JPS5923662B2 - Remote monitoring method for public telephones - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides, when the cumulative value of coins stored in a public telephone exceeds a predetermined threshold, an alarm to prompt collection, destruction of the public telephone, abnormal state such as theft, or disconnection of the telephone line. The present invention relates to a remote monitoring system for public telephones that sends out warnings to notify the public.

Conventional public telephones do not have a means to notify a distant place (for example, a telephone office) of the cumulative value of stored coins, or to automatically remotely monitor abnormal conditions such as destruction or theft of public telephones, or disconnection of telephone lines. . Therefore, when the coin storage box of a public telephone is full, calls from the public telephone are interrupted, and there is no other option than to wait for the collector to come around and process the call. In addition, abnormal conditions such as destruction or theft of public telephones are only detected when bill collectors make their rounds or during periodic tests using the switchboard testing equipment, and the public is sent to the waiting area of a maintenance worker who is waiting at a remote location. It was not possible to immediately send out a warning of the abnormal state of the telephone. The purpose of the present invention is to eliminate these drawbacks by providing a monitoring device between a public telephone and an exchange that has the function of detecting the state of the public telephone, thereby making it possible for maintenance personnel waiting at a remote location to This makes it possible to notify of abnormal conditions in public telephones.

A detailed explanation will be given below based on examples. FIG. 1 is a diagram for explaining the first embodiment of the present invention, and is a block diagram showing the configuration of a public telephone equipment and an exchange EX, and a public telephone monitoring device SUPU provided between the public telephone equipment and the exchange EX. It is.

FIG. 2 is a circuit configuration diagram applied to the public telephone monitoring device SUPU of FIG. 1. In FIG. 1, a relay C in a public telephone is activated when the number of coins stored in the public telephone exceeds a predetermined threshold.

The resistor R is a constant voltage element ZD and a transistor T when the telephone equipment is in normal operation. base (including resistor RB, see Figure 2) - relay A coil one terminal b1 one terminal B. - Foot switch HS-C relay contact c - resistor R - terminal A. The current value of the loop circuit flowing in the path from one terminal a1 to the relay A coil and one battery is made smaller than the dead current value and open current value of relay A, and the current of the loop circuit that is shunted to the constant voltage element ZD is set to the specified value. Amount of voltage drop in voltage element ZD (
A resistance value is set so that the reverse voltage) is in the saturation region of the constant voltage element ZD. Public telephone monitoring device S
Relay SU of UPU (hereinafter abbreviated as monitoring device SUPU)
P is a relay that monitors a loop circuit formed by the public telephone device and the monitoring device SUPU during normal times.

In addition, this relay SUP is inactive when forming the loop circuit, and when the loop circuit is open, that is, when the parallel resistance (insulation resistance) of the normal subscriber line is It is controlled by a transistor circuit that monitors and amplifies the reverse voltage of the constant voltage element ZD so that it is activated when there is or no current that is less than the leakage current. In the embodiment shown in FIG. 2, the constant voltage element ZD is used as a so-called shunt in the current measuring circuit, and the reverse voltage is set so as to suppress the voltage drop in the shunt to the necessary minimum. Resistor RB is a transistor T. To ensure the shunting of the constant voltage element ZD while preventing the base current of the transistor T from becoming excessive, and when the reverse voltage thereof is in the saturation region. It is determined so that it is conductive and non-conductive in the unsaturated region. Note that while the public telephone is in use, the loop circuit formed by the public telephone and the monitoring device SUPU is disconnected by the operation of the telephone switch HS, but instead the low resistance loop circuit formed by the public telephone and the monitoring device SUPU is disconnected. A loop circuit is formed in the monitoring device SUPU. Therefore, the value of the loop current flowing through the loop circuit is determined by the constant voltage element ZD.
The current value is such that the reverse voltage of the transistor T remains in the saturation region. The current that holds the transistor T conductive is the current that holds the transistor T conductive. Since the current is shunted to the base of
P's inactivity is maintained. In this case, the monitoring device SUPU
Relay A operates. Also, during dialing, contact D
! The loop circuit breaks due to the break pulse of the transistor T. The current shunted into the base circuit of the transistor T decreases. becomes non-conductive. Therefore, relay SU
There is a possibility that P operates intermittently in response to the break pulse of the dial contact Di. Furthermore, since appropriate measures can be taken within the monitoring device SUPU, there is no problem even if the relay SUP operates. For example, in the two embodiments shown in FIGS. 2 and 4, contact B3 of relay B, which operates while the public telephone is in use, stops the sending of alarms while the public telephone is in use, so dial pulses are used. False alarms are prevented from being sent.
As explained above, the relay SUP of the monitoring device SUPU
Due to this operation, there is no longer enough coin storage capacity in the public phone machine (the C contact opens due to relay C operation).
It is possible to detect that the telephone line connecting the public telephone machine and the monitoring device SUPU is disconnected, or that the public telephone machine is in an abnormal state such as destruction or theft.

