JPS61199367A - Public telephone set - Google Patents

Abstract

PURPOSE:To detect a fault of a dial sending circuit and a charging signal reaction circuit by providing a counter counting in response to hooking and reset by an output of the charging signal reception circuit and a discriminating means discriminating that the count reaches a prescribed value. CONSTITUTION:When the execution of a program transfers to hooking processing, a CPU 111 restores a GS relay 103 via a restart circuit 102 at first to open a DC loop thereby restoring an exchange. After 1,200ms is elapsed, after the CPU 111 confirms that on-hook is consecutive, the CPU 111 checks whether or not a flag representing the reception of a charging signal in a prescribed area in an RAM of the 1st memory 114 is set and when no flag is set, the count of a check counter of the 2nd memory 112 is incremented by 1. As a result, when the counter reaches '50', the CPU 111 discriminates it as an error, applies alarm sending processing to inform the error to the center and resets the check counter.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a public telephone equipped with a dial sending circuit and a billing signal receiving circuit.

[Conventional technology]

Conventionally, methods for detecting abnormalities in public telephones of this type by the telephone itself are as follows:
782), which performs self-diagnosis by closing the loop off-hook and notifies the user;
As shown in No. 898), self-diagnosis is performed by closing the loop off-hook, and only when there is an abnormality, the loop is re-captured and the center is automatically dialed to notify the details of the abnormality. As proposed in No. 212653, there is a system that performs self-diagnosis when automatically responding to an incoming call from a center, and if there is an abnormality, notifies the center of the abnormality.

[Problem that the invention seeks to solve]

However, since all of these methods utilize self-diagnosis, it is not possible to check for failures in the dial sending circuit and billing signal receiving circuit.

[Means for solving problems]

In order to solve these problems, the present invention focuses on the fact that in the case of these failures, the off-hook operation becomes on-hook without reception of a charge signal, and performs a counting operation according to the hook operation. This system includes a counter that is reset by the output of the billing signal receiving circuit, and a determining means that determines whether the counter has reached a certain value.

[Effect]

The fact that there is an output from the above determination means means that the on-hook state has continued for a predetermined number of times without receiving a billing signal in response to an off-hook operation. can be detected.

〔Example〕

FIG. 1 is a block diagram showing an embodiment in which the present invention is applied to a central power supply type public telephone.

In the figure, LA and LB are line terminals to which lines from the station are connected, and the charging signal from the station is transmitted between these two terminals.
It arrives as a KHz signal. G is a ground terminal. 10 is a main unit including a telephone call circuit; 20 is a hand cent; 30 is a keyboard including dial keys configured in a 3×4 matrix; 40 is a display circuit for displaying credits (unused coin amount), etc. with a liquid crystal display element; 50 is a coin processing unit equipped with various sensors and electromagnets (magnets) that sorts, accumulates, stores, and returns coins.

Here, when the hook switch 101 sends out an output indicating off-hook due to the operation of the hand center 20, the start circuit 102 responds to this and drives the GS relay 103, which closes the GSIJ relay contact 104 and receives the billing signal. The communication circuit 107 is connected to the line terminals LA and LB via the circuit 105, the diode bridge and the power unit 106.
, and closes a DC loop to the line to enable telephone communication using the handset 20. Note that the power unit generates a local power supply voltage using the line current that flows when the DC loop is closed, and supplies the system power supply voltage E to each part by closing the GSIJ relay contact 108. , that is, even while the DC loop is open,
The loop shown by arrow A in the figure charges the capacitor by flowing current to the extent that the exchange does not respond through a high resistance (not shown), and backs up the capacitor to the variable memory (RAM) that constitutes the second memory for the counter, which will be described later. Supplies the power supply voltage for the amplifier. The diode bridge is used to keep the polarity of the line current supplied to the power unit constant.

In addition, Ql is a transistor for dial pulse sending, Q
1 is a transistor for short-circuiting the calling circuit 107 while sending dial pulses, and 109 is a tone generator, which generates another tone when the accumulated coins are insufficient.
7 to the handset of the hand cent 20 to prompt the user to insert additional coins, and in the case of the MF dial system, a dial signal is sent to the telephone line through the tone sending circuit 110. This tone generator 109
14, keyboard 30, display circuit 40. Like the coin processing unit 50 and the like, it is controlled via input/output ports 112 and 113 by a processor unit (hereinafter abbreviated as CPU) 111 such as a well-known microprocessor.

The transistor R constituting the output gate is a resistor. The aforementioned start circuit 102 is also directly controlled by the output of the hook switch 101, and is also controlled by the CPU 111. In addition, 114 is a fixed memory (ROM) that stores programs and other fixed data, and a variable memory (ROM) that stores programs and other fixed data.
115 is the second memory, 116 is the CPU 111, an input/output capo) 11
2, 113, and memories 114 and 115.

Therefore, the control operation by the CPU 111 will be explained next, but the following explanation is limited to the scope necessary for understanding the present invention, and parts not directly related to the features of the present invention will be omitted as appropriate. This also applies to FIG.

FIG. 2 is a flowchart showing the main processing program executed by the CPU 111. In the figure, when the DC loop is closed due to off-hook and the power supply voltage reaches the specified value as described above and the power-on reset is canceled, the CPU 111 performs initialization processing (step 210) and registers in the RAM. Initializes the input/output port buffer registers, etc. Note that interrupts are enabled at the final stage of this step. That is, in this embodiment, there is an interrupt processing program in addition to this main processing program, and the interrupt processing program is executed at a certain interval time, for example, 4m8.
Each time the main processing is interrupted, the interrupt processing is executed. Processing such as sensing of each input including manual dial key input from the keyboard 30 and input from the receiving circuit 105 and selection of inserted coins is performed by interrupt processing.

