JPS6319957A - Facsimile communication system - Google Patents

Abstract

PURPOSE:To realize the application of a shared facsimile equipment by adding functions to the facsimile equipment to detect and convert a specific signal and to transmit an answer signal in response to the state of a connection circuit. CONSTITUTION:When an incoming call is received from a facsimile communication F network 1 during the communication secured between a FAXC and a FAXB, a circuit II is connected to a MODEM device 3201 via a route of a circuit connection part 3111, a switch 3112, a DC holding circuit 3113 and a circuit switch part 3104. Thus the picture signals are transmitted to the FAXC from the FAXB via an exclusive network 2. Here a call signal detecting circuit 3126 which detects call signal received form the F network 1 is added together with an answer signal transmitting function 3120 which transmits an answer signal to the F network 1. Thus an incoming answer control sequence led form the network 1 opens a DC loop after closing it temporarily when an incoming call is received from the network 1. Thus the FAXC can easily have facsimile communication with both networks 1 and 2 with no change of the network 1.

Description

[Detailed Description of the Invention] [Summary] A facsimile communication system having a facsimile device that competitively controls incoming calls from different communications m (for example, facsimile communication networks), the facsimile device having a specific signal detection function and a response signal. Adds both the sending function and the sending function.

In this way, the facsimile device can smoothly perform facsimile communications from both its own dedicated network and the different communication networks mentioned above.

[Industrial Application Field] The present invention relates to a facsimile communication system, and for example, to a communication system for a facsimile device (facsimile terminal) that connects to both a facsimile communication network and a dedicated network.

Facsimile communication has the ability to compensate for the essential deficiencies of telephones, and is a communication system that has a high possibility of becoming the next generation of mass communication.However, in order to make facsimile communication general-purpose, it is necessary to A system that allows easy communication with other networks is desirable.

[Prior art] The facsimile communication network mentioned above is the facsimile communication network defined in the terms and conditions of the facsimile communication network service of Nippon Telegraph and Telephone Corporation (NTT). This is abbreviated as F network and will be explained using an example in which a different communication network is F network.

In conventional facsimile (FAX) communications, the facsimile communication network service provided by NTT was only able to communicate with facsimile machines (FAX terminals; including FAX center equipment) contracted with F-class, and could only communicate with other dedicated M4 (private branch exchanges). Communication with networks (such as networks) was not possible due to institutional constraints. Therefore, when the destination to which the message is to be sent is connected to a dedicated network, there is an inconvenience in that the sending side must prepare two types, one for FMi4 and one for the dedicated network.

Figure 3 shows the previous system configuration, where l is F network and 10 is a FAX terminal (FAXA) connected to F network 1.
), 2 is a dedicated network, and 20 is a FAX terminal (FAXB) connected to the dedicated network 2. As shown in the figure, there is no connection between the two sets, and mutual communication is not possible.

However, this system has been revised and the technical standards
F network provider if technical conditions are met.

Communication between different entities such as dedicated network providers has become possible.

Figure 4 shows the revised system configuration.
0 connects to both networks (FAX C
). However, even if the conventional FAXC 30 is connected to both the F network and the private network, there is a problem in that it cannot function satisfactorily.

[Problems to be solved by the invention] Figure 5 shows the line interface 31 of a conventional FAXC 30.
1 shows the internal configuration of the modulation/demodulation device and the control section 32.

In the figure, line 411 is line 0 connected to F line 1.
is a line connected to the dedicated network 2, 3101 and 3111 are line connection parts, 3102 and 3112 are switching parts (connection parts of calling signal detection circuits 3106 and 3116), 310
3.3113 is a DC holding circuit, 3104 is a line switching unit (line ■ or connection switching unit between line ■ and modem device 3201), 3106°3116 is a calling signal detection circuit (
Ink ringing detection circuit'), 3107.311
7 indicates a DC loop holding drive circuit. Also, 320
1 is a modulation/demodulation device, and 3202 is a DC loop holding drive control circuit.

As shown in the figure, the conventional FAXC30 is equipped with a paging signal detection function (in-ringing detection function with a ringing signal wavelength of 16H2) and an incoming call contention control function in order to achieve mutual communication between the subscriber telephone network and the dedicated network. network (subscriber telephone network is F
(lower network) and the dedicated network. Then, if FAX C is idle, it can communicate with any network. However, if there is an incoming call from network F while communicating with dedicated network 2, there is no response function for that incoming call, so even if you connect as shown in the system configuration diagram in Figure 4, you will not be able to communicate. happens.

The present invention provides a facsimile communication system that solves these problems and facilitates facsimile communication between the F network and the dedicated network.

[Means for solving the problem] The purpose is to provide a facsimile machine that has multiple connection lines, including connection lines to different communication networks (for example, F network), and that controls competition for incoming calls from different communication networks. This is achieved by a facsimile communication system in which the facsimile device is added with a function of detecting and converting a specific signal, and a function of sending a response signal according to the state of the connection line.

[Function] That is, the present invention provides, for example, a function of detecting a signal from the F network to a FAX C having a plurality of connection lines between Fl and a dedicated network, and a function of sending a response signal to the F network. Add. The FAXC network control mechanism already has a mutual line switching function between a subscriber telephone line and a dedicated line, but both of the above functions will be added to it. In this way, PAX C can easily perform facsimile communications from both the dedicated network and the F network.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an internal configuration diagram of a line interface 31, a modulation/demodulation device, and a control section 32 of FAX C according to the present invention. In the figure, 3120 is a response signal sending circuit (FAX
Response signal sending circuit using C), 3121.31
22 is an OR circuit, 3126 is a calling signal detection circuit (F
(Circuit for detecting a call signal from the network), and other symbols are the 5th
Identical parts in the figures are given the same symbols. Here, the calling signal from the F network has a wavelength of 1300H2, and
ii is an upper network of the subscriber telephone network including a store-and-forward unit (STOC).

As shown in FIG. 1, the system configuration according to the present invention includes an Il function for detecting a paging signal from the F network (paging signal detection circuit 3126) and a response signal sending function to the F network (response signal control circuit 3120). With this configuration, even if FAX C receives a call from Fy4 while communicating through the dedicated network, it will be able to communicate with network F once communication with the dedicated network is completed.

Referring to FIG. 1, the operation when an incoming call is received from network F while FAXC is communicating with FAXB on the dedicated network will be described. In that case, the line ■ and the modem 3201 are connected to the line connection section 3111. Switching section 3112. DC holding circuit 3113,
It is connected via the route of the line switching unit 3104, and image signals are transmitted from FAXB to FAXC via the dedicated network 2. That is, the circuit of the switching unit 3112 operates, the calling signal detection circuit 3116 is disconnected from the line (2), the DC holding circuit 3113 is connected with high impedance in AC, and the line switching unit 3104 causes the modem 3201 to connect to the line. ■It is connected to. In this state, when there is an incoming call from network F 1, a calling signal is sent to FAX C through line vAI, but at that time, switching unit 3102 is in the recovery state and the line! is connected to the calling signal detection circuit 3126. Calling signal detection circuit 3
When there is an output of 126, the output signal of the DC loop holding drive circuit 3117 of the line ■ is monitored, and the logical product with the calling signal detection signal is performed to identify that the line ■ is connected to the modulation/demodulation device 3201 and is in use. and response signal sending circuit 312
0 to send out a response signal.

The response signal sending circuit 3120 uses an internal timer (second
(see figure; the operation of the timer will be described later), and operates the switching section 3102 to activate the calling signal detection circuit 31.
26 from line I, and the DC loop holding drive circuit 3
107 via the OR circuit 3121, the DC holding circuit 3103 is operated, and a DC loop is created between the two wires of the line (2). Therefore, a primary response signal is sent from FAXC to F network 1.

When the timer operates and a predetermined time has elapsed, a recovery signal is sent to the DC loop holding drive circuit 3107 via the OR circuit 3121. DC loop holding drive circuit 310
7 is restored, and therefore, the DC holding circuit 3103 is also restored. On the F network 1 side, after a while, the call is made to FAXC again, but if the communication has ended at that time, the DC holding circuit 3113 and switching section 3112 have been restored, and the modem 3201 is now free. PAX C works as an incoming call.

Next, FIG. 2 shows an internal configuration diagram of the response signal sending circuit 3120, in which 20a is an AND circuit, 20b is an inverter circuit, 20C is a counter, and 20d is an OR circuit.

20f is a flip-flop. To explain the operation of the timer using the same diagram, FAX C is FAX B on a dedicated network.
The DC loop holding drive circuit 3117 is operating while communicating with
When the signal is sent to C, the calling signal detection circuit 3126 operates, and the AND circuit 20a in the response signal sending circuit 3120 performs a logical AND operation, and after the flip-flop 2Of is reset by the output signal of the inverter 20b, it is set. be done. The output signal passes through the OR circuit 3121 and operates the DC loop holding drive circuit 31o7. On the other hand, the set signal starts the counter 20c, and when it counts up to a predetermined value, it outputs a signal and returns to the initial state.

The output signal of the counter 20c resets the flip-flop 2Of via an OR circuit 20d. Therefore, the DC loop holding drive circuit 3107 is restored after a predetermined timing.

Note that the ringing signal detection circuit 3106 operates in response to an incoming call from the subscriber telephone network, and the incoming call that is currently communicating with any line is controlled by the DC loop holding drive control circuit 3202. 3107 and 3117 are not operated. Therefore, no response signal is sent to the subscriber telephone network or dedicated network that received the call, and this series of operations is based on the conventional method of controlling switching between the subscriber telephone network and the dedicated network. .

