JPH04115647A - Data modulator and demodulator with facsimile discriminating function - Google Patents

Abstract

PURPOSE:To automatically switch a telephone line without worrying about the facsimile transmission capacity of an opposite party station by controlling the switching circuit by inputting each output of a call signal detection circuit, a 300 bit/s MODEM, and a 2100 Hz detection circuit. CONSTITUTION:In the case that the opposite party station is GII facsimile after a call terminates to a built-on GIII facsimile 10, a GII facsimile connecting procedure signal is transmitted. Then, the 300 bit/s MODEM 5 receives the standard CCITT capacity display signal of called equipment transmitted at the time of the termination of the built-on GIII facsimile 10, and converts it into a digital signal, and outputs it to a facsimile signal discrimination control circuit 7. The facsimile signal discrimination control circuit 7 makes a supervisory timer circuit 8 start to count definite time at the point of time when this signal can be detected. After that, a connecting procedure signal from the opposite party station is supervised by the 2100Hz detection circuit 6, and if it can be detected, it is outputted to the facsimile signal discrimination control circuit 7. Thus, the opposite party station can automatically switch the telephone line by discriminating whether the GII facsimile is the MODEM or not.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a data modulation/demodulation device that performs data communication using a telephone line. , relates to an automatic telephone line switching system when a calling signal is received.

2. Description of the Related Art Conventionally, this type of data modulation/demodulation equipment has been used when the other station is GII[
It only has the function to identify whether it is a facsimile or a modem, and there is no way to identify if the other station is a GII facsimile, so the local station and the other station must always confirm whether it is a modem or facsimile with the same specifications. It was necessary to use it from Therefore, in the past, if the other party was a GI facsimile, it was necessary to confirm that the person was using a GII facsimile before data communication and manually switch the telephone line.

Hereinafter, the conventional technology will be explained using FIG. 2.

FIG. 2 is a block diagram of a conventional data modulator/demodulator with facsimile identification function.

In FIG. 2, a calling signal input from a telephone line terminal 11 is detected by a calling signal detection circuit 13, and
It is output to the external GII facsimile 20 via the switching circuit 14 and the G11r facsimile connection terminal 12. After this, the external GIII facsimile 20 receives the 6 GIII facsimile connection procedure signal, which is sent to the CCITT T
300 bit/s (CCTTT V
21) to be done with an external GIII modem.
After the facsimile 20 arrives, the GIII facsimile connection procedure signal 300 bit/s motem 15 receives it, converts it into a digital signal, and outputs it to the facsimile signal identification control circuit 17.

In the facsimile signal identification control circuit 17, the DIS (standard C
When the CITT capability display (CITT capability display) signal is first monitored and detected, the monitoring timer circuit 18 allows the other station to detect GII.
I facsimile connection procedure signals DC3 (digital setting commands corresponding to standard functions identified by DIS signals) or N5S (digital command responses to specific user requests outside the scope of the T-series recommendations) or DTC (
The digital command response to the standard function identified by the DIS signal is monitored. In the GIII facsimile connection procedure signal, one of the DC5/NSS/DTC signals is always a signal sent from the other party's facsimile. If an NSS/DTC signal is detected, the facsimile signal identification control circuit 17 determines that the other party is a GI [I facsimile] and selects the switching circuit 14e.
GI [Gll facsimile communication is continued without changing the connection to the I facsimile connection terminal 12 side.

Further, if the DC3/NSS/DTC signal is not detected when the fixed detection time by the monitoring timer circuit 18 has elapsed, the facsimile signal identification control circuit 17 determines that the other party is not a GI facsimile, and switches the switching circuit 14 on. By switching to the data modulation/demodulation circuit 19 side, the data modulation/demodulation device starts the incoming call operation.

Problems to be Solved by the Invention The above-mentioned conventional data modulator/demodulator with facsimile identification function does not have a means to automatically identify whether or not it is a GII facsimile after detecting a paging signal when the other party is a GII facsimile. Because a person had to start up the device they wanted to use after discussing with the person at the other end over the phone whether it was a GII facsimile or a modulator/demodulator, it could only be used when there was a person present; After a meeting has been held over the phone, the device on the side that is not being used must be set to not automatically receive calls, and the disadvantage is that it is not possible to automatically identify whether the other party is a GLL facsimile or a modem and switch the telephone line. Ta.

The present invention has been made in view of the above-mentioned conventional circumstances,
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a novel data modulation/demodulation device with a facsimile identification function, which makes it possible to eliminate the above-mentioned drawbacks inherent in the conventional technology.

Means for Solving the Problems In order to achieve the above object, the data modulation/demodulation device with a facsimile identification function according to the present invention includes a switching circuit that switches signals input and output from a telephone line to a data modulation/demodulation circuit or an external GI facsimile. , a calling signal detection circuit that detects a calling signal input from the telephone line;
l CCITT Recommendation Y2 Recommendation A21 demodulation circuit (300 bit/s modem) that detects facsimile connection procedure signals;
o++.

a detection circuit, the calling signal detection circuit and 300 bit/s.
modem and 21008. a facsimile signal identification control circuit that receives each output of the detection circuit as input and controls the switching circuit;
and a monitoring timer circuit that monitors the signal identified by the facsimile signal identification control circuit for a certain period of time and notifies the facsimile signal identification control circuit of the result. It has a function to determine whether or not to activate its own modem.

