JPH05130264A - Terminal equipment - Google Patents

Abstract

PURPOSE:To provide the terminal equipment usable as a telephone set without using a backup power supply even at power failure. CONSTITUTION:A power supply monitor circuit 114 always monitors a commercial power supply to output a power failure detection signal at power failure and to detect a power failure of the commercial power supply. Feeding circuits 106, 113 receive the said power failure detection signal to use power supply supplied respectively from an ISDN line 115 and a PSTN line 112 to supply power to a CPU 100, an operation section 107, an NCU 111, a ROM 101, a control section 103, a handset 104 and an ISDN interface section 105. Thus, the power supply is switched from the commercial power supply into the feeding power at a power failure and the terminal equipment acts like a digital telephone set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal device such as a facsimile device connected to an ISDN line.

[0002]

2. Description of the Related Art In recent years, integrated service digital network (ISD)
N) is being introduced rapidly. With the introduction of this ISDN, digital lines are being used, and as terminal devices connected to these digital lines, those that can be connected to both ISDN lines and PSTN lines are beginning to be marketed. This type of terminal device has an excellent feature that it can utilize a huge amount of existing equipment and avoid changing a telephone number due to the introduction of ISDN.

On the other hand, with the introduction of ISDN, there is an increasing need for the user side to manage the line usage charges of a plurality of terminal devices that use the ISDN. Conventionally, when a plurality of terminal devices share one ISDN line and use it, the user:
Each terminal device collects and manages line usage fees,
In addition, the network provider charges a line usage fee on a line-by-line basis, and a system having a plurality of ISDN lines manages each line.

[0004]

However, the above-mentioned conventional terminal device has the following problems.

(1) Normally, in a terminal device with a telephone function that uses only a PSTN line, the dial function, the ringing function, and the off-hook detection function are operated by receiving power from the network even during a power failure, and the telephone function is Can work. However, in the above-described terminal device with a telephone function that can be connected to both the ISDN line and the PSTN line, since the digital telephone is used as the telephone, there is a problem that it cannot be used as a telephone during a power failure.

That is, in the terminal device using the ISDN line, it is necessary to operate the above-mentioned dial function, ringing function, and off-hook detection function in order to function as a telephone. Further, in order to operate these functions, it was necessary to operate the CPU system, the communication control unit, the interface unit and the like. However, at the time of power failure, there is a limit in power consumption only with the power supply supplied from the ISDN network, and the above CPU system, communication control unit, interface unit, etc. cannot operate, and the terminal device is used as a telephone. I couldn't.

Therefore, in order to solve this problem, it is conceivable to use a backup power supply to make up for the above-mentioned power shortage, but the backup power supply only functions for a short period of time, and the cost becomes high. , Could not be a fully satisfactory solution.

(2) When a plurality of terminal devices share one ISDN line for use, conventionally, line usage fees of the plurality of terminal devices are comprehensively displayed and centrally and automatically managed. I couldn't. Further, even in a communication system in which a plurality of ISDN lines are used, it is impossible to centrally and automatically manage the line use charges for each terminal device and each line only by managing the use charge for each line. It was

In view of the above conventional problems, the present invention can be used as a telephone without using a backup power source even in the case of power failure, and can also automatically and centrally manage the line usage charges for each terminal device and each line. The purpose is to provide.

[0010]

In order to achieve the above object, a first invention is a terminal device which can be connected to a digital line and an analog line and which has a telephone function section, in a power failure detection signal when a commercial power source fails. And a power supply means for supplying power for power supply respectively supplied from the digital line and the analog line to the telephone function unit based on the power failure detection signal.

In a second aspect of the present invention, in a terminal device which is connectable to a digital line and an analog line and has a telephone function section, power supply monitoring means for outputting a power failure detection signal when a commercial power source fails, and power is supplied from the analog line. And a power feeding means for feeding power to the analog telephone function circuit in the telephone function unit based on the power failure detection signal.

A third invention is the same as the second invention,
It is characterized in that the analog telephone function circuit has a first switch means for connecting the voice signal from the handset to the digital line side at the normal time and to the analog line side at the time of power failure.

In a fourth aspect based on the third aspect, the first switch means switches the voice signal to either one of a digital line and an analog line in a normal time, and connects the voice signal to an analog line during a power failure. The feature is that it is connected to a line.

In a fifth aspect based on the second and third aspects, the analog telephone function circuit detects off-hook and on-hook and outputs a hook detection signal corresponding to the hook detection means, and the hook detection signal. Secondly closing or opening the DC loop of the analog line based on
And a switch means of.

A sixth aspect of the present invention has an S interface section connected to the user network interface reference point S / T point of the ISDN line, and charges information sent from the exchange is fetched from the S interface section and charge management information is acquired. In the terminal device for displaying or printing as, the information storage unit for storing predetermined fee management information and the external information sent from a plurality of external terminals are monitored through the S interface unit, and the external information First storage of identification information for identifying each external terminal in the information storage unit
Storage control means and second storage control means for storing the billing information in the information storage part in association with the identification information stored in the information storage part.

A seventh invention is based on the sixth invention.
An information transmission unit for transmitting the charge management information stored in the information storage unit to the ISDN line side, and information transmission control means for transmitting the charge management information from the information transmission unit to a predetermined destination are provided. It is characterized by

An eighth invention is based on the seventh invention.
The information sending unit is configured to convert the fee management information stored in the information storage unit into image data or code data and send the image data or code data.

[0018]

In the first aspect of the invention, the power source monitoring means constantly monitors the commercial power source and outputs the power failure detection signal at the time of power failure to detect the power failure of the commercial power source. The power supply unit receives the power failure detection signal and supplies power to the telephone function unit using power supply power supplied from the digital line and the analog line. As a result, at the time of power failure, the power source is switched from the commercial power source to the power source for power supply, and the digital telephone function operates.

In the second to fifth inventions, when the power source monitoring means detects a power failure of the commercial power source, the power feeding means supplies the power for power feeding from the analog line to the analog telephone function circuit during the power failure. , Enables analog telephone function circuits. Further, the first switch means switches and connects the communication path to the analog line side. When the operator raises the handset in such a state at the time of power failure,
The hook detection circuit detects off-hook and the second switch means is closed. As a result, a DC loop is formed with the telephone exchange through the analog line. This allows
This device can be used as an analog telephone only during a power failure.

In the sixth invention, the first storage control means is
For example, the identification information for identifying the external terminal sent from the calling external terminal is stored in the information storage unit. Furthermore, the second
The storage control means stores the billing information in the information storage unit in association with the identification information stored in the information storage unit. As a result, the charge management information of the terminal device connected to the ISDN line is centrally stored in the information storage unit.

In the seventh and eighth inventions, the information sending control means controls the information sending section to send the fee management information stored in the information storage section to a predetermined destination via the ISDN line. At that time, the charge management information is converted into image data or code data and transmitted. This allows
The fee management information stored in the information storage unit can be exchanged with the external terminal.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of a first embodiment of a terminal device according to the present invention.

This terminal device is, for example, an ISDN network 115.
And a facsimile machine connected to the PSTN network,
CPU 10 for performing various calculations and controlling the operation of the entire apparatus
It has 0. The CPU 100 has a ROM 10 in which programs for various operations in the facsimile are stored.
1, a RAM 102 as a work area, a communication control unit 103 for controlling communication, and a handset 104 for converting voice into an electric signal or converting an electric signal into a voice.
And ISDN to interface with the ISDN line
The interface unit 105 is connected via a bus.

On the other hand, the ROM 101 and the control unit 10
3, a power supply circuit 106 is connected to the handset 104 and the ISDN interface unit 105. The power supply circuit 106 converts a voltage of about 40V sent from the ISDN line 115 by phantom power supply of four wires into a voltage of 5V by a switching regulator or the like, and switches from commercial power supply to ISDN network power supply at the time of power failure. Then, power is supplied to each circuit.

Further, in the CPU 100, an operation unit 107 for inputting an operation in a facsimile, a display unit 108 for displaying an operation instruction to the user and an apparatus state, and a document to be transmitted. A scanner 109 that optically reads the data and converts it into an electric signal, a printer 110 that outputs the received document on paper, and a PSTN line 112.
Is connected to the NCU 111 which controls the network via the bus.

