JP7099252B2 - Communication terminal device - Google Patents

Description

The present invention relates to a communication terminal device having a facsimile communication function.

In a conventional communication terminal device, when a line is captured, it is detected that the line voltage or the line current exceeds a threshold value to detect an excessive voltage or an excessive current from the line (see, for example, Patent Document 1). ).

Japanese Unexamined Patent Publication No. 2013-121791

However, in the conventional technique, even if the detected line voltage or line current is equal to or less than the threshold value, if the resistance value of the exchange connected to the communication terminal device via the line is smaller than the predetermined resistance value, the communication terminal device When a line is captured by an external telephone connected to, if a telephone with a small DC resistance value is connected, an excessive current may flow in the communication terminal device, causing the communication terminal device or telephone to fail. There is a problem that it may end up.
An object of the present invention is to solve such a problem, and an object of the present invention is to suppress a failure of a communication terminal device or a telephone that occurs when a line is captured.

Therefore, the present invention has a line voltage detection unit that detects the line voltage and a line current detection in a communication terminal device that is connected to the switch via a line and has a facsimile communication function to which an external telephone can be connected. The line current detection unit, the calculation unit that obtains the characteristics of the switch connected to the line based on the voltage detected by the line voltage detection unit and the current detected by the line current detection unit, and the line are captured. A line capture detection unit that detects The calculation unit includes a calculation unit, a line acquisition detection unit, and a line control unit that controls the switching unit. The calculation unit is a resistance value calculation unit that calculates the resistance value of the switch, and the line acquisition detection unit. The unit is a hookup detection unit that detects the current from the line and detects the hookup of the telephone, and the hookup detection unit detects the current from the line and detects the state in which the line is captured. The line control unit detects the first line voltage by the line voltage detection unit and detects hookup by the hookup detection unit in a state where the hookup detection unit detects that the hookup is not hooked up. When the DC loop forming unit forms a DC loop and the line and the telephone are disconnected by the switching unit, the line voltage detecting unit detects the second line voltage, and the line current detecting unit detects the line. The current is detected, the resistance value of the switch is calculated by the resistance value calculation unit based on the first line voltage, the second line voltage, and the line current, and the line abnormality is detected based on the resistance value. When detected, the line and the telephone are disconnected.

The present invention in this way has the effect of suppressing the failure of the communication terminal device or the telephone that occurs when the line is captured.

A block diagram showing a configuration of a communication terminal device and a connection with a line network in an embodiment. A block diagram showing a configuration of a line control unit of a communication terminal device in an embodiment. Time chart showing the operation of the line control unit in the embodiment Time chart showing the operation of the line control unit in the embodiment Time chart showing the operation of the line control unit in the embodiment Time chart showing the operation of the line control unit in the embodiment Time chart showing the operation of the line control unit in the embodiment Time chart showing the operation of the line control unit in the embodiment Time chart showing the operation of the line control unit in the embodiment Time chart showing the operation of the line control unit in the embodiment Explanatory drawing of circuit in Example A flowchart showing the operation of the circuit control unit in the embodiment. Explanatory drawing which shows DC holding and operation state of a relay in an Example Explanatory drawing of calculation method of resistance value of exchange in Example

Hereinafter, examples of the communication terminal device according to the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a communication terminal device and a connection with a line network in an embodiment.
In FIG. 1, the communication terminal device 102 is connected to an exchange via a line and has a facsimile communication function to which an external telephone can be connected, and is, for example, a facsimile device. The communication terminal device 102 is connected to the exchange 109 via a communication line (hereinafter referred to as “line”) 101a, and performs telephone communication and facsimile communication with the exchange 109. Further, the exchange 109 is communicably connected to another exchange via the line network 101b.

The communication terminal device 102 includes a line control unit 103, a scanner unit 104, a printing unit 105, a line terminal 107, and a telephone terminal 108.
The line control unit 103 is connected to the line 101a as a telephone line via the line terminal 107, and performs telephone communication or facsimile communication for a call with the exchange 109 connected to the line 101a. Further, the line control unit 103 is connected to the external telephone 106, which is an external telephone, via the telephone terminal 108. Further, the line control unit 103 is connected to the scanner unit 104 and the printing unit 105.
The details of the line control unit 103 will be described later.

The scanner unit 104 reads the original and converts it into image data. The scanner unit 104 is connected to the line control unit 103, and transmits the image data of the scanned document to the communication terminal device of the transmission destination through the line control unit 103 as a facsimile via the line 101a and the exchange 109.
Further, the scanner unit 104 is connected to the printing unit 105, sends the image data of the scanned document to the printing unit 105, and prints it as a copy of the document.

The printing unit 105 prints image data on a printing medium. The printing unit 105 prints image data of a document sent as a facsimile from a communication device of a transmission source connected via a line 101a and an exchange 109 via a line control unit 103. Further, the printing unit 105 prints the image data of the original document sent from the scanner unit 104. Further, the image data generated by the line control unit 103 is printed.
The external telephone 106 connected to the telephone terminal 108 is used to make a call with the telephone of the other party via the line control unit 103, the line 101a, and the exchange 109.

FIG. 2 is a block diagram showing a configuration of a line control unit of a communication terminal device according to an embodiment.
In FIG. 2, the line control unit 103 of the communication terminal device 102 includes a host unit 110, a communication control unit 200, a modem 210, an insulation delivery unit 220, a silicon DAA (direct access arrangement) 230, and a DC loop. An exchange 109 or an external device that controls the forming unit 240, the relay 250, the diode bridge 260, the relay drive circuit 270, and the external telephone hookup detection unit 280, and is connected via the line 101b shown in FIG. It controls communication such as telephone communication and facsimile communication with the telephone 106.

The line control unit 103 has a line terminal 107 connected to the line 101a shown in FIG. 1 and a telephone terminal 108 connected to the external telephone 106.

The communication control unit 200 controls the overall operation of the line control unit 103, and includes a fax communication processing unit 201, a ring detection determination unit 202, a DC loop formation instruction unit 203, and a DC loop formation determination unit 204. , A relay control unit 205, an external telephone hookup determination unit 206, a line voltage acquisition unit 207, a line current acquisition unit 208, and a switch side resistance value calculation unit 209.
The FAX communication processing unit 201 is connected to the control I / F 211 of the modem 210, which will be described later, and exchanges facsimile signals on the line.