Embodiment Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, one embodiment of the present invention connects the break contact of the switching circuit 4 and the input of the 300 bit/s modem 5, and connects the input of the 300 bit/s modem 5 to 2100) 1
z detection circuit 6, the common contact of the switching circuit 4 is connected to the input of the calling signal detection circuit 3, and the 300
The output of the bit/s modem 5, the output of the detection circuit 6, the output of the ringing signal detection circuit 3, and the output of the monitoring timer circuit 8 are connected to the input of the facsimile signal identification control circuit 7, respectively. , the output of the facsimile signal identification control circuit 7 is connected to the switching circuit 4 as a control signal, the make contact of the switching circuit 4 is connected to the data modulation/demodulation circuit 9, and the break contact of the switching circuit 4 is connected to the GII.
The I facsimile connection terminal 2 is configured as an I facsimile connection terminal 2, and the common contact of the switching circuit 4 is configured as a telephone line terminal 1.

The operation of the present invention will be explained below.

Referring to FIG. 1, a calling signal inputted from a telephone line terminal 1 is detected by a calling signal detection circuit 3, and
It is output to the external G11i facsimile 10 via the switching circuit 4 and the Gll facsimile connection terminal 2. After this, the external GIII facsimile 10 receives a call.

Here, if the other party's station is a GII facsimile, the explanation of the operation will be omitted since the contents are the same as those explained in the prior art.

If the other station is using a facsimile, the external G IOHHz, continuous signal of 1.5 seconds or more and 10 seconds or less) is sent out.

The 300bit it/s modem 5 receives the Dis (standard CCITT capability display of the called device) signal sent when the external GIIL facsimile 10 receives a call, converts it into a digital signal, and outputs it to the facsimile signal identification control circuit 7. do. The facsimile signal identification control circuit 7 causes the monitoring timer circuit 8 to start counting a certain period of time when DNS is detected. After that, GC2 from the other station is 2
The 100Hz detection circuit 6 monitors the signal, and if it is detected, outputs it to the facsimile signal identification control circuit 7.

In the facsimile signal identification control circuit 7, if the GC2 signal is detected after a certain period of detection by the monitoring timer circuit 8 has elapsed, the other station determines that it is a (J facsimile) and switches the switching circuit 4 to the GIII facsimile connection terminal 2 side. Continue GIT facsimile communication without changing the connection.

Further, if the GC2 signal is not detected after the predetermined period of detection by the monitoring timer circuit 8 has elapsed, the facsimile signal identification control circuit 7 determines that the other party is not a GII facsimile, and switches the switching circuit 4 to the data modulation/demodulation circuit 9. By switching to the side, the data modulator/demodulator with facsimile identification function of the present invention starts the incoming call operation.

As described in detail, according to the present invention, when a GII facsimile and a modem are connected to the same telephone line and a calling signal is received, the own GI facsimile is first received. If the signal from the other station is determined to be GII facsimile or Gl facsimile, Gm facsimile or Gm facsimile communication is continued, and the signal from the other station is GI [facsimile or Gm facsimile]. If it is determined that there is no call, the telephone line can be automatically switched to the modem and the modem can automatically receive the call. This also provides the effect that telephone lines can be automatically switched by facsimile and modem automatic incoming call selection without worrying about the facsimile transmission capability of the other party.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a data modulation/demodulation device according to the present invention. DESCRIPTION OF SYMBOLS 1...Telephone line terminal, 2...GIIl facsimile connection terminal, 3...Call signal detection circuit, 4...Switching circuit, 5...300bit it/s modem, 6...21
00)1. Detection circuit, 7...Facsimile signal identification control circuit, 8...Monitoring timer circuit, 9...Data modulation/demodulation circuit, 10...External GIII facsimile Figure 2 is a block diagram showing an example of the prior art. It is.

Claims (2)

[Claims] (1) In a data modulation/demodulation device having a switching circuit for switching signals input/output from a telephone line to a data modulation/demodulation circuit or an external GIII facsimile, and a calling signal detection circuit for detecting a calling signal input from the telephone line. , a demodulation circuit (hereinafter abbreviated as 300 bit/s modem) compliant with CCITT Recommendation V21 that detects the GIII facsimile connection procedure signal input from the telephone line.
210, which detects only the 2100 Hz signal among the GII facsimile connection procedure signals input from the telephone line.
a facsimile signal identification control circuit which has a 0Hz detection circuit, receives each output of the calling signal detection circuit, the 300 bit/s modem, and the 2100Hz detection circuit as input and controls the switching circuit; 1. A data modulation/demodulation device with a facsimile identification function, comprising a monitoring timer circuit that monitors the identified signal for a certain period of time and notifies the facsimile signal identification control circuit of the result. (2) The facsimile signal identification control circuit controls the facsimile signal identification control circuit to control the
2. The data modulation/demodulation device with a facsimile identification function according to claim 1, further characterized in that when the signal is detected, the other station determines that the facsimile is a GII facsimile.