These CPU 100, operation unit 107, NC
U111 is connected to the power feeding circuit 113. The power supply circuit 113 is a circuit that converts the power supply from the PSTN line 112 into 5V by a switching regulator or the like and supplies the power to each circuit. The power supply monitoring circuit 114 sends a control signal (power failure detection signal) to the power failure switching circuits 106 and 113 in the event of a power failure with respect to the commercial power supply, and controls the power supply from the commercial power supply to the power supply from the PSTN network. Circuit.

When a power failure occurs in the commercial power supply, the power supply monitoring circuit 114 detects the power failure. Then, the power supply monitoring circuit 114 outputs a control signal to the power failure switching circuits 106 and 113 in order to switch the power supply from the commercial power supply to the power supply from the line. The power supply circuit 10 that has received this control signal
6,112 is the voltage 40V (420m) supplied from the net.
(About W) is converted to 5V, and power is supplied to a circuit required to operate the facsimile apparatus as a digital telephone. That is, the power supply circuit 106 supplies power to the ROM 101, the communication control unit 103, the handset 104, and the ISDN interface unit 105, and the power supply circuit 11
3 is a CPU 100, an operation unit 107, and an NCU 111.
Power to.

As described above, in this embodiment, the ISDN line 115 is not used at the time of power failure without using the backup power supply.
The telephone function can be operated using the power supply powers respectively supplied from the PSTN line 112 and the PSTN line 112. As a result, the configuration of the present device can be simplified and emergency information can be transmitted by telephone for a long time in the event of a power failure.

FIG. 2 is a block diagram showing a schematic configuration of the second embodiment of the terminal device according to the present invention, and the elements common to the first embodiment are designated by the same reference numerals.

In the first embodiment, of the circuits operated by the commercial power source, only the circuits required for the digital telephone function are fed from the network to realize the digital telephone function. Among the circuits that perform
0 and the ROM 101 consume a large amount of power, it is conceivable that the digital telephone function may not operate when an element that consumes a large amount of power is used only by feeding power from the network. Therefore, in this embodiment, the one-chip microcomputer 120 that operates only during a power failure and supports only the digital telephone function is used. This microcomputer 120 operates only during a power failure, and stores a program necessary for operating the digital telephone function during a power failure.

When a power failure occurs, the power supply monitoring circuit 114 detects the power failure as in the first embodiment, and the power feeding circuits 106 and 112 supply the voltage of 40V supplied from the network.
(About 420 mW) is converted to 5 V, and power is supplied to a circuit required for operating the facsimile apparatus as a digital telephone. That is, the power supply circuit 106 supplies power to the microcomputer 120, the RAM 102, the communication control unit 103, the handset 104, and the ISDN interface unit 105, and the power supply circuit 113 supplies power to the operation unit 107. Then, the microcomputer 120 controls these supplied circuits.

FIG. 3 is a block diagram showing a schematic configuration of a third embodiment of the terminal device according to the present invention, FIG. 4 is a block diagram showing a schematic configuration of a telephone function unit of the terminal device of this embodiment, and FIG. FIG. 3 is a block diagram showing a schematic configuration of an analog telephone function circuit in the terminal device of this embodiment. In these drawings, the elements common to the first and second embodiments are designated by the same reference numerals.

This embodiment is different from the above embodiment in that FIG.
As shown in FIG. 7, the power feeding circuit 106 in the facsimile apparatus of the above embodiment is omitted, and a power feeding circuit 113A having a function different from that of the power feeding circuit 113 is provided.
It is configured so that it can be used as an analog telephone only when there is a power failure.

Further, FIG. 4 shows a telephone function section of the present facsimile apparatus, and includes a dialer 130, a telephone codec 131, an off-hook detection circuit (hook detection means) 1 in the figure.
32, modem 133 for G3, and analog switch 1
34 is provided in the communication control unit in FIG. Here, the dialer 130 uses the CCI during the touch-tone line.
The DTMT signal recommended by TT is transmitted, and the telephone codec 131 performs A / D conversion and D / A conversion of the signal, and adjusts the level of the audio signal from the handset 104. Further, the off-hook detection circuit 132
Sends off a control signal (hook detection signal) for detecting the off-hook and closing the PSTN line 112 without the intervention of the CPU 100 during a power failure. Analog switch 134
Switches and connects the signal from the ISDN line 115 or the PSTN line 112 to either the handset 201 side or the modem 208.

