JP2009212730A - Device, program and method for switching telephone network, and security system provided with device for switching telephone network - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for switching a telephone network, which can quickly perform switching from a public switched telephone network to a satellite telephone network when an alarm signal using the public switched telephone network cannot be transmitted when transmitting the alarm signal to an external alarm monitoring terminal, and to provide a program for switching a telephone network, a method for switching a telephone network, and a security system provided with the device for switching a telephone network. <P>SOLUTION: The means 1A of the device for switching a telephone network includes: a connection acceptance/rejection determining means 41 for determining the acceptance/rejection of connecting the public switched telephone network 13 on the basis of a voltage level; a connection request detecting means 42 for detecting the transmission of a connection request signal; a voltage polarity inversion determining means 43 for determining whether the polarity of voltage that occurs between itself and the public switched telephone network 13 is inverted; and a telephone network switching means 45 for switching connection to the satellite telephone network 14 when the connection acceptance/rejection determining means 41 determines that connection is impossible or when the voltage polarity inversion determining means 43 determines that the polarity of the voltage is not inverted. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an external alarm monitoring terminal for monitoring an operation using a public switched telephone network and a satellite telephone network for an alarm signal issued from an alarm signal transmission terminal when an abnormality occurs in operation monitoring of an elevator or an ATM device. The present invention relates to a telephone network switching device, a telephone network switching program, a telephone network switching method, and a security system provided with a telephone network switching device.

  Conventionally, in a remote monitoring system for monitoring abnormalities of elevators and ATM devices from a remote location, a remote monitoring system for transmitting an alarm signal to an external alarm monitoring terminal provided at a remote location using a telephone network, etc. Various proposals have been made.

  For example, in Japanese Patent Application Laid-Open No. 2007-122582, monitoring and measuring means for monitoring a state at a measuring point, connecting to a telephone number of a regional management office in charge using an external telephone line according to the monitoring situation, and A warning transmission means for automatically switching to a telephone number of another regional management center registered in advance when a connection cannot be made to a predetermined regional management office, and a router connecting the regional management office and the intranet And an alarm monitoring system comprising a receiving adapter for monitoring the status of the router and a central monitoring station connected to the intranet has been proposed (Patent Document 1). According to Patent Document 1, in the alarm monitoring system, the receiving adapter monitors a router abnormality, and if a router abnormality occurs, it cannot automatically connect an external telephone line to the regional management office in charge. By doing so, the alarm transmission means automatically switches to the telephone number of another regional general management office, so that the alarm signal can be reliably transmitted to the central monitoring station.

JP 2007-122582 A

  However, in the invention described in Patent Document 1, since only a general public switched telephone network is used for communication with the outside, it is vulnerable to disasters such as earthquakes and switch failures, and the public. When an abnormality occurs in the switched telephone network, there is a problem that communication with the outside cannot be performed. Also, disabling usable lines is inefficient for connection lines with a limited number, and it is necessary to increase the number of regional headquarters in order to reliably send warning signals. There is also a problem that the burden is high.

  The present invention has been made in order to solve such problems, and transmits an alarm signal issued by an alarm signal transmission terminal provided in a closed place such as an elevator or an ATM device to an external alarm monitoring terminal. Telephone network switching device and telephone network switching program capable of promptly switching the telephone network to be used from the public switched telephone network to the satellite telephone network when an alarm signal cannot be transmitted using the public switched telephone network during transmission An object of the present invention is to provide a telephone network switching method, and a security system including a telephone network switching device capable of unlocking an emergency equipment box in conjunction with the alarm signal transmitting terminal issuing an alarm signal. .

  The telephone network switching device and the telephone network switching program according to the present invention are characterized in that connection possibility determination means for determining whether connection with a public switched telephone network is possible based on a voltage level, and an alarm signal transmission terminal to an external alarm monitoring terminal Between the connection request detection means for detecting the transmission of a connection request signal issued to transmit an alarm signal to the public switching telephone network when the connection request detection means detects the connection request signal transmission. The voltage polarity reversal determining means for determining whether or not the polarity of the voltage being reversed has been determined, and the connection possibility determining means determines that the connection between the public switched telephone network is impossible, or the voltage A telephone network switching means for switching the connection to the satellite telephone network when the polarity reversal judging means determines that the polarity of the voltage generated with the public switched telephone network is not reversed; To the point that there is.

  Further, in the present invention, a voltage measuring unit for measuring a voltage generated between the public switched telephone network and a connection for storing a connectable voltage value necessary for establishing a connection with the public switched telephone network A connectable voltage value storage unit, and the connection possibility determination unit, when the voltage value measured by the voltage measurement unit drops below the connectable voltage value for a predetermined time or more, It is preferable to determine that the connection between the two is in a disabled state.