△On the other hand, coin storage from the user of the public telephone equipment is handled by a relay K that operates in synchronization with the operation of a contact point Mp of a charging pulse sending relay MP (not shown) provided in the trunk device TRK of the exchange EX. signal device 0SC via contact K2 of
This is done by detecting a 16 kHz signal sent from the public telephone by the coin storage signal receiving device MPR of the public telephone.

Further, the number of times the relay k recovers its operation (the number of stored coins) is updated and stored in the count accumulation circuit CNT by the contact k1 of the relay K. When the count accumulation circuit CNT exceeds a threshold value of the cumulative number of charging pulses set according to the coin storage capacity of the public telephone equipment, the relay 0F is operated under the control of the count accumulation circuit CNT. As is clear from the above explanation, when the coin storage capacity of the public telephone machine runs out, the relay SUP or relay 0F of the monitoring device SUPU is activated.

When only the relay 0F is activated, the alarm control circuit ALMC is activated by its contact 0f1, and an alarm 1 is issued to notify that the waiting area where a maintenance person is waiting is approaching the public telephone machine for collection. Send ALA. When the collection of money at a public telephone is delayed and the coin storage capacity is significantly reduced, the relay SUP is activated, and its contact Supl activates the alarm control circuit ALMC.
2. An alarm is activated to notify the waiting area where maintenance personnel are waiting that payment must be collected immediately. ALB is sent out.
The threshold value at which relay 0F operates and the threshold value at which relay SUP operates are determined by alarm 1. The activation threshold of relay 0F is set smaller than the activation threshold of normal relay SUP, taking into account the time difference between receiving the ALA and collecting coins from the public phone.

Figure 3 shows the contact SUP of the relay SUP of the monitoring device SUPU.
1 is a circuit configuration diagram of an alarm control circuit ALMC for sending an alarm to a maintenance person based on input information of contact 0f1 of relay 0F.

In the figure, terminal ALA is alarm 1, and terminal ALB is alarm 2. Alarm 3, ALC, connects terminal a1 to terminal A in FIG. 1 before relay 0F operates. - High resistance R-C relay contact cm hook switch HS - terminal B. This is an alarm that is sent when the loop circuit of one terminal B is broken and the relay SUP is activated, and it warns of abnormal conditions such as disconnection of the telephone line connecting the public telephone equipment and the monitoring device SUPU, destruction of the public telephone equipment, theft, etc. It shows. The alarm control circuit ALMC is
It can be built into the monitoring device SUPU, installed in the alarm display panel ALMD of the exchange EX, or installed in the maintenance person's waiting room. Next, alarm 1. ALA1
Warning 2. ALB or alarm 3. A description will be given of how the alarm is canceled when the maintenance person collects coins from the public telephone machine after sending out the ALC.

By collecting the coins, the alarm detection relay C of the public telephone is restored, the public telephone is returned to its normal state, and the loop circuit described above is restored.