Switching circuit 113 during power failure shown in FIGS. 4 and 5.
a constitutes a part of the power supply circuit 113A in FIG. 3, and includes first and second switch means 113a− including relays and the like.
1,113a-2. First switch means 1
13a-1 is switch-controlled by a control signal (power failure detection signal at the time of power failure) from the power supply monitoring circuit 114, normally connects the call path from the handset 104 to the PSTN line 112 via the NCU 111, and at the time of power failure, the path path is codec. Connect to the ISDN line 115 via 131. The second switch means 113a-2 performs a P relay operation (generates a dial pulse) and a DC loop opening / closing operation.

That is, the power supply circuit 113A of FIG. 3 has a voltage of 40 V (420 mW) supplied from the network at the time of power failure, like the power supply circuit 113 in the first and second embodiments.
In addition to having a voltage conversion unit (not shown) consisting of a switching regulator or the like for converting the power level) to 5 V during a power failure, the power supply path is switched and connected to a circuit (analog telephone function circuit) required to operate as an analog telephone during a power failure, The 5V power is supplied to these circuits, and a power supply unit (not shown) having a function different from that of the power supply circuit 113 of the embodiment, and the above-described first and second switch means 113a-1 and 113a.
-2 and. An example of the structure of the analog telephone function circuit is shown in FIG.

In FIG. 5, the terminal portion 11 of the NCU 111
1a is provided with telephone connection terminals T1 and T2 and line connection terminals L1 and L2, of which terminals T1 and T2 are connected to the power failure switching circuit 113a and terminals L1 and L2 are P
It is connected to the STN line 112. Further, a CML relay 140 that switches between a telephone function and a facsimile function is connected between the terminals T1 and T2 and the terminals L1 and L2. The CML relay 140 is always connected to the terminals T1 and T2 when not energized to select the telephone function side, and selects the facsimile function side when energized.

Next, the operation at the time of power failure will be described.

When a power failure occurs in the commercial power supply, the power supply monitoring circuit 114 detects the power failure and outputs a control signal to the power supply circuit 113A to switch the power supply from the commercial power supply to the power supply from the line. The power supply circuit 113 which has received this control signal
The voltage conversion unit in A converts the voltage of 40 V (about 420 mW) supplied from the PSTN line 112 into 5 V, and at the same time, the power supply unit in the power supply circuit 113 A changes the PSTN line 112.
The power supply is switched to the power supply from the above and the voltage of 5 V is supplied to the analog telephone function circuit shown in FIG. That is, PSTN
The power supply from the line 112 is performed by the handset 104, the operation unit 107, the power supply monitoring circuit 114, the dialer 130, the power failure switching circuit 113a, the off-hook detection circuit 132, and the N.
It is performed for CU111. Furthermore, during a power failure, N
The CML relay 140 in the CU 11 is switched to the telephone function unit on the side of the terminals T1 and T2, and the first switch means 113a-1 in the power failure switching circuit 113a switches the call path from the handset 104 to the PSTN line 1 via the NCU 111.
Switch to 12 and connect.

As described above, the power for supplying power is supplied to the analog telephone function circuit, the CML relay 140 is switched to the telephone function section side, and the call path is also changed to the PSTN line 1.
When switched to the 12th side, the facsimile device can be used as an analog telephone in the event of a power failure.

When transmitting, first, the handset 104
Take and go off-hook. Then, the off-hook detection circuit 132 detects the off-hook, outputs a control signal to the second switch means 113a-2 in the power failure switching circuit 113a, and closes the second switch means 113a-2.
As a result, a DC loop is formed from the handset 104 via the second switch means 113a-2, the CML relay 140, and the PSTN line 112 with a telephone exchange (not shown), and a dial tone is sent from the telephone exchange.

