JPS59226562A - Facsimile communication system - Google Patents

Abstract

PURPOSE:To enable receiving side to take proper measure by sending an RTC signal and then sending an EOP signal to which a facsimile information area is added in which information such as cause of interruption etc. is set, when transmitting side interrupts message communication. CONSTITUTION:In a facsimile communication system that follows CCITT recommendation T.30, when message communication is to be interrupted, the transmitting side sends out an RTC (control return) signal and then sends out an EOP (procedure end) signal. During constitution of the frame of the EOP signal, a facsimile information field (FIF) is added and information relating to abnormality that caused interruption of communication etc. is set to the field. On the other hand, when the receiving side receives the RTC signal after starting message communication, the receiving side waits for the EOP signal. On receiving the EOP signal, the receiving side can know whether it is interruption of communication or normal completion, and in the case of interruption, it can know the cause of interruption etc. from the content of the facsimile information field (FIF), and can take proper measure.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a facsimile communication system according to the binary control procedure of the International Telegraph and Telephone Consultative Committee (CCITT) Recommendation T, 30.

Conventional configuration and its problems Figure 1 shows what happens when an abnormality (such as a document jam) occurs on the sending side during message communication in a conventional facsimile communication system that complies with the binary control procedure of CCI Recommendation T, 30. FIG. 3 is a signal sequence diagram showing two types of transmission control procedures.

In the transmission control procedure shown in FIG. 1a, when an abnormality occurs that requires interruption of message communication, the sending side immediately stops sending the message signal and disconnects the line. 1st
In the transmission control procedure shown in the figure, when an abnormality occurs, the transmitting side immediately stops sending message signals, sends an RTC signal (control return signal), and then issues a DCN signal (disconnection command signal) to disconnect the line. Become.

FIG. 2 is a signal sequence diagram showing a transmission control procedure when message communication is interrupted by an operator on the transmitting side in a conventional facsimile communication system based on the binary control procedure of CCITT Recommendation T.30. In this figure, when the operator is interrupted, the sending side stops sending the message signal, sends the RTC signal, and then sends the EOP signal (
A procedure end signal) or a PRI-EOP signal (telephone reservation procedure final signal) is sent. That is, the procedure is the same as for normal communication termination.

Since the conventional facsimile communication method is as described above,
When an abnormality occurs during message communication and the communication is interrupted, there is a problem in that the receiver III terminates the communication as a communication abnormality even though the message communication was interrupted due to an abnormality on the sending side.

However, in the case of operator interruption, there is a problem in that the receiving side ends normally even though the message communication is interrupted.

In order to deal with the former problem, it is conceivable to perform the same procedure when an abnormality occurs as when the operator is interrupted, but this would cause the same problems as when the operator is interrupted.

Therefore, instead of the EOP signal or the PRI-EOP signal, it may be possible to define new control signals for each cause of communication interruption, and to send a control signal corresponding to the interruption factor from the transmitting side when message communication is interrupted. . However, there are problems such as an increase in the number of control procedures and poor scalability, making it impractical.

OBJECT OF THE INVENTION The present invention solves the above-mentioned conventional problems.It is an object of the present invention to eliminate the causes of interrupting message communication while maintaining a unified procedure for terminating message communication from the sending side without defining new control signals. An object of the present invention is to provide a facsimile communication method that can notify the receiving side of such information.

Structure of the Invention The present invention provides facsimile information in which information such as the cause of the interruption is set after sending an RTC signal to a sending side in a facsimile communication system that complies with CCITT Recommendations T and 30. The above object is achieved by transmitting an EOP signal or a PRI-EOP signal with an added field.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a signal sequence diagram of a facsimile communication system according to an embodiment of the present invention, and shows an example of a transmission control procedure when message communication is interrupted due to an abnormality on the sending side (or when the operator interrupts it). .

To explain only the difference from the conventional method, the communication method of the present invention can be applied by exchanging the NSF signal (control signal indicating a non-standard function) and the NSS signal (control signal setting the non-standard function) in response to the NSF signal. Check between transmitting and receiving stations.

