JPS5949067A - Fault ending system of facsimile terminal device - Google Patents

Abstract

PURPOSE:To attain the instantaneous recovery of a fault at the transmitter side, by requesting the end of operation to the transmitter side from the receiver side with no dependence on the recovering operation of a circuit exchange network in case the discontinuation of communication is intended after some fault is detected at the receiver side before a screen reaches its ending part. CONSTITUTION:When a fault is detected with a received picture signal due to the deterioration of circuit quality, etc. after decording the picture signal at the receiver side, a fault detecting is sent to a network controller 1-1 via a communication controller 1-4 at a time point when the send-back conditions are detected by a facsimile controller 1-5. When the fact that the end of fault is requested is understood by a multi-frequency signal detected by a multi-frequency signal detecting circuit 114, this detecting output is transmitted to a communication controlller 9-4 via a multi-frequency signal control circuit 115 and after receiving a level conversion through a level converting circuit 116. The controller 9-4 is forcibly shifted to a recovering sequence with interruption of a fault end requesting signal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applied to a caller-controlled facsimile half-duplex communication system in which image information is sent and received using a procedure for responding on a single screen through a single-line switch. Termination method Conventionally, in facsimile communication according to the Group 3 standard recommended by JTT, if the installed facsimile terminal equipment is accommodated in a caller-controlled circuit-switched network, the receiving side If the result of decoding the received image information does not match the specified number of lines per line, it will be marked as abnormal.If the number of abnormal lines exceeds a certain value, it will be marked as abnormal. (Assuming that the i'N signal return condition is met, the line is held invalid until the end of one screen on the sending side. Therefore, when sending a screen with high density, the invalid hold time becomes longer.

) Not only was the M-transfer fee was wasted, but it also had the disadvantage of causing deterioration of the Rahinoku conditions.

The object of the present invention is to detect any abnormality on the receiving side before reaching the final part of 9 screens in FACNOMI communication, which uses a half-duplex communication system and adopts a procedure for responding to image information on a screen-by-screen basis. 1) When trying to cancel communication, 1) Tall requests the sending side to terminate the communication without relying on recovery operations on the circuit switching network, and 2) Enables immediate recovery from the sending side. An object of the present invention is to provide a method for abnormally terminating a facsimile terminal device.

This invention is applied to a caller-controlled facsimile communication system in which a plurality of facsimile terminal devices send and receive image information via a line-switched network using a procedure for responding on a screen-by-screen basis, and the facsimile terminal The apparatus includes a level conversion means, an abnormal termination request signal control means, an abnormal termination request signal generation means, an abnormal termination request signal detection means, and a bidirectional branching means, and the receiving facsimile apparatus detects an abnormality at the time of reception. Then, the detected abnormality signal is level-converted by the level conversion means, and the level-converted output activates the abnormality termination method signal generating means via the abnormality termination request signal control means, The output of the abnormal termination request signal generating means is sent to the facsimile terminal device that is transmitting via the bidirectional branching means inserted on the line side. When a request signal is sent, the abnormal termination V is detected through the bidirectional branching means, the abnormal termination request signal is detected by the damage signal detection means, and the level conversion is performed through the abnormal termination request signal detection means. Strengthen your means.

Strengthen the sending of the image information being transmitted by the converted output: 1
An abnormal termination method for a facsimile terminal device is obtained, which is characterized in that termination is performed in a jll-like manner.

Next, seven embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment according to the present invention. In this figure, 1 to 9 represent nine facsimile terminals, and 10 represents a circuit switched network. Terminal device A is basically a group 6 terminal of the CCl 'J'T recommendation, and each terminal is 1-1 to 9.
-1 network control device.

high-speed modems 1-2 to 9-2, low-speed modems 1-3 to 9-3, communication control devices 1-4 to 9-4, and 1-5
It is composed of facsimile control devices 9-5. Of these, network control devices 1-1 to 9-1 have features according to the present invention, and a specific example of their configuration is shown in the block diagram of FIG. 2. In this example, 101,1
02 indicates a level conversion circuit.

Of these, 101 are standard 1) T I8 interfaces, 1
02 is used as the marking interface to the modem. 103 is a connection completion display circuit, 104 is a next number request control circuit, and 105 is a dial signal sending iJ'Ifli'1
1 wholesale circuit, 106 is a line in use display circuit, 107 is a call release control circuit, 108 is a call abandonment control circuit, 10Sl:J, 1
1-〒 limit monitoring circuit, 110 is an incoming and outgoing collision prevention circuit, 11
1 is a dial signal sending circuit. The elements shown within the broken lines are added as features of the present invention, and are 112
116 is a bidirectional branch amplifier circuit, 116 is a multifrequency signal generation circuit,
114 is a multi-frequency signal detection 1ffil path.

115 is a multi-frequency signal control circuit, and 116 is a level conversion circuit for multi-frequency monitoring and control that connects the multi-frequency signal control circuit 115 and communication control devices j9.14 to 9-4. Note that each of the network control devices 1-1 to 9-1 has the same configuration as shown by reference numerals in FIG. -1 is shown in relation.

1. When the facsimile terminal device 1 is placed in the reception state V, the contact mcb of the mode switching relay of model I is activated to the high-speed modem side, as shown in FIG. The received image signal is sent to high-speed modem 1.
-2. here.

As a result of decoding both signals on the receiving side, if any abnormality is detected in the received image signal due to quality deterioration on the line, etc., the return condition is , the communication control device 1-4 transmits the abnormality detection signal.
It is sent to the net-side dumpling device 1-1 via the wire. In the network control device 1-1, this signal is level-converted by the level conversion circuit 116 and transmitted to the multi-frequency signal control circuit 115. The multi-frequency signal control circuit 115 transmits multi-frequency signals.

Relay contact rnfk multi-frequency multi-frequency 1] 1), and if the high-speed modem 1-2 complies with the CCITT-V27 system, the multi-frequency signal generation circuit 113 is controlled so that signals outside the used band are 450Hz and 3 1 50
A multi-frequency signal is generated by a combination of Hz. This multi-frequency signal is sent to the line via the bidirectional branch amplifier circuit 112 as an abnormal termination request signal.

If the terminal on the transmitting side is, for example, the Facunmi terminal device 9, then the multi-frequency signal sent from the line is inputted to the multi-frequency signal detection circuit 114 via the bidirectional branching amplifier circuit 112, and is output at 450 Hz and 3150 Hz. A multi-frequency signal is detected. Needless to say, on the transmitting side, the multi-frequency signal control circuit 115 selects mf with 011 at the time of 2 transmission.
One IJ point is controlled to the multi-frequency signal detection circuit 114 side. When the multi-frequency signal detected by the multi-frequency signal detection circuit 114 indicates that an abnormal termination request has been made, the detection output is sent via the multi-frequency signal control circuit 115.

The signal is level-converted by the level conversion circuit 116 and transmitted to the communication control device 9-4. The communication control device 9-4 is forced to shift to the 11th sequence due to the interruption of this abnormal termination request signal.

In the above embodiment, a case has been described in which an error in image information is detected during reception. I can do something. This storage type relay device includes a central processing unit 21, a file device 225, a communication control device 23, a high speed modem 24, and low speed modems 25-1 to 25.
-n.

Network control devices 26-1 to 26-n, multi-branch amplifier circuit 27
.

It is composed of two-branch amplifier circuits 28-1 to 28-n, a line switching network 29, and relay contacts rLl to rln.

According to such a configuration, if an abnormality is detected in m terminal devices out of n facsimile/millimeter terminal devices that are notified once during transmission of image information from the central processing unit 21 via the 24 full-speed modems. ni ni 1.

As in the case of individual communication in the above-mentioned embodiment, m receiving In. It is possible to send a termination request from the II terminal device (DA) to the required multi-frequency signal total storage device and restore the signal.

In the examples shown in Figures 1 and 3 above, a multi-frequency signal 151 with different frequencies is used as the abnormal termination request signal, but even a single frequency signal may be selected as an out-of-band signal depending on the type of switching network. Needless to say, you can make crabs.

As is clear from the above explanation, according to the present invention, if an abnormality occurs in the facsimile machine during reception, an abnormal termination request signal is sent to the line switching network via the branch circuit.
By detecting this on the sending terminal, one sending side can immediately perform recovery without relying on the recovery operations of the nine circuit switched networks, so the sending side completes the transmission of one screen as a whole, unlike in the past. The first thing to do is to prevent the line from being used in vain until the end of the process, which prevents deterioration of traffic conditions.
This has a significant effect on system operation. In particular, when the present invention is applied to a broadcast/system to carry out serial transmission, even if a communication error occurs in any of the multiple lines that are reported 9 times, only the abnormal line will be immediately restored.
It is possible to continue the transmission of other normal lines by 1.1, and more economical operation becomes possible.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment according to the present invention.
FIG. 2 is a block diagram showing a specific configuration example of the network system side device 1 in FIG. 1, and FIG. In the figure, 1 to 9 are FAX 7mm terminal devices. 1-1 to ?-1 are network control devices, 1-2 to ?-2 are high-speed modems, and 1-6 to 9-3 are low-speed modems. ,1-4~9-4
1 is a communication side equipment, 1-5 to 9-5 are facsimile 7mm control devices, 10 is a line switching network, and 21 is a central processing unit. 221-j: File device, 26 is communication control device, 24
is a high-speed modem, and 25-1 to 25-n are low-speed modems. 26-1~:26-n IrJ, net 11i11 g4]
device, 27 is a multi-branch amplifier circuit, 28-1 to 28-n
fd2 branch amplifier circuit, 29 is circuit switched network, ioi,
io2. ii6 is a level conversion circuit. 103 is a connection completion display circuit, 104 is a next number request control circuit, and 105 is a dial signal sending circuit. 106 is a line in use display circuit, 1071C is a call control circuit, 108 is a call abandonment control circuit, 109 is a time limit monitoring circuit, 1
10 is a sending/receiving collision prevention circuit, 111 is a dial signal sending circuit, and 112fl is a bidirectional branch amplifier circuit. 113 is a multifrequency signal generation circuit, 114 is a multifrequency signal detection circuit, and 115 is a multifrequency signal control circuit. Figure 2

Claims (1)

[Scope of Claims] 1. Applied to the facsimile/millimeter communication system of caller control 1 in which a plurality of facsimile terminal devices send and receive image information by a procedure of taking responses on a screen-by-screen basis via a line-switched network,
The facsimile terminal device includes a level conversion means, an abnormal termination request signal control means, an abnormal termination request signal generation means, an abnormal termination request signal detection means, and a bidirectional branching means. When an abnormality is detected, the level of the detected abnormal signal is converted by the level conversion means, and the level-converted output activates the abnormality termination request signal generation means via the abnormality termination request signal control means. , the output of the abnormal termination request signal generating means is sent to the facsimile terminal device that is transmitting via the bidirectional branching means inserted on the line side, and the abnormal termination request signal is sent from the facsimile terminal device that is receiving the signal at the time of transmission. When a request signal is sent. detecting the abnormal termination request signal by the abnormal termination request signal detection means via the bidirectional branching means, and applying it to the level conversion means via the abnormal termination request signal control means;
An abnormal termination method for a facsimile terminal device, characterized in that transmission of image information being transmitted is forcibly terminated by the converted output.