  Furthermore, in the present invention, when the alarm signal is unidirectionally transmitted to the external alarm monitoring terminal using a DTMF signal, the alarm signal transmission terminal is disconnected because the alarm signal is disconnected before transmission is completed. When the number of retransmissions of the alarm signal retransmitted from the device is measured and the number of retransmissions is determined to determine that the number of retransmissions exceeds a predetermined number, and when the number of retransmissions exceeds a predetermined number The telephone network switching means preferably switches the connection from the public switched telephone network to the satellite telephone network.

  Further, in the present invention, when transmitting an alarm signal to the external alarm monitoring terminal by modem communication, there is an answer back discriminating means for discriminating the presence or absence of an answer back with respect to the transmission of the alarm signal, When there is no answerback, the telephone network switching means preferably switches the connection from the public switched telephone network to the satellite telephone network.

  The security system comprising the telephone network switching device according to the present invention is characterized in that it is connected to an alarm signal transmission terminal, and is provided with an alarm detection means provided at a closed place such as an elevator, and at the closed place. And an automatic unlocking means connected to the locking mechanism of the emergency equipment box or the key box storing the key of the locking mechanism. The automatic unlocking means has an abnormality in the alarm detecting means. And a relay switch that is actuated by a voltage generated when detecting the lock and unlocks the locking mechanism.

  The telephone network switching method according to the present invention is characterized in that a connection possibility judgment step for judging whether or not connection to the public switched telephone network is possible based on a voltage level, and an alarm signal is transmitted from the alarm signal transmission terminal to the external alarm monitoring terminal. A connection request detection step for detecting the transmission of a connection request signal that is issued to detect the connection request signal, and the polarity of the voltage generated between the public switched telephone network and the connection request signal when the connection request signal transmission is detected by the connection request detection step. Voltage polarity reversal determination step for determining whether or not the connection has been reversed and the connection possibility determination step determines that connection with the public switched telephone network is impossible, or the voltage polarity reversal determination step A telephone network switching step for switching the connection to the satellite telephone network when it is determined that the polarity of the voltage generated between the telephone network and the public switched telephone network is not reversed; In that it has a certain.

  According to the present invention, an alarm signal using a public switched telephone network is transmitted when an alarm signal issued from an alarm signal transmission terminal provided in a closed place such as an elevator or an ATM device is transmitted to an external alarm monitoring terminal. If the transmission cannot be performed, the telephone network to be used can be switched to the satellite telephone network to ensure communication. In the security system, the emergency equipment box provided in a closed place such as an elevator can be unlocked in conjunction with the alarm signal transmission terminal issuing the alarm signal.

  Hereinafter, a first embodiment of a telephone network switching device, a telephone network switching program, and a security system using them according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram illustrating an example of a security system 10A including the telephone network switching device 1A according to the first embodiment. FIG. 2 is a block diagram showing the configuration of the telephone network switching device 1A and the telephone network switching program 1a according to the first embodiment.

  As shown in FIG. 1, the security system 10A according to the first embodiment includes a telephone network switching device 1A, an alarm detection means 11, an alarm signal transmission terminal 12, a public switched telephone network 13, a satellite telephone network 14, The external alarm monitoring terminal 15 and the automatic unlocking means 16 are comprised.

  The alarm detection means 11 is provided in the elevator 17 and is configured by a switch type alarm that is pressed by a user who wants to notify an abnormality or an automatic sensor type alarm that automatically detects according to the situation such as an earthquake or damage. When an abnormality is detected by these alarm devices, a signal indicating that an abnormality has occurred is transmitted to the alarm signal transmission terminal 12.

  The alarm signal transmission terminal 12 is generally known and commonly used, and is connected to the telephone network switching device 1A and receives an abnormality occurrence signal from the alarm detection means 11 to the external alarm monitoring terminal 15. A connection request signal for requesting the connection is transmitted, and an alarm signal is transmitted to the external alarm monitoring terminal 15 when the connection is established. In the first embodiment, the alarm signal issued from the alarm signal transmission terminal 12 is composed of a DTMF (Dial Tone Multi Frequency) signal.

  The public switched telephone network 13 is a telephone network used for fixed telephones. The telephone network switching device 1A and the external alarm monitoring terminal 15 are connected by a wired telephone line 18. The telephone line 18 has at least two lines, and a current of about 48 V is sent from the exchange to one line and is returned from the other line to the exchange via the telephone network switching device 1A. The The public switched telephone network 13 includes a digital telephone network such as ISDN (Integrated Services Digital Network).

