KR100232875B1 - Line multi-access apparatus - Google Patents

Abstract

The proposed system for collecting and processing various types of information generated in the subscriber's home via a line such as a telephone network or an interphone network existing as an existing voice communication network includes the subscriber's handset 205 and the existing communication network 200. A multiplexing means mechanically coupled to the distributor 201 used for the line connection between the user and the user in the subscriber premises connected in parallel with the handset 205 to the line 206. Coupling means for coupling terminals 212, Controlling the multiplexing means in response to an applied work command and accessing the line to perform the communication necessary for the collection and processing of the coupling means and the information The line multiple connecting means and the line multiple connecting means applying the work command and scanning the line by the line multiple connecting means. To the acquisition and processing characterized by having a host processing unit for service to the service path. According to the present invention described above, various additional services are improved and user convenience is improved.

Description

Line Multiple Access Device

1 is a conventional system configuration diagram.

2 is a system configuration diagram of the present invention.

3 is a block diagram of a line multiple access device of the present invention.

4 is a coupler configuration diagram of the present invention.

5 is a configuration diagram of a coupler communication unit of the present invention.

6 is a configuration diagram of a coupler communication unit of the present invention.

In the present invention, a remote information processing system using an existing line is connected to an existing distributor (Main Distribution Frame: MDF: Main Distribution Frame; Intermediate Distribution Frame: IDF: Inter-mediate Distribution Frame) to control a multiplexer for multiple access to subscriber lines. The failure status and security occurrence status of the subscriber's premises equipment (hereafter coupler) connected in parallel with various work information processing (remote reading, remote medical, remote traffic, remote control, ...) and subscriber line Gas leaks, thefts, crime prevention, ...) can be periodically scanned and the resulting information will be notified to the upper level so that each public utility company (safety management company, police station, fire department, gas safety management company, ...) can act quickly. The present invention relates to a track multiple access device.

1 is a conventional system configuration diagram (US Pat. No. 4,442,320), which includes an existing telephone line network 10, subscriber telephones 11, 12, 13, subscriber telephone lines 14, 15, 16, and a local exchange. Scanner 18 placed in a position to easily connect 17 and subscriber lines 14, 15 and 16 and scanner 18 in a position to easily connect said scanner 18 and subscriber lines 14, 15 and 16. Subscriber terminal unit connected in parallel to the line (19, 20, 21) and the subscriber line (14, 15, 16) indicating the connection between the 18 and the scanner 18 and the subscriber line (14, 15, 16) Existing time 1 to select a different connection at different times of the system overall configuration consisting of (22, 23, 24) and the lines 19, 20, 21 connected to the scanner 18 as the inside of the scanner 18. With the secondary, secondary and tertiary multiplexers 25, 26 and 27, the multiplexer 5 is bidirectionally connected to the transmit / receive switch 28 (hereinafter referred to as the tip and ring switch) and differ from each other at different times. The circuit connections 19, 20, and 21 are selectively connected, and the tip and ring switch 28 receives the FSK modem signals received from the multiplexer 25 to the modulator 29 and the FSK modem signals from the modulator 30. The multiplexers 26 and 27 transmit their respective output signals to different filters 32 and 33.

The filter 32 provides the subscriber's hookoff signal to the hookoff detector 34 and the filter 33 provides the low tone signal to the low tone detector 35 and the output signals of these detectors 34 and 35 are provided in the system. An internal configuration diagram of the scanner 18 having a structure supplied to the controller 31 is connected in parallel to the subscriber line 14 to transmit a signal from the subscriber line 14 to the filter 36 and the filter 36 is an FSK. Provides an output signal for the modem signal to the demodulator 37 and delivers the FSK modem signal from the modulator 38 to the subscriber line 14 and also transmits the low tone generated by the low tone generator 39. The output signal from 37 is received by the signal processor 40 and the FSK modem signal of the modulator 38 and the low tone of the low tone generator 39 are directed to the subscriber terminal unit 22 controlled by the signal processor 40. Signal sources 41, 42, and 43 are connected to the subscriber terminal unit 22. It detects the alarm state of the fire generates a relay operation.

The operation of the conventional system having the above configuration will be described below.

