JPH1042117A - Facsimile equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To select an optimum communication system with a line characteristic and to execute communication which is economically superior by providing the communication function of V.34 of ITU and the respective communications of V.17, V.29 and V.27ter. SOLUTION: When the line characteristic is inferior and communication in the V.34 communication system of ITU is not realized midway, opposite party information and the communication system at that time and the result are stored in a storage part 2. At the time of re-transmission to the same opposite party, the main control part 1 takes out information from the storage part 2 and transfers them to a communication system selection part 7. The communication system selection part 7 judges that communication is not realized in the V.34 system for previous time and indicates 'the systems except for V.34' to a MODE control part 4 through a communication control part 3 based on the judgment of the communication system selection part 7. Then, it gives an indication to use V.17 or V.29 or V.27. Thus, communication with an opposite facsimile equipment is executed by the communication system except for V.34 through a MODEM part 6 and NCU 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus, and more particularly, to a facsimile apparatus of a G3 facsimile communication system recommended by ITU.

[0002]

2. Description of the Related Art Conventionally, a facsimile apparatus of this kind has been used for a plurality of modems V.1 which comply with ITU recommendations having different transmission speeds. 17,
V. 29, V.S. Using 27 ter, V.I. 17, V. 2
9, V. In each of the 27 ter modes, an error check by a training check (TCF) is performed at the start of communication, and communication is performed at an appropriate modem transmission speed according to line characteristics.

[0003] As a conventional transmission rate selection method, the TCF status is determined on the receiving side, and when it is determined that it is not appropriate, the transmitting side responds with "FTT" to cause the transmitting side to fall back sequentially (according to ITU recommendation). Method) A method of counting the TCF error bits on the receiving side, judging an appropriate transmission rate from the receiving side, and giving an instruction (Japanese Patent Laid-Open No. 2-1).
No. 46848). 17,
V. 29, V.S. By using fallback to each mode of 27ter, communication using an appropriate modulation method and transmission rate was performed.

[0004] In addition, V.1 of the ITU recommendation. A conventional facsimile machine using V.34 The same modulation scheme according to C.34 covers 33.6 kbps to 2.4 kbps, which is 17, V. 29, V.S. 27
ter, each speed is covered by the ITU recommendation. V.34 capability among facsimile machines. 34, the communication was only possible.

[0005]

The conventional facsimile apparatus has been disclosed in V.34 between facsimile machines having the functions of 34, since only communication using the modulation method according to V.34 is possible. When communication due to line characteristics or the like is not established between facsimile apparatuses having the 34 functions, there is a problem that communication is not established even if retransmission is performed unless the line characteristics change. (Purpose) Depending on the line characteristics, V.34 modulation scheme. 17, V. 29, V.S. In some cases, the 27 ter modulation method is superior. Therefore, V. Even between facsimile apparatuses having the F.34 function, depending on the line characteristics, V.34. 1
7, V. 29, V.S. In some cases, selecting the 27 ter conventional mode has better transmission efficiency and is economically superior.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a facsimile apparatus capable of selecting an optimum communication system according to line characteristics and performing an economically excellent communication system.

[0007]

SUMMARY OF THE INVENTION A facsimile apparatus according to the present invention is based on the ITU V.1. V.34 recommendations. 34, a facsimile apparatus having a communication function of the communication system
U.V. 17, V. 29 and V.I. Storage means for providing a communication function of each communication method according to each recommendation of 27 ter, and for storing information including a communication method used as a result of communication with the destination facsimile apparatus and a result of the presence or absence of a communication abnormality; Means for retransmitting when the transmission is not normally performed with the destination facsimile apparatus based on the information stored by the means. V.34 recommendations. When communication cannot be performed normally in communication using the V.34 communication method, the V.34 communication with the destination facsimile apparatus is performed based on a predetermined communication protocol. 17 or the aforementioned V.I. Re-communication is performed in each communication method according to each recommendation of 27ter.

A facsimile apparatus according to the present invention includes an NCU for interfacing with a communication line, and a V.N.
Other than V.34 modem, 17, V. 29, V27ter
A modem section including a modem, a modem control section controlling the modem section, a communication main control section performing communication control including control of retransmission when communication with the partner facsimile apparatus is not established, and a case of retransmission. V. V.34 using a V.34 modem. If the communication is not established in the V.34 communication method, the V.34 communication method is used. 34
Modem V. according to a predetermined procedure other than the modem V. 1
7, V. 29, V.S. A communication method selection unit for selecting a communication method by a modem of the 27ter, and information including "destination information", "communication method information", and "communication result information" when communication with the facsimile apparatus is started. It has a storage unit 2 for storing and a main control unit for controlling the whole.

[0009]

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

FIG. 1 is a block diagram showing an embodiment of the present invention.

In FIG. 1, a facsimile apparatus according to the present embodiment includes an NCU 5 for interfacing with a communication line,
Connect to NCU5 and Other than V.34 modem, 17,
V. 29, V.S. Modem part 6 including 27ter modem
And a modem control unit 4 for controlling the modem unit 6, a communication main control unit 3 for performing communication control including control of retransmission when communication with the other party's facsimile machine is not established, V.34 using a V.34 modem. If communication is not established in the V.34 communication system, The modem V.34 according to a predetermined procedure other than the modem V.34. 17, V. 29, V.S. 27t
and a communication method selection unit 7 for selecting a communication method by a modem in the er, and information including "partner information", "communication method information", and "communication result information" when communication with the partner facsimile apparatus is started. It has a storage unit 2 for storing and a main control unit 1 for controlling the whole.