  The satellite telephone network 14 is a telephone network used for a satellite telephone that directly communicates with the communication satellite 19, and is a telephone network that is independent from the public switched telephone network 13. The satellite telephone network 14 is wireless communication, has a wide communicable area, and enables stable communication.

  The external alarm monitoring terminal 15 in the first embodiment is a generally known one, and includes an alarm signal receiving unit 15a, an alarm display unit 15b, etc., and an alarm signal from the alarm signal transmitting terminal 12 The location of the elevator 17 where the abnormality has occurred and the content of the abnormality are displayed.

  Note that the telephone network switching device 1A and the external alarm monitoring terminal 15 in the first embodiment are connected to an antenna or the like necessary for connection to the satellite telephone network 14 (not shown).

  The telephone network switching device 1A and the telephone network switching program 1a according to the first embodiment perform switching by switching to the satellite telephone network 14 when an abnormality occurs in the public switched telephone network 13 and an alarm signal cannot be transmitted. Is for.

  The telephone network switching device 1A in which the telephone network switching program 1a according to the first embodiment is installed mainly stores the voltage value measuring device 2, the telephone network switching program 1a according to the first embodiment, various data, and the like. It is comprised from the means 3 and the arithmetic processing means 4 which controls each of these component means, acquires various data, and performs arithmetic processing.

  The voltage value measuring device 2 is provided between the alarm signal transmission terminal 12 and the public switched telephone network 13, and can measure a voltage level and a voltage polarity generated therebetween.

  The storage means 3 is composed of a data storage device such as a ROM, a RAM, or a hard disk drive, for example, and includes a program storage unit 31 for storing the telephone network switching program 1a and a connectable voltage value storage unit 32.

  Hereinafter, each component of the storage unit 3 will be described in more detail.

  The program storage unit 31 is installed with the telephone network switching program 1a of the first embodiment. Then, by being read and executed by the arithmetic processing means 4, the telephone network switching device 1A of the first embodiment is made to function and a telephone network switching method is realized.

  The connectable voltage value storage unit 32 stores connectable voltage values. Usually, a voltage level of about 48 V is maintained with the public switched telephone network 13. However, the voltage level may drop below a certain value due to disconnection or crosstalk of the telephone line 18 with the public switched telephone network 13 or failure of the telephone switch, and the connection state may become unstable. Therefore, in order to avoid communication failure due to the inability to connect, a voltage value necessary for stabilizing the connection with the public switched telephone network 13 is set as a connectable voltage value, and this is detected. It is supposed to be.

  Next, the arithmetic processing means 4 is composed of a CPU (Central Processing Unit) or the like, and by executing the telephone network switching program 1a installed in the program storage unit 31, a connection availability determination unit 41 and a connection request The computer functions as the detection unit 42, the voltage polarity inversion determination unit 43, the retransmission count determination unit 44, and the telephone network switching unit 45.

  Hereinafter, each component of the arithmetic processing means 4 will be described in more detail.

  The connectability determination unit 41 acquires the voltage level measured by the voltage value measuring device 2, reads out the connectable voltage value from the connectable voltage value storage unit 32, compares both voltage values, and sends the voltage level to the telephone network. This determines whether or not connection is possible. Specifically, when the voltage value measured by the voltage value measuring device 2 is higher than the connectable voltage value, it is determined that the connection between the telephone network switching device 1A and the public switched telephone network 13 is possible. It has become. On the other hand, when the voltage value measured by the voltage value measuring device 2 is lower than the connectable voltage value, it is determined that the connection between the telephone network switching device 1A and the public switched telephone network 13 is impossible. Yes. The connection determination unit 41 keeps functioning at all times, thereby monitoring the connection status with the public switched telephone network 13 and immediately switching to the satellite telephone network 14 if an abnormality occurs and It is prepared to notify the alarm monitoring terminal 15 and proceed with the repair work.

  The connection request detection unit 42 detects that the alarm signal transmission terminal 12 has transmitted a connection request signal. In the first embodiment, the transmission of the connection request signal is detected using the voltage value measured by the voltage value measuring device 2, but is not limited to this, and can be transmitted from the alarm signal transmission terminal 12. A signal notifying the transmission of the connection request signal to be transmitted may be received.

  The voltage polarity reversal determination unit 43 is activated when the connection request detection unit 42 detects the reception of the connection request signal, acquires the voltage value measured by the voltage measuring instrument 2, and whether or not the voltage polarity is reversed within a predetermined time. It has the function to discriminate.

  Polarity reversal means that when you receive a call, when the other party that you are calling picks up the handset, when you pick up the handset, when you pick up the handset, It means a state where the direction of current flowing through the telephone line 18 is sometimes reversed.

