JPS63144641A - Communication system - Google Patents

Abstract

PURPOSE:To prevent deterioration in the transfer information by sending directly the information from a 1st station to a 3rd station so as to reduce the installation and communication cost in transferring the information from the 1st communication station to the 3rd communication station via a 2nd communication station. CONSTITUTION:The call signal of a code 201 is sent from a facsimile equipment A to an equipment B in the information transmission using the telephone line among the facsimile equipment A, B and C and the equipment B returns a signal (code 202) such as NSF as the initial discrimination signal according to the G3 facsimile procedure. In this case, the equipment B uses a facsimile information field of the NSF signal to return a telephone number data of a transfer destination and when the equipment A receives it, a CFR signal 203 is sent. In receiving the CFR signal 203, the equipment B sends a DCN (cut off command) signal 204 to disconnect the line. After the line disconnection, the equipment A sends the call signal 205 to the equipment C based on the telephone number data received from the equipment B to transfer the picture data directly. Thus, the installation and communication cost are reduced to prevent the deterioration of the signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication method, and particularly to a communication method for transferring information.

[Prior Art] Communication systems that transfer information using telephone lines such as telephones and facsimile machines are conventionally known. In the conventional method, after a line connection is established from a first station to a second station, the second station establishes a line connection with a third station, and the two lines are connected via a repeater. Was.

[Problems to be Solved by the Invention] Therefore, since a plurality of lines are always used for communication, there is a problem that the efficiency of line usage decreases and communication costs increase. In addition, when audio, image data, etc. are transferred through multiple lines, the signal deteriorates due to loss.Relays are used to compensate for the loss of the zero line, but the structure of repeaters is complex, and the equipment Another problem is that the cost is high.

[Means for Solving the Problems] In order to solve the above problems, in the present invention, information is transmitted from a first communication station to a third communication station via a second communication station using a telephone line. In the communication method for transferring, the second
When the communication station receives a call from the first communication station, the first communication station
After transmitting only the telephone number of the third communication station to the third communication station, the line connection is cut off, and then the first communication station directly calls the third communication station and transfers the information.

[Operation] According to the above configuration, since information is directly transmitted from the first station to the third station, communication costs can be reduced and deterioration of the transferred information can be prevented.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings. An example of a facsimile machine will be described below.

FIG. 1 shows the configuration of a facsimile machine employing the present invention. In the figure, a telephone line designated by the reference numeral 2a is connected to the NCU 2.

The NCU 2 connects the telephone line 2a to the telephone 4 or the facsimile device of the hybrid circuit 6 and below by controlling the signal line 34a. A calling circuit 26 that transmits a dial signal to the telephone line is connected to the line on the telephone 4 side of the NCU 2.

The calling circuit 26 outputs a dial signal corresponding to the telephone number input from the signal line 34c to the NCU 2.0 Call timing is instructed by the pulse of the signal 1i34d.

The facsimile machine with the hybrid circuit 6 or below is configured as follows. First, the receiving system will be explained.

The hybrid circuit 6 is used to separate transmitted and received signals. A transmission signal is input through the signal line 2C, and a reception signal is output through the signal line 6a. Demodulator 18 is CC
The demodulated procedure signal is demodulated using a demodulation method that complies with ITT Recommendation V21. ! The signal is input to the control unit 34 via j18a.

On the other hand, the received image data conforms to CCITT Recommendation V 27.
ter or V29 compliant demodulator 2o,
After being decoded by the decoding circuit 22, it is recorded by the recording circuit 24, which includes a thermal printer or the like.

Next, the transmission system will be explained.

The modulator 14 modulates the procedure signal to be transmitted using a modulation method that conforms to CCITT recommendation V21.The procedure signal to be modulated is input from the control unit 34 via the signal line 34b.

On the other hand, the original image is scanned by a reading circuit 8 comprising a CCD line sensor or the like, and is encoded by an encoding circuit 10 using the MH or MR method. Encoded data is sent to demodulator 2
0 and is modulated by the modulator 12 corresponding to the signal line 12a.
The signal is input to the adder circuit 16 via the adder circuit 16.

The adder circuit 16 is for adding the transmitted images or procedure signals inputted from the plurality of signal processing devices described above.

The control unit 34 is composed of a microcomputer or the like, and controls the operation of the entire device according to a program stored in the ROM 34r.

The operation unit 28 is composed of a keyboard including a numeric keypad, a start key, alphabet keys, etc., and a display.
Input data from the keyboard is signal &128 a~28
The signal is input to the control unit 34 via c.

Further, the keyboard of the operation unit 28 is provided with a switch 30 for specifying an image data transfer mode. The state of switch 30 is read via signal line 30a.

The storage circuit 32 is for storing telephone number data of the transfer destination, and is composed of elements such as a RAM. Memory circuit 3
Data input/output to and from the signal line 32a is performed through the signal line 32a. Reading and writing are controlled via signal lines 34e and 34f.

Next, operations in one or more configurations will be explained.

FIG. 2 shows a transfer operation performed using the above facsimile machine. Here, three facsimile machines A, B, and C are shown.

First, device A sends a calling signal as indicated by reference numeral 201. On the other hand, device B follows the G3 facsimile procedure and uses N5F (non-standard device) and C3l as initial identification signals.
(receiving station identification) and DIS (digital identification) signals are transmitted (reference numeral 202).