The low tone generator 39 of each subscriber terminal unit 22 is configured to generate a frequency below the audible frequency range so that the signal sources 41, 42, 43 of the subscriber terminal unit 22 are not in an alarm state. In the scanner 18, the low tone generator 39 is controlled by the signal processor 40 to transmit low tones to the line 19 connected to the subscriber line 14 and the scanner 18. When the signal sources 41, 42, and 43 are in an alarming state, the low tone generator 39 is controlled by the signal processor 940 to connect the subscriber line 14 to the scanner 18. The low-tone generator 39 is controlled so that the low-tone is not transmitted to the line 19 connected to the subscriber line 14 and the scanner 18 so that the scanner 18 can detect that an alarm has occurred. Between the scanner 18 and the subscriber terminal unit 22 The four books that can occur if, for example, will be described.

First, when the subscriber telephone is in the on-hook state and no alarm occurs, the scanner 18 controls the multiplexer 26 to detect the on-hook state of the subscriber line 19 through the filter 32 and the subscriber terminal unit ( 22) by controlling the multiplexer 25 to periodically transmit the FSK modem signal through the modulator 30 and the subscriber terminal unit 22 transmits the FSK modem signal through the modulator 38 when no alarm occurs. The modulator 29 of the scanner 18 detects the FSK modem signal, indicating that no alarm has occurred in the system controller 31.

Second, when the subscriber telephone is in the on-hook state and an alarm occurs, the scanner 18 controls the multiplexer 26 to detect the on-hook state of the subscriber line 19 through the filter 32 and the subscriber terminal unit 22. The multiplexer 25 is controlled to periodically transmit the FSK modem signal through the modulator 930 and the modulator 29 of the scanner 18 transmits the FSK modem signal through the modulator 38. The demodulator 29 detects the FSK modem signal, indicating that an alarm has occurred in the system controller 31.

Third, when the subscriber telephone is in the off-hook state and no alarm occurs, the scanner 18 controls the multiplexer 26 to detect the off-hook state of the subscriber line 19 through the filter 32 and the subscriber terminal unit ( 22) by detecting the low tone from the subscriber terminal unit 22 by controlling the multiplexer 27 without transmitting the FSK modem signal through the modulator 30. The subscriber terminal unit 22 detects that the alarm does not occur. When the signal processor 40 controls the low tone generator 39 and transmits the low tone, the low tone detector 35 detects the low tone through the filter 33 of the scanner 18 and the system controller 31 detects the low tone. It can be seen that no alarm has occurred.

Fourth, when the subscriber telephone is in the off-hook state and an alarm occurs, the scanner 18 controls the multiplexer 26 to detect the off-hook state of the subscriber line 19 through the filter 32 and the subscriber terminal unit 22. Instead of transmitting the FSK modem signal through the modulator 30, the low-tone from the subscriber terminal unit 22 is controlled by the multiplexer 27, and the subscriber terminal unit 22 detects that the alarm has occurred. Since the low tone generator 35 does not detect the low tone, the system controller 31 determines that an alarm has occurred, and the subscriber terminal unit 22 controls the multiplexer 25 to modulate the FSK modem signal. And the subscriber terminal unit 22 transmits the alarm generation state through the modulator 38, the modulator 29 of the scanner 18 detects the FSK modem signal. In the system controller 31 will know that an alarm has occurred.

As can be seen from the above, when the subscriber telephone is on hook and no alarm has occurred or has not occurred, it is obtained through FSK modem communication between the scanner 18 and the subscriber terminal unit 22, and the subscriber telephone is off hook and alarm occurs. If not, the scanner 18 detects the non-audible frequency (low tone: 25 Hz) transmitted from the subscriber terminal unit 22 and recognizes that it is normal. If an alarm occurs, the subscriber terminal unit ( After detecting that there is no low tone from 22), alarm information of the subscriber terminal unit 22 is obtained through FSK modem communication between the scanner 18 and the subscriber terminal unit 922.

However, when the telephone is off-hook and an alarm occurs, alarm information is obtained through FSK modem communication between the scanner 18 and the subscriber terminal unit 22. If the telephone is off-hook and an alarm occurs, there is a disadvantage that the scanning time of the scanner 18 takes a lot.

However, when the telephone is off-hook and an alarm occurs, alarm information is obtained through the FSK modem communication between the scanner 18 and the subscriber terminal unit 922, and thus, the subscriber may affect the existing call when the user is busy. When the telephone is in the on-hook state, when an alarm occurs or does not occur, and when the telephone is in the off-hook state and an alarm occurs, the scanning time of the scanner 18 also takes a long time.

