JP4178914B2 - Line terminal equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a line terminal device, and more particularly to a line terminal device that collects information of a data terminal device such as a home security panel or a gas shut-off device by no-ringing communication or ringing communication using a public line network.
[0002]
[Prior art]
Conventionally, this type of line terminal device is a device that collects information of the data terminal device 2 by the central monitoring device 5 via the public line 3 and the exchange 4 as shown in FIG. Here, the data terminal device 2 is a device with a communication function built in a microcomputer, and is built in a gas meter attached to a gas consumer's house, so that the use state of the gas can be read out by a telegram. Reference numeral 8 denotes a terminal interface unit which transmits / receives a message to / from the data terminal device 2. A central control unit 9 analyzes a message received by the line terminal device 1 and performs overall control. The telephone 6 at the gas customer's house is connected to the public line 3 via the line terminal device 1.
[0003]
The polarity reversal detection unit 10 reverses the line voltage of the public line 3 in order to prevent malfunctions due to the line voltage change caused by the off-hook or on-hook of the telephone 6, the dial pulse transmission of the telephone 6, or the polarity of the telephone ringing signal at 16HZ. After completion, the detection state is output with a further delay. For this reason, when polarity reversal occurs for the first time when ringing arrives, the ringing detection unit 16 instantaneously enters a ringing signal detection state, but the polarity reversal detection unit 10 is configured to output polarity reversal later than that.
[0004]
Next, the communication operation of the line terminal device 1 will be described with reference to FIG. First, when ringing communication is performed, the number of occurrences of the 16HZ ringing signal is set in advance as a condition for ringing incoming response to the incoming call setting number unit 7. The ringing communication is started by the transmission from the central monitoring device 5, and in the exchange 4 that receives the transmission, the polarity of the public line 3 to which the line terminal device 1 is connected is 16 Hz for 1 second in a cycle of 3 seconds following the polarity reversal. A ringing call signal on which a ringing signal is superimposed is transmitted. The telephone set 6 is ringed by the 16HZ ringing signal.
[0005]
A signal waveform diagram when the polarity inversion and ringing call signal arrive at that time is shown in FIG. The ringing detection unit 16 outputs the ringing signal detection state for a moment by inversion of the line voltage at the time of the first polarity inversion, and thereafter outputs the ringing signal detection state while the 16 Hz ringing signal arrives. On the other hand, the output of the polarity inversion detection unit 10 is output with a delay from the line voltage inversion of the public line 3.
[0006]
In such a line terminal device 1, when no ringing communication is performed in a state where the ringing incoming call determination unit 17 is configured to be able to receive ringing incoming calls, if polarity reversal from the switching center 4 occurs, the polarity reversal detection unit 10 Since the output of the ringing detection unit 16 outputs a signal earlier than the output, the central control unit 9 preferentially performs the determination operation in the ringing arrival determination unit 17. Then, when polarity reversal occurs at the time of no ringing incoming, the ringing incoming determination unit 17 performs ringing incoming condition determination for a certain period of time (corresponding to a ringing call signal pause time of 2 seconds). Since the switching center 4 finishes sending the no-ringing call signal for 2 seconds during which the ringing incoming call determination is performed, the central control unit 9 cannot make the NR incoming call determination unit 12 determine the no-ringing incoming call.
[0007]
Therefore, in order to enable no ringing communication, the incoming call count setting unit 7 must be set so as not to receive ringing. In order to solve this problem, another line terminal device as shown in FIG. 6 has been devised (see Patent Document 1).
[0008]
Reference numeral 19 denotes a ringing signal output permission unit. After the polarity reversal detection unit 10 detects polarity reversal, the NR incoming call detection unit 12 determines that the NR incoming call detection unit 11 detects no ringing call signal including the terminal itself and other than the terminal itself. Only in the case, the signal from the ringing detection unit 16 is transmitted to the ringing incoming call determination unit 17 until the ringing incoming call determination is completed under the control of the central control unit 20.
[0009]
Subsequently, the operation of the line terminal device 21 will be described. Assume that ringing incoming call response conditions are set in advance in the incoming call count setting unit 7. First, ringing communication will be described. When ringing communication is started by transmission from the central monitoring device 5, the output of the ringing detection unit 16 of the line terminal device 21 is as shown in FIG. . However, when this polarity reversal occurs, the ringing signal output permission unit 19 does not transmit the output of the ringing detection unit 16 to the ringing incoming call determination unit 17, and the central control unit 20 does not wait for the ringing incoming call determination, so that the delay Then, the polarity inversion detection unit 10 outputs the polarity inversion detection process. The central control unit 20 that has detected the polarity reversal keeps the network control unit 14 in a high impedance state so that the NRS selection signal, which is a ringing call signal from the switching center 4, can be detected by the NR incoming detection unit 11. Enter the decision. Since the NR incoming call detection unit 11 does not detect a no ringing call signal, the NR incoming call determination unit 12 determines that no ringing call signal is not detected after 0.35 seconds and informs the central control unit 20 of the result. Upon receiving the determination result, the central control unit 20 ends the no-ringing incoming call determination.
[0010]
Thereafter, the central control unit 20 sets the ringing signal output permission unit 19 to transmit the signal from the ringing detection unit 16 to the ringing incoming call determination unit 17 until the ringing incoming call determination is completed. Accordingly, when the ringing detection unit 16 detects the 16HZ ringing signal transmitted from the exchange 4 following the polarity inversion, the ringing incoming call determination unit 17 counts up the number of incoming calls and is set by the incoming call number setting unit 7. It can be determined whether or not an incoming call response condition has been reached.
[0011]
Next, the operation at the time of no-ringing communication in a state where the same incoming call response conditions as those at the time of ringing communication are set in the incoming call setting number section 7 will be described. When no-ringing communication is started by transmission from the central monitoring device 5, polarity inversion occurs in the line terminal device 21. Due to this polarity inversion, the ringing detection unit 16 of the line terminal device 21 enters a ringing signal detection state for a moment, but the ringing signal output permission unit 19 does not transmit the signal from the ringing detection unit 16 to the ringing arrival determination unit 17. Therefore, the central control unit 20 can detect the output of the polarity inversion detection unit 10 that is delayed from the output of the ringing detection unit 16 without waiting for the determination result of the ringing arrival.
[0012]
Accordingly, the central control unit 20 can immediately detect the output of the polarity reversal detection unit 10 and the network control unit so that the NR incoming detection unit 11 can detect the NRS selection signal which is a ringing call signal from the switching center 4. 14 is left in a high impedance state and monitoring is started. When the no ringing call signal transmitted from the switching center 4 is detected by the NR incoming call detection unit 11, the NR incoming call determination unit 12 determines whether or not it matches the preset local terminal call signal data, and the result is obtained. Inform the central controller 20. If it matches the call signal data of its own terminal, the central control unit 20 sets the network control unit 14 in a semi-closed state, forms a DC loop with the public line 3 and the switching center 4, and indicates that it has responded to the no-ring incoming call. Communication is started by sending a DTMF signal # from the unit 13 to the exchange 4 for notification.
[0013]
[Patent Document 1]
JP 2002-125060 A
[0014]
[Problems to be solved by the invention]
However, in the configuration as described above, the ringing signal output permission unit 19 determines that the no ringing call signal is detected by the NR incoming detection unit 11 after the polarity inversion detection unit 10 detects the polarity inversion detection. Otherwise, the signal from the ringing detection unit 16 is not transmitted to the ringing arrival determination unit 17 under the control of the central control unit 20. In other words, ringing could not be received unless polarity reversal occurred.
[0015]
Therefore, if the line to which the line terminal device is connected is an analog public line, there will be no problem because polarity reversal always occurs before the call is made, but in the case of an ISDN line, it is connected to the analog port of the installed terminal adapter. Therefore, there is a problem that ringing cannot be received when connected to a terminal adapter that does not cause polarity reversal.
[0016]
[Means for Solving the Problems]
In order to solve the above-described conventional problem, the line terminal apparatus of the present invention is not affected by the ringing incoming call determination unit by the output of the polarity inversion detection unit, the output of the NR incoming call detection unit, or the determination by the NR incoming call determination unit. In addition, the ringing signal of the ringing call signal detected by the ringing detection unit is monitored, and compared with the incoming call condition setting unit, it is determined in parallel whether the setting condition is satisfied.
[0017]
As a result, even if the ringing signal is generated for the first time when a ringing signal arrives, this signal is detected by the ringing detection unit, even if the ringing signal is generated without polarity reversal occurring at the start of the ringing. Can start the determination. At this time, since polarity inversion does not occur, the NR incoming call determination unit does not enter the monitoring state.
[0018]
In addition, when connected to a line where polarity reversal occurs at the start of ringing, when polarity reversal occurs at the time of ringing arrival, this polarity reversal signal is first detected by the ringing detection unit, and the ringing arrival determination unit starts determination. . Since the polarity reversal detection unit also detects polarity reversal, the NR incoming call determination unit enters the monitoring state with a delay, but no ringing call signal is received, so it is determined that no ringing call reception is not established, but a ringing signal is generated, so ringing occurs. The incoming call determination is continued, and if the condition is satisfied, the processing shifts to ringing communication processing.
[0019]
On the other hand, at the time of no-ringing incoming, a slow polarity inversion occurs first, but the ringing detection unit temporarily outputs a detection signal in synchronization with the line voltage inversion earlier than the output of the polarity inversion detection unit. For this reason, the ringing incoming call determination unit first performs the ringing incoming call determination by detecting the ringing signal. After that, when a polarity reversal detection signal is input from the polarity reversal detection unit to the NR incoming call determination unit with a delay, the NR incoming call determination unit also starts the determination in parallel. When a no-ringing paging signal arrives after gradual polarity reversal, the NR incoming call determination unit establishes no-ringing incoming call determination, and the ringing incoming call determination unit fails to establish ringing incoming call determination. Therefore, the line terminal apparatus can shift to processing of no ringing communication. . Therefore, without changing the setting of the line terminal device, ringing can be received even if a line where polarity inversion does not occur or connected to a line where polarity inversion occurs, and no ringing can be received in a setting state where ringing can be received. .
[0020]
DETAILED DESCRIPTION OF THE INVENTION
  According to the first aspect of the present invention, a polarity inversion detecting unit that detects and reverses the polarity inversion of the line and outputs the signal, and an NR incoming signal that detects a no ringing call signal transmitted from the line when the polarity inversion detecting unit detects the polarity inversion. A detection unit, an NR incoming call determination unit that determines whether the no-ringing call signal detected by the NR incoming call detection unit is a call signal of the own terminal, and an incoming call response to the line when the NR incoming call determination unit determines that the call signal of the own terminal An NR incoming response unit that returns a signal, a ringing detection unit that detects a 16 Hz ringing signal of the ringing ringing signal transmitted from the line, and the number of times and time of the 16 Hz ringing signal of the ringing ringing signal are set as response conditions at the time of ringing incoming The incoming call condition setting section,The ringing signal ringing signal detected by the ringing detection unit is monitored, and the ringing signal ringing signal detected by the ringing detection unit is valid when the setting condition is satisfied in comparison with the incoming condition setting unit. If not established, the ringing call signal detected by the ringing detection unit is invalidated.Ringing incoming call determination unit and ringing incoming call response unit that sends an incoming response signal to the line side when it is determined that the setting condition is satisfied by the ringing incoming call determination unitThe ringing incoming call determination unit ends the ringing incoming call determination process after confirming that the ringing signal does not come within a predetermined time after the ringing signal is stopped.ByThus, the end of the call can be determined with certainty, and if there is a call that does not match the ringing reception condition, it is possible to wait until this call is finished and to start the incoming call determination from a newly started call.
[0028]
  Claim 2In the invention described in, the output delay time of the polarity reversal detection unit and the no-ringing arrival determination timeTotal timeIf the polarity inversion occurs, no polarity ringing is detected by the polarity inversion detecting unit when the polarity inversion occurs by providing a delay output unit that outputs the determination result of the ringing arrival determining unit with a delay. Since the ringing incoming call can be determined after the incoming call judgment is performed first, no ringing communication is made when the incoming call condition setting part is set to the setting that the ringing incoming call is established immediately when the ringing call is detected. Even if ringing incoming call determination may be established due to slow polarity reversal at the time, no ringing incoming call processing can be performed without entering ringing communication, and transition to no ringing communication can be made.
[0029]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0030]
Example 1
FIG. 1 is a block diagram of a line terminal apparatus according to Embodiment 1 of the present invention. In addition, the thing of the same number as FIG. 4, FIG. 6 is a component which has the same name and the same function, The description is abbreviate | omitted. In the figure, reference numeral 27 denotes an incoming condition setting unit which sets a condition for supplementing a line and is compared with the detection state from the ringing detection unit 16. This setting condition can be set as the number of 16HZ ringing signals, the time interval between calls, the number of calls, and the like. Reference numeral 37 denotes a ringing incoming call determination unit which is not affected by the output of the polarity reversal detection unit 10, the output of the NR incoming call detection unit 11, or the determination by the NR incoming call determination unit 12, and is detected by the ringing detection unit 16. The 16-Hz ringing signal of the signal is monitored, and compared with the incoming condition setting unit 27, it can be determined in parallel with the determination of the NR incoming call whether the setting condition is satisfied.
[0031]
Conversely, the polarity reversal detection unit 10, the NR incoming call detection unit 11, and the NR incoming call determination unit 12 are not affected by the output of the ringing detection unit 16 or the determination of the ringing incoming call determination unit 37, and the polarity reversal or no ringing call signal is received. And whether or not the terminal is calling can be determined in parallel with the determination of the incoming ringing.
[0032]
Next, the operation and action of the line terminal device 41 configured as described above will be described below. It is assumed that the incoming call condition setting unit 27 of the line terminal device 41 has previously set the number of 16HZ ringing signals as the incoming call response number as a ringing incoming call response condition. First, the ringing communication will be described. The ringing communication is started by the transmission from the central monitoring device 5, and in the exchange 4 that receives the transmission, following the polarity inversion to the public line 3 to which the line terminal device 41 is connected. A ringing call signal in which a telephone ringing signal of 16 Hz is superimposed for 1 second is transmitted at a cycle of 3 seconds. The telephone 6 rings with this ringing signal.
[0033]
At this time, as shown in FIG. 5 as in the conventional example, the output of the ringing detection unit 16 of the line terminal device 41 outputs the ringing signal detection state for a moment due to the inversion of the line voltage at the time of the first polarity inversion, and thereafter the 16 Hz The ringing undetected state is output until a ringing signal is generated. Next, since the switching station 4 generates a ringing signal of 16 Hz within 2 seconds from the polarity reversal, the ringing detection unit 16 outputs a ringing signal detection state while the voltage is repeatedly reversed at a cycle of 16 Hz.
[0034]
Then, while the ringing incoming call determination unit 37 performs the ringing incoming call determination, the NR incoming call determination unit 12 starts the determination process by the polarity reversal detection signal from the polarity reversal detection unit 10. The NR incoming call determination unit 12 that has detected the polarity reversal sets the network control unit 14 in a high impedance state so that the NR incoming call detection unit 11 can detect the NRS selection signal, which is a no-ringing call signal from the switching center 4, so that no ringing incoming call is received. Make a decision. However, since only the ringing call signal is transmitted from the switching center 4, the NR incoming call determination unit 12 determines that no ringing call signal is not detected after 0.35 seconds, and ends the monitoring of the no ringing incoming call.
[0035]
On the other hand, when the ringing detection unit 16 detects the 16 Hz ringing signal transmitted from the exchange 4 following the polarity reversal, the ringing detection unit 37 increments the number of incoming calls and is set by the number of incoming calls setting unit 27. It is determined whether the incoming call response condition has been reached.
[0036]
When the ringing incoming call determination unit 37 reaches the incoming call response condition of the incoming call count setting unit 27, the central control unit 30 closes the network control unit 14 to form a DC loop with the public line 3 and the switching center 4 to connect the line. To capture.
[0037]
When the line is acquired, the exchange 4 stops sending the ringing signal and notifies the central monitoring device 5 that the line has been connected.
[0038]
The ringing incoming call response unit 18 transmits an incoming call response signal to the central monitoring device 5 via the exchange 4 in order to notify the caller (in this case, the central monitoring device 5) that the line terminal device 41 has captured the line. .
[0039]
The central monitoring device 5 that has confirmed the incoming call transmits a telegram in the form of a modem signal to the line terminal device 41 via the public line 3 and the exchange 4.
[0040]
This message is demodulated by the transmission / reception unit 15 of the line terminal device 41 and received by the central control unit 30.
[0041]
If the received message is a message to the line terminal device 41 itself, the central control unit 30 creates a response message, modulates it by the transmission / reception unit 15 and transmits it to the central monitoring device 5 in the form of a modem signal.
[0042]
When the received message is a message to the data terminal device 2, the central control unit 30 converts the message into a format suitable for the data terminal device 2 and transmits it via the terminal interface unit 8.
[0043]
When the central control unit 30 receives a response message from the data terminal device 2 via the terminal interface unit 8, it is converted into a message in a format suitable for the central monitoring device 5, modulated by the transmission / reception unit 15, and sent to the central monitoring device 5. Send.
[0044]
Thereafter, transmission / reception of messages is repeated between the central monitoring device 5, the line terminal device 41, and the data terminal device 2. When ending communication, the central monitoring device 5 transmits a communication end message to the line terminal device 41.
[0045]
Upon receiving this communication end message, the central control unit 30 transmits a communication end response message to the central monitoring device 5, and then the network control unit 14 opens the DC loop, disconnects the line to the switching center 4 and ends the communication. To do.
[0046]
Next, the operation at the time of no ringing communication will be described. In order to be able to operate in both no-ringing communication and ringing communication, the incoming call setting number unit 27 of the line terminal device 41 is in a state in which the same incoming call response conditions as in the ringing communication are set.
[0047]
In this state, when no-ringing communication is started by a call from the central monitoring device 5, the exchange 4 that has received the call starts up the line terminal device 41 by reversing the polarity of the public line 3 to which the line terminal device 41 is connected. multiply.
[0048]
Due to this polarity inversion, the ringing detection unit 16 of the line terminal device 41 enters a ringing signal detection state for a moment, so that the ringing arrival determination unit 37 enters the monitoring of the ringing arrival and subsequently the polarity inversion delayed from the output of the ringing detection unit 16 The NR incoming call determination unit 12 that has detected the output of the detection unit 10 starts monitoring for no ringing incoming calls.
[0049]
Subsequently, the switching center 4 transmits a no-ringing call signal following polarity inversion. When the network control unit 14 is in a high impedance state and this no ringing call signal is detected by the NR incoming call detection unit 11, the NR incoming call determination unit 12 determines whether or not it matches the preset local terminal call signal data. If they match, the central control unit 30 is notified of the result.
[0050]
If it matches the call signal data of its own terminal, the central control unit 30 sets the network control unit 14 in a semi-closed state to form a DC loop with the public line 3 and the switching center 4, and the NR incoming call response unit 13 responds to the no ringing incoming call. This is notified to the exchange 4 by sending # of the DTMF signal.
[0051]
When receiving the incoming response signal (DTMF signal #), the switching center 4 informs the central monitoring device 5 that the line terminal device 41 has been connected.
[0052]
The central monitoring device 5 that has confirmed the connection transmits a telegram in the form of a modem signal to the line terminal device 41 or the data terminal device 2 via the public line 3 and the exchange 4. This message is demodulated by the transmission / reception unit 15 of the line terminal device 41 and received by the central control unit 30. If the received message is a message to the line terminal device 41 itself, the central control unit 30 creates a response message, modulates it by the transmission / reception unit 15 and transmits it to the central monitoring device 5 in the form of a modem signal.
[0053]
When the received message is a message to the data terminal device 2, the central control unit 30 converts the message into a format suitable for the data terminal device 2 and transmits it via the terminal interface unit 8.
[0054]
When the central control unit 30 receives a response message from the data terminal device 2 via the terminal interface unit 8, it is converted into a message in a format suitable for the central monitoring device 5, modulated by the transmission / reception unit 15, and sent to the central monitoring device 5. Send.
[0055]
Thereafter, like the ringing communication, transmission / reception of a message is repeated between the central monitoring device 5, the line terminal device 41, and the data terminal device 2, and the communication is terminated.
[0056]
Therefore, when performing no-ringing communication with respect to the line terminal device 41 operated by ringing communication, it is not necessary to change the setting of the incoming call count setting unit 27 to a state in which no ringing incoming call is received.
[0057]
On the contrary, when the operation of the line terminal device 41 that has been operated by no-ringing communication is changed to ringing communication, it is not necessary to perform the setting of the incoming call count setting unit 27 again. In other words, both communications can be performed with a setting that allows both ringing incoming calls and no ringing incoming calls.
[0058]
So far, the public line 3 has been described as an analog public line, but when the public line is an ISDN line 43 as shown in FIG. 2, the line terminal device 41 is connected via a terminal adapter 44 with a built-in DSU. The terminal adapter 44 will be described below as a model having an analog port that does not cause polarity reversal. Note that no ringing service is supported on the ISDN line 43, so only ringing communication is performed.
[0059]
First, ringing communication is started by a call from the central monitoring device 5, and the exchange 4 that has received the call calls the line to which the line terminal device 41 is connected. The terminal adapter 44 that has received this call information transmits a ringing call signal in which a telephone ringing signal of 16 Hz is superimposed for 1 second at a cycle of 3 seconds. The telephone 6 rings with this ringing signal.
[0060]
At this time, the ringing detection unit 16 of the line terminal device 41 outputs a ringing non-detection state until a 16 Hz ringing signal is generated. When a 16 Hz ringing signal is generated, a ringing signal detection state signal is output.
[0061]
On the other hand, since the polarity reversal detection signal is not detected in the polarity reversal detection unit 10, the NR incoming determination unit 12 does not perform the determination process. When the ringing detection unit 16 detects the 16 Hz ringing signal transmitted from the terminal adapter 44, the ringing incoming call determination unit 37 counts up the number of incoming calls and sets the incoming call response condition set in the incoming call number setting unit 27. Determine if it has been reached.
[0062]
When the ringing incoming call determination unit 37 reaches the incoming call response condition of the incoming call count setting unit 27, the central control unit 30 closes the network control unit 14 to form a DC loop with the terminal adapter 44 to capture the line. When the line is acquired, the terminal adapter 44 notifies the exchange 4 and stops sending the ringing signal.
[0063]
Upon receiving the notification, the exchange 4 notifies the central monitoring device 5 that the line has been connected. The ringing incoming call response unit 18 informs the caller (in this case, the central monitoring device 5) that the line terminal device 41 has acquired the line, so that the central monitoring device 5 passes through the terminal adapter 44, the ISDN line 43, and the switching center 4. An incoming call response signal is transmitted to.
[0064]
The central monitoring device 5 that has confirmed the incoming call transmits a message in the form of a modem signal to the line terminal device 41 via the switching center 4, the ISDN line 43, and the terminal adapter 44. This message is demodulated by the transmission / reception unit 15 of the line terminal device 41 and received by the central control unit 30. Thereafter, communication is performed in the same manner.
[0065]
At the end of communication, the central control unit 30 that has received the communication end message transmits a communication end response message to the central monitoring device 5, and then the network control unit 14 opens the DC loop and disconnects the line to the terminal adapter 44. Communication will be terminated.
[0066]
In this way, even if the customer's public line is not an analog line but an ISDN line and polarity inversion does not occur, or even if it is connected between PBX and a special communication adapter, polarity inversion cannot be detected. The device 41 is capable of ringing incoming in a setting state in which no ringing incoming is possible.
[0067]
Further, even when this line terminal device 41 is removed and connected to a customer house on another analog line, or when the customer switches the line contract from an ISDN line to an analog line, the setting of the line terminal apparatus 41 is not particularly changed. It can be connected to the line as it is, and no ringing communication or ringing communication is possible.
[0068]
Further, the ringing incoming call determination unit 37 according to the present embodiment invalidates a 16 Hz ringing signal generated within a predetermined time, for example, within 1 second from the end of communication. Then, at the end of the ringing communication, when the network control unit 14 changes from the closed state to the open state, the line voltage is reversed and recovered in less than one second. In response to the change in the line voltage, the ringing detector 16 temporarily outputs an output signal.
[0069]
However, since the ringing incoming call determination unit 37 invalidates this signal, it is possible to prevent the meaningless ringing incoming call determination from starting due to a change in the line voltage immediately after communication.
[0070]
Further, when the ringing incoming call determination unit 37 of the present embodiment confirms that the 16 Hz ringing signal does not come for a predetermined time from the stop of the 16 Hz ringing signal and ends the ringing incoming call determination process, the ringing incoming call determination unit 27 is called. When the interval is set as a condition, even after an incoming call occurs and it is determined that the call interval does not match the condition, it is possible to wait until this call is finished, and the incoming call determination can be started again from a newly started call. Can prevent malfunction.
[0071]
If the ringing detection unit 37 of the present embodiment disables the signal of the ringing detection unit that does not satisfy the predetermined condition, the ringing detection that is temporarily output by the gentle polarity reversal at the time of the no-ringing reception is performed. If the condition is set so that the signal width of the part becomes invalid, the output from the ringing detection part that occurs due to slow polarity inversion at the time of no ringing incoming can be invalidated, and unnecessary ringing incoming judgment operation is performed in parallel This can be prevented.
[0072]
Therefore, when commercializing, control components such as a microcomputer having a high processing capability can be mounted, and an inexpensive device can be provided. In addition, it is possible to prevent an operation state that does not require communication, and each detection circuit and determination circuit are not activated. Therefore, a low power consumption design is possible, and the power supply of the line terminal device is small when the battery is used. A space-saving and inexpensive device equipped with a battery can be provided.
[0073]
(Example 2)
FIG. 3 is a block diagram of a line terminal apparatus according to the second embodiment of the present invention. In FIG. 3, reference numeral 38 denotes a delay output unit that delays the determination output of the ringing arrival determination unit 37 further than the total time of the output delay time of the polarity reversal detection unit 10 and the no-ringing call signal maximum waiting time of the NR arrival determination unit 12. The determination result of the satisfaction of the condition is output. Here, the time from the occurrence of polarity reversal until the determination by the ringing arrival determination unit 37 after the polarity reversal detection of the polarity reversal detection unit 10 is completed is 0.4 seconds, and the delay output unit 38 of the ringing arrival determination unit 37 The judgment output is outputted with a delay of 0.5 seconds.
[0074]
The operation and action of the line terminal device 42 configured as described above will be described below. It is assumed that the incoming call condition setting unit 27 of the line terminal device 42 is set to immediately enter communication upon detection of a ringing call signal.
[0075]
First, in the case of a no-ringing incoming call, as soon as a detection signal is temporarily output from the ringing detection unit 16 to the ringing incoming call determination unit 37 at the time of slow polarity reversal at the time of the no-ringing incoming call, the ringing incoming call determination unit 37 matches the ringing incoming call condition. Obtain the judgment result.
[0076]
However, the delay output unit 38 does not immediately transmit the determination result to the ringing incoming call response unit 18 or the central control unit 40 and waits for 0.5 seconds. On the other hand, from the occurrence of polarity reversal, the NR incoming call determination unit 12 gives a determination result of no ringing incoming call within 0.4 seconds.
[0077]
In response to this, the NR incoming call response unit 13 sends a response signal and the central control unit 40 proceeds to a no-ringing communication process. Therefore, the determination result is immediately transmitted from the ringing incoming call determination unit 37 to the central control unit 40 even if the determination of the no ringing incoming call is not completed, and the network control unit 14 is closed to supplement the line. In other words, no incoming ringing is interrupted.
[0078]
Next, in the case of a ringing incoming call, when a signal is temporarily output from the ringing detection unit 16 to the ringing incoming call determination unit 37 at the time of polarity reversal, the ringing incoming call determination unit 37 immediately determines the determination result of the ringing incoming call condition matching. obtain. However, the delay output unit 38 does not immediately transmit the determination result to the ringing incoming call response unit 18 or the central control unit 40 and waits for 0.5 seconds.
[0079]
On the other hand, since the NR incoming call determination unit 12 gives a determination result of no ringing incoming call within 0.4 seconds, monitoring of the no ringing incoming call ends here. Thereafter, the ringing incoming call establishment determination result is transmitted from the delay output unit 38 to the ringing incoming call response unit 18 and the central control unit 40, and the process proceeds to the ringing communication process.
[0080]
In addition, when ringing is received when connected to a line that does not cause polarity reversal, polarity reversal does not occur. Therefore, monitoring by the NR call determination unit 12 is not performed, and ringing termination processing is executed with a delay of 0.5 seconds. Will be.
[0081]
By providing the delay output unit 38 in this way, even if the ringing incoming condition is set to perform ringing communication immediately after detecting the ringing call signal, ringing communication can be performed without changing the setting, and no ringing communication is performed. You can also.
[0082]
【The invention's effect】
As described above, according to the line terminal device of the present invention, ringing can be received even when connected to a line where polarity reversal occurs or a line where polarity reversal occurs without changing the setting of the line terminal device. Further, there is an effect that no ringing incoming call can be made in a setting state where ringing incoming call can be made.
[Brief description of the drawings]
FIG. 1 is a block configuration diagram of a line terminal apparatus according to a first embodiment of the present invention.
FIG. 2 is a block diagram showing a connection state of the apparatus to an ISDN line
FIG. 3 is a block configuration diagram of a line terminal apparatus according to a second embodiment of the present invention.
FIG. 4 is a block diagram of a conventional line terminal device.
FIG. 5 is a signal waveform diagram when the polarity inversion and ringing call signal of the device arrives.
FIG. 6 is another block diagram of the apparatus.
[Explanation of symbols]
2 Data terminal equipment
3 Public line
4 exchanges
5 Central monitoring equipment
6 Telephone
8 Terminal interface
10 Polarity reversal detector
11 NR incoming call detector
12 NR incoming call determination unit
13 NR incoming call response section
14 Network control unit
15 Transceiver
16 Ringing detector
18 Ringing incoming call response section
27 Incoming call condition setting section
37 Ringing incoming call determination unit
30 Central control unit

Claims (2)

A polarity reversal detection unit that detects the polarity reversal of the line and outputs it with a delay;
An NR incoming detection unit that detects a no ringing call signal sent from the line when polarity inversion is detected by the polarity inversion detection unit;
An NR incoming call determination unit for determining whether the no ringing call signal detected by the NR incoming call detection unit is a call signal of the own terminal;
An NR incoming call response unit that outputs an incoming call response signal to the line when the NR incoming call determination unit determines that the call signal of the terminal itself;
A ringing detector for detecting a ringing signal of a ringing ringing signal sent from the line;
An incoming condition setting unit in which the number and time of ringing ringing signals are set as response conditions for ringing incoming calls, and
The ringing call signal ringing signal detected by the ringing detection unit is monitored, and the ringing ringing signal ringing signal detected by the ringing detection unit is validated when the setting condition is satisfied as compared with the incoming call condition setting unit. And, if not established, a ringing incoming determination unit that invalidates the ringing call signal detected by the ringing detection unit, and
A ringing incoming call response unit that sends an incoming call response signal to the line side when it is determined by the ringing incoming call determination unit that a setting condition has been established ,
The line terminal device which ends the ringing incoming call determination processing after confirming that the ringing signal does not come within a predetermined time after the ringing signal stops . A polarity reversal detection unit that detects the polarity reversal of the line and outputs it with a delay;
An NR incoming detection unit that detects a no ringing call signal sent from the line when polarity inversion is detected by the polarity inversion detection unit;
An NR incoming call determination unit for determining whether the no ringing call signal detected by the NR incoming call detection unit is a call signal of the own terminal;
An NR incoming call response unit that outputs an incoming call response signal to the line when the NR incoming call determination unit determines that the call signal of the terminal itself;
A ringing detector for detecting a ringing signal of a ringing ringing signal sent from the line;
An incoming condition setting unit in which the number and time of ringing ringing signals are set as response conditions for ringing incoming calls, and
The ringing call signal ringing signal detected by the ringing detection unit is monitored, and the ringing ringing signal ringing signal detected by the ringing detection unit is validated when the setting condition is satisfied as compared with the incoming call condition setting unit. And, if not established, a ringing incoming determination unit that invalidates the ringing call signal detected by the ringing detection unit, and
A ringing incoming call response unit that sends an incoming call response signal to the line side when it is determined by the ringing incoming call determination unit that a setting condition has been established;
Is delayed than the total time of the output delay time of the polarity inversion detection unit and the non-ringing call determination time, the line terminal devices having a delay output unit for outputting a determination result of the ringing incoming call determination unit.

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