JPH0461460A - Facsimile equipment/modem automatic changeover device - Google Patents

Abstract

PURPOSE:To execute unattended automatic changeover between a facsimile equipment and a MODEM by selecting a telephone line to the position of the MODEM so as to allow the MODEM to process an incoming call when it is judged that the equipment of an opposite station is not a facsimile equipment based on a reply signal from the opposite station. CONSTITUTION:A changeover circuit 11 normally connects a telephone line 13 and a facsimile equipment 15. An automatic changeover control circuit 16 monitors the communication between a facsimile equipment 15 of its own station and an opposite station when a call comes to the facsimile equipment 15 thereby monitoring a reply signal from the opposite station with respect to a connection protocol signal sent from the facsimile equipment 15 of its own station. The circuit 16 detects the presence of a prescribed reply signal and sends a control signal to the changeover circuit 11 when it is identified that the equipment of the opposite station is not a facsimile equipment to switch the circuit 11 to the position of a MODEM 18 through the connection of a telephone line terminal 12 and a MODEM connection terminal 17. Thus, the telephone line is switched automatically unattendedly to a required device.

Description

[Detailed Description of the Invention] [Industrial Application Fields] The present invention is directed to automatic switching between a modem (data modem) used for data communication via a telephone line and a facsimile connected to the same telephone line. The present invention relates to an automatic facsimile/modem switching device that performs

It is also possible to configure this automatic switching device as a modem with a facsimile identification function, in which the automatic switching device is built into the modem and the facsimile is attached externally, or as a facsimile with a modem identification function, in which the automatic switching device is built in the facsimile and the modem is attached externally.

[Prior Art] Conventional modems do not have a function to identify a facsimile machine because it is not assumed that the other party via a telephone line is a facsimile machine.

By the way, with the spread of facsimiles, the demand for data communication using modems is also increasing.

Systems have come to be constructed in which a facsimile and a modem are connected to one telephone line, and manual switching enables one normal telephone, facsimile, or data communication.

FIG. 4 is a block diagram showing an example of such a system configuration.

In the figure, a conventional modem 23 and facsimile 24 are connected to one telephone line terminal 22 via a two-line switching device 51. It should be noted that here, the same effect can be obtained even if the telephone 25 is connected to the modem 23 or the telephone 25 is connected to the facsimile 24 side.

Here, the modem 23 and facsimile 24 are connected in advance.
We will explain the incoming call operation when the incoming call setting is set manually. In that case, the manual line switching device 5
1 is set on the modem 23 side to which the telephone 25 is connected.

When a calling signal is input from the telephone line terminal 22, the modem 2
3 and facsimile 24 do not detect an incoming call, and telephone 2
5 detects it and generates a ring tone. The called party who answers the call talks to the other party and determines whether the other party is using a telephone, modem, or facsimile.
Thereafter, the telephone line is switched to the corresponding device using the line switching device 51.

[Problems to be Solved by the Invention] Even if the conventional modem 23 is set to the automatic call receiving mode, it does not have a function to identify that the other party is a facsimile machine from the detection of a ringing signal, so it is not possible to manually receive a call as described above. It was necessary to check the other station in the mode. Note that even in the facsimile's automatic incoming call mode, automatic switching with the modem is not performed.

Therefore, in the system configuration shown in FIG.

It was essential that there be someone present to operate the line switching device 51. Furthermore, in order to respond unattended, it was necessary to have a meeting with the other party in advance, switch the single-line switching device 51 to the corresponding device, and set it to automatic call receiving mode.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic facsimile/modem switching device that can automatically identify whether the other party is a modem or a facsimile and automatically switch the telephone line to the corresponding device. do.

[Means for Solving the Problems] According to the present invention, there is provided a facsimile/modem automatic switching device that automatically switches a connection to a telephone line from a facsimile to a modem, the facsimile/modem automatic switching device automatically switching a connection to a telephone line from a partner device connected to the telephone line to the facsimile. monitor the response signal to
an automatic switching control circuit that outputs a control signal when it is determined as a result of the monitoring that the other party's device is not sending a facsimile;
A facsimile machine/facsimile machine comprising: a switching circuit that normally connects the telephone line to the facsimile machine; and a switching circuit that connects the telephone line to the modem in response to the control signal.
An automatic modem switching device is obtained.

The effect FIG. 1 is a block diagram showing the basic configuration of the present invention.

In the figure, a switching circuit 1 has a normal common contact connected to a break contact, and connects a telephone line 13 connected to a telephone line terminal 12 and a facsimile connected to a facsimile connection terminal 14. There is.

When the facsimile 15 receives a call, the automatic switching control circuit 16 monitors the communication between the facsimile 15 of its own station and the other station, and detects the response from the other station to the connection procedure signal sent from the facsimile 15 of its own station. Monitor signals.

Here, the presence or absence of a predetermined response signal is detected, and when it is determined that the other party is a non-fax machine, a control signal is sent to the switching circuit 11 to connect the telephone line terminal 12 to the modem connection terminal 17. Switch to connection to modem 18.

The facsimile machine 15 shown in FIG. 2 is a Group 3 machine as recommended by CCITT, and the automatic switching control circuit 16 has a 300 bit/300 bit/bit speed that corresponds to the binary control means of the Group 3 machine.
The following description assumes that the computer is equipped with a modem. Therefore, communication between the facsimile 15 of the local station and the other station can be monitored via the modem, and a predetermined connection procedure signal of the other station can be received within a predetermined time in response to a predetermined connection procedure signal sent from the own station. If it is not detected, it can be detected that the other party's station is a non-facsimile machine.

[Embodiment] Hereinafter, an embodiment of the present invention will be described in detail based on one drawing.

FIG. 2 shows an automatic switching control circuit 1 according to an embodiment of the present invention.
FIG. 6 is a block diagram showing 6.

9 In this embodiment, the automatic switching control device of the present invention is built into the modem used for data communication, and the terminal to which a telephone is conventionally connected is used as the GmFAX connection terminal;
An example of a configuration in which m-facsimile machines (group 3 machines recommended by CCITT) are externally attached is shown below.

In FIG. 2, a telephone line terminal 22 is connected to the common contact of the switching circuit 21, and a transformer 2 is connected to the make contact.
Transmitter 27 and receiver 28 as modem via 6
are connected in parallel, and the GmFAX connection terminal 29 is connected to the break contact. Further, a 300 bit/s modem 32 is connected to the break contact of the switching circuit 21 via a transformer 3, and its output is connected to an input terminal of a control circuit 33. Furthermore, a monitoring timer circuit 34 is connected to the control circuit 33, and the output of the control circuit 33 is transmitted to the switching circuit 2].
connected to the switching control terminal. Further, a calling signal detection circuit 35 is connected to the common contact of the switching circuit 21, and its output is connected to the activation control terminal of the monitoring timer circuit 34.

Note that the input of the transmitter 27 is connected to the transmission terminal 41. A data terminal is externally connected using the output of the receiver 28 as a receiving terminal 42.

Further, an external GIII facunmill 45 is connected to the GmFAX connection terminal 29.

Here, the GIII facsimile connection control procedure will be briefly explained. The GIII facsimile uses a modem to execute binary control procedures that perform various controls using digital codes. GIII facsimile generally uses a half-duplex modem that can switch between 4800 and 2400 bits/s, but when connected to a general telephone network, it has an additional 300 bits/s half-duplex modem, and one modem can be used separately. This ensures the reliability of the binary control procedure.

Referring to FIG. 3, there is shown a sequence of binary control procedures when the automatic switching device of FIGS. 1 and 2 is placed on the called station side.

FIG. 3(a) shows a case of call transmission in which the calling station sends a message to the called station, and the called station receives the call.
Figure (b) shows a case of call origination/reception in which the calling station calls the called station and the called station transmits to the calling station. Also, the thin line arrow is 300 bit/s, the thick line arrow is 4800/240
Indicates 0 bit/s.

In other words, in the case of one call transmission, in response to a paging signal from one calling station, the called station communicates the functions it has using the DIS signal, and the calling station selects them using the DC5 signal. . Therefore, in the case of one call transmission, the DCS signal is transmitted to the called station as a response signal.

In addition, in the case of receiving two calls, when the called station returns a response with the DIS signal, the first calling station indicates to the called station the function it has with the DTC signal, and the called station selects it with the DC5 signal. Become. Therefore, in the case of receiving a 7 call, a DTC signal is transmitted from the calling station to the called station as a response signal.

After that, the process is the same in both cases, and after the sending device (in the case of call transmission, the calling station in the case of call transmission and the called station in the case of call reception) selects the function, the modem is set to 300 b.
It/s is switched to 4800/2400 bjt/s, an automatic equalizer is set by modem training, and a series of steps are executed to send an image signal, but the details are omitted.

In any case, the automatic switching device according to the present invention provided in the called station monitors the DC5 signal or DTC signal sent as a response signal and performs switching.

The operation of this embodiment will be explained in more detail below.

The calling signal input from the telephone line terminal 22 is as follows.

Switching circuit 21. It is output to the external GIII facsimile 45 via the GIII FAX connection terminal 29, and
The calling signal detection circuit 35 detects it and starts the monitoring timer circuit 34.

After receiving a paging signal, the external GI facsimile 45 transmits the DI as the called station according to the connection control procedure described above.
Sends S signal.