When the operator hears this dial tone from the receiving section of the handset 104 and inputs the telephone number from the operating section 107, the dialer 130 dials the dial signal, and the dial signal is switched to the power failure switching circuit 113a and the terminal T1.
T2, CML relay 140, terminals L1, L2, and PS
It is sent to the telephone station via the TN line 112. At this time,
The dialer 130 is a DTM when the line is a push line.
When the dial line is used, the second switch means 113a-2 is opened / closed to disconnect the DC loop, and the pulse signal is sent. As a result, the call becomes possible.

At the time of reception, 16 Hz sent from the other party via the telephone exchange and the PSTN line 112
The ringer signal (not shown) sounds a ringer (not shown). As a result, when the operator raises the handset 104,
Similarly to the above, a DC loop is formed and a call is possible.

As described above, the power failure switching circuit 113a
The second switch means 113a-2 therein performs a P relay operation and a DC loop opening / closing operation. P relay operation is
Normally, the P relay provided in the NCU 111 is used, but the second switch means 113a-2 substitutes for the P relay only during a power failure. As a result, existing NCU
Power supply monitoring circuit 114 and power supply circuit 1 without modifying
By simply adding 13A, the facsimile apparatus of this embodiment can be used as an analog telephone only during a power failure.

The first switch means 113a-1 in this embodiment connects the call path to the ISDN line side during normal operation and connects to the PSTN line side during power failure. The configuration may be such that either one of the PSTN lines is switched and connected, and that the PSTN line is connected when a power failure occurs.

FIG. 6 is a block diagram showing a schematic configuration of a communication system showing a fourth embodiment of the terminal device according to the present invention.

The plurality of ISDN lines 210, 220 to 2n0 connected to the ISDN switch 200 are connected to the network end terminal devices 211, 221, 2n1 respectively, and the network end terminal devices 211, 221, 2n1 comply with the CCITT recommendation. User / network interface reference point S / T point 21
2, 222 to 2n2, respectively. Further, at the reference point S / T points 212, 222-2n2,
Multiple terminal devices 21 with S / T interface
3, 214, 223, 224 to 2n3, 2n4 are respectively connected. Each of the plurality of terminal devices has a reference
Up to 7 units are connected to each of the points 212, 222-2n2.

Further, each reference point S / T point 212, 222
FAX (facsimile machine) with charge management function 2
15, 225 are respectively connected, and in addition, the reference point S / T
The point 2n2 is connected to a personal computer 2n5 with a charge management function for managing the charge of the entire system.

FIG. 7 is a FAX with a charge management function in FIG.
It is a schematic block diagram showing an example of the configuration.

FAX 215,22 with this charge management function
5 includes a CPU 300 that controls the operation of the entire apparatus by performing arithmetic processing on the information transmission control means 300a.
The U300 includes a ROM 301 that stores various operation programs such as facsimile operation and charge management, a RAM 302 as a work area, a communication control unit 303 that controls communication, a charge management unit 304, an S interface 305, and an operation. A unit 306, a display unit 307 that displays charge management information, and a scanner 308 that reads a transmission image.
And the printer 309 are connected via a bus. The S interface 305 is connected to the ISDN switch 200 side via the ISDN line 310.

Here, the communication control unit 303 converts the charge management information from the charge management unit 304 into image data or code data and sends it when transmitting the charge management information to another terminal device. The charge management unit 304 includes an address area (information storage unit) 304a and first and second storage control units 304b and 304c. First and second storage control means 304b, 30
4 c monitors the information on the control channel of the reference point S / T point provided through the S interface circuit 305, and the information sent by another terminal device and the ISDN switch 2
00 manages line usage fee information (billing information) for each terminal device based on the information sent by
Remember. Further, in the CPU 300, the operator operates the operation unit 3
By operating 06, charge management information is displayed on the display unit 30.
7 is displayed, the printer 309 is caused to print, and the designated terminal device is caused to send the charge management information as image data or code data.

Next, in the communication system configured as described above, the operation will be described by taking as an example the case where the terminal device 214 makes a call.