  The retransmission number determination unit 44 counts the number of transmissions n of the alarm signal transmitted from the alarm signal transmission terminal 12, and determines whether or not the number of retransmissions has reached a predetermined number or more, thereby obtaining the number of retransmissions. That is, when an alarm signal is transmitted to the external alarm monitoring terminal 15 via the public switched telephone network 13, if the communication is interrupted for some reason before the transmission is completed, for example, the other party disconnects without recognizing the alarm signal. In this case, the alarm signal transmission terminal 12 determines that the alarm signal has not been transmitted, and the alarm signal may be transmitted again. If transmission is not completed even if such retransmission is repeated, it is determined that there is some problem, and the telephone network switching unit 45 changes the connection destination from the public switched telephone network 13 to the satellite telephone network 14 as will be described later. The alarm signal is reliably transmitted by switching to.

  The telephone network switching unit 45 determines that the connection has not been established by the connection possibility determination unit 42, determines that the polarity has not been reversed within a predetermined time by the voltage polarity reversal determination unit 43, and determines the number of retransmissions. The unit 44 has a function of switching the connection from the public switched telephone network 13 to the satellite telephone network 14 when it is determined that the number of transmissions n has reached a predetermined number or more.

  In addition, the elevator 17 in which the first embodiment is used includes, for example, an emergency equipment box 21 and an emergency equipment box 21 in addition to the alarm detection means 11 and the automatic unlocking means 16 as shown in FIG. A key box 22 for storing a key is provided. Thus, when an emergency occurs and an abnormality occurrence signal is issued, the emergency equipment such as food and drink in the emergency equipment box 21 is simultaneously linked so that it can be used.

  Specifically, the automatic unlocking means 16 is constituted by a relay switch 16 a connected to the locking mechanism 22 a of the key box 22, and is connected to a lead wire 23 that connects the alarm detection means 11 and the alarm signal transmission terminal 12. ing. The switch is opened in response to the voltage generated by the transmission of the abnormality occurrence signal by the alarm detection means 12, and the key box 22 is automatically unlocked. The automatic unlocking means 16 directly connects the locking mechanism of the emergency equipment box 21 and the relay switch 16a without providing the key box 22 separately, and interlocks with the abnormality detection by the alarm detecting means 11 as described above. The emergency equipment box 21 may be unlocked automatically.

  The emergency equipment box 21 disposed in the elevator 17 stores goods that are useful when confined in the elevator 17. For example, portable radios, portable TVs, and rescues for knowing external information. There are whistles and loudspeakers to call, blankets and jackets for cold protection, emergency equipment and preserved food.

  Next, the telephone network switching method and the operation of the security system 10A including the telephone network switching device 1A, the telephone network switching program 1a, and the telephone network switching device in the first embodiment will be described with reference to the flowchart shown in FIG. .

  First, the connectability determination unit 41 always acquires the voltage level measured by the voltage value measuring device 2, compares this voltage level with the connectable voltage value acquired from the connectable voltage value storage unit 32, and It is determined whether or not a stable alarm signal can be transmitted by the public switched telephone network 13 (connection availability determination step: S1). If the voltage level is maintained at or above the connectable voltage value, the connectability determination unit 41 determines that the connection with the public switched telephone network 13 is possible and there is no abnormality (S1: YES). On the other hand, when the state where the voltage level is smaller than the connectable voltage value continues for a predetermined time or longer, the connectability determination unit 41 determines that the connection with the public switched telephone network 13 is impossible and there is an abnormality such as a failure ( (S1: NO), immediately switch to the satellite telephone network 14 to notify the external alarm monitoring terminal 15 of the abnormality (connection switching step: S8).

  Regardless of whether or not an alarm signal is thus issued, the connection status with the public switched telephone network 13 is always grasped, and when the connection is unstable, the satellite telephone network 14 is promptly switched to the external alarm monitoring terminal 15. Ensure communication with. In addition, when a communication line failure or an earthquake or the like occurs, it is possible to immediately notify the external alarm monitoring terminal 15 via the satellite telephone network 14 of the occurrence of failure or abnormality.

  Next, returning to the connectability determination step S1, a case where an abnormality has occurred in the elevator will be described.

  When the connection determination unit 41 in the connection determination step S1 determines that the connection to the public switched telephone network 13 is possible (S1: YES), an abnormality occurs in the elevator, and the abnormality is detected by an alarm detection means. When 11 is automatically detected or detected by being artificially pressed, the alarm detection means 11 transmits an abnormality occurrence signal, and the alarm signal transmission terminal 12 receiving the signal transmits a connection request signal to the external alarm monitoring terminal 15. Make a call (connection request step: S2). In this case, the connection request signal is transmitted to the external alarm monitoring terminal 15 via the public switched telephone network 13. With respect to this operation, the connection request detection unit 42 detects a state in which a connection request signal is transmitted based on the voltage value measured by the voltage value measuring device 2 (connection request detection step: S3).