FIG. 2 is a flowchart showing the determination of the communication result in the present embodiment, and FIG. 34 is a flowchart showing a determination of use of a modem other than 34.

Next, the operation of the present embodiment will be described with reference to FIG. 1, FIG. 2 and FIG.

When the facsimile apparatus of the present embodiment transmits data for the first time, the other party's facsimile apparatus and the V.V. V.34 using a V.34 modem. The communication is started by the 34 communication method. The other party's facsimile apparatus is the same as the facsimile apparatus of the present embodiment. 34 communication system and V.34. Communication methods other than 34 (using modem V.17, V29, V27ter)
Is possible.

As a result of communication with the other party's facsimile machine, as shown in FIG. 2, the communication result is NG (S11),
V. If no error is received from the partner machine (S13), an abnormal disconnection from the partner machine (S14), or an error retrain over (S15) occurs. 34 is determined to be the cause, and It is determined that the communication result by the 34 communication system is not established.

The line characteristics are poor and V. If the communication in the S.34 communication system is not established in the middle, the storage unit 2 stores the other party information, the communication system (V.34) at that time, and the communication result (unsatisfied).

Next, when retransmitting to the same destination, the main control unit 1 retrieves the previous "destination information", "communication method (V.34)" and "communication result (unsatisfied)" from the storage unit 2, and The information is passed to the communication method selection unit 7.

In the communication system selection unit 7, V.V. Then, it is determined that the communication system is not established in the communication system No. 34, and a communication system other than “V.34” is selected.

As shown in FIG. 3, the communication method selection unit 7 determines whether to select a communication method other than "V.34", first of all, as to whether or not retransmission is to be performed (S21). The method is V. 34 (S2).
2) If so, when the communication result is “communication not established” (S
23) is determined to be “other than V.34” (S2
4).

Based on the judgment of the communication system selection unit 7, the main control unit 1 sends the modem control unit 4 via the communication main control unit 3 "V.
34 ". 17, V. 29, V.S. 27t
er to be used.

Thus, the other party's facsimile apparatus and the V.V. Communication using a communication method other than 34 is performed.

In this case, the capability of the other party facsimile machine,
And the error situation of the TCF, the conventional V.30 standard according to the recommendation of T30 of the ITU. 17 / V. 29 / V. 27te
An appropriate communication method is selected from r.

[0023]

As described above, the present invention is based on ITU V.34 recommendations. In a facsimile apparatus having a communication function of the ITU-T 17, V.
29 and V.I. Storage means for providing a communication function of each communication method according to each recommendation of 27 ter, and for storing information including a communication method used as a result of communication with the destination facsimile apparatus and a result of the presence or absence of a communication abnormality; Means for transmitting data to the other party's facsimile machine based on the information stored by the means, V.34 recommendations. When communication cannot be performed normally in the communication using the V.34 communication method, the communication with the destination facsimile machine is performed based on a predetermined communication protocol. 17 or V.I. 29 or V.I. Re-communication in each communication method according to each recommendation of V.27ter, the line characteristics are poor and V.27ter. Even if the communication is not established in the 34 communication systems, there is an effect that the communication can be reliably established by selecting an appropriate communication system according to the line characteristics at the time of retransmission.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart illustrating determination of a communication result according to the present embodiment.

FIG. 3 is a block diagram of a communication system selecting unit according to the present embodiment; 3
9 is a flowchart showing a determination of use of a modem other than 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main control part 2 Storage part 3 Communication main control part 4 Modem control part 5 NCU 6 Modem part 7 Communication method selection part

Claims (2)

[Claims] 1. The ITU V.I. V.34 recommendations. In a facsimile apparatus having a communication function of a 34 communication method,
V. of the ITU. 17, V. 29 and V.I. Storage means for providing a communication function of each communication method according to each recommendation of 27 ter, and for storing information including a communication method used as a result of communication with the destination facsimile apparatus and a result of the presence or absence of a communication abnormality; Means for retransmitting when the transmission is not normally performed with the destination facsimile apparatus based on the information stored by the means. V.34 recommendations. When communication cannot be performed normally in communication using the V.34 communication method, the V.34 communication with the destination facsimile apparatus is performed based on a predetermined communication protocol.
17 or the aforementioned V.I. A facsimile apparatus for performing re-communication in each communication system according to each recommendation of 27ter. 2. An NCU that interfaces with a communication line.
And connected to this NCU Other than V.34 modem, 1
7, V. A modem unit including a V.29, V27ter modem; a modem control unit for controlling the modem unit; a communication main control unit for performing communication control including control of retransmission when communication with the partner facsimile apparatus is not established; The above V.1 when transmitting. V.34 using a V.34 modem. If the communication is not established in the V.34 communication method, the V.34 communication method is used. A modem V.34 according to a predetermined procedure other than the modem V.34. 17, V. 29, V.S. 27
and a communication method selection unit for selecting a communication method by a modem in the ter., and information including "destination information", "communication method information", and "communication result information" when communication with the other party facsimile apparatus is started. A facsimile apparatus comprising: a storage unit 2 for storing; and a main control unit for controlling the whole.