Therefore, the monitoring relay S of the loop circuit of the monitoring device SUPU
UP will be restored. On the other hand, the monitoring relay SUP1 (representative example) of the loop circuit of the alarm control circuit ALMC is maintained in operation by a self-contact Supll, as shown in FIG. In addition, the monitoring device SUPU indicates that the threshold has been exceeded after sending out the charging signal.
The relay 0F is held by a counting accumulation circuit CNT shown in FIG. After the maintenance personnel collected the coins in this condition,
Alarm release key ARL for monitoring device SUPU
When you operate the alarm control circuit ALMC relay SUPl
will be restored. In addition, the count accumulation circuit C of the monitoring device SUPU
NT is reset. As a result, relay 0F of monitoring device SUPU is also restored. As a result, the alarm control circuit AL
The alarm relay corresponding to the monitoring device SUPU in the MC is restored and the alarm is canceled. As for the relay 0F of the monitoring device SUPU, a contact 0f11 is used as shown in FIG. 3 so that it can be reset only when the threshold value is exceeded, that is, when the relay 0F1 of the alarm control circuit ALMC is activated. This protects the count accumulation circuit CNT in the monitoring device SUPU from being inadvertently set by a reset operation when the threshold value is not exceeded. As explained above, the monitoring device SUPU is installed between the public telephone equipment and the exchange EX, and by detecting the loop circuit formed by the public telephone equipment and the monitoring equipment SUPU, the telephone that connects the public telephone equipment and the monitoring equipment SUPU It becomes possible to notify a maintenance staff waiting in a remote location of abnormal conditions such as disconnection of the line, destruction of public telephone equipment, theft, etc., or of exceeding a threshold for the number of stored coins.

In addition, by providing a count accumulation circuit CNT in the monitoring device SUPU, when the cumulative number of charging pulses exceeds a threshold number set according to the coin storage capacity of the public telephone,
It becomes possible to send out an alarm ALA to notify maintenance personnel that the time for collecting money from a public telephone is approaching.

Therefore, the collector only has to collect the coins from the public telephone machine after the alarm ALA is issued, and there is no longer a need for the conventional coin collection work by patrolling within a predetermined period. In addition, as a result of creating two levels of alarm: alarm ALA and alarm ALB by the operation of relay SUP of monitoring device SUPU, alarm A
It has become possible to distinguish between normal coin collection by LA and immediate coin collection by alarm ALB. FIG. 4 is a circuit diagram of a public telephone monitoring device SUPU, which is a second embodiment of the present invention. In the same figure, the billing signal from exchange EX is A
, B lines are used, and the functions of the counting circuit CNT provided in each monitoring device SUPU in the first embodiment are centrally replaced with the computer CPU. FIG. 5 shows an operation in which the SUPU on the monitoring device side of the second embodiment shown in FIG. 4 interrupts the polarization charging signal from the exchange EX to the public telephone. The public telephone set shown in FIG. 1 can of course be replaced by a public telephone set which operates in response to polarity reversal signals, but since this type of public telephone set is well known, a description thereof will be omitted. The second embodiment will be described in detail below.

In the first embodiment, a count accumulation circuit CNT is provided for each monitoring device SUPU, and an alarm control circuit ALMC is required. In this way, if a large number of counting storage circuits CNT and alarm control circuits ALMC are required in a quantity corresponding to the monitoring device SUPU, it is necessary to centralize the supporting legs using the computer CPU as in the second embodiment shown in FIG. For example, it is possible to replace the count storage circuit CNT with a memory and the alarm control circuit ALMC with a program sequence, thereby achieving economicalization. That is, when the computer CPU receives the state of the contact E4 of the coin storage signal (polarity reversal pulse of the A and B lines) receiving relay E sent from the exchanger EX via the scanning device SCN, the computer CPU A counting accumulation circuit CNT- (e.g. CNT-1) on a memory provided corresponding to the monitoring device SUPU
Add 1 to . This allows the counter storage circuit CNT required for the monitoring device SUPU to be replaced with an inexpensive memory. Count accumulation circuit CNT on memory by program
There is no difference from the first embodiment in that the alarm ALA is sent out when the value of - exceeds a predetermined threshold. Also,
The computer CPU scans the operation of the contact Sup2 of the loop circuit monitoring relay SUP of the monitoring device SUPU to the scanning device SCN.
When detected via the alarm ALB and ALC, alarms ALB and ALC are sent out according to the program sequence as in the first embodiment. In this way, by controlling the monitoring device SUPU with the computer CPU, the count accumulation circuit CNTl alarm control circuit ALM
It is possible to concentrate the functions of C in the inexpensive memory of the computer CPU, which has the advantage of being economical.