So, to explain the main processing, after initialization,
The CPU 111 performs self-diagnosis processing (step 22).
0) Check for failures such as coin jams 7, and if there are no abnormalities, perform a usage permission process (step 230). This allows dialing if a coin (of course, a specified genuine coin) is inserted. Next, dial control processing is performed (step 240).

This is to check special dial numbers from the first to third digit dial numbers, such as various prohibited dials and toll-free dials, and a mode flag is set in a predetermined area of the memory 114 to indicate this. .

Next, the process moves to the coin storage determination process (step 250
), This is a step in which it is determined whether coin storage is necessary, the amount thereof, etc. in accordance with the billing signal and the accumulated coins.In the above-mentioned free mode, of course, it is determined that coin storage is unnecessary. Next, the CPU 111 accesses a predetermined area in the -RAM, and after confirming that the hook flag is not set (step 260), proceeds to coin storage processing (step 2TO). That is, a predetermined storage magnet in the coin processing unit 50 is operated to move a corresponding storage lever, thereby opening a passage from the storage track to the safe. On the other hand, if the hook flag is set due to on-hook or the occurrence of some forced disconnection event, for example, due to the above-mentioned prohibition mode, the program execution proceeds to step 270.
Then, the process immediately shifts to hook processing (step 280).

Next, this hook processing will be explained using FIG. 3.

In FIG. 3, when the execution of the program shifts to hook processing, the CPU 111 first runs the start circuit 102.
The GSIJ relay 103 is restored via the network, the DC loop is opened, and the exchange is restored (2801).

After 1200m (step 2802), CPU
111 confirms that on-hook continues (step 2803), and then updates the RAM of the first memory 114.
Step 280: Check whether a flag indicating that a charging signal has been received is set in a predetermined area in the area.
4), if the flag is not set, the second memory 115
1 is added to the count value of the check counter (step 2805), and if the count value becomes 50 (step 21106), the CPU 111 determines that there is an abnormality and sends an alarm as described below. After processing and reporting the abnormality to the center (step 2807),
Reset check counter (step 280B)
), therefore, the center that receives the report can immediately take appropriate action.

After that, if off-hook continues (step 280
9), the CPU 111 will eventually stop operating due to power down, but if there is a subsequent off-hook, the CPU 111 will close the DC loop and end the hook processing (step 28).
10), move on to initialization processing (step 2)
10).

On the other hand, if the billing signal is received before the count value of the check counter reaches "50" (step 2804)
, the CPU 111 immediately resets the check counter (step 2811). Therefore, after going off-hook, there are five cases in which the system goes on-hook without receiving a billing signal.
An alarm will only be sent if it occurs zero times in a row. In this embodiment, as described above, the count is increased under the on-hook condition after the DC loop remains open for 1200 m, so the count value is not updated by mere hooking.

Next, the alarm sending process will be explained using FIG. 4.

In FIG. 4, when the execution of the program shifts to alarm sending processing, the CPU 111 attempts to re-capture the DC loop (step 28071), and waits for 3 seconds before the dial tone is sent (step 2g072).
), automatically dials a predetermined destination, that is, the center (step 28073). After allowing 30 seconds for the called party to respond (step 28074)
), sends predetermined alarm information to the telephone line, and notifies the center of an abnormality in the dial sending circuit or billing signal receiving circuit (step 28075). After that, the DC loop is opened in step 2807a), tzoom
After waiting for a period of time a to elapse (step 28077), this alarm sending process is ended.

Above, we have explained an example in which the center is immediately notified when the count value of the check counter reaches a certain value.
This abnormality is memorized by setting an abnormality flag in a predetermined area inside the system, and this is checked during self-diagnosis as described in (a) to (c) above and the user or (and) the center is notified. You can also do this.

Furthermore, upon detection of an abnormality, a malfunction indication may be immediately displayed to the user, and a mechanical or magnetic latching indication may be displayed for the next user even while on-hook.

Further, although the check counter is incremented when the power is turned down due to on-hook, it may be incremented in advance when power is turned on due to off-hook, and then reset when the billing signal is received.

In addition, the count value is held in the RAM that is backed up even during on-hook, but such a bank amplifier R
If there is no AM, a mechanical counter may be used.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a counter that performs a counting operation in response to a hook operation and is reset by the output of the billing signal receiving circuit, and a determining means that determines whether the counted value has reached a certain value. By providing this, it becomes possible to detect abnormalities in the dial sending circuit and billing signal receiving circuit, which could not be checked by conventional self-diagnosis, from the output of the determining means.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a flowchart showing an example of a main processing program in the CPU, Fig. 3 is a flowchart showing an example of a hook processing program, and Fig. 4 is an alarm sending process. It is a flowchart which shows an example of a program. 10... Main unit, 20... War hand cent,
30... Lu keyboard, 50... Coin processing unit, 101... Φ hook switch, 102... Start circuit, 103...-GS relay, 104, 1
08---GS relay contact, 105---Charging signal receiving circuit, 107---Telephone call circuit, 109---
)-n generator, 110. .... Tone sending circuit, 111...CPU, 114...
- First memory, 11511...Second memory for counter. Figure 2

Claims (1)

[Claims] A public telephone equipped with a dial sending circuit that sends a dialing signal to a telephone line in response to a user's dialing operation, and a billing signal receiving circuit that receives a billing signal that arrives via the telephone line. A counter is provided, which performs a counting operation accordingly and is reset by the output of the billing signal receiving circuit, and a determining means for determining whether the counted value of this counter has reached a certain value. A public telephone set that detects abnormalities in a dial sending circuit and a billing signal receiving circuit.