When the terminal device 214 makes a call, the first charge management unit 304 in the FAX 215 with charge management device
The storage control means 304a monitors the message of the control channel on the reference point S / N point 212, and the terminal device 2
The calling subaddress (identification information of the calling terminal device) and the call number (information for identifying which call is controlled among a plurality of different calls) included in the call setup message sent from It is stored in the area 304a.
Further, at the end of communication of the terminal device 214, the charge management unit 3
The second storage control unit 304b of 04 is the ISDN line 2
The call number and line usage fee information sent from the exchange 200 via 10 are received, and the calling subaddress and the line usage fee information are obtained based on these information and the information in the call setup message stored previously. Correspondingly, the charge management unit 304
It is stored in the address area 304a corresponding to the calling sub-address. When the other terminal device 213 or the like makes a call, the same processing is performed, and each is stored in the address area 304a corresponding to the calling subaddress of each terminal device.

As a result, the FAX 21 with the charge management device is provided.
In the address area 304a of the charge management unit 304 of 5,
Terminal devices 213, 214 ... Connected to the line 210
The line usage charges of are stored in a centralized manner. When displaying, printing and sending out these line usage charges, the operator designates a desired operation from the operation unit 306 and displays the charge management information accumulated in the charge management unit 304 on the display unit 307. Alternatively, the printer 309 prints. Further, the FAX with other charge management function is used as the charge management information as image information.
When sending to 215, 225 ..., By operating the operation unit 306, the information sending control means 300a in the CPU 300.
The fee management information in the fee management unit 304 is read out by the function of, and the read fee management information is converted into image data by the information transmission unit 303a of the communication control unit 303 and transmitted.

In the present embodiment, the charge management of the entire system is performed by the personal computer 2n5 with charge management function.
Polling transmission is performed from the personal computer 2n5 to the FAXs 215, 225, ... With a charge management function installed for each line, the charge management information in the charge management unit 304 is received as code data, and these data are aggregated. Manages the system-wide charge for each terminal device and each line.

In the case of a communication system having a small number of lines, as described above, the FAX 21 with a charge management device is provided without providing the personal computer 2n5 as a charge management device.
, 225, ..., the fee management information can be transmitted as image data.
If the charge management information is exchanged between 5 ..., the charge management information for each line or each terminal device in the line can be aggregated as in the case of the personal computer 2n5, and it becomes possible to manage the charge of the entire system. ..

[0058]

As described above, according to the first aspect of the present invention, a terminal device that can be connected to a digital line and an analog line and has a telephone function section outputs a power failure detection signal when a commercial power source fails. Since it has a power supply monitoring means and a power supply means for supplying power for power supply respectively supplied from the digital line and the analog line to the telephone function unit based on the power failure detection signal, even during a power failure,
It is possible to operate the telephone function only by supplying power from the communication network without using a backup power supply. As a result, a terminal device that can talk for a long time during a power failure can be realized at low cost, and the terminal device can be effectively used even during a power failure.

A second aspect of the present invention is, in a terminal device which is connectable to a digital line and an analog line and has a telephone function section, and a power supply monitoring means for outputting a power failure detection signal at the time of a power failure of a commercial power supply, and a power supply from the analog line And a power feeding means for feeding power to the analog telephone function circuit in the telephone function unit on the basis of the power failure detection signal. The third invention is the analog telephone function according to the second invention. The circuit has a first switch means for connecting the voice signal from the handset to the digital line side at the normal time and also to the analog line side at the time of power failure, and the fourth invention is the third invention. In the normal mode, the first switch means switches and connects the audio signal to either one of a digital line and an analog line, In the fifth and third inventions, the analog telephone function circuit detects off-hook and on-hook and outputs a hook detection signal corresponding to the off-hook and the on-hook. Since the hook detection means and the second switch means for closing or opening the DC loop of the analog line based on the hook detection signal are provided, the second switch means is provided.
The fifth invention can be used as an analog telephone that can operate with low power consumption at the time of power failure, and has the same effect as the first invention.

According to a sixth aspect of the present invention, an information storage unit for storing predetermined charge management information and external information sent from the external terminal are monitored through the S interface unit, and the external terminal in the external information is monitored. First storage control means for storing identification information for identification in the information storage portion, and second storage control means for storing billing information in the information storage portion in association with the identification information stored in the information storage portion. Since the information storage unit is provided with, the charge management information of the terminal device connected to the ISDN line is stored in a unified manner. As a result, in a communication system in which a plurality of terminal devices share one ISDN line and use it, the charge management information of each terminal device can be centrally and automatically managed.