The ring detection determination unit 202 detects a ring signal arriving from the line. The ring detection determination unit 202 is connected to the control I / F211 of the modem 210, and the ring signal arriving from the line is converted into a signal that can be discriminated by the communication control unit 200 by the control I / F211. The OFF time is determined to determine whether or not a ring signal has arrived, and the ring signal is detected.

The DC loop forming instruction unit 203 is connected to the control I / F 211 of the modem 210, and instructs the DC loop forming unit 240 to form a DC loop of the line.
The DC loop formation determination unit 204 as the line capture detection unit is connected to the control I / F 211 of the modem 210, and whether or not the DC loop formation unit 240 holds the DC of the line, that is, the DC loop formation unit 240 causes the DC loop. It is to judge whether or not is formed.

The DC loop forming determination unit 204 determines that the DC loop has been formed by the DC loop forming unit 240, and the line has been captured, that is, the communication with the exchange 109 shown in FIG. 1 is possible. Is detected.
The relay control unit 205 is connected to the relay drive unit 270 and controls the operation of the relay 250.

The external telephone hookup determination unit 206 as a line capture detection unit is connected to the external telephone hookup detection unit 280, monitors the output from the external telephone hookup detection unit 280 for a predetermined time, and monitors the external telephone 106. Is to determine if has been hooked up.
The external telephone hookup determination unit 206 determines that the external telephone 106 has been hooked up, and determines that the line has been captured, that is, that communication with the exchange 109 shown in FIG. 1 is possible. To detect.

The line voltage acquisition unit 207 is connected to the control I / F 211 of the modem 210 and the switch side resistance value calculation unit 209, and acquires the line voltage obtained by the line voltage detection unit 233 in the silicon DAA 230.
The line current acquisition unit 208 as a line current detection unit is connected to the control I / F 211 of the modem 210 and the resistance value calculation unit 209 on the switch side, and transfers the line current flowing through the DC loop forming unit 240 to the I / F 231 in the silicon DAA 230. It is detected and acquired through.

The switch side resistance value calculation unit 209 as a calculation unit (resistance value calculation unit) obtains the characteristics of the switch side, is connected to the switch side resistance value determination unit 111 of the host unit 110, and is connected to the line voltage acquisition unit 207. The resistance value of the switch 109 connected to the line 101a shown in FIG. 1 is calculated based on the obtained line voltage and the line current obtained by the line current acquisition unit 208.
The modem 210 converts the signal from the line into a signal that can be processed by the communication control unit 200, or converts the signal from the communication control unit 200 and sends it to the line. It has an I / F 212.

The control I / F 211 is an interface for exchanging signals between the modem 210 and the communication control unit 200.
The I / F 212 is connected to the control I / F 211 and the insulation delivery unit 220, and is an interface for exchanging signals between the modem 210 and the silicon DAA 230.

The insulation transfer unit 220 directly separates the primary side and the secondary side of the line, and is connected to the I / F 231 in the silicon DAA 230 and the I / F 212 in the modem 210.
The silicon DAA 230 is arranged between the line and the modem 210 to send and receive signals to the line, and has an I / F 231, a ring detection unit 232, and a line voltage detection unit 233. ing.

The I / F 231 is connected to an insulation delivery unit 220, a ring detection unit 232, a line voltage detection unit 233, and a DC loop forming unit 240. The I / F 231 is an interface that transmits a signal from the line to the modem 210 and sends a signal from the modem 210 to the line.
The ring detection unit 232 as the call signal detection unit is connected to the AC input side A and AC input side B of the diode bridge 260, the line terminal 107, the relay 250, and the line voltage detection unit 233, and arrives from the line. This is an interface for detecting a ring signal as a ringing signal and passing it to the ring detection determination unit 202 of the communication control unit 200.

The line voltage detection unit 233 is connected to the line terminal 107 and detects the voltage of the line terminal 107 in order to detect the voltage of the line.
The DC loop forming unit 240 is connected to the + side of the diode bridge 260, the-side of the diode bridge 260, and the I / F 231 and the ground of the silicon DAA 230, and holds the DC of the line to form a DC loop between the lines. Is formed, and the line current value is transmitted to the I / F 231 of the silicon DAA230.

By forming the DC loop, the silicon DAA230 is connected to the line (the line is captured). This enables facsimile communication and the like.
The diode bridge 260 matches the polarity of the direct current of the line with the direct current loop forming unit 240, and even when the polarity of the line is reversed, the direct current of one direction of the direct current loop forming unit 240 is supplied.

The relay 250 as a switching unit is connected to the telephone terminal 108 and the external telephone hookup detection unit 280, and switches between connection and disconnection with the telephone terminal 108 to connect and disconnect the line and the external telephone 106. It is something to switch. When the communication terminal device 102 is in the standby state, the relay 250 is connected to the telephone terminal 108 in the illustrated state, and the user can make a call using the external telephone 106. On the other hand, when performing facsimile communication, the relay 250 disconnects from the telephone terminal 108 to prevent noise or the like from the transmitter of the external telephone 106 from entering the modem 210 through the silicon DAA 230.

The relay drive circuit 270 is connected to a power source via a coil and is also connected to a relay 250 to drive a coil provided in the relay 250.
When the external telephone 106 is hooked up, the external telephone hookup detection unit 280 operates by the direct current of the line and detects the off-hook and the on-hook of the external telephone 106. The external telephone hookup detection unit 280, together with the external telephone hookup determination unit 206, constitutes a line capture detection unit that detects the current from the line and detects the hookup of the telephone, and detects the current from the line. To detect the state in which the line is captured.

The line terminal 107 is connected to the line and is an insertion port for a communication cable. Further, the telephone terminal 108 is connected to the external telephone 106 and the external telephone hookup detection unit 280, and is an insertion port for a communication cable.

When the host unit 110 determines that the line connected to the communication control unit 200 is abnormal, the host unit 110 notifies the communication control unit 200 of a signal indicating the abnormality, and the switch side resistance value determination unit 111 and the abnormality warning notification unit. It has 112 and.

The switch side resistance value determination unit 111 is connected to the abnormality warning notification unit 112, and determines whether or not the value calculated by the switch side resistance value calculation unit 209 of the communication control unit 200 is less than the threshold value (predetermined resistance value). It is a thing. The threshold value can be appropriately set according to the connected line.
The abnormality warning notification unit 112 is connected to the communication control unit 200, and when the value calculated by the exchange side resistance value calculation unit 209 is determined by the exchange side resistance value determination unit 111 to be less than the threshold value, the abnormality notification unit 112 is used to notify the user of the abnormality. Is instructed to print a warning word or the like as a line abnormality notification (warning output).

The line control unit 103 of the communication terminal device 102 configured in this way is a line voltage detection unit in a state where the DC loop formation determination unit 204 and the external telephone hookup determination unit 206 detect that the line is not captured. When the first line voltage is detected by 233, the line voltage is acquired by the line voltage acquisition unit 207, and the line is captured by the DC loop formation determination unit 204 or the external telephone hookup determination unit 206. In a state where the line and the external telephone 106 are disconnected by the relay 250, the line voltage detection unit 233 detects the second line voltage, the line voltage acquisition unit 207 acquires the line voltage, and the DC loop forming unit 240 obtains the line voltage. The line current is detected, the line current is acquired by the line current acquisition unit 208, and the switch side resistance value calculation unit 209 shows it in FIG. 1 based on the first line voltage, the second line voltage, and the line current. When the resistance value of the switch 109 connected to the line 101a is calculated and an abnormality in the line is detected based on the resistance value, the line 101a and the external telephone 106 are disconnected.

The operation of the above-mentioned configuration will be described.

First, the line control of the communication terminal device 102 when the user hooks up (off-hooks) the external telephone 106 shown in FIG. 1 and it is determined that the resistance value on the exchange side is equal to or higher than the threshold value and is connected to a normal line. The operation of the unit 103 will be described with reference to FIGS. 1 and 2 according to the timing represented by T in the time chart showing the operation of the line control unit in the embodiment of FIG.

T1: The line voltage detection unit 233 of the silicon DAA230 detects the line voltage. This voltage is the voltage on the exchange side. The external telephone 106 is in the on-hook state, and the external telephone hookup detection unit 280 is in the state of not detecting the hookup of the external telephone 106.

T2: The line voltage acquisition unit 207 of the communication control unit 200 acquires the line voltage (voltage on the exchange side) detected by the line voltage detection unit 233.

Here, a method of acquiring the line voltage (voltage on the exchange side) will be described with reference to FIG. 14A.

In FIG. 14A, the voltage on the switch side is V, the resistance on the switch side is R, the resistance of the DC holding portion on the silicon DAA230 side is R _DAA , the voltage of the DC holding portion on the silicon DAA230 side is V _DAA , and the line current is. Let it be I _DAA .

At the time of on-hook, the line current I _DAA flowing to the line control unit 103 side is [0] A. Therefore, the voltage (first line voltage) V _DAA of the DC holding portion on the silicon DAA 230 side at the time of on-hook becomes the voltage V on the exchange side, and the voltage V on the exchange side can be acquired by the line voltage acquisition unit 207 of the communication control unit 200. It becomes.

T3: When the external telephone 106 is hooked up by the user, the external telephone hookup detection unit 280 detects the hookup of the external telephone 106.

T4: The external telephone hookup determination unit 206 of the communication control unit 200 determines that the external telephone 106 has been hooked up by the output from the external telephone hookup detection unit 280.

T5: When the external telephone hookup determination unit 206 determines that the external telephone 106 has been hooked up, the DC loop formation instruction unit 203 connects the line to the DC loop formation unit 240 in order to capture the line on the silicon DAA 230 side. Instructs the formation of a DC loop.

T6: The DC loop forming unit 240 forms a DC loop of the line.

T7: When the DC loop forming unit 240 forms a DC loop, the DC loop forming determination unit 204 of the communication control unit 200 determines that the DC loop forming unit 240 has formed a DC loop.

T8: When the DC loop formation determination unit 204 determines that the DC loop has been formed, the relay control unit 205 instructs the relay drive circuit 270 to turn on the relay 250 in order to disconnect (disconnect) the external telephone 106 from the line. do.

T9: The relay 250 is driven and the external telephone 106 is disconnected from the line.

T10: When the external telephone 106 is disconnected from the line, the line voltage detection unit 233 of the silicon DAA230 detects the voltage of the line. Further, the DC loop forming unit 240 detects the DC current of the line.

T11: The line voltage acquisition unit 207 acquires the line voltage from the line voltage detection unit 233, and the line current acquisition unit 208 acquires the line current from the DC loop forming unit 240.

In this way, when the line control unit 103 detects the hookup by the external telephone hookup detection unit 280 (T3), the line control unit 103 forms a DC loop (T6) by the DC loop forming unit 240 and externally connects to the line by the relay 250. With the telephone 106 disconnected (T9), the line voltage acquisition unit 207 acquires the second line voltage, and the line current acquisition unit 208 acquires the line current.

T12: The resistance value calculation unit 209 on the switch side is a resistance on the switch side based on the line voltage acquired in T2, the line voltage acquired by the line voltage acquisition unit 207 in T11, and the line current acquired by the line current acquisition unit 208. Calculate the value.

Here, a method of calculating the resistance value on the exchange side at the time of hook-up (off-hook) will be described with reference to FIG. 14 (b).

In FIG. 14B, the voltage on the switch side is V, the resistance on the switch side is R, the resistance of the DC holding portion on the silicon DAA230 side is R _DAA , the voltage of the DC holding portion on the silicon DAA230 side is V _DAA , and the line current is. Let it be I _DAA .

At the time of hook-up (off-hook), the line current I _DAA flows on the line control unit 103 side. This line current I _DAA is acquired by the communication control unit 200 through the silicon DAA 230. Further, the voltage (second line voltage) V _DAA of the DC holding portion on the silicon DAA 230 side at the time of hook-up (off-hook) is also acquired by the communication control unit 200.

V (first line voltage) -V _DAA (second line voltage) = I _DAA (line current) x R (resistance on the exchange side), and the resistance value R on the exchange side is R = (V-V _DAA ). ) / I _DAA
It is calculated by the formula of.

In this way, the exchange-side resistance value calculation unit 209 calculates the exchange-side resistance value R.

T13: The exchange side resistance value determination unit 111 of the host unit 110 determines that the resistance value on the exchange side calculated by the exchange side resistance value calculation unit 209 is equal to or higher than the threshold value, and determines that the line is connected to a normal line. ..

T14: The relay control unit 205 instructs the relay drive circuit 270 to turn off the relay 250 in order to connect the external telephone 106 to the line.

T15: The relay 250 is turned off and the external telephone 106 is connected to the line.

T16: The DC loop forming instruction unit 203 stops the instruction to form the DC loop of the line to the DC loop forming unit 240 in order to disconnect the line captured by the silicon DAA 230 side.

T17: The DC loop forming unit 240 releases the formation of the DC loop of the line.

T18: The DC loop forming determination unit 204 of the communication control unit 200 determines that the DC loop forming unit 240 does not form a DC loop.

As a result, the user can make a call using the external telephone 106.

Next, the line of the communication terminal device 102 when the user hooks up (off-hooks) the external telephone 106 shown in FIG. 1 and it is determined that the resistance value on the exchange side is less than the threshold value and is connected to an abnormal line. The operation of the control unit 103 will be described with reference to FIGS. 1 and 2 according to the timing represented by T in the time chart showing the operation of the line control unit in the embodiment of FIG.

T1 to T12: Since it is the same as T1 to T12 shown in FIG. 3, the description thereof will be omitted.

T13: The exchange side resistance value determination unit 111 of the host unit 110 determines that the resistance value on the exchange side calculated by the exchange side resistance value calculation unit 209 is less than the threshold value, and determines that the connection is connected to an abnormal line. ..

T14: The DC loop forming instruction unit 203 stops the instruction to form the DC loop of the line to the DC loop forming unit 240 in order to disconnect the line captured by the silicon DAA 230 side.

T15: The DC loop forming unit 240 releases the formation of the DC loop of the line.

T16: The DC loop forming determination unit 204 of the communication control unit 200 determines that the DC loop forming unit 240 does not form a DC loop.

T17: The abnormality warning notification unit 112 of the host unit 110 prints on the print medium that the line is abnormal in the printing unit 105 in order to notify the user of the line abnormality.

As described above, when the line control unit 103 determines that the line is connected to the abnormal line based on the resistance value of the exchange 109, the line control unit 103 outputs a warning of the line abnormality.

As described above, the line control unit 103 can detect an abnormality in the line and notify the user.

By performing the operations from T3 to T16 in a short time, the occurrence of failure of the external telephone 106 and the external telephone hookup detection unit 280 is suppressed.

As described above, in FIGS. 3 and 4, the case where the user hooks up the external telephone has been described, but in addition, the ring signal as a ring signal from the line is assumed to be the user hooking up the external telephone. May respond. In this case, a ring signal arrives between T2 and T3 in FIGS. 3 and 4, and the user hooks up the external telephone, and the subsequent operations are the same as those after T3 in FIGS. 3 and 4.

When a ring signal arrives from the line, the user hooks up (off-hooks) the external telephone 106 shown in FIG. 1, and it is determined that the resistance value on the exchange side is equal to or higher than the threshold value and is connected to a normal line. The operation of the line control unit 103 of the communication terminal device 102 will be described with reference to FIGS. 1 and 2 according to the timing represented by T in the time chart showing the operation of the line control unit in the embodiment of FIG.

T1, T2: Since it is the same as T1 and T2 shown in FIG. 3, the description thereof will be omitted.

T3: When a ring signal arrives from the line to the line control unit 103 of the communication terminal device 102, the ring detection unit 232 of the silicon DAA 230 detects the ring signal.

T4: The ring detection determination unit 202 of the communication control unit 200 determines that the ring signal has arrived.

The ring detection unit 232 is shown in T3, and the ring detection determination unit 202 is shown in T4. However, since the user hears the ringing sound of the external telephone 106 and hooks up the external telephone 106, the ring detection unit is particularly effective. It is not necessary for the 232 and the ring detection determination unit 202 to operate. In FIG. 5, the ring detection unit 232 and the ring detection determination unit 202 will be described as operating.

T5 to T20: Since it is the same as T3 to T18 shown in FIG. 3, the description thereof will be omitted.

Next, when a ring signal arrives from the line, the user hooks up (off-hooks) the external telephone 106 shown in FIG. 1, and determines that the resistance value on the exchange side is less than the threshold value and is connected to an abnormal line. The operation of the line control unit 103 of the communication terminal device 102 in this case will be described with reference to FIGS. 1 and 2 according to the timing represented by T in the time chart showing the operation of the line control unit in the embodiment of FIG. do.

T1, T2: Since it is the same as T1 and T2 shown in FIG. 4, the description thereof will be omitted.

T3: When a ring signal arrives from the line to the line control unit 103 of the communication terminal device 102, the ring detection unit 232 of the silicon DAA 230 detects the ring signal.

T4: The ring detection determination unit 202 of the communication control unit 200 determines that the ring signal has arrived.

The ring detection unit 232 is shown in T3, and the ring detection determination unit 202 is shown in T4. However, since the user hears the ringing sound of the external telephone 106 and hooks up the external telephone 106, the ring detection unit is particularly effective. It is not necessary for the 232 and the ring detection determination unit 202 to operate. In FIG. 6, the ring detection unit 232 and the ring detection determination unit 202 will be described as operating.

T5 to T19: Since it is the same as T3 to T17 shown in FIG. 4, the description thereof will be omitted.

Next, when a ring signal arrives from the line, the line is captured by the silicon DAA230 side shown in FIG. 2, it is determined that the resistance value on the exchange side is equal to or higher than the threshold value and the line is connected to a normal line, and facsimile reception is performed. The operation of the line control unit 103 of the communication terminal device 102 will be described with reference to FIGS. 1 and 2 according to the timing represented by T in the time chart showing the operation of the line control unit in the embodiment of FIG. 7.

T1, T2: Since it is the same as T1 and T2 shown in FIG. 3, the description thereof will be omitted.

T3: When a ring signal arrives from the line to the line control unit 103 of the communication terminal device 102, the ring detection unit 232 of the silicon DAA 230 detects the ring signal.

T4: The ring detection determination unit 202 of the communication control unit 200 determines that the ring signal has arrived.

T5: When the ring detection determination unit 202 determines that the ring signal has arrived, the DC loop formation instruction unit 203 instructs the DC loop formation unit 240 to form a DC loop of the line in order to capture the line on the silicon DAA 230 side. do.

T6: The DC loop forming unit 240 forms a DC loop of the line.

T7: When the DC loop forming unit 240 forms a DC loop, the DC loop forming determination unit 204 of the communication control unit 200 determines that the DC loop forming unit 240 has formed a DC loop.