  When the connection request detection unit 42 detects the transmission of the connection request signal, the voltage polarity determination unit 43 acquires the voltage polarity measured by the voltage measurement unit 2 and determines whether the polarity is reversed within a predetermined time. (Voltage polarity reversal discrimination step: S4).

  That is, when the external alarm monitoring terminal 15 raises the handset within a predetermined time and establishes a communication connection, the voltage polarity is reversed, so this is detected (S4: YES), and the connection of the office line is established. Judge. When the connection with the external alarm monitoring terminal 15 is established, an alarm signal is transmitted from the alarm signal transmission terminal 12 (alarm signal transmission step: S5).

  On the other hand, when it cannot be determined that the voltage polarity is reversed within a predetermined time (S4: NO), that is, when the communication connection cannot be established without raising the handset of the external alarm monitoring terminal 15, from the public switched telephone network 13 Switching to the satellite telephone network 14 (telephone network switching step: S8).

  When the alarm signal is unidirectionally transmitted using the DTMF signal as in the first embodiment, the communication situation such as when the communication speed is insufficient or only intermittent transmission is possible during the transmission of the alarm signal. Is unstable, the external alarm monitoring terminal 15 may end the connection during reception before the transmission of the alarm signal is completed. In this case, the alarm signal transmission terminal 12 retransmits the alarm signal because the transmission of the alarm signal is not completed.

  Therefore, the retransmission number determination unit 44 counts the transmission number n at which the same alarm signal is transmitted (transmission number counting step: S6), and determines whether or not the transmission number n is equal to or less than a predetermined number (transmission). Number determination step: S7). When the number of transmissions n is not more than a predetermined number, for example, 3 or less (S7: YES), it is determined that the transmission of the alarm signal has ended normally, the alarm signal transmission operation is terminated, and the normal voltage level monitoring is resumed ( Connection possibility determination step: S1).

  On the other hand, returning to the transmission number judgment step S7, when the number of times the alarm signal is retransmitted and the number of transmissions exceeds three (S7: NO), the telephone network switching unit 45 makes a satellite telephone call from the public switched telephone network 13. The connection is switched to the network 14 (telephone network switching step: S8). When the connection to the satellite telephone network 14 is switched, the alarm signal transmission terminal 12 transmits an alarm signal using the satellite telephone network 14, ends the alarm signal transmission work, and similarly performs normal voltage level monitoring. The process returns to (connection possibility determination step: S1).

  As a result, even if the communication connection cannot be established for some reason as a result of the unidirectional transmission of the alarm signal using the DTMF signal, the alarm signal is separately transmitted using the satellite telephone network 14 to notify the information of the abnormal situation. be able to.

  After the communication connection is switched to the satellite telephone network 14 by the telephone network switching unit 45, although not shown in the figure, similarly to the control for the public switched telephone network 13, the connection availability determination unit 41, the voltage polarity determination unit 43, and the number of retransmissions The determination unit 44 may determine the voltage level with the satellite telephone network 14, confirm the communication connection state based on the voltage polarity, and determine whether or not the transmission of the alarm signal is completed. If there is an abnormality in communication with the satellite telephone network 14, the telephone network to be used is switched from the satellite telephone to the original public switched telephone network 13. As a result, an alarm signal can be promptly transmitted when any of the telephone networks recovers normally.

  On the other hand, in the automatic unlocking means 16, when the alarm detection means 11 provided in the elevator 17 is activated, the relay switch 16a is activated by the voltage generated between the alarm detection means 11 and the alarm signal transmission terminal 12, and the key box 22 is activated. The locking mechanism 22a is unlocked. Then, the emergency equipment box 21 can be unlocked with the key in the key box 22, and the goods in the emergency equipment box 21 can be used.

According to the first embodiment as described above, the following effects can be obtained.
1. Since the public switched telephone network 13 is normally used, communication charges can be reduced.
2. It is possible to cope with various types of alarm signal transmission terminals 12, and in the case of an alarm transmission failure due to an abnormality of the public switched telephone network 13 while having a simple configuration, it is quickly switched to the satellite telephone network 14 to transmit the alarm. It is possible to increase the certainty and prompt prompt rescue.
3. If a problem occurs in the satellite telephone network 14, it is possible to switch to the public switched telephone network 13.
4). Completion of alarm signal transmission can be confirmed corresponding to the type of alarm signal.
5. Since the emergency equipment box 21 is unlocked only when an emergency occurs, it is possible to effectively prevent daily mischief and emergency response in an emergency.