A seventh invention is based on the sixth invention.
An information transmission unit for transmitting the charge management information stored in the information storage unit to the ISDN line side, and information transmission control means for transmitting the charge management information from the information transmission unit to a predetermined destination are provided. According to an eighth invention, in the seventh invention, the information transmission unit is configured to convert the fee management information stored in the information storage unit into image data or code data and transmit the image data or code data. According to the eighth aspect, it is possible to exchange the fee management information stored in the information storage unit with the external terminal. This allows ISDN
Even in a communication system in which a plurality of lines are used, it is possible to centrally and automatically manage the charge information for each line or each terminal device. Therefore, multiple ISDN
In a communication system having a line, regardless of the size of the system, a charge management system adapted to the communication system can be easily constructed depending on the scale, cost, installation location, etc. of the system.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a first embodiment of a terminal device according to the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a second embodiment of a terminal device according to the present invention.

FIG. 3 is a block diagram showing a schematic configuration of a third embodiment of a terminal device according to the present invention.

FIG. 4 is a block diagram showing a schematic configuration of a telephone function unit of the terminal device of the second embodiment.

FIG. 5 is a block diagram showing a schematic configuration of an analog telephone function circuit in the terminal device of the second embodiment.

FIG. 6 is a block diagram showing a schematic configuration of a communication system showing a fourth embodiment of the terminal device according to the present invention.

FIG. 7 is a schematic block diagram showing a configuration example of a FAX with a charge management function in FIG.

[Explanation of symbols]

 104 Handset 106,112 Power Supply Circuit 113 PSTN Line 114 Power Supply Monitoring Circuit 115 ISDN Line 113a-1 First Switch Means 113a-2 Second Switch Means 132 Off-hook Detection Circuit 212,222,2n2 S / T Point 300a Information Transmission Control Means 303a Information sending unit 304a Address area 304b, 304c First and second storage control means 305 S interface unit 307 Display unit 309 Printer

Claims (8)

[Claims] 1. A terminal device, which is connectable to a digital line and an analog line and has a telephone function unit, supplies power supply monitoring means for outputting a power failure detection signal when a commercial power source fails, and supplies from the digital line and the analog line, respectively. And a power supply unit that supplies power to the telephone function unit based on the power failure detection signal. 2. A terminal device which is connectable to a digital line and an analog line and which has a telephone function section, and a power supply monitoring means for outputting a power failure detection signal at the time of a power failure of a commercial power supply; A terminal device, comprising: a power supply unit that supplies power to an analog telephone function circuit in the telephone function unit based on the power failure detection signal. 3. The analog telephone function circuit has a first switch means for connecting a voice signal from the handset to the digital line side during normal operation and to the analog line side during a power failure. The terminal device according to claim 2. 4. The first switch means is configured to switch and connect the voice signal to one of a digital line and an analog line at a normal time and to connect to an analog line at the time of power failure. The terminal device according to claim 3. 5. The analog telephone function circuit detects hook-off and on-hook and outputs a hook detection signal corresponding to the hook detection means, and closes or opens a DC loop of the analog line based on the hook detection signal. The terminal device according to claim 2 or 3, further comprising: 6. An SDN unit having an S interface unit connected to a user network interface reference point S / T point of an ISDN line, the accounting information sent from an exchange is fetched from the S interface unit and displayed or printed as charge management information. In this terminal device, an information storage unit for storing predetermined fee management information and external information sent from a plurality of external terminals are monitored through the S interface unit, and each external terminal in the external information is monitored. First storage control means for storing identification information for identification in the information storage portion, and second storage control for storing the billing information in the information storage portion in association with the identification information stored in the information storage portion. And a terminal device. 7. An information sending unit for sending the charge management information stored in the information storage unit to an ISDN line side, and information sending control for sending the charge management information from the information sending unit to a predetermined destination. 7. The terminal device according to claim 6, further comprising: 8. The terminal device according to claim 7, wherein the information sending unit is configured to convert the fee management information stored in the information storage unit into image data or code data and send the image data or code data.