Next, the operation when FAX C receives a call from the dedicated network while communicating with FAX A of F network will be described.

In this case as well, the operation is performed in accordance with the above operation, but at that time, the line I and the modem 3201 are connected to the line connection section 310.
1. Switching section 3102. DC holding circuit 3103. Connected via the line switching unit 3104 route, FAX A to FA
An image signal is being transmitted to XC via F4M1, and the circuit of the switching unit 3102 is activated to disconnect the calling signal detection circuits 3106 and 3126 from the line I, and the DC holding circuit 3103 is switched to the AC state. is connected to the line (2) with high impedance, and the modem 3201 is connected to the line (2) by the line switching unit 3104.

In this state, when a call is received from the dedicated network 2, a paging signal is sent to FAX C through the line ■, but at that time, the switching unit 3112 is in the recovery state, and the line ■ is sent to the paging signal detection circuit 3116. It is connected. When there is an output from the calling signal detection circuit 3116, the line I is switched to the modem 23 within the DC loop holding drive control circuit 3202 of the line vAI.
201 and is in use, the DC loop holding drive control circuit 3202 does not drive the DC loop holding drive circuit 3117, and the DC holding circuit 3113 does not operate. Does not send response signal.

These controls are the same as the controls when a call is received from the dedicated network during communication with the subscriber telephone network, and are based on conventional control methods.

On the dedicated 'fi42 side, the switch in the network or the F on the originating side
AX B identifies that the called party's FAX C is in use, and after a while, makes the call again. When the FAX C communication is completed, the DC holding circuit 3103 and switching unit 31O
2 will be restored and FAX C will be free.

Next, line 1. An explanation will be given of the operation when a call is received on line I while line I is idle.In that case, a ringing signal is input to the ringing signal detection circuit 3126 via the switching unit 3102, but the response signal is not sent. circuit 3120
Since the state information of the DC loop holding drive circuit 3117 of the line (2) is in the recovery state, the modem 3201 identifies that the line (2) is not in use and does not operate, and performs normal incoming call response control operations. That is, the DC loop holding drive control circuit 3
202 operates the DC loop holding drive circuit 3107 via the OR circuit 3121, and operates the DC holding circuit 3103. Therefore, a response signal is sent to the F network 2.

The subsequent operations are performed according to communication control means for a normal facsimile communication network. Line 1. The operation is similar when a call is received on line (2) while both lines (n) are idle.

As described above, the present invention provides a FAXCO network control function section that has a mutual line switching function between a subscriber telephone line and a dedicated line.
This function adds a function to detect calls from the network and send a response signal to the F network, and the control sequence for responding to incoming calls from the F network during communication with the dedicated network temporarily closes the DC loop as described above. Use the method of releasing it later. In this way, you can add simple functions without changing the F network side.
AX C can easily communicate by facsimile with either of the two groups.

The above is an example in which functions are added to the steel control section in FAX C, but there are also other functions added to the main control section (CP
It is also conceivable to have a configuration in which U) is assigned some of the functions.

Further, although the above example is an example of an F network and a dedicated network, it goes without saying that the present invention can also be applied to the case of different communication networks such as a dedicated network and a dedicated network.

[Effects of the Invention] As is clear from the description of the embodiments above, according to the present invention, a common facsimile machine (F
AXC) can be used, and an economical facsimile communication system can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a device configuration according to the present invention, FIG. 2 is a detailed diagram of a response signal transmission path, FIG. 3 is a diagram of a conventional facsimile communication system, and FIG. 4 is a diagram of a facsimile communication system related to the present invention. FIG. 5 is a block diagram of a conventional device. In the figure, l is the facsimile communication network (F network), 2 is the dedicated network, FAX A is the facsimile machine connected to FM4, FA
XB is a facsimile machine connected to a dedicated network, FAX
C is a facsimile machine connected to both, line I is F silk 1
3101, 3111 are line connection parts, 3102, 3112 are switching parts, 3103, 3113 are DC holding circuits, 3104 is line switching part, 3106, 3116 are calling signals detection circuit, 3107,
3117 is a DC loop holding drive circuit, 3201 is a modem, 3202 is a DC loop holding drive control circuit, 3120 is a response signal sending circuit (response signal sending circuit when using FAXC), 3121 and 3122 are OR circuits, 3126 is a calling circuit. Signal detection circuit (Call signal detection circuit from Fy4) List 1
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＞Stem Diagram 4

Claims (1)

[Claims] A facsimile communication system comprising a facsimile device having a plurality of connection lines including a connection line to a facsimile communication network and controlling incoming calls from the facsimile communication network in a competitive manner, the facsimile device receiving a specific signal from the facsimile communication network. What is claimed is: 1. A facsimile communication system comprising: means for detecting a facsimile communication network; and means for transmitting a response signal according to the state of a connection line to a facsimile communication network.