  Next, a second embodiment of a telephone network switching device and a telephone network switching program according to the present invention will be described with reference to the drawings. FIG. 5 is a schematic configuration diagram illustrating an example of a security system 10B including the telephone switching device 1B according to the second embodiment. FIG. 6 is a block diagram showing the configurations of the telephone network switching device 1B and the telephone network switching program 1b according to the second embodiment. Note that, in the second embodiment, the same or corresponding components as those of the first embodiment described above are denoted by the same reference numerals and the description thereof is omitted.

  In the second embodiment, an example is shown in which a modem 23 is connected to the telephone network switching device 1B and the external alarm monitoring terminal 15 to enable bidirectional transmission / reception of alarm signals and the like. The external alarm monitoring terminal 15 in the second embodiment has a function of returning an answer back to the alarm signal transmission terminal 12 that has issued the alarm signal when reception of the alarm signal is completed.

  Note that the modem 23 in the second embodiment can transmit an alarm signal in packet units by communication using a B channel packet or a D channel packet using an ISDN line. Therefore, the influence on the change in communication speed is small, and transmission errors can be reduced. However, when the line is completely disconnected due to a telephone network failure or the like, or when a failure occurs in the external alarm monitoring terminal 15, the alarm signal is delayed between the modems 23 until transmission is completed or transmission is impossible. It may take a long time to be judged.

  Therefore, the telephone network switching device 1B according to the second embodiment determines whether or not there is an answer back transmitted from the external alarm monitoring terminal 15 in transmitting an alarm signal using the modem 23, whereby the public switched telephone network 13 The alarm signal is surely transmitted by determining the failure or the like and switching to the satellite telephone network 14.

  The telephone network switching device 1B equipped with the telephone network switching program 1b in the second embodiment mainly stores the voltage value measuring device 2, the telephone network switching program 1b in the second embodiment, various data, and the like. It is comprised from the means 3 and the arithmetic processing means 4 which controls each of these component means, acquires various data, and performs arithmetic processing.

  The arithmetic processing means 4 in the second embodiment is composed of a CPU and the like, and by executing the telephone network switching program 1b installed in the program storage unit 31, a connection availability determination unit 41 and a connection request detection unit. 42, a voltage polarity reversal determination unit 43, an answer back determination unit and 46, and a telephone network switching unit 45. In other words, the arithmetic processing unit 4 in the second embodiment causes the computer to function as the answer back determination unit 46 instead of the retransmission number determination unit 44 in the first embodiment.

  The answer back discriminating unit 46 discriminates whether or not there is an answer back from the external alarm monitoring terminal 15 within a predetermined time from the transmission of the alarm signal by the alarm signal transmitting terminal 12. The telephone network switching unit 45 immediately connects to the satellite telephone network 14 from the public switched telephone network 13 when the result of the determination by the answer back determination unit 46 is that the answer back is not received and the transmission of the alarm signal is not completed. Are to be switched.

  Next, the operation of the telephone network switching device 1B and the telephone network switching program 1b according to the second embodiment will be described using the flowchart shown in FIG. Note that, in the second embodiment, the same or equivalent operations as those of the first embodiment described above are denoted by the same reference numerals, and a duplicate description will be omitted as much as possible.

  The connectability determination unit 41 always determines whether or not a stable alarm signal can be transmitted by the public switched telephone network 13 (connection enable / disable determination step: S1), and detects a situation where connection is impossible. In some cases, the satellite telephone network 14 is immediately switched to notify the abnormality (connection switching step: S8). On the other hand, when the alarm detection means 11 detects an abnormality separately, a connection request signal is issued from the alarm signal transmission terminal 12 (connection request step: S2), and when this is detected by the connection request detection unit 42 (connection request detection step: S3), the voltage polarity discriminating unit 43 discriminates whether or not the polarity is inverted within a predetermined time (voltage polarity inversion discriminating step: S4). When the voltage polarity is reversed (S4: YES), the alarm signal transmission terminal 12 transmits an alarm signal to the external alarm monitoring terminal 15 (alarm signal transmission step: S5). On the other hand, if the voltage polarity does not reverse (S4: NO), it is determined that a communication connection with the public switched telephone network 13 cannot be established, and the connection is switched to the satellite telephone network 14 to establish the connection (telephone network switching step). : S8).

  Returning to the polarity inversion determination step S4, the communication connection with the public switched telephone network 13 can be established, and the alarm signal transmission terminal 12 transmits the alarm signal to the external alarm monitoring terminal 15 (alarm signal transmission step: S5). The back discriminating unit 46 discriminates whether or not an answer back from the external alarm monitoring terminal 15 has been received within a predetermined time from the transmission of the alarm signal (answer back discrimination step: S9). Then, when the answer back discriminating unit 46 receives an answer back from the external alarm monitoring terminal 15 within a predetermined time (S9: YES), it is judged that the transmission of the alarm signal has been normally completed and the transmission work is finished. Then, the process returns to the normal voltage level monitoring (connection possibility determination step: S1). On the other hand, when the answer back from the external alarm monitoring terminal 15 cannot be received within the predetermined time (S9: NO), it is determined that the transmission of the alarm signal by the public switched telephone network 13 cannot be completed, and the telephone network switching unit 45 performs the public switching. The communication connection is switched from the telephone network 13 to the satellite telephone network 14 (telephone network switching step: S8).

  According to the second embodiment as described above, in addition to the effects of the first embodiment described above, in the transmission of the alarm signal using the modem 23, the telephone network communication between the modems 23 and the external alarm monitoring terminal 15 are performed. When the transmission of the alarm signal cannot be completed, the alarm signal can be reliably transmitted by switching from the public switched telephone network 13 to the satellite telephone network 14 immediately. Also in the second embodiment, after switching to the satellite telephone network 14, it is possible to determine the stability of the voltage level of the satellite telephone network 14 itself and to determine the presence or absence of polarity reversal. It may be possible to switch back to the net.

  The telephone network switching device and the telephone network switching program according to the present invention are not limited to the above-described embodiments, and can be changed as appropriate.

  For example, when a DTMF signal is used as an alarm signal, the alarm signal transmission completion may be confirmed from the external alarm monitoring terminal 15 by answer-back.

  When a modem is used for alarm signal communication, a retransmission count determination unit 44 may be provided together with the answer back determination unit 46. In this case, when the answerback is not confirmed, the telephone network to be used may be switched after performing several retransmissions.

1 is a schematic configuration showing a first embodiment of a security system including a telephone network switching device according to the present invention. It is a block diagram which shows the telephone network switching apparatus and telephone network switching program of this 1st Embodiment. It is a block diagram which shows the security system provided with the telephone network switching apparatus of this 1st Embodiment. It is a flowchart figure which shows the telephone network switching process of this 1st Embodiment. It is a schematic structure which shows 2nd Embodiment of the security system provided with the telephone network switching apparatus which concerns on this invention. It is a block diagram which shows the telephone network switching apparatus and telephone network switching program of this 2nd Embodiment. It is a flowchart figure which shows the telephone network switching process of this 2nd Embodiment.

Explanation of symbols

1A, 1B Telephone network switching device 1a, 1b Telephone network switching program 10A, 10B Security system equipped with telephone network switching device 11 Alarm detection means 12 Alarm signal transmission terminal 13 Public switched telephone network 14 Satellite telephone network 15 External monitoring terminal 15a Alarm Signal receiving unit 15b Alarm display unit 16 Automatic unlocking means 17 Elevator 18 Telephone line 19 Communication satellite 21 Emergency equipment box 22 Key box 22a Locking mechanism 23 Modem 2 Voltage value measuring instrument 3 Storage means 31 Program storage section 32 Connectable voltage value storage Unit 4 Arithmetic processing means 41 Connection possibility determination unit 42 Connection request detection unit 43 Voltage polarity inversion determination unit 44 Retransmission count determination unit 45 Telephone network switching unit 46 Answer back determination unit

Claims (10)

A telephone network switching device that is selectively connectable to a public switched telephone network and a satellite telephone network, and is connected to an alarm signal transmission terminal that transmits an alarm signal,
A connection availability determination means for determining whether connection with the public switched telephone network is possible based on a voltage level;
A connection request detecting means for detecting the transmission of a connection request signal issued to transmit an alarm signal from the alarm signal transmitting terminal to an external alarm monitoring terminal;
Voltage polarity reversal determining means for determining whether or not the polarity of the voltage generated between the public switched telephone network is reversed when detecting the transmission of the connection request signal by the connection request detecting means;
When it is determined that the connection with the public switched telephone network is impossible by the connection possibility determining unit, or the polarity of the voltage generated between the public switched telephone network is determined by the voltage polarity inversion determining unit. A telephone network switching device, comprising: telephone network switching means for switching connection to the satellite telephone network when it is determined not to reverse. 2. The connectable storage device according to claim 1, wherein a voltage measuring unit that measures a voltage generated between the public switched telephone network and a connectable voltage value necessary for establishing a connection with the public switched telephone network are stored. A voltage value storage unit,
The connection possibility determination unit determines that the connection with the public switched telephone network is not possible when the voltage value measured by the voltage measurement unit drops below the connectable voltage value for a predetermined time or more. A telephone network switching device.   3. The alarm according to claim 1, wherein the alarm signal is transmitted unidirectionally using a DTMF signal to the external alarm monitoring terminal because the alarm signal is disconnected before transmission of the alarm signal is completed. A retransmission number determining means for measuring the number of retransmissions of the alarm signal retransmitted from the signal transmission terminal and determining that the number of retransmissions is equal to or greater than a predetermined number; When this happens, the telephone network switching means switches the connection from the public switched telephone network to the satellite telephone network.   In Claim 1 or Claim 2, when an alarm signal is transmitted to the external alarm monitoring terminal by modem communication, there is an answer back discriminating means for discriminating whether or not there is an answer back for the transmission of the alarm signal. A telephone network switching device, wherein when there is no answerback, the telephone network switching means switches the connection from the public switched telephone network to the satellite telephone network. A security system comprising the telephone network switching device according to any one of claims 1 to 4,
Alarm detection means connected to the alarm signal transmission terminal and deployed in a closed place such as an elevator,
Automatic unlocking means connected to the locking mechanism of the emergency equipment box deployed in the closed place or the locking mechanism of the key box storing the key of this locking mechanism,
The automatic unlocking means is operated by a voltage generated when the alarm detecting means detects an abnormality, and has a relay switch for unlocking the locking mechanism, and has a telephone network switching device. system. A telephone network switching program capable of selectively connecting to a public switched telephone network and a satellite telephone network and causing a computer to function as a telephone network switching device connected to an alarm signal transmission terminal for transmitting an alarm signal. ,
A connection availability determination means for determining whether connection with the public switched telephone network is possible based on a voltage level;
A connection request detecting means for detecting the transmission of a connection request signal issued to transmit an alarm signal from the alarm signal transmitting terminal to an external alarm monitoring terminal;
Voltage polarity reversal determining means for determining whether or not the polarity of the voltage generated between the public switched telephone network is reversed when detecting the transmission of the connection request signal by the connection request detecting means;
When it is determined that the connection with the public switched telephone network is impossible by the connection possibility determining unit, or the polarity of the voltage generated between the public switched telephone network is determined by the voltage polarity inversion determining unit. A telephone network switching program for causing a computer to function as a telephone network switching means for switching a connection to the satellite telephone network when it is determined not to reverse. 7. The connectable device according to claim 6, wherein a voltage measuring unit for measuring a voltage generated between the public switched telephone network and a connectable voltage value necessary for establishing a connection with the public switched telephone network are stored. A voltage value storage unit,
The connection possibility determination unit determines that the connection with the public switched telephone network is not possible when the voltage value measured by the voltage measurement unit drops below the connectable voltage value for a predetermined time or more. A telephone network switching program.   8. The alarm according to claim 6 or 7, wherein the alarm signal is unidirectionally transmitted to the external alarm monitoring terminal using a DTMF signal, and the alarm is disconnected because transmission of the alarm signal is completed. A retransmission number determining means for measuring the number of retransmissions of the alarm signal retransmitted from the signal transmission terminal and determining that the number of retransmissions is equal to or greater than a predetermined number; When this happens, the telephone network switching means switches the connection from the public switched telephone network to the satellite telephone network.   8. The method according to claim 6, further comprising: an answer back discriminating means for discriminating whether or not there is an answer back with respect to the transmission of the alarm signal when the alarm signal is transmitted to the external alarm monitoring terminal by modem communication. And a telephone network switching program for switching the connection from the public switched telephone network to the satellite telephone network when there is no answerback. A telephone network switching method in a telephone network switching device that is selectively connectable to a public switched telephone network and a satellite telephone network and is connected to an alarm signal transmission terminal that transmits an alarm signal,
A connectability determination step of determining whether to connect to the public switched telephone network based on a voltage level;
A connection request detection step for detecting the transmission of a connection request signal issued to transmit an alarm signal from the alarm signal transmission terminal to an external alarm monitoring terminal;
Voltage polarity reversal determination step for determining whether or not the polarity of the voltage generated between the public switched telephone network is reversed when detecting the transmission of the connection request signal by this connection request detection step;
When it is determined that the connection with the public switched telephone network is impossible by the connection possibility determining step, or the polarity of the voltage generated with the public switched telephone network is determined by the voltage polarity inversion determining step. A telephone network switching method, comprising: a telephone network switching step of switching a connection to the satellite telephone network when it is determined not to reverse.

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