On the other hand, the break contact of the switching circuit 21 (telephone line terminal 22.GI [[FAX connection terminal 29]
The 300 bit/s modem 32 connected to
It has the same function as the 300 bH/s modem of the GII facsimile 45, and captures the DIS signal sent by the external GIII facsimile 45 of its own station.

It is output to the control circuit 33. The control circuit 33 controls this DIS
After first detecting the signal, the other station (calling station) sends a DCS signal, DTC signal, or NSS signal (in response to a specific user request outside the scope of the T-series recommendations) according to the connection control procedure described above. response).

That is, if the other party's station is a GIII facsimile.

In response to the DIS signal from the called station, DCSC12DTC
Since a response is required with either one of the signals and the NSS signal, the control circuit 33 uses the monitoring timer circuit 34 to monitor whether or not those signals are detected within a predetermined time. If these signals are detected within the predetermined time, the control circuit 33 determines that the other party is a GII facsimile, and does not perform switching control on the switching circuit 21. If these signals are not detected within a predetermined period of time, the control circuit 33 determines that the other party is not a Gm facsimile, and sends a control signal to the switching circuit 21 to contact the common contact (telephone line terminal 22). ) is connected to the make contact (transformer 24
) side and start the modem's incoming call operation.

After completing the incoming call operation, the modem transmits the data input from the transmitting terminal 41 to the transmitter 25. Transformer 24 and switching circuit 2
1 to the telephone line terminal 22, and the data input from the telephone line terminal 22 to the switching circuit 21.1. By outputting to the receiving terminal 42 via the transformer 24 and receiver 26, data communication becomes possible.

Although this embodiment shows an example of a configuration in which the automatic facsimile/modem switching device of the present invention is built into a modem, it is of course possible to use it alone or built into a facsimile, especially in the latter case. 300b for
It/s modem sharing is possible.

E. Effects of the Invention As explained above, 1. When switching between a facsimile and a modem connected to the same telephone line, the facsimile of the local station receives the call first, monitors the response of the other station, and If it determines from the response signal that the other station is a facsimile, it continues the facsimile communication; if it determines that the other station is not a facsimile, it switches the telephone line to the modem and processes the incoming call.

Automatic switching between facsimile and modem can be realized.

In other words, it becomes possible to automatically select the destination of a facsimile or modem to receive an incoming call, and the connection destination of the telephone line can be automatically switched to the corresponding side unattended.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the basic configuration of the present invention. FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 3 is a diagram showing the sequence of the binary control means. FIG. 4 is a block diagram showing an example of a conventional system configuration in which a facsimile and a modem are connected to the same telephone line. 11...Switching circuit, 12...Telephone line terminal 113.
...Telephone line, 14...Facsimile connection terminal, 15
...Facsimile, 16...Automatic switching control circuit, 1
7...Modem connection terminal, 18...Modem, 21...
-Switching circuit 22...telephone line terminal, 23...modem, 24...facsimile, 25...telephone, 26...
...Transmitter, 27...Transmitter, 28...Receiver,
29...GmFAX connection terminal, 31...Transformer,
32... 300 bit/s modem, 33... Control circuit, 34... Monitoring timer circuit, 35... Calling signal detection circuit, 41... Transmission terminal, 42... Receiving terminal, 45
...External Gm facsimile, 51...Line switching device. Agent (7783) 'it Noriyoshi Ikeda Figure 1 Figure 1 Branch 11110 Modem Figure 3 For outgoing call transmission In the case of outgoing call reception

Claims (3)

[Claims] (1) An automatic facsimile/modem switching device that automatically switches the connection to a telephone line from a facsimile to a modem, which monitors a response signal to the facsimile from a partner device connected to the telephone line, and monitors the results of the monitoring. , an automatic switching control circuit that outputs a control signal when determining that the other party's device is not a facsimile machine; and an automatic switching control circuit that normally connects the telephone line to the facsimile machine and connects the telephone line to the modem in response to the control signal. 1. A facsimile/modem automatic switching device characterized by comprising a switching circuit. (2) The facsimile/modem automatic switching device according to claim 1, wherein the response signal is any one of a DCS signal, a DTC signal, and an NSS signal used in facsimile communication. Device. (3) In the facsimile/modem automatic switching device according to claim 1, the facsimile is a Group 3 machine recommended by CCITT, and the automatic switching control circuit is configured to operate at a speed of 300 bit/s corresponding to the binary control procedure of the Group 3 machines. If a modem has a modem and a predetermined connection procedure signal from the other station is not detected within a predetermined time in response to a predetermined connection procedure signal sent from the local station,
An automatic facsimile/modem switching device characterized in that it is configured to send out the control signal.