As can be seen in the system configuration of FIG. 1, the connection between the scanner 18 and the subscriber lines 14, 15, and 16 in order for the scanner 18 to periodically scan the status of the subscriber terminal units 22, 23 and 24. If the in-line (19, 20, 21) accommodates a large number of subscribers, many line connections are required, so installation is very difficult and may cause a price increase, as well as management of the existing telephone line (14, 15, 16) The management of the connecting lines 19, 20 and 21 is also required, which leads to a lot of difficulties in terms of operation. The time primary for selecting different connections of the connecting lines 9, 20 and 21 at different times in the scanner 18. , Secondary and tertiary multiplexers (25, 26, 27) are built in, so if multiple subscribers are accommodated, the multiplexing ratio is closely related to the efficiency of the scanner (18). Built-in will cause a price increase and multiplexer (25, If the current structure does not include a plurality of 26, 27, the multiplexing ratio will be high, and the efficiency of the scanner 18 will be reduced.

Accordingly, an object of the present invention is to control a multiplexer connected to an existing main distribution plate (MDF) and an intermediate distribution plate (IDF) (hereinafter referred to as a divider) in a remote information processing system using an existing line to access multiple subscriber lines. Fault occurrence status and security occurrence status (fire, gas leak, etc.) of subscriber premises equipment (hereafter coupler) connected in parallel to work information processing (remote reading, remote medical care, remote traffic, remote control, ...) and subscriber line Thefts, methods, ...) are periodically scanned and the resulting information is sent to the top so that each utility company (safety management company, police station, fire department, gas safety management company, ...) can act quickly, Regardless of whether the subscriber line (off-hook or off-hook) is connected in parallel with the subscriber line, the coupler's failure and alarm status can be changed without affecting the existing call. Because information is obtained through two-way communication between couplers, there is no need to check the use of subscriber line. Therefore, there is no step to check the use of subscriber line. The present invention provides a preferred multiple access device that enables the coupler to be scanned within time and does not check the state of the subscriber line, so that the circuit and its control are simple and efficient.

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

First, FIG. 2 is an overall system diagram of the present invention. The communication network 200 is a conventional voice communication network, which is used to connect a subscriber line to a subscriber's handset (telephone or interphone) 205 through a telephone network or an interphone network. A multiplexer 202 capable of inhibiting the track is mechanically coupled to the coupler 204, which is a subscriber short-term, in parallel with the handset 205 connected at the subscriber line 206.

In this case, the multiplexer 202 is mechanically coupled to the distributor 201, which is easy to install, and the system can be flexibly expanded according to the increase of subscribers. The coupler 204 has a user terminal 212 that is in charge of actual service. The user terminal may be an alarm terminal, a meter reading terminal, a medical examination terminal, a traffic terminal, etc. according to service rectification, and controls the multiplexer 202 coupled with the distributor 201 and suppresses the subscriber line 206. Transmits a work command to the line multiplexer 203 and the line multiplexer 203 in communication with the coupler 204 and thereby periodically scans the coupler 204 at the data and preferred multiplexer 203. It consists of a computer center 208 that collects a piece of information and a utility company 209 that processes and services data received from the computer center 208.

Operation will be described in detail with reference to FIG. 2 according to the above configuration.

When there is no request for data (for example, a meter reading value) of the user terminal 212 requested by the utility company 209, the line multiple access device 203 controls the multiplexer 202 to sequentially couple the coupler 204. ), The state of the coupler 204 and the user terminal 212, and the presence of the alarm terminal, the occurrence of the alarm and the type of the alarm does not interfere with the line user at all, regardless of the use of the line 206. If an abnormal condition occurs without noticing, the computer center 208 notifies the utility center 209 of this and executes the corresponding service.

Here, the computer center 208 may exist in the same building as the track multiple access device 203 or may exist remotely. Accordingly, in the line multiple access device 203, the means for communicating with the computer center 208 is for a general communication line, and may have a modulation and demodulation device for a long distance. When multiple data is requested, the line multiple access device 203 controls the multiplexer 202, performs bidirectional communication with the coupler 204 connecting the corresponding subscriber line, and couples the data of the user terminal 212 to the coupler 204. When received through the computer and transmitted to the computer center 208, the computer center 208 is a device that notifies the public utility company 209 to perform the service.

3 is a block diagram of the line multiple access device 330 and the multiplexer 300 and a multiplexer controller for controlling the operation of the relay 301 and the relay 301 connected to the subscriber line 311 on the side of the communication network 200 ( 302 and a multiplexer 300 comprising a control signal 312 of the relay 301 supplied from the control unit 302 and a control signal 312 of the relay 301 supplied from the control unit 302. The multiplexer 300 and the multiplexer control signal generator 303 for generating the control signal 314 and the multiplexer 300 control the relay 301 of the multiplexer 300 to connect the user side subscriber line 313. Coupler 204 for performing each task or scanning status information of the coupler 204 and the user terminal 212 according to a work request from the computer center 208, regardless of whether the subscriber line 313 is used or not. Coupler communication unit 310 for performing bidirectional communication with It is transmitted and received between the computer center communication unit 304 and the computer center communication unit 304 and the microcontroller 305 in charge of communication with the computer center 208 in the microcontroller 305 and the microcontroller 305 in charge of all control. And a communication line 316 between the signal line 317 and the computer center communication unit 304 and the computer center 208.

Referring to the detailed operation according to the above configuration, when there is no request for data (for example, a meter reading value) of the user terminal 212 requested by the utility company 209 of FIG. 2, the line multiple access device 330 The microcontroller 305 controls the multiplexer control signal generator 303 and transmits the multiplexer control signal 314 to the multiplexer control unit 302, and the multiplexer control unit 302 analyzes the signal and relays the corresponding relay 301. The relay 301 is operated to send a relay operation signal 312 so that the subscriber line 311 of the communication network 200 is electrically connected to the user side line 313 and the microcontroller 305 is a coupler communication unit 310. The ENQ DATA for querying the state of the coupler 204 and the user terminal 212 is transmitted to the coupler 204 through.

When the coupler 204 receives the ENQ DATA from the line multiple access device 203, if it is in a normal state, the coupler 204 transmits ACK DATA to the line multiple access device 203, and the line multiple access device 203 transmits the ACK DATA. When the microcontroller 305 senses through 310, the state of the coupler 204 and the user terminal 212 is determined to be a normal state, and the other coupler 204 is continuously scanned.

However, when an abnormal condition occurs or an alarm occurs in the coupler 204 or the user terminal 212, the coupler 204 transmits the abnormal state information message of the coupler 204 or the user terminal 212 to the line multiple access device 203. And the abnormal state information message of the coupler 204 or the user terminal 212 to the multiple access device 203, and the microcontroller 305 of the line multiple access device 203 communicates with the coupler communication unit 310. This is received and notified to the computer center 208 through the computer center communication unit 304, and if the coupler 204 does not wait for a predetermined time for the response to the ENQ DATA from the line multiple access device 203, the coupler ( 204 is notified or the user side line 313 is disconnected.

Also, when each utility company 209 requests data from the user terminal 212, such as meter reading, medical care, traffic, control, or the like, and transmits the data to the user terminal 212, the utility company 209 is a computer center 208. When transmitting various data request and transmission command messages to the line multiple access device 330 through the line multiple access device 330 is received from the micro-controller 305 through the computer center communication unit 304, and analyzed by multiplexer control After controlling the multiplexer 300 through the signal generator 303 and connecting the subscriber line 313, the microcontroller 305 transmits a work command message to the coupler 204 through the coupler communication unit 310. do.

The coupler 204 receives the work command message from the preferred multiple access device 203, and as a result transmits the message to the line multiple access device 203, which is then transmitted by the coupler communication unit 310. The microcontroller 305 receives and notifies the computer center 208 through the computer center communication unit 304, and the computer center 208 again reads a user, such as meter reading, medical, transportation, and control, to the public utility company 209. Various information processing is performed by requesting data of the terminal 212 or receiving a result of transmitting data to the user terminal 212.

As described above, when the coupler 204 does not wait for a certain time for a response to the work command message from the line multiple access device 203, the coupler 204 is notified of the failure of the coupler 204 or the disconnection state of the user side line 313. Done.

As described above, the present invention can quickly cope with the alarm status of the home to the utility company 209, which is a service provider, in various emergency states of the subscriber terminal without affecting the subscriber's line use or the existing communication network even while using the line. Various information processing services that require data from the user terminal 212, such as meter reading, medical care, traffic, control, etc. from the company 209 or transmit data to the user terminal 212 using an existing line, It can be provided regardless of use.

In addition, by connecting the multiplexer 300 and the line multiple access device 330 by a simple control signal 314 to operate the multiplexer 300, its installation and maintenance is easy and can flexibly cope with the increase of subscribers There is also an advantage.

4 is a configuration diagram of the coupler 204 when an abnormal state occurs in the subscriber line 403 and the coupler or the user terminal 212 connected in parallel with the coupler 204, or when an alarm occurs and when it is not in a normal state. Receives the status (DATA) of the status statement from the line multiplexer 203, transmits the status information message to the line multiplexer 203, and receives any work command message from the line multiplexer 203 As a result, the message is connected to the line multiplexer communication unit 401 which transmits a message through the bidirectional communication with the line multiplexer 203 and the microcontroller 400 and the coupler 204 which control the respective parts. Communication between the user terminal 212 and the coupler 204 and the user terminal 212 for detecting the state of the user terminal 212 and the line state and the line state. Track for (4 05), which normally communicates with the lower user terminal 212 to check the state of the user terminal 212 and the state of the coupler 204, and if the state of the coupler 204 and the user terminal 212 is in a normal state Respond with an ACK to DATA (ENQ) of the status statement from the connecting device 203, and if not, transmit the abnormal status information message of the coupler 204 and the user terminal 212, and from the line multiple access device 203 As a result, the message is transmitted through the bidirectional communication with the line multiple access device 203.

FIG. 5 shows the failure status of the coupler 204 and the user terminal 212 and the alarm occurrence status or any work command message of the utility company 209, regardless of whether the subscriber line is used (off-hook or off-hook). As a coupler 204 communication unit which can obtain the result message without affecting the existing call through bidirectional communication between the line multiple access device 203 and the coupler, the original signal is transmitted to subscriber line (TIP) 511 and RING 512. Modem 501, which transmits signals in in-phase and transmits the signals received from subscriber lines (TIP 511 and RING 512) to the in-phase coupling transformer 510 which carries only in-phase signals to the secondary side. TX GAIN control unit 508 that adjusts the GAIN of the analog signal at the time of data transmission, and TX ENABLE switch 509 and the other party connected under the control of the microcontroller 305,500 to transmit the actual analog signal. To receive the analog signal from the RX ENABLE switch 507 and the subscriber line (TIP 511, RING 512) connected under the control of the microcontroller 305, 500 to remove the noise of the analog signal. RX GAIN that adjusts the GAIN of the noise canceling unit 506, the power noise canceling unit 505 to remove power noise, the high pass filter 504, the low pass filter 503, and the analog signal. Modem 501 performing demodulation of the control unit 502 and the analog signal, and modulation of the digital signal, and digital data and carriers received from the TX ENABLE switch 509 and the RXENABLE switch 508 and the modem 501. It is composed of microcontrollers 305 and 500 that are in charge of control.

As described above, in the related art, the scanning time of the subscriber terminal unit 22 of the scanner 18 is obtained because the presence or absence of an alarm state of the subscriber terminal unit 22 is obtained through the FSK modem communication when the subscriber telephone is in the on hook state. In the case of an off-hook state and an alarm occurs, the alarm occurrence state is detected by using the frequency of the inaudible band between the scanner 18 and the subscriber terminal unit 22, but eventually alarm information is detected through FSK modem communication. Defects affecting an existing call when the subscriber is busy and the scanner 18 periodically scans the state of the subscriber terminal units 22, 23 and 24 as shown in the system configuration of FIG. If the line (19, 20, 21), which is the connection between the (18) and the subscriber line (14, 15, 16) to accommodate a large number of subscribers, many line connections are required. It is very difficult and can cause a price increase, and not only the management of the existing telephone lines (14, 15, 16) but also the management of the connecting lines (19, 20, 21) will not only cause a lot of difficulties in terms of operation, but also a scanner. In (18), since the first, second, and third multiplexers 25, 26, and 27 are selected to connect the connection lines 19, 20, and 21 at different times to accommodate a large number of subscribers. In this case, since the multiplexing ratio is closely related to the efficiency of the scanner 18, if multiplexers 25, 26, and 27 are built in, it will cause a price increase and currents without multiple multiplexers 25, 26, and 27 will be installed. With this structure, the multiplexing ratio will be high and the efficiency of the scanner 18 will be reduced.

However, according to the present invention, the failure state and the alarm occurrence state of the coupler 204 and the user terminal 212 are existing regardless of whether the subscriber line 313 connected in parallel with the coupler 204 is used (off-hook or off-hook). Since the information is obtained through bidirectional communication between the line multiple access device 203 and the coupler 204 without affecting the call at all, there is no need to check whether the subscriber line 313 is used or not. The circuit and its control are simple, and the time for scanning the coupler 204 in the line multiple access device 203 is fast, so that the coupler 204 can be scanned in a short time, so that it can quickly cope with an emergency and the subscriber line ( Even in the busy state of 313, data communication is possible without any influence on the existing call, so that the efficiency of the existing line can be improved, and various additional services can be realized. It would have advantages.

Claims (5)

A system for collecting and processing various types of information generated in a subscriber's home through a line such as a telephone network or an interphone network existing as an existing voice communication network and serving a corresponding service path, wherein the subscriber's handset 205 and Multiplexing means for mechanically coupled to the distributor 201 used for the line connection between the existing communication network 200 and multiple access to the line, and connected in parallel with the handset 205 to the line 206 And coupling means for coupling the user terminals 212 in the subscriber's home, the multiplexing means in response to an authorized work command, and accessing the line to collect and process the coupling means and the information. A line multiple connecting means for performing communication required for the line and the line multiple connecting means applying the work command to the line multiple connecting means and Collecting and processing the scanned information by the connecting means to the remote service system which is characterized by having a host processing unit for service to the service path. The multiplexer controller 302 of claim 1, wherein the multiplexing means applies a relay 301 connected to the line on the communication network 200 side, and a control signal for controlling an opening / closing operation of the relay 301. Remote service system, characterized in that consisting of. The method according to claim 2, wherein the line multiple connecting means controls the entire operation required for the remote service according to the work instruction applied from the host processing means through the computer center communication unit 304 regardless of whether the line is used or not. A multiplexer control signal generator 303 for applying a control signal for opening and closing the relay 301 to the multiplexer controller 302 in response to the control of the microcontroller 305 and the controller 305, And a coupler communication unit (310) which communicates with the coupling means regardless of whether the line is used or not when the relay (301) is switched. In the scanning method of the user terminal 212 located in the terminal of the remote service system, when there is no request of data of the user terminal 212 requested by the utility company 209, the microcontroller of the line multiple access device 330 The control unit 305 controls the multiplexer control signal generator 303 to transmit the multiplexer control signal 314 to the multiplexer control unit 302, and the multiplexer control unit 302 analyzes the signal and relays the signal to the corresponding relay 301. Send the signal 312 to operate the relay 301, the subscriber line 311 and the user side line 313 of the communication network 200 is electrically connected, and then the TX in to transmit data to the coupler 204 After connecting the enable switch 509, the ENQ data for querying the state of the coupler 204 and the user terminal 212 through the coupler communication unit 310 is transmitted to the coupler 204 and receives data from the coupler 204. To do T When the X enable switch 509 is disconnected and the RX enable switch 507 is connected and the ACK data is received from the coupler 204 through the coupler communication unit 310, the coupler 204 and the user terminal 212 may be disconnected. The microcontroller 305 of the line multiple access device 203 determines the normal state, continues scanning the other coupler 204, and receives the abnormal state message from the coupler 204 through the coupler communication unit 310. Is notified to the computer center 208 through the computer center communication unit 304, and the coupler 204 of the coupler 204 does not wait for a predetermined time when the coupler 204 does not wait for a predetermined time. And scanning whether or not the subscriber line 313 is notified of a defect or disconnection of the subscriber line 313. The apparatus 330 of claim 4, wherein the utility company 209 requests data from the user terminal 212, such as meter reading, medical care, traffic, control, or the like, and transmits the data to the user terminal 212. After transmitting various data requests and transmission command messages, the line multiple access device 330 receives the microcontroller 305 through the computer center communication unit 304 and analyzes the multiplexer through the multiplexer control signal generator 303. Control the 300, connect the corresponding subscriber line 313, connect the TX enable switch 509 to send the work command message to the coupler 204, and then couple the coupler 204 via the coupler communication unit 310. Receive the operation result message from the, and the result message is notified to the computer center 208 through the computer center communication unit 304 from the track multiple access device 203 and the computer center 208 again the public utility company (209) Meter reading, Method which comprises performing the various kinds of information processing fee for transportation requirements, such as control data of the user terminal 212 and receiving a result of the data to be transmitted to the user terminal (212).