribers. By performing various remote services, and interfacing to handle various remote services without affecting the general public line network by scanning the usage status and abnormality of the subscriber line, it is not limited by the line expansion due to the increase of subscribers, Perform prompt service.

Description

Line Multiple Access Device of Total Remote Service System

1 is a circuit diagram of a line multiple connection apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

10: micro controller 20: coupler communication unit

30: ring detection unit 40: line state detection unit

The present invention relates to a line multiple access device for a comprehensive remote service system, and more particularly, to a line multiple access device for interfacing to perform remote information processing without affecting a call by scanning the state of the subscriber.

In general, the comprehensive remote service system is an MDF access method using the MDF (MAIN DISTRIBUTOR FRAME) of the exchange, and does not affect the exchange or subscriber call, and performs various services using the telephone line. The various types of services include remote meter reading for various meters in the home, security service for connecting a sensor to a terminal (HSU) in a subscriber's house and reporting crime prevention, disaster prevention, gas leakage, remote control data service, etc. There is this.

However, the conventional comprehensive remote service system performs a service using a dedicated line, or measures a line voltage in the case of a joint line network, and when it is below the set voltage, judges that it is in a call and does not transmit data to the telephone line. Only when the data was transmitted to the telephone line to perform various services. The conventional comprehensive remote service system as described above is unable to perform services by performing services using a dedicated line or transmitting data when a general subscriber is busy, and also uses a dedicated line, thereby increasing costs. In order to increase the number of lines, the number of leased lines should be increased.

In order to solve such a problem, various services can be performed by using a general public network without using a dedicated circuit, but it should not affect the call of the public public network. In order not to affect the general public line network, in the idle state, after scanning the terminal (HSU) in the home, the alarm state is monitored and if an alarm condition occurs, it is notified to the line connection controller to process various services There was a need for a line multiple access device.

Accordingly, an object of the present invention is to provide a line multiple access device for interfacing to perform remote information processing by scanning the state of the subscriber side using a general public line network.

The present invention for achieving the above object is connected to the subscriber line, the subscriber line detecting means for detecting the presence and disconnection status of the subscriber, and selecting the subscriber line upon receiving a predetermined work command message for the line multiple access Outputs a control signal for the line, outputs a telephone line enable signal and a low frequency enable signal, and transmits the reception message when the state detection signal of the line is not received from the subscriber line detection means, and responds to the reception message. Control means for receiving and processing a response signal, and connected between the subscriber line and the control means, outputting a message output from the control means to the selected subscriber line, and outputting a processing result message received from the subscriber line. Characterized in that it comprises a communication path forming means for output to the control means The.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a circuit diagram of a line multiple access device according to the present invention. The microcontroller 10 outputs a control signal for selecting a subscriber line for line multiple connection when receiving a message at a predetermined work command, and enables a telephone line. A signal and a low frequency enable signal are output, and when the state detection signal of the line is not received, the signal is sent, and a response signal corresponding to the received message is received and processed. The first-second relays K1-K2 form a loop of telephone lines by the telephone line enable signal output from the microcontroller 10. The resistor is connected to the tip (T) and ring (R) terminals, respectively, to block the loop when not scanning the subscriber.

The rectifier BD1 has a loop formed by the first-second relays K1 and K2 to rectify and output the signal input through the tip T and ring R terminals. The ring detector 30 detects a ring signal from the signal rectified and output from the rectifier BD1 and outputs the ring signal to the microcontroller 10. Coupler communication unit 20 is connected to the micro-controller 10 and outputs a modulated demodulation for communication with the coupler if necessary. The transformer T1 impedance-matches a signal input through the tip T and the ring R terminal or a signal output from the coupler communication unit 20 and outputs the impedance matching. The line state detecting unit 40 is connected to the microcontroller 10 to detect a disconnection state of a line and output the detected line to the microcontroller 10.

A preferred embodiment of the present invention will be described in detail with reference to FIG.

First, the line multiple access device is connected between an LCS (LINE CONCENTRATION SYSTEM) and an LCA (LINE CONCENTRATION) adapter, and communicates with the LCS and controls the LCA to call a terminal (HSU) in the home to perform meter reading. Do this.

Therefore, when the line multiple access device does not perform various tasks such as meter reading, medical treatment, or control, the microcontroller 10 performs a scanning operation. The telephone line enable signal Tel EN is transmitted from the microcontroller 10. When is applied to the first relay (K1), the first-first relay (K1-K2) is turned on is connected to the subscriber line.

However, when the first-second relays K1-K2 are off, the resistors R1 and R2 become resistance values of 2 MΩ and thus are not connected to the subscriber line. When a ring signal is input to the tip T and ring R terminals while the first to second relays K1 to K2 are turned on and connected to the subscriber line, the first and second relays K1 to K2 are rectified and output through the rectifying unit BD1. The ring signal rectified and output from the rectifying unit BD1 drives the photocoupler PC1 through the capacitor C3, the resistor R4, and the zener diode ZD1. At this time, the photo coupler PC1 detects a ring signal and applies it to the microcontroller 10. The microcontroller 10 cuts off a connection state with a subscriber line by blocking a telephone line enable signal Tel EN. . When the first to second relays K1 and K2 are turned on and connected to the subscriber line, the microcontroller 10 generates a low frequency enable signal LF EN to detect a line state. When the frequency enable signal LF EN is applied to the third relay K3, the third relay K3 is turned on. When the third relay K3 is turned on, the photocoupler PC2 outputs a signal LCAF for determining a line state of a subscriber connected through the rectifying unit BD1 according to the driving state of the photodiode. Apply to the controller (10).

At this time, the photocoupler PC1 outputs a high signal when the subscriber line is disconnected, and outputs a low signal when the subscriber line is not disconnected, and applies the low signal to the microcontroller 10. Accordingly, when the line state determination signal LCAF of the photocoupler PC2 is low, the microcontroller 10 determines that there is no abnormality in the subscriber line, and when it is high, the micro controller 10 determines that the subscriber line is disconnected. -Turn off the second relay (K1, K2) to cut off the connection to the subscriber line.

On the other hand, if the ring signal is not detected from the photocoupler PC1 or the disconnection state of the subscriber line is not detected from the photocoupler PC2, the microcontroller 10 may perform the first to second relays K1 and K2. ) Is turned on and connected to the subscriber line, and transmits data for performing various services such as meter reading, medical treatment or control to the coupler (not shown) through the coupler communication unit 20 and the transformer T1. Then, the coupler analyzes it and exchanges an abnormal state or various service information through the coupler communication unit 20 through modem communication.

As described above, various remote services are performed by using the general public line network, and by interfacing to process various remote services without affecting the general public line network by scanning the usage status and abnormality of the subscriber line, It is not limited by the line expansion, and there is an advantage that can perform a quick service.

Claims (3)

A line multiple access device of a comprehensive remote service system, comprising: a subscriber line detecting means connected to a subscriber line to detect the presence or absence of a call and a line disconnection state of the subscriber, and a subscriber line upon receiving a predetermined work command message for the line multiple connection. Outputs a control signal for selection, outputs a telephone line enable signal and a low frequency enable signal, and transmits the received message when the state detection signal of the line is not received from the subscriber line detecting means, and the received message Control means for receiving and processing a response signal corresponding to the controller; and connected between the subscriber line and the control means, outputting a message output from the control means by the control signal of the control means to the selected subscriber line; The control means sends a processing result message received from a subscriber line. Apparatus characterized in that it consists of the output signal means that the communication path is formed. The communication path forming means according to claim 1, further comprising: a first to second relay for forming a loop of a telephone line by a telephone line enable signal output from the control means, and a coupler if necessary connected to the control means; And a coupler communication unit for modulating and outputting a message output from the control means to the selected subscriber line for communication with the selected subscriber line, and demodulating and outputting a processing result message received from the subscriber line. The rectifier of claim 1 or 2, wherein the subscriber line detecting means is connected to the subscriber line by the first-second relay and rectifies and outputs a signal input through the tip (T) and ring (R) terminals. And a ring detection unit for detecting a ring signal from the signal rectified by the rectifying unit and outputting the ring signal to the control unit, and a line state detection unit connected to the control unit to detect a disconnection state of the line and output the detected line to the control unit. Device characterized in that.