JPS62188551A - Facsimile abbreviated communication system - Google Patents

Abstract

PURPOSE:To reduce the required time for one communication unit by sending a non- standard equipment setting signal or a digital instruction signal in response to the communication capability at the reception side to the reception side and sending immediately a picture signal without sending a training check signal. CONSTITUTION:At the time of a reception station is started from a transmission station, an NSF signal, a CSI signal and a DIS signal are sent to the transmission station as initial identification signals to send the capability of the called station to the transmission station. The capability sent from the reception station is discriminated and the reception station is confirmed to have a predetermined abbreviation communication capability, then the transmission station sends a TSI signal and an NSS signal as incoming instruction signal to the reception station to instruct the execution of the abbreviation communication to the reception station and starts sending a picture with a required time of interval. The reception station receiving the picture signal applied error check and if no error comes, the reception confirmation is informed to the transmission station in the fully duplex way by using a signal such as a tone and the transmission station receiving the reception confirming signal continues the succeeding picture signal transmission.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a facsimile communication system, and in particular,
Regarding the shortened communication method of Recommendation T30.

[Conventional technology]

Conventionally, in this type of facsimile communication system, as shown in FIG.
Sends a check (TCF) signal.

When the receiving side receives these signals and confirms that it is in a state where it can receive two-picture signals, it sends a reception confirmation signal (CFR).
i Send. The transmitter receiving this signal starts transmitting the 9-picture signal.

[Problem that the invention seeks to solve]

In this way, with the conventional facsimile communication method.

Only after transmitting a training check signal and exchanging a reception confirmation signal (CFR) in response to the training check signal does the transmission of the image signal begin. The time required for these training check signals and reception confirmation signals is about 2.5 seconds. This time length has become a value that cannot be ignored as the speed of facsimile communication increases, and the time required for one communication unit increases.
This method has the disadvantage that it wastes the line holding time.

The object of the present invention is to eliminate these drawbacks.

[Means for solving problems]

In the shortened facsimile communication system according to the present invention, the transmitting station receives a non-standard equipment signal (NSF) from the receiving side.
to confirm that the receiving station has this shortened communication capability,
A feature is that when the non-standard equipment setting signal (NSS) is used to instruct the execution of this shortened communication, the transmission of the conventional training check signal (TCF) is omitted and the transmission of all image signals is immediately started. do.

[Implementation row]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a control sequence diagram showing a first embodiment of the present invention. In Figure 1, when a receiving station receives a call from a transmitting station, it sends an NSF signal, a CSR signal, and a DIS signal to the transmitting station as initial identification signals.

While indicating that the called station is a facsimile machine,
It uses NSF signals to convey its capabilities to the transmitting station.

Next, when determining the capability transmitted from the receiving station and confirming that the receiving station has a predetermined short communication capability to which the present invention can be applied, the transmitting station transmits a TSI signal and an NSS signal as an incoming command signal. is sent to the receiving station to instruct the receiving station to execute the shortened communication method according to the present invention, and image signals for a predetermined number of lines are sent at predetermined time intervals.

The receiving station instructed by the incoming call command signal immediately starts receiving image signals, and when it confirms that the image signals for a predetermined number of lines have been accurately received, it sends a reception confirmation signal to the transmitting station. After this, the procedure according to the conventional CCITT recommendations is executed.

FIG. 2 is a control sequence diagram showing a second embodiment of the present invention. In Fig. 2, when the receiving station receives a call from the transmitting station, it receives an NSF signal and a C8I signal as an initial identification signal.
It sends a DIS signal to the transmitting station and conveys the capabilities of the called station to the transmitting station. Subsequently, upon determining the capability transmitted from the receiving station and confirming that the receiving station has a predetermined short communication capability applicable to the second embodiment of the present invention, the transmitting station transmits the incoming command signal. The TSI signal and the NSS signal are sent to the receiving station to instruct the receiving station to execute the shortened communication method according to the second embodiment of the present invention, and the sending of image signals is started at predetermined time intervals. This image signal is formatted for each predetermined number of bytes by HDLC (high level transmission control procedure), etc., and can be checked for errors.

The receiving station that received the image signal performs an error check,
If there is no error, a reception confirmation is notified to the transmitting station in full duplex using a signal such as a tone. The transmitting station that receives this reception confirmation signal continues transmitting image signals.

〔Effect of the invention〕

As explained above, the present invention completely eliminates the transmission of training signals and reception confirmation signals.

This has the effect that the time required during this time can be shortened, and therefore the time required for one communication unit can be shortened.

[Brief explanation of drawings]

Figure 1 shows 2 seams of the first embodiment of the present invention + Figure 2 shows 2
FIG. 3 is a sequence diagram of a second embodiment of the present invention. FIG. 3 is a diagram showing a conventional control sequence. In the figure, NSR is a non-standard equipment signal, C8I is a called station identification signal, DIS is a digital command signal, TSI is a transmitting station identification signal, NSS is a non-standard equipment setting signal, CF
R is a reception confirmation signal, and TCP is a training check signal. Figure 1 Figure 2

Claims (1)

[Claims] 1. In the digital facsimile communication system, after transmitting a digital command signal or non-standard equipment setting signal to the receiving side according to the communication capability of the receiving side, an image signal is immediately sent without sending a training check signal (TCF). A shortened facsimile communication method characterized by: