JPH0552108B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a public telephone remote monitoring system, and more specifically, the present invention relates to a public telephone remote monitoring system. It is related to a system for doing so.

[Prior art] Conventionally, in order to test the status of public telephones,
Testing was carried out by operators operating a test stand that was grounded inside the telephone office. Additionally, this test is only conducted when a malfunction is reported by a user and during patrol inspections of public telephones.Therefore, there may be times when a malfunction is not discovered, or even if it is discovered, it is not reported. When left unattended, public telephones became unusable, leading to a decline in usage efficiency.

[Problem that the invention seeks to solve]

In this way, there are an extremely large number of public telephones, and it is difficult to monitor them all at the same time.
However, it is technically difficult and expensive, so constant monitoring has not been carried out. Therefore, if there was a delay in reporting a malfunction by a user, the malfunction often lasted for a long time.

The purpose of the present invention is to improve such conventional problems and to constantly remotely monitor public telephones.
It is an object of the present invention to provide a public telephone remote monitoring system that can shorten failure time and also monitor traffic such as the number of calls and call completion rate.

[Means for solving problems]

In order to achieve the above object, the public telephone remote monitoring system of the present invention provides a public telephone (10 in FIG.
In a public telephone remote monitoring system installed in a telephone office that accommodates a plurality of telephone lines connected to a public telephone 100, the line voltage of each telephone line connected to the public telephone 100 is constantly scanned at a specific cycle. Measuring means 12, 13, 14 and measuring means 1
2, 13, and 14, the states of the telephones such as idle, outgoing, busy, and malfunctioning are determined from the voltage values, and the determined information is stored in the storage device 15 in chronological order for each call line.
and means 104 for analyzing the information after accumulating the information.

[Effect]

In the present invention, by constantly monitoring the telephone lines of public telephones from within the telephone office,
Understand the status of your phone (free, calling, busy, and out of order). In other words, it constantly monitors remotely and reads the idle, calling, and busy statuses.
For general public telephones, malfunctions are determined based on past usage conditions, and for credit card public telephones,
When the error relay operates, the public telephone notifies the maintenance personnel at the telephone office of the failure. In the present invention, all monitoring can be performed automatically without manual intervention as in the past, which results in increased revenue due to shorter failure times, reduction in the number of operating hours and personnel dispatched for failure repair, and efficiency. management of public telephones becomes possible.

〔Example〕

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

FIG. 1 is a block diagram of a public telephone remote monitoring system according to the present invention.

In FIG. 1, 100 is a public telephone, 101
1 is a public telephone remote monitoring device connected to a telephone subscriber line accommodating a public telephone, 102 is a communication path of the exchange, 103 is an outgoing trunk, and 104 is used for displaying traffic conditions, etc., and is connected to the monitoring device 101 by a line. It is a data processing system. Furthermore, within the public telephone remote monitoring device 101,
Reference numeral 11 denotes an interface circuit (INF) that provides an interface between the subscriber line (line A) and the multiplexer (MPX) 12. In other words, this interface circuit 11 is connected to the subscriber line voltage (48V).
is converted into a voltage on the multiplexer 12 side, and provides overvoltage protection for the multiplexer 12. Multiplexer 12 accommodates the maximum
It has a function of sequentially connecting lines from 512 public telephones to the A/D converter (A/D) 13 side according to the specifications of the processing unit (MPU) 16. When scanning the 521 line, it is scanned at a cycle of 200 mS or less so that the calling state can be detected. Analog digital converter 13
is a converter for converting an analog signal into a digital signal. 14 is a processing device that constantly monitors the state of the public telephone, stores the monitoring results on the RAM 15, and performs corresponding processing in response to requests from the data processing system 104. Further, 15 holds a control program.
It is a storage device consisting of ROM and RAM that holds monitoring results. 18 in the public telephone 100
is a circuit consisting of an error relay contact and a high resistance to notify the central office when the power is cut off. Further, 16 in the data processing system 104 is a repair device that inputs monitoring data from the remote monitoring device 101 and edits and outputs it according to user instructions, and 17 is a printer that prints the processing results of the processing device 16. It is.

The public telephone remote monitoring device 101 shown in FIG. 1 constantly measures the line voltage of telephone subscriber lines.
Identify the status of all public telephones connected to that subscriber line. There are three types of status: idle, calling, busy, and four types: out of order.

The processing device 14 in the remote monitoring device 101 (a) constantly measures the voltage of the telephone line in which the public telephone is accommodated using the subscriber line monitoring program, determines the line status, and determines whether a call is being made, a call is in progress, or a call is being made. In addition to identifying and storing the status in RAM such as idle or out of order, (b) updating the software clock using a data management and time management program, adding charges for paid calls on public telephones, and updating the RAM every hour. A plane designation counter (not shown) is operated to switch the area to be stored. (c) The communication processing program establishes a data link with the data processing system 104, analyzes the request from the processing system 104, reads the requested data from the RAM, and transfers the data to the processing system 104. Transfer to. In this way, the remote monitoring device 10 of the present invention
1 has the functions of constantly monitoring the status of public telephones, managing data and time regarding each public telephone, and performing communication processing to transfer necessary data to the processing system.

FIG. 2 is a diagram for explaining the principle of state determination by the remote monitoring device of the present invention.

The detection principle of the public telephone remote monitoring device 101 shown in FIG.
The state of each telephone is divided into four categories: calling, busy, and malfunctioning, and constantly monitors how much voltage has changed by comparing the state of each telephone with the line voltage when it is idle. is going on.

As an example, (a) "vacant" refers to a state where the telephone is not in use. The line voltage of the telephone when it is idle is equal to the battery voltage of the central office. That is, as shown in FIG. 2, the voltage between the subscriber lines A and B is measured, and when the voltage is -48±5V, it is determined that the line is vacant. (b) Calling refers to the period immediately before the first billing pulse is applied after the other party answers due to off-hook, and it is recognized that the line voltage is much lower during this period than when it is idle. The first charge pulse is recognized by a temporary polarity reversal of the line voltage. In other words, as shown in Figure 2, E (-48±5V) x 88%
It is determined that a call is being made in the following cases. (c) On a call means
This refers to the period from the first billing pulse to the end of the episode. When the call ends, the line voltage of the telephone is restored to its idle state. That is, as shown in FIG. 2, when E×11% or less, it is determined that a call is in progress. (d) What is a failure state?
By creating and notifying an intermediate state in which the telephone is neither idle nor incoming by a failure notification circuit within the telephone, it is possible to make a determination within the telephone office. In other words, the voltage created by the failure notification circuit is E x 91% ± 3
%, so when this voltage is detected, it is determined that there is a failure.

By performing such operations, several hundred public telephone lines can be remotely monitored at all times with one scan adapter, and public telephones will not be left out of order for long periods of time.

FIG. 3 is a diagram showing an example of information stored on the RAM of the public telephone remote monitoring device in FIG. 1.

As shown in Figure 3a, the information stored on the RAM is divided into 1 day's worth of information storage area into 0 to 23 sides, and 1 hour's worth of information is stored in each divided storage area. do. As shown in FIG. 3B, the information stored on each side is information corresponding to lines, that is, measurement information for lines #0 to #511. Furthermore, the data structure for each line is
As shown in FIG. 3c, four types of data are stored: the total number of outgoing calls, the number of completed calls, the duration of the call (in seconds), and the presence or absence of an error bit (1 bit).

FIG. 4 is a detailed configuration diagram of main parts of the interface circuit and multiplexer section in FIG. 1.

The sensor section of the interface section 11 is connected to one multiplexer 12 for every eight subscriber lines, and by arranging 64 pairs of sensor sections and multiplexer sections 12, it is possible to monitor 512 lines. In FIG. 4, only scan circuits for eight lines are shown.

In the interface unit 11, a scanning matrix is configured, and when the public telephone is on-hook, that is, in an idle state, the subscriber line voltage E (-48V±5V)
By dividing the voltage by resistors R ₁ and R ₂ , it is converted to the voltage on the multiplexer 12 side (approximately 1/8 to 1/9 value) and input to the units 0, 1, ... 7, and the diode D ₁ and _D2 provide overvoltage protection for the multiplexer 12. Here, R ₁ is a high resistance, for example, 910KΩ, and R ₂ is a 100KΩ resistor. Voltage less than 0.88E in calling state,
A voltage of 0.11E or less in a call state and a voltage of (0.91±0.03)E in a fault state are respectively converted into corresponding voltages on the multiplexer 12 side and input to the terminals. Output terminal of multiplexer 12
The output from the INH is input to a decoder which decodes which multiplexer 12 and also identifies which of the lines 0-7 of that multiplexer 12 it is. The captured voltage is input from the output terminal COM of the multiplexer 12 to the A/D converter 13 at the next stage.

FIG. 5 is a processing flowchart of the processing device of the public telephone remote monitoring device shown in FIG.

FIG. 5a shows the subscriber line monitoring program. This measures the subscriber line voltage and
An operation is performed to store the measurement information in RAM. This program is activated by an A/D interrupt approximately every 0.4 mS21. After starting up, first specify the monitoring circuit (specify the A/D converter) 2
2. After performing A/D conversion 23, determining the line state 24. By determining whether or not there is a change 25, if there is a change, and if it is a call, 1 is added to the total number of calls 26. Also, if it is a call start, add 1 to the number of completed calls 2
7. Furthermore, if a failure has occurred, the error bit is set to 1 (28). Also, in case of recovery from a failure,
Set the air bit to 029. This action
Execute for 512 lines for each line. and,
As mentioned above, information for 512 lines is stored on the 0th side of the RAM.

FIG. 5b is a program operation flow for data management and time management.

This program triggers an interrupt every 200mS31. First, run the clock program 3
2. If the update is 1 second, update the software clock 3
If the update is 3,351 hours, the surface counter is updated 34,36. When the surface counter is updated,
Surfaces 0 to 7 of the storage area are sequentially switched, and the measured information is stored in the switched surface. When the software clock is updated, paid calls will be added and 3
7. Increase the leading call time by 138. Here, if there is an error bit, an alarm is sent out and the data is printed on the printer.

FIG. 5c shows a communication processing program. This program performs interrupt activation 41 from the personal computer, which is the processing device 14 in the remote monitoring device 101, and establishes a data link 43 between the personal computer (scan adapter) and the data processing system 104. Then, the request from the data processing system 104 is analyzed 43.
At that time, if the month and date are not accurate (44), the clock is corrected and the software clock is controlled (35), and if it is accurate, it is determined (45) whether the request from the processing system 104 is for data transmission. When sending data,
Extract specified data from the corresponding side of RAM 4
8. Send the retrieved specified data to the processing system 49. Also, if the communication has ended, 46,
The data link is disconnected 47 and the process ends.

As described above, according to the present invention, usage information can be obtained early by storing information such as the number of calls made and the call completion rate of a public telephone, so that overall public telephones can be managed. In addition, by comparing the number of calls made in the past with the software, it is possible to carry out efficient and focused inspection work on public telephones. Furthermore, with regard to card telephones, by adding circuits for failure notification and recovery, it is possible to detect failures immediately and to recover immediately by sending a signal from the central office of failures due to error relay malfunction.

〔Effect of the invention〕

As explained above, according to the present invention, the status of public telephones can be remotely monitored at all times, so not only can failure time be shortened, but it is also possible to monitor traffic such as the number of calls made and call completion rate. As a result, the benefits are significant, such as improved service to users, increased revenue due to shorter failure times, and reduced dispatch work for failure repairs.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a public telephone remote monitoring system showing an embodiment of the present invention, FIG. 2 is a diagram showing the principle of determining the state of a public telephone according to the present invention, and FIG. 3 is a remote monitoring device of FIG. 1. Fig. 4 is a detailed circuit diagram of the interface section and multiplexer section of the remote monitoring device shown in Fig. 1, and Fig. 5 shows the processing inside the remote monitoring device shown in Fig. 1. This is a processing flowchart of the device. 101...Public telephone remote monitoring device, 100...
...Public telephone, 102...Call path of exchange, 10
3...Output trunk, 104...Processing device for printing traffic status, 11...Interface section, 12...Multiplexer section, 13...Analog-digital conversion section, 14...Processing unit (MPU), 15... ... Storage device consisting of RAM and ROM, 16 ... Data processing device, 17 ... Printer, 18 ... Error relay contact for notifying the telephone office when the power is cut off.

Claims (1)

[Claims] 1. In a public telephone remote monitoring system installed in a telephone office that accommodates multiple telephone lines to which public telephones are connected, the line voltage of each telephone line to which a public telephone is connected is constantly scanned at specific intervals. a means for measuring, and a means for determining the status of the telephone, such as idle, outgoing, busy, and malfunctioning, from the voltage value, and storing the determined information in a storage device in chronological order for each call line; A public telephone remote monitoring system comprising: means for analyzing.