JP2004023601A - Multi-line compatible communication terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the efficiency and reliability of communication by enabling retransmission when a communication error occurs, by switching to an idle line having better line quality. <P>SOLUTION: A multi-line compatible communication terminal device is connected to a plurality of communication lines L1, L2, etc., and comprises a communication control section 51. The communication control section 51 monitors the operation of all communication lines L1, L2, etc., interrupts communication when a communication error occurs in any communication line L1, and continues the interrupted communication by switching to a communication line L2 etc., selected from among the idle communication lines L2 etc., set to a communication rate lower than that of the communication line L1 wherein the error occurs. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement of a multi-line compatible communication terminal device connected to a plurality of communication lines.
[0002]
[Prior art]
Conventionally, in a multi-line compatible communication terminal device connected to a plurality of communication lines, transmission is performed from the first line. However, if a communication error occurs during this transmission, after waiting for a predetermined time, the first line is transmitted. Retransmission is performed, or another free line is selected on the user side and retransmitted.
[0003]
[Problems to be solved by the invention]
However, when retransmission is performed from the first line after a lapse of a predetermined time, a communication error occurs again, and after such retransmission is repeated, it is finally determined that transmission is impossible, and the communication is interrupted.
[0004]
Further, even when another empty line is selected and retransmitted, the selected other empty line has the same line quality as the first line, so that a communication error occurs and a similar problem occurs. .
[0005]
As described above, in the conventional multi-line compatible communication terminal device, since these communication lines are selected regardless of the quality of the line quality, there is a possibility that the communication line having the poor line quality may be used many times. As a result, there has been a problem that reliability is poor due to a line load, an increase in communication fee, a failure to reach communication, a delay in communication, and the like.
[0006]
The present invention has been made in view of the above circumstances, and when a communication error occurs, switches to a free line with high line quality and retransmits the communication, thereby improving the communication reliability of the multi-line communication. It is intended to provide a terminal device.
[0007]
[Means for Solving the Problems]
To achieve the above objectives,
In the multi-line compatible communication terminal device according to claim 1, the communication control unit monitors the operation states of all communication lines, and interrupts communication when a communication error occurs in any one of the communication lines; The communication line is switched from the idle communication line to a communication line set to a lower communication speed than the communication line in which the communication error has occurred, so that the interrupted communication is continued.
[0008]
Therefore, it is not necessary to retransmit using a communication line with poor line quality many times, and re-transmit from the middle using a vacant communication line with good line quality. And communication reliability can be increased.
[0009]
The communication terminal apparatus according to the second aspect of the present invention includes a switch setting unit configured to set in advance a communication line to be switched and selected when a communication error occurs.
[0010]
Therefore, when a communication error occurs, transmission can be performed using a communication line with good line quality or infrequently used which is set in advance by the user side, so that communication efficiency can be improved and communication reliability can be reliably increased. it can.
[0011]
According to a third aspect of the present invention, each communication line includes a level setting means for setting a communication speed and a signal output level.
[0012]
Therefore, each communication parameter can be changed for each line on the user side, and communication reliability can be further improved.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an example of a multi-line compatible communication terminal device according to the present invention. Here, the configuration of the multi-line compatible facsimile apparatus F is shown as a multi-line compatible communication terminal device, but the present invention is not limited to this, and may be a multi-line compatible personal computer or the like.
[0014]
In the figure, reference numeral 1 denotes a control unit, a main control unit for controlling the following units, 2 an NCU for controlling connection to a plurality of communication lines L1, L2,... Ln, and 3 a signal for facsimile communication. A modem for modulating and demodulating, 4 an image memory for temporarily storing image data, 5 a RAM for storing various data, 6 a ROM in which control programs and the like are stored in advance, 7 a display unit composed of a liquid crystal screen, LEDs, etc. Reference numeral 8 denotes an operation unit including various operation keys, 9 denotes a reading unit that reads an image from a set document, and 10 denotes a facsimile-received image or an image that is read from the reading unit 9 on a recording paper set in advance. It is a recording unit for recording.
[0015]
The RAM 5 includes a communication control unit 51. The communication control unit 51 monitors the operation states of all the communication lines L1, L2,... Ln, and when a communication error occurs in any one of the communication lines, for example, L1. The communication is interrupted and switched from the idle communication lines L2,... Ln to a communication line set at a lower communication speed than the communication line L1 in which the communication error has occurred, for example, L2, and interrupted. Communication is continued.
[0016]
Reference numeral 11 denotes switching setting means for setting in advance a communication line to be switched and selected when a communication error occurs among a plurality of communication lines L1, L2,... Ln. , L2,... Ln are level setting means capable of setting a communication speed and a signal output level.
[0017]
FIG. 2 is a flowchart showing the basic operation of the multi-line compatible facsimile apparatus F having such a configuration.
[0018]
First, when the calling number of the transmission destination is specified and transmission is started, the communication control unit 51 determines whether communication has been started, or whether communication has been normal or a communication error has occurred for the communication line used. It is determined whether or not it is (S1, S2).
[0019]
At this time, if no communication error has occurred, the data is transmitted to the transmission destination from the communication line (for example, the communication line L1) that has started transmission as usual.
[0020]
On the other hand, when the communication control unit 51 determines that a communication error has occurred, the communication of the communication line (for example, the communication line L1) is interrupted, and if the communication line preset by the switch setting unit 11 has been set, Is transmitted to the destination from the set communication line (for example, communication line L2) (S3, S4).
[0021]
Here, as the communication line to be switched in advance, a communication line closest to the communication line in which a communication error has occurred, a communication line set to the lowest speed, a communication line with a high frequency of use, and the like are preferably set.
[0022]
If the setting by the switching setting means 11 is not performed, the communication control unit 51 interrupts the communication on the communication line (for example, the communication line L1), and the other communication lines L2. Among them, a communication line (for example, communication line L2) set to a lower communication speed than the communication line L1 in which the communication error has occurred is determined (S5).
[0023]
Next, after switching the communication line L1 to the communication line L2 having a lower communication speed, the interrupted communication is resumed and transmitted to the destination (S6).
[0024]
Note that the communication speed means a communication speed of a modem, and the communication speed of the modem is usually set to a maximum. The communication speed falls down depending on the line state. It is also possible to set the communication speed and signal output level of the communication lines L1, L2,... Ln.
[0025]
【The invention's effect】
As you can see from the above explanation,
According to the multi-line compatible communication terminal device according to the first aspect of the present invention, the communication control unit suspends communication when a communication error occurs in the communication line, and selects one of the idle communication lines. The communication line is switched to a communication line that is set to a lower communication speed than the communication line that caused the communication error, and the interrupted communication is continued. It is not necessary to repeat retransmission, and communication efficiency can be improved and communication reliability can be improved.
[0026]
According to the multi-line compatible communication terminal device according to the second aspect of the present invention, since the switching setting means is provided, when a communