JPH0423865B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a method for reducing transmission control procedure time of a facsimile apparatus.

Description of Prior Art Conventionally, as shown in Figure 1, the transmission control procedure for G3 machines in accordance with CCITT Recommendation T30 is that the calling party first makes a call, and the called party receives a ringer signal. Start receiving. After starting reception, the called side sends the called station verification signal CED, non-standard equipment signal, NSF, called subscriber identification signal CSI, and digital identification signal DIS to the calling side. The calling party starts transmitting after hearing and confirming the called station verification signal CED, and subsequently receives the non-standard equipment signal NSF, the called subscriber identification signal CSI, and the digital identification signal DIS.
As a result of the analysis, the transmitted subscriber identification signal TSI, non-standard equipment setting signal NSS or digital command signal DCS
followed by a training check signal.
Send TCF. When the called side (receiving side) receives the training check signal TCF normally without any errors, it sends a reception confirmation signal CFR,
The calling side (sending side) detects this and sends a message.
Send MESS. After sending the message, if there is no document to send next, a procedure end signal EOP is sent, and after the receiving side detects the procedure end signal EOP, if the message has been received normally, it sends a message confirmation signal MCF. After receiving the message confirmation signal MCF, the transmitting side sends a disconnection signal DCN and ends the transmission, and the receiving side receives the disconnection signal DCN and ends the reception. Facsimile communication is performed by the above procedure.

FIG. 2 shows the format of the control signal in binary code. The figure shows non-standard equipment signal NSF, called subscriber identification signal CSI, and digital identification signal DIS.
The information shown in Figure 1 is the transmitting subscriber identification signal TSI, non-standard equipment setting signal NSS (digital identification signal DCS), reception confirmation signal CFR, and procedure end signal.
EOP, message confirmation signal MCF, disconnection signal DCN
The same applies to control signals such as . What should be noted here is that a preamble consisting of a flag pattern is always added for about 1 second to the beginning of each control signal. For example, reception confirmation signal
While the transmission time of a CFR frame is approximately 0.2 seconds, a preamble is added for approximately 1 second. On the other hand, various methods are being considered to reduce the transmission time for message transmission. As a result, when comparing the message transmission time and the time required for the control procedure, depending on the type of document, the time required for the control procedure may be longer. The communication time of facsimile is the sum of the message sending time and the time required for control procedures, and conventional facsimile control procedures have the disadvantage that half or more than half of the communication time is spent on control procedures. was.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional circumstances, and therefore, the purpose of the present invention is to
The object of the present invention is to provide a new control procedure that eliminates the above drawbacks and reduces the time required for the control procedure by identifying the NSF or setting the device.

Configuration of the Invention In order to achieve the above object, the transmission control procedure shortening method for a facsimile apparatus according to the present invention is configured as shown below. That is, according to CCITT Recommendation T30,
Non-standard equipment signal NSF that allows mutual communication with the other receiver on G3 machines using non-standard equipment signal NSF
is detected, the transmitting subscriber identification signal TSI is not sent, the non-standard equipment setting signal NSS containing the device identification information ID is sent, and the non-standard equipment setting signal NSF, which allows mutual communication with the receiver of the other party, is output. When the digital identification signal DIS is detected, the transmission subscriber identification signal TSI and the digital command signal DCS are sent out. Furthermore, equipment identification information bits are added to the non-standard equipment signal NSF, making it possible to set the transmission of the called subscriber identification signal CSI and to set the transmission setting to be prohibited. Also, when a non-standard equipment signal NSF that is capable of mutual communication with the other receiver and includes preamble transmission time reduction information is detected, the preamble time of the control signal transmitted after the detection of the non-standard equipment signal NSF is shortened, and the preamble is transmitted. Sends a non-standard equipment setting signal NSS that includes time saving information. And non-standard equipment signals
When transmitting NSF, a preamble that includes preamble transmission time reduction information and complies with CCITT Recommendation T30 is added, and when a non-standard equipment setting signal NSS containing preamble transmission time reduction information is detected, the non-standard equipment setting signal NSS is detected. By shortening the preamble time of control signals to be transmitted thereafter, etc., a method for shortening transmission control procedures can be obtained, which is characterized by shortening the time required for transmission control procedures of a facsimile apparatus.

DESCRIPTION OF EMBODIMENTS OF THE INVENTION Next, a preferred embodiment of the present invention will be specifically described with reference to the drawings.

FIG. 3 is a flowchart showing one embodiment of the present invention. At the beginning, it waits for the digital identification signal DIS, and if the digital identification signal DIS is not received, it branches to NO, goes through other flowcharts (not shown) including timeout, and returns to the beginning of the flowchart as shown by the dotted line. return. When the digital identification signal DIS is received, it branches to YES and checks whether the non-standard equipment signal NSF was received before receiving the digital identification signal DIS.
If the non-standard equipment signal NSF is received after receiving the digital identification signal DIS but before receiving the digital identification signal DIS, the compatibility of the non-standard equipment signal NSF is checked.

Figure 4 shows the format of the NSF frame.
In the figure, reference number 1 indicates a country code, 2 indicates a mechanical code, 3 indicates a model code, and 4 indicates a function and device identification information ID, each of which is separated by byte. Non-standard equipment signal
If FIF fields 1 to 3 in the NSF are verified, the process branches to YES and a non-standard equipment setting signal NSS containing ID information is sent out.

Non-standard equipment signal after receiving digital identification signal DIS
If the NSF is not received or if the codes shown in 1 to 3 in the FIF field are not verified even if the NSF is received, the transmitting subscriber identification signal TSI and the digital command signal DCS are transmitted.

Figure 5 shows the flowchart in Figure 3.
FIG. 6 is a diagram illustrating a part of the control procedure in the case of NSF compatibility, and FIG. 6 is a diagram illustrating a part of the control procedure in the case of non-NSF compatibility in the flowchart of FIG. 3. As a result, if the non-standard equipment signal NSF compatibility is present, the identification information is transmitted by the non-standard equipment setting signal NSS, and if the NSF compatibility is not present, the identification information is transmitted by the transmitting subscriber identification signal TSI. , if there is NSF compatibility, the transmitting subscriber identification signal TSI can be omitted in communication within the company's own equipment, and the transmission time can be shortened by about 0.75 seconds.

Next, the flowchart shown in FIG. 7 will be explained. The figure is a flowchart showing whether or not there is communication with other models. If there is no communication with other models, that is, if communication is only between own devices, the setting for prohibiting the transmission of the called subscriber identification signal CSI is set. conduct. When communicating with other models, make settings to send the called subscriber identification signal CSI. The specific method of setting is based on the deep switch, etc. inside the device. Figure 8 shows part of the control procedure for communication between in-house equipment using this setting. In this case, the other party is identified using the ID information set in the non-standard equipment signal NSF, and communication with other models is performed. A part of the control procedure in the case of is shown in Fig. 9,
In this case, the called party can be identified using the called subscriber identification signal CSI. Therefore, in the case of communication only between own devices, the called subscriber identification signal CSI can be omitted, and the transmission time can be shortened by about 0.75 seconds.

Next, the flowcharts shown in FIGS. 10 and 11 will be explained. The flowchart in FIG. 10 shows that when the digital identification signal DIS is received and the non-standard equipment signal NSF containing preamble abbreviation information is detected, the preamble of the control signal to be transmitted thereafter is shortened, and the non-standard equipment signal NSF containing the preamble abbreviation information is shortened. This indicates that the preamble of the control signal is not shortened when the standard equipment signal NSF is not detected.

FIG. 11 shows that when a non-standard equipment setting signal NSS containing preamble shortening information is detected, the preamble of the control signal to be sent thereafter is shortened, and a non-standard equipment setting signal NSS containing preamble shortening information is
When is not detected, it indicates that the preamble is not shortened. In the control procedure diagram in Figure 1, TSI, NSS (DCS), CFR, EOP,
If the MCF and DCN preambles are shortened from 1 second to 0.4 seconds, it is possible to shorten the time required for a control procedure by 3 seconds for one communication.

Including the procedure shortening described above, it is possible to shorten the transmission control procedure by about 4.5 seconds in total.

It goes without saying that the above control can be easily realized by using a processor and its software.

Effects of the Invention As explained above, when the non-standard equipment signal NSF is identified, the present invention prohibits the transmission of the sending subscriber identification signal TSI and responds only with the non-standard equipment setting signal NSS. , Prohibits the transmission of the called subscriber identification signal CSI through internal settings, adds preamble shortening information to the non-standard equipment signal NSF and non-standard equipment setting signal NSS, and shortens the preamble time after detection of these control signals. Therefore, the control time can be easily shortened.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the transmission control procedure of G3 aircraft in accordance with CCITT recommendation T30, Fig. 2 is a diagram showing the format of a control signal using a binary code, and Fig. 3 is a flowchart showing an embodiment of the present invention. FIG. 4 is a diagram showing the format of a non-standard equipment signal NSF frame, and FIG. 5 is a diagram showing a part of the control procedure in the case of NSF compatibility in FIG. 3.
Figure 6 is a diagram showing a part of the control procedure in the case of non-NSF compatibility in Figure 3;
The figure is a flowchart showing whether there is communication with other models, Figure 8 is a diagram showing part of the control procedure between our own devices, Figure 9 is a diagram showing part of the control procedure between other models, and Figure 10 is a diagram showing part of the control procedure between other models. FIG. 11 is a flowchart showing another embodiment of the present invention. 1...Country code, 2...Mechanical code, 3
...Model code, 4...Code including function and ID, etc.

Claims (1)

[Claims] 1. Non-standard equipment signal NSF according to CCITT recommendation T30
When detecting a non-standard equipment signal NSF that allows mutual communication with the other receiver, a G3 device using , a non-standard equipment signal that can communicate with the other party's receiver.
A transmission control procedure shortening method for facsimile equipment, characterized in that when a digital identification signal DIS is detected without detecting an NSF, a transmitting subscriber identification signal TSI and a digital command signal DCS are sent. 2. Claim 1 further characterized in that equipment identification information bits are added to the non-standard equipment signal NSF to enable transmission setting and transmission prohibition setting of the called subscriber identification signal CSI. A method to shorten transmission control procedures for facsimile equipment. 3 Non-standard equipment signal NSF according to CCITT recommendation T30
When a G3 device using a G3 device detects a non-standard equipment signal NSF that is capable of mutual communication with the other receiver and includes preamble transmission time reduction information, the preamble time of the control signal sent after the detection of the non-standard equipment signal NSF is shortened. A method for shortening transmission control procedures for facsimile equipment, which is characterized by transmitting a non-standard equipment setting signal NSS that includes preamble transmission time reduction information. 4 When sending the non-standard equipment signal NSF, add a preamble that includes preamble transmission time reduction information and complies with CCITT Recommendation T30, and generate a non-standard equipment setting signal that includes the preamble transmission time reduction information.
3. Non-standard equipment setting signal when NSS is detected
4. The transmission control procedure shortening method for a facsimile apparatus according to claim 3, further comprising shortening the preamble time of the control signal sent after the detection of NSS.