At this time, the device 21B uses the facsimile information field of the NSF signal to transmit the telephone number data of the transfer destination.

The 47th bit of the facsimile information field of the NSF signal is used to identify the transfer request from device B. If the 47th bit is 0, there is no transfer request; if it is 1, the 20 bytes from the 7th to 26th bytes of the information field are used to simultaneously transmit telephone number data.

When device A receives the identification signal as described above, it determines the CFR.
Send signal 203. When device B receives the CFR signal, it transmits a DCN (disconnection command) signal 204 and disconnects the line. After disconnecting the line, device A transmits a calling signal 205 to device c based on the telephone number data received from device B. Below is the outfit! Image data is transferred directly to the IC.

FIG. 3 shows the processing procedure of the control section of the facsimile machine B described above.

The control unit 34 of the device B performs the NC operation in step S42 in FIG.
Open the U2 CML relay. That is, the signal line 34
Output O to a, times! ll2a is connected to the telephone 4 side.Next, an incoming call is detected in step S44. Incoming call detection is performed using the calling signal detection circuit of the NCU 2. If there is no incoming call, the process moves to step S46, and it is determined whether or not to register a transfer destination. This determination is made by checking the input from the operation unit 28. If the registration mode is specified, the transfer destination is registered in step 348. The registration process is similar to the phone number input process of known speed dialing. After completing the registration, proceed to step S4.
Loop to 2.

On the other hand, if there is an incoming call, the signal line 34 is
Output data l to a and turn on the CML relay of NCU2.
Set it to N and connect the line to the facsimile machine side.

In step 352, it is determined whether a transfer mode is selected. This determination is made by checking the state of the switch 30. If the transfer mode is not selected, normal image transmission/reception operations are performed in step 354.

On the other hand, in the transfer mode, in step 556, the telephone number of the transfer destination is transmitted, as indicated by reference numeral 202 in FIG. In step 558, as shown in FIG.
03 is received. If the CFR signal is received, the line connection is disconnected by the DCN signal 204 in step S60. In step 362, it is determined whether a reception command signal such as a DO3 signal has been received. When a reception command is received, the process of 0 or more, which proceeds to normal reception processing in step S54, is repeated until the elapse of a predetermined time is confirmed in step S64.

FIG. 4 shows the processor 111 of the control unit 34 of the device tA in FIG.
It shows R. Steps 572 to 578 in FIG.
This is the same process as steps 342 to 548 in FIG.

Step 582. In S84, 386, step S86
The NSF/C3I/DIS signal (reference numeral 20 in Fig.
2), the 47th bit of the information field of the received NSF signal is checked in step 588. outfit fi
If B wants to transfer, the 47th bit data is 1, so the process moves to step S90, but in the case of O, the process moves to step 5106 and 1 normal transmission/reception processing is performed.

If transfer is specified, NS is selected in step S90.
The telephone number data of the 7th to 20th bytes of the F signal are input and temporarily stored in the storage circuit 32. And step S9
2, the CFR signal is transmitted.

In the loop of steps S94 and 396, the device B waits for a DCN signal for a predetermined waiting time, and when the DCN signal is received, the CML relay is cut off in step 598.
After opening for 100 seconds, the CML relay is turned ON again in step 5102, and the installed fiB is turned on in step 5104.
Make a call based on the phone number data received from
At this time, the control section 34 transmits a dial signal by giving telephone number data to the calling circuit 26 via the signal line 34c and outputting a calling command pulse to the signal line 34d.

After that, in step 5106, the image data to be transferred is transmitted to the device MC.

According to the above configuration, image information can be transferred through a single line without using expensive repeaters as in the past, and therefore equipment and overall communication costs are kept low. , and also has the excellent effect of preventing deterioration of the transmitted signal.

The above configuration is not limited to facsimile devices, but can be applied to other data communication devices.

[Effect of the invention] As is clear from the above description, according to the present invention, the first
In a communication method in which information is transferred from a communication station to a third communication station via a second communication station using a telephone line, when the second communication station receives a call from the first communication station, A configuration is adopted in which the line connection is cut off after only the telephone number of the third communication station is transmitted to the first communication station, and then the first communication station directly calls the third communication station and transfers the information. Therefore, information can be transferred using the same hardware as a normal facsimile machine without using a repeater. When transferring, do not use a repeater,
Furthermore, since only one line is used, equipment and communication costs are low, and signal deterioration does not occur.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the structure of a facsimile machine adopting the present invention, Fig. 2 is an explanatory diagram showing how information is transferred, and Figs. 3 and 4 are processing of the control unit shown in Fig. 1. FIG. 3 is a flowchart diagram showing a procedure. 2a...Telephone line 26...Calling circuit 28...
・Operation unit 3o...Switch 34...Control unit te'-9 turn: IL/) it light figure 2 car 6 transmission station n $ operator/detection flow sota-) 1ffl No. 3
figure

Claims (1)

[Claims] In a communication method in which information is transferred from a first communication station to a third communication station via a second communication station using a telephone line, the second communication station receives a call from the first communication station. In this case, after transmitting only the telephone number of the third communication station to the first communication station, the line connection is cut off, and then the first communication station directly calls the third communication station and transfers the information. Characteristic communication method.