As is clear from the above description, the present invention monitors the loop circuit formed by the public telephone equipment and the monitoring device SUPU, thereby detecting abnormal conditions such as destruction or theft of the public telephone equipment and the monitoring device SUPU. It is possible to detect disconnection of the telephone line between

In addition, it is possible to detect when the storage capacity of the coin storage box in the public telephone is approaching its limit, and in combination with the operation information of relay 0F of the counter storage circuit CNT, the person in charge of collecting the coins can be notified when the coin storage in the public telephone is in progress. can be reported. Furthermore, by constantly remotely monitoring the status of public telephone stations, it is possible to significantly reduce the work of inspecting public telephone stations and railway lines and collecting money through regular patrols.

[Brief explanation of the drawing]

1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a circuit configuration diagram applied to the monitoring device SUPU of FIG. 1, FIG. 3 is a circuit configuration diagram of the alarm control circuit ALMC of FIG. Figure 4 shows a public telephone monitoring device S which is a second embodiment of the present invention.
FIG. 5 is a circuit diagram of the UPU, and FIG. 5 is a sequence chart showing the relay operation of the polarity reversal charge signal in the second embodiment of FIG. 4.

Claims (1)

[Scope of Claims] 1. A monitoring device SUPU between the public telephone TEL and the exchange EX, which presents a constant loop resistance R on the exchange side during normal times and stops presenting the loop resistance R when the number of stored coins reaches a certain threshold value. means for monitoring the loop circuit having the loop resistance value R in a public telephone equipment system in which the public telephone TEL and the monitoring device SUPU form a loop circuit during normal times; When the user of a public telephone TEL is making an outgoing call, the public telephone TEL
The monitoring device SUPU is provided with means for counting and accumulating the cumulative number of charging pulse signals corresponding to the called destination that are sent to the called destination, and when the cumulative number of charging pulse signals in the monitoring device SUPU reaches a certain threshold number, When the coin storage status of the public telephone TEL is approaching a certain storage amount, the first alarm is extracted, and the loop circuit disconnection is detected. A remote monitoring system for public telephones, characterized in that a second alarm indicating that the coin storage status of the public telephone TEL has reached a certain storage amount is extracted based on information from both the above alarm and the second alarm. 2. A monitoring device SUPU is provided between the public telephone TEL and the exchange EX, which presents a constant loop resistance R on the exchange side during normal times and stops presenting the loop resistance R when the number of stored coins reaches a certain threshold, and the public telephone In a public telephone equipment system in which a loop circuit is formed between the public telephone TEL and the monitoring device SUPU during normal times, there is provided a means for monitoring the loop circuit having the loop resistance R, and a means for monitoring the loop circuit having the loop resistance R; The monitoring device SUPU is provided with means for counting and accumulating the cumulative number of billing pulse signals corresponding to the called destination that are sent to the public telephone TEL during a call,
When the monitoring device SUPU detects the loop circuit disconnection before the cumulative number of billing pulse signals reaches a certain threshold number, it indicates that the public telephone TEL is in an abnormal state or that the telephone line is disconnected. A remote monitoring system for public telephones, characterized in that a third alarm is extracted.