As described above, when the line control unit 103 detects the ring signal by the ring detection unit 232 at the time of facsimile reception, the DC loop forming unit 240 forms a DC loop, and the DC loop formation determination unit 204 forms the DC loop forming unit 240. Detects that a DC loop has been formed and detects the state in which the line is captured.

T8: When the DC loop formation determination unit 204 determines that the DC loop has been formed, the relay control unit 205 instructs the relay drive circuit 270 to turn on the relay 250 in order to disconnect (disconnect) the external telephone 106 from the line. do.

T9: The relay 250 is driven and the external telephone 106 is disconnected from the line.

T10: When the external telephone 106 is disconnected from the line, the line voltage detection unit 233 of the silicon DAA230 detects the voltage of the line. Further, the DC loop forming unit 240 detects the DC current of the line.

T11: The line voltage acquisition unit 207 acquires the line voltage from the line voltage detection unit 233, and the line current acquisition unit 208 acquires the line current from the DC loop forming unit 240.

In this way, when the line control unit 103 detects that the DC loop is formed by the DC loop formation determination unit 204, the line voltage detection unit 233 is in a state where the line and the external telephone 106 are disconnected by the relay 250. The line voltage of 2 is detected (the second line voltage is acquired by the line voltage acquisition unit 207), and the line current is acquired by the line current acquisition unit 208.

T12: The resistance value calculation unit 209 on the switch side is a resistance on the switch side based on the line voltage acquired in T2, the line voltage acquired by the line voltage acquisition unit 207 in T11, and the line current acquired by the line current acquisition unit 208. Calculate the value.

The method of calculating the resistance value on the exchange side is the same as that of T12 in FIG.

T13: The exchange side resistance value determination unit 111 of the host unit 110 determines that the resistance value on the exchange side calculated by the exchange side resistance value calculation unit 209 is equal to or higher than the threshold value, and determines that the line is connected to a normal line. ..

T14: The FAX communication processing unit 201 starts facsimile communication (facsimile reception) processing.

T15: The FAX communication processing unit 201 ends the facsimile communication (facsimile reception) processing.

T16: The relay control unit 205 instructs the relay drive circuit 270 to turn off the relay 250 in order to connect the external telephone 106 to the line.

T17: The relay 250 is turned off and the external telephone 106 is connected to the line.

T18: The DC loop forming instruction unit 203 stops the instruction to form the DC loop of the line to the DC loop forming unit 240 in order to disconnect the line captured by the silicon DAA 230 side.

T19: The DC loop forming unit 240 releases the formation of the DC loop of the line.

T20: The DC loop forming determination unit 204 of the communication control unit 200 determines that the DC loop forming unit 240 does not form a DC loop.

Next, when a ring signal arrives from the line, the line is captured by the silicon DAA230 side shown in FIG. 2, and it is determined that the resistance value on the exchange side is less than the threshold value and the line is connected to an abnormal line, the communication terminal device 102 The operation of the line control unit 103 will be described with reference to FIGS. 1 and 2 according to the timing represented by T in the time chart showing the operation of the line control unit in the embodiment of FIG.

T1 to T12: Since it is the same as T1 to T12 shown in FIG. 7, the description thereof will be omitted.

T13: The exchange side resistance value determination unit 111 of the host unit 110 determines that the resistance value on the exchange side calculated by the exchange side resistance value calculation unit 209 is less than the threshold value, and determines that the connection is connected to an abnormal line. ..

T14: The relay control unit 205 instructs the relay drive circuit 270 to turn off the relay 250 in order to connect the external telephone 106 to the line.

T15: The relay 250 is turned off and the external telephone 106 is connected to the line.

At this time, since the external telephone 106 is not hooked up, even if the relay 250 is turned off and the external telephone 106 is connected to the line, an excessive current does not flow from the line to the external telephone 106.

If it is determined that the switch side resistance value determination unit 111 is connected to an abnormal line, the relay 250 may be kept on and the external telephone 106 may be kept disconnected from the line. ..

T16: The DC loop forming instruction unit 203 stops the instruction to form the DC loop of the line to the DC loop forming unit 240 in order to disconnect the line captured by the silicon DAA 230 side.

T17: The DC loop forming unit 240 releases the formation of the DC loop of the line.

T18: The DC loop forming determination unit 204 of the communication control unit 200 determines that the DC loop forming unit 240 does not form a DC loop.

T19: The abnormality warning notification unit 112 of the host unit 110 prints on the print medium that the line is abnormal in the printing unit 105 in order to notify the user of the line abnormality.

As described above, when the line control unit 103 determines that the line is connected to the abnormal line based on the resistance value of the exchange 109, the line control unit 103 outputs a warning of the line abnormality.

As described above, the line control unit 103 can detect an abnormality in the line and notify the user.

By performing the operations from T5 to T18 in a short time, the occurrence of failure of the silicon DAA230 is suppressed.

Next, during facsimile transmission, the line control unit of the communication terminal device 102 captures the line on the silicon DAA230 side shown in FIG. 2 and determines that the line is connected to a normal line when the resistance value on the exchange side is equal to or higher than the threshold value. The operation of 103 will be described with reference to FIGS. 1 and 2 according to the timing represented by T in the time chart showing the operation of the line control unit in the embodiment of FIG.

T1, T2: Since it is the same as T1 and T2 shown in FIG. 3, the description thereof will be omitted.

T3: The DC loop forming instruction unit 203 instructs the DC loop forming unit 240 to form a DC loop of the line in order to capture the line on the silicon DAA 230 side.

T4: The DC loop forming unit 240 forms a DC loop of the line.

T5: When the DC loop forming unit 240 forms a DC loop, the DC loop forming determination unit 204 of the communication control unit 200 determines that the DC loop forming unit 240 has formed a DC loop.

T6: When the DC loop formation determination unit 204 determines that the DC loop has been formed, the relay control unit 205 instructs the relay drive circuit 270 to turn on the relay 250 in order to disconnect (disconnect) the external telephone 106 from the line. do.

T7: The relay 250 is driven and the external telephone 106 is disconnected from the line.

T8: When the external telephone 106 is disconnected from the line, the line voltage detection unit 233 of the silicon DAA230 detects the voltage of the line. Further, the DC loop forming unit 240 detects the DC current of the line.

T9: The line voltage acquisition unit 207 acquires the line voltage from the line voltage detection unit 233, and the line current acquisition unit 208 acquires the line current from the DC loop forming unit 240.