If an abnormality occurs on the transmitting side during message communication (if a break or operator interruption occurs), the transmitting side immediately interrupts the message communication and sends the RTC signal L, then the KEOP signal (fta1dPR1-EOP signal). Send. This E
A new facsimile information field is added to the frame of the OP signal (or PRI-EOP signal), and information regarding the abnormality (or operator interruption) etc. that caused the communication interruption is set in the field.

On the other hand, when the receiving side receives an RTC signal after starting message communication, it sends an EOP signal (or PRI-EOP signal).
wait. When this control signal is received, it is possible to know from the contents of the facsimile information field whether the communication is interrupted or terminated normally, and if so, the cause of the interruption, etc., so that appropriate processing can be performed.

FIG. 4 is a frame configuration diagram of the above EOP signal and PRI-EOP signal. In this figure, F is a flag field, A is an address field, C is a control field, and FCFid facsimile control field, which are the same as in the conventional field.

PIF is a facsimile information field added according to the present invention, and information indicating the cause of termination of the message communication (if it is interrupted, the cause of the interruption; if it is terminated normally, that fact), etc. is set in this field. Incidentally, an increase in the number of termination factors can be easily dealt with by expanding the facsimile information field, so it is highly extensible.

FIG. 5 is a schematic block diagram showing an example of a facsimile device that performs facsimile communication using the above communication method.

In this figure, 1 is a control section that controls the entire apparatus, 2 is a mechanism section that feeds the original, and also has means for detecting abnormalities in the mechanism. Reference numeral 3 denotes a panel section operated by the operator, from which the operator instructs to interrupt communication. Reference numeral 4 denotes a reading section that reads a document, and 5 indicates a signal sending section that generates and sends out control signals. The signal sending section 6 also has a function of sending out the signal from the reading section 4 as a message signal. 6 is a modulation/demodulation section, and 7 is a network control section that controls connection with the communication line 8. To explain the operation, after exchanging the NSF signal and NSS signal, message communication begins, and the signal sending section 6 on the transmitting side uses the signal output from the reading section 4 as a message signal to send the modulation/demodulation section 6 and the network control section 8. The signal is sent to the communication circuit 8 via the communication circuit 8.

During this message communication, if an abnormality is detected in the mechanism section 2 on the sending side that makes it impossible to continue the communication, or if the operator instructs to interrupt communication from the panel section 3, the control section 1 stops the signal output from the reading section 4. and instructs the signal sending unit 5 to terminate the communication. The signal sending section 6 first sends out an RTC signal based on a command from the control section 1. Then, an EOP signal or PRI-EOP signal frame with the cause of interruption etc. set in the facsimile information field is created and sent.〇Effects of the Invention As described above, according to the present invention, if an abnormality occurs on the sending side during message communication, If this occurs and the communication is interrupted or the operator is interrupted, operator intervention is required because after sending the RTC signal, an EOP signal or FiPRI-EOP signal with a facsimile information field in which the cause of the interruption etc. is set is sent. This allows the receiving side to know the causes of communication interruptions in detail and take appropriate actions, without having to worry about the need to define new control signals and procedures for each cause of interruptions. Many benefits can be obtained, such as being highly expandable.

[Brief explanation of the drawing]

Figure 1 is a signal sequence diagram showing the transmission control procedure when message communication is interrupted due to an abnormality on the sending side in the conventional facsimile communication system, and Figure 2 is the signal sequence diagram showing the transmission control procedure when message communication is interrupted by the operator in the conventional facsimile communication system. FIG. 3 is a signal sequence diagram showing a control procedure. FIG. The diagram shows the EOP signal and PRI-E in Figure 3.
FIG. 5 is a schematic block diagram of a facsimile apparatus to which the facsimile communication system of the present invention is applied. P I F,,=,,EOP signal 4 Tld, P R
I-E Facsimile information field added to OP signal, 1...control section, 2...mechanism section, 3
- Panel section, 5... Signal sending section.

Claims (1)

[Claims] When message communication is interrupted on the sending side, after sending a control return signal (RTC signal), an end of control signal (EO) is sent.
PRI-EOP) or telephone reservation procedure end signal (PRI-EOP)
A facsimile information field is added to the above-mentioned 1-end signal (EOP signal) or the telephone reservation procedure end signal (PRI-EOP signal) in which information including the cause of interrupting the message communication is set. facsimile communication method.