T10: The resistance value calculation unit 209 on the switch side is a resistance on the switch side based on the line voltage acquired in T2, the line voltage acquired by the line voltage acquisition unit 207 in T9, and the line current acquired by the line current acquisition unit 208. Calculate the value.

The method of calculating the resistance value on the exchange side is the same as that of T12 in FIG.

T11: The exchange side resistance value determination unit 111 of the host unit 110 determines that the resistance value on the exchange side calculated by the exchange side resistance value calculation unit 209 is equal to or higher than the threshold value, and determines that the line is connected to a normal line. ..

T12: The FAX communication processing unit 201 starts facsimile communication (facsimile transmission) processing.

T13: The FAX communication processing unit 201 ends the facsimile communication (facsimile transmission) processing.

T14 to T18: Since it is the same as T16 to T20 shown in FIG. 7, the description thereof will be omitted.

Next, during facsimile transmission, the line control unit of the communication terminal device 102 captures the line on the silicon DAA230 side shown in FIG. 2 and determines that the resistance value on the exchange side is less than the threshold value and is connected to an abnormal line. The operation of 103 will be described with reference to FIGS. 1 and 2 according to the timing represented by T in the time chart showing the operation of the line control unit in the embodiment of FIG.

T1 to T10: Since it is the same as T1 to T10 shown in FIG. 9, the description thereof will be omitted.

T11: The exchange side resistance value determination unit 111 of the host unit 110 determines that the resistance value on the exchange side calculated by the exchange side resistance value calculation unit 209 is less than the threshold value, and determines that the connection is connected to an abnormal line. ..

T12: The relay control unit 205 instructs the relay drive circuit 270 to turn off the relay 250 in order to connect the external telephone 106 to the line.

T13: The relay 250 is turned off and the external telephone 106 is connected to the line.

At this time, since the external telephone 106 is not hooked up, even if the relay 250 is turned off and the external telephone 106 is connected to the line, an excessive current does not flow from the line to the external telephone 106.

If it is determined that the switch side resistance value determination unit 111 is connected to an abnormal line, the relay 250 may be kept on and the external telephone 106 may be kept disconnected from the line. ..

T14: The DC loop forming instruction unit 203 stops the instruction to form the DC loop of the line to the DC loop forming unit 240 in order to disconnect the line captured by the silicon DAA 230 side.

T15: The DC loop forming unit 240 releases the formation of the DC loop of the line.

T16: The DC loop forming determination unit 204 of the communication control unit 200 determines that the DC loop forming unit 240 does not form a DC loop.

T17: The abnormality warning notification unit 112 of the host unit 110 prints on the print medium that the line is abnormal in the printing unit 105 in order to notify the user of the line abnormality.

As described above, the line control unit 103 can detect an abnormality in the line and notify the user.

By performing the operations from T3 to T16 in a short time, the occurrence of failure of the silicon DAA230 is suppressed.

Next, FIG. 1, FIG. 2 and FIG. 13 show the operation of the line control unit 103 of the communication terminal device 102 shown in FIG. 1 according to the step represented by S in the flowchart showing the operation of the circuit control unit in the embodiment of FIG. It will be explained with reference to it. Note that FIG. 13 is an explanatory diagram showing the DC holding and the operating state of the relay in the embodiment, and the DC loop forming unit 240 and the diode bridge 260 shown in FIG. 11A are simplified as shown in FIG. 11B. It is shown in the circuit diagram.

S101: The line voltage detection unit 233 of the silicon DAA230 detects the line voltage. This voltage is the voltage on the exchange side. The external telephone 106 is in the on-hook state, and the external telephone hookup detection unit 280 is in the state of not detecting the hookup of the external telephone 106.

The line voltage acquisition unit 207 of the communication control unit 200 acquires the voltage of the line detected by the line voltage detection unit 233.

At this time, as shown in FIG. 13A, the external telephone 106 is connected to the line by the relay 250, and the DC loop is not formed by the DC loop forming unit 240.

S102: The communication control unit 200 determines whether or not the line is captured on the silicon DAA230 side, and if it is determined that the line is not captured (not facsimile communication), the process shifts to S103 and the line is captured (facsimile). If it is determined that it is communication), the process shifts to S117.

S103: The external telephone hookup determination unit 206 of the communication control unit 200 determines whether or not the external telephone 106 has been hooked up by the output from the external telephone hookup detection unit 280, and has not been hooked up. If it is determined, the process is transferred to S102, and if it is determined that the hook is hooked up, the process is transferred to S104.

When the external telephone 106 is hooked up, as shown in FIG. 13B, the external telephone 106 is connected to the line by the relay 250, and the DC loop forming unit 240 does not form the DC loop. Therefore, the exchange and the external telephone 106 are energized.

S104: The DC loop forming instruction unit 203 instructs the DC loop forming unit 240 to form a DC loop of the line in order to capture the line on the silicon DAA 230 side, and the DC loop forming unit 240 forms the DC loop of the line. To capture the line.

At this time, as shown in FIG. 13 (c), the DC loop is formed by the DC loop forming unit 240. The external telephone 106 is connected to the line by the relay 250, and the exchange and the external telephone 106 are energized.

S105: In order to disconnect (disconnect) the external telephone 106 from the line, the relay control unit 205 instructs the relay drive circuit 270 to turn on the relay 250, drives the relay 250, and disconnects the external telephone 106 from the line. ..

At this time, as shown in FIG. 13D, the external telephone 106 is disconnected from the line by the relay 250 while the DC loop is formed by the DC loop forming unit 240.

S106: When the external telephone 106 is disconnected from the line and the line is captured only on the silicon DAA230 side, the line voltage acquisition unit 207 acquires the line voltage from the line voltage detection unit 233 and also the line current acquisition unit 208. Acquires the line current from the DC loop forming unit 240. The switch side resistance value calculation unit 209 calculates the resistance value on the switch side based on the line voltage acquired in S101, the line voltage acquired by the line voltage acquisition unit 207, and the line current acquired by the line current acquisition unit 208. ..

S107: The exchange-side resistance value determination unit 111 of the host unit 110 determines whether or not the calculated resistance value on the exchange side is equal to or greater than the threshold value, and if it is determined to be equal to or greater than the threshold value, the process shifts to S112 and the threshold value is determined. If it is determined that it is less than, the process is shifted to S108.

S108: When the exchange side resistance value determination unit 111 of the host unit 110 determines that the resistance value on the exchange side is less than the threshold value, it determines that it is connected to an abnormal line, that is, connected to an exchange that causes an excessive current to flow.

S109: In order to disconnect the line captured on the silicon DAA 230 side, the DC loop forming instruction unit 203 stops the instruction to form the DC loop of the line to the DC loop forming unit 240, and the DC loop forming unit 240 stops the DC loop forming unit 240 to form the DC of the line. Release the loop formation. As a result, the line captured on the silicon DAA230 side is opened. At this time, the contact state of the relay 250 is maintained as it is, and the external telephone 106 is left disconnected from the line.

Here, the reason why the contact state of the relay 250 is kept as it is is that when the relay 250 is switched to the line side, the external telephone 106 and the external telephone hookup detection unit 280 again have an excessive line current. Is because it flows.

At this time, as shown in FIG. 13E, the relay 250 keeps the external telephone 106 disconnected from the line, and the DC loop forming unit 240 cancels the formation of the DC loop.

S110: In order to notify the user of the line abnormality, the abnormality warning notification unit 112 of the host unit 110 prints the fact that the line is abnormal on the print medium by the printing unit 105, and discharges it to the outside of the communication terminal device 102.

The contact state of the relay 250 in S111: S109 is held until the power of the communication terminal device 102 is turned off / on, and when the power is turned off / on, a series of processes is terminated and the process proceeds to S101.

S112: On the other hand, in S107, the switchboard side resistance value determination unit 111 of the host unit 110 that determines that the resistance value on the switchboard side is equal to or higher than the threshold value determines that the line is connected to a normal line.

S113: The relay control unit 205 instructs the relay drive circuit 270 to turn off the relay 250, turns off the relay 250, and connects the line to the external telephone 106.

At this time, as shown in FIG. 13 (f), the external telephone 106 is connected to the line by the relay 250. The exchange and the external telephone 106 are energized with the DC loop formed by the DC loop forming unit 240.

S114: The DC loop forming instruction unit 203 stops the instruction of forming the DC loop of the line to the DC loop forming unit 240, and the DC loop forming unit 240 releases the formation of the DC loop of the line and captures it on the silicon DAA 230 side. Disconnect the line.

At this time, as shown in FIG. 13 (g), the DC loop forming unit 240 forms a DC loop while the external telephone 106 is connected to the line by the relay 250 and the exchange and the external telephone 106 are energized. Is in the released state.

S115: The user can use the external telephone 106 and can make a call. For example, the user dials the other party on the external telephone 106 to talk to the other party.

S116: When the user turns on the external telephone 106 and ends the conversation, the line control unit 103 detects the on-hook of the external telephone 106, ends a series of processes, and shifts the process to S101.

At this time, as shown in FIG. 13 (h), the formation of the DC loop by the DC loop forming unit 240 is released, and the external telephone 106 is connected to the line by the relay 250. The exchange and the external telephone 106 are in a non-energized state.

As described above, in the processing of S101 to S116, the processing at the time of hook-up of the external telephone 106 described with reference to FIGS. 3 to 6 described above is performed.

S117: On the other hand, if it is determined in S102 that the line is being captured (facsimile communication) on the silicon DAA230 side, the relay control unit 205 disconnects (disconnects) the external telephone 106 from the line, so that the relay is relayed. The drive circuit 270 is instructed to turn on the relay 250, the relay 250 is driven, and the external telephone 106 is disconnected from the line.

At this time, as shown in FIG. 13 (i), the external telephone 106 is disconnected from the line by the relay 250 while the DC loop is formed by the DC loop forming unit 240.

S118: When the external telephone 106 is disconnected from the line and the line is captured only on the silicon DAA230 side, the line voltage acquisition unit 207 acquires the line voltage from the line voltage detection unit 233 and also the line current acquisition unit 208. Acquires the line current from the DC loop forming unit 240. The switch side resistance value calculation unit 209 calculates the resistance value on the switch side based on the line voltage acquired in S101, the line voltage acquired by the line voltage acquisition unit 207, and the line current acquired by the line current acquisition unit 208. ..

S119: The exchange-side resistance value determination unit 111 of the host unit 110 determines whether or not the calculated resistance value on the exchange side is equal to or greater than the threshold value, and if it is determined that the resistance value is equal to or greater than the threshold value, the process shifts to S120 and the threshold value is determined. If it is determined that it is less than, the process is shifted to S124.

S120: The switch side resistance value determination unit 111 of the host unit 110 that determines that the resistance value on the exchange side is equal to or higher than the threshold value determines that the line is connected to a normal line, and the line control unit 103 determines that the line control unit 103 is connected to a normal line. Send or receive).

S121: When the line control unit 103 determines that the facsimile communication is completed, the process shifts to S122.

S122: The relay control unit 205 instructs the relay drive circuit 270 to turn off the relay 250, turns off the relay 250, and connects the line to the external telephone 106.

S123: The DC loop forming instruction unit 203 stops the instruction to form the DC loop of the line to the DC loop forming unit 240 in order to disconnect the line captured on the silicon DAA 230 side, and the DC loop forming unit 240 stops the instruction of forming the DC loop of the line. Release the loop formation. As a result, the line captured on the silicon DAA230 side is opened, a series of processing is completed, and the processing is transferred to S101.

At this time, as shown in FIG. 13J, with the external telephone 106 connected to the line by the relay 250, the formation of the DC loop by the DC loop forming unit 240 is canceled, and the exchange and the external telephone 106 are separated. It will be in a non-energized state.

S124: On the other hand, in S119, the exchange side resistance value determination unit 111 of the host unit 110 that determines that the resistance value on the exchange side is less than the threshold value is connected to an abnormal line, that is, to a switch that causes an excessive current to flow. Judge.

S125: The relay control unit 205 instructs the relay drive circuit 270 to turn off the relay 250, turns off the relay 250, and connects the line to the external telephone 106.

S126: The DC loop forming instruction unit 203 stops the instruction to form the DC loop of the line to the DC loop forming unit 240 in order to disconnect the line captured on the silicon DAA 230 side, and the DC loop forming unit 240 stops the instruction of forming the DC loop of the line. Release the loop formation.

At this time, as shown in FIG. 13J, with the external telephone 106 connected to the line by the relay 250, the formation of the DC loop by the DC loop forming unit 240 is canceled, and the exchange and the external telephone 106 are separated. It will be in a non-energized state.

S127: In order to notify the user of the line abnormality, the abnormality warning notification unit 112 of the host unit 110 prints the fact that the line is abnormal on the print medium by the printing unit 105, and discharges it to the outside of the communication terminal device 102. As a result, a series of processes is completed, and the processes are transferred to S101.

In this way, in the processing of S101, S102, S117 to S127, the processing at the time of facsimile communication described with reference to FIGS. 7 to 10 described above is performed.

As described above, in the present embodiment, the line control unit 103 of the communication terminal device 102 detects that the line is not captured by the DC loop formation determination unit 204 and the external telephone hookup determination unit 206. The line voltage detection unit 233 detects the first line voltage (the line voltage acquisition unit 207 acquires the first line voltage), and the DC loop formation determination unit 204 or the external telephone hookup determination unit 206 captures the line. When it is detected, the line voltage detection unit 233 detects the second line voltage (the line voltage acquisition unit 207 acquires the second line voltage) while the line and the external telephone 106 are disconnected by the relay 250. ), And the line current acquisition unit 208 detects and acquires the line current, and the switch side resistance value calculation unit 209 shows it in FIG. 1 based on the first line voltage, the second line voltage, and the line current. When the resistance value of the switch 109 connected to the line 101a is calculated and an abnormality in the line is detected based on the resistance value, the line 101a and the external telephone 106 are disconnected to capture the line. It is possible to suppress the failure of the communication terminal device 102 and the external telephone 106 that occur in the above.

That is, before and after the line is captured by the external telephone 106, the resistance value on the exchange side is measured, and if the resistance value is less than the threshold value, it is determined that the line is connected to the line through which an excessive current flows, and the line is connected to the relay 250. By keeping the external telephone 106 disconnected, the external telephone 106 or the external telephone hookup detector when the resistance value of the exchange is smaller than the threshold value and the DC resistance of the external telephone 106 is small. It is possible to suppress the failure of the communication terminal device 102 due to the excessive current flowing through the 280.

Further, during facsimile communication (reception or transmission), the resistance value on the exchange side is measured before and after capturing the line on the silicon DAA230 side, and if the resistance value is less than the threshold value, it is connected to the line through which an excessive current flows. By making a determination and disconnecting the line, it is possible to suppress a failure of the communication terminal device 102 due to an overcurrent flowing to the silicon DAA 230 side.
Further, when an abnormality in the line is detected based on the resistance value of the exchange, the user is notified of the abnormality in the line, so that the failure of the communication terminal device 102 or the external telephone 106 can be prevented in advance.
In this embodiment, the abnormality warning notification unit 112 of the host unit 110 has been described as printing on a print medium to the effect that the line is abnormal in the printing unit 105 in order to notify the user of the line abnormality. A display unit such as a display may indicate that the line is abnormal, and the user may be notified of the line abnormality.

As described above, in the present embodiment, it is possible to obtain the effect of suppressing the failure of the communication terminal device or the telephone that occurs when the line is captured.
Further, by notifying the user of the abnormality of the line, it is possible to obtain the effect that the failure of the communication terminal device or the telephone can be prevented.
In this embodiment, the communication terminal device has been described as a facsimile device, but the present invention is not limited to this, and a multifunction device (MFP) or the like having a facsimile communication function may be used. Further, it may be a communication terminal device of a complex system in which a scanner and a printer are connected via a network.

101a line, 101b line network 102 Communication terminal device 103 Line control unit 104 Scanner unit 105 Printing unit 106 External telephone 107 Line terminal 108 Telephone terminal 109 Switch 110 Host unit 111 Switch side resistance value judgment unit 112 Abnormality warning notification unit 200 Communication control Part 201 FAX communication processing part 202 Ring detection judgment part 203 DC loop formation judgment part 204 DC loop formation judgment part 205 Relay control part 206 External telephone hookup judgment part 207 Line voltage acquisition part 208 Line current acquisition part 209 Switch side resistance value Calculation unit 210 Modem 220 Insulation delivery unit 230 Silicon DAA
232 Ring detector 233 Line voltage detector 240 DC loop forming unit 250 Relay 260 Diode bridge 270 Relay drive circuit 280 External telephone hookup detector

Claims (4)

In a communication terminal device having a facsimile communication function that is connected to an exchange via a line and can be connected to an external telephone.
A line voltage detector that detects the line voltage, and
The line current detector that detects the line current, and
A calculation unit that obtains the characteristics of the exchange connected to the line based on the voltage detected by the line voltage detection unit and the current detected by the line current detection unit.
A line capture detector that detects that a line has been captured,
A switching unit that switches the connection and disconnection between the line and the telephone,
A DC loop forming part that forms a DC loop with the line,
A line control unit that controls the line voltage detection unit, the line current detection unit, the calculation unit, the line capture detection unit , the switching unit , and the DC loop forming unit .
Have,
The calculation unit is a resistance value calculation unit that calculates the resistance value of the exchange.
The line capture detection unit is a hookup detection unit that detects the current from the line and detects the hookup of the telephone.
The hookup detection unit detects the current from the line and detects the state in which the line is captured.
The line control unit
In a state where the hookup detection unit detects that the hookup has not been performed, the line voltage detection unit detects the first line voltage.
When the hookup is detected by the hookup detection unit, the DC loop forming unit forms a DC loop, and the line voltage detecting unit disconnects the line from the telephone by the switching unit. Is detected, and the line current is detected by the line current detection unit.
The resistance value of the switch is calculated by the resistance value calculation unit based on the first line voltage, the second line voltage, and the line current.
A communication terminal device characterized in that when an abnormality in a line is detected based on the resistance value, the line and the telephone are disconnected. In the communication terminal device according to claim 1 ,
The line control unit
A communication terminal device characterized in that when the resistance value is less than a threshold value, it is determined that the device is connected to an abnormal line. In the communication terminal device according to claim 1 or 2 .
The line control unit
A communication terminal device characterized in that when it is determined that the user is connected to an abnormal line based on the resistance value, a warning output of the line abnormality is performed. The communication terminal device according to any one of claims 1 to 3 .
The resistance value calculation unit is
A communication terminal device characterized in that the resistance value is calculated by a calculation formula of resistance value = (the first line voltage-the second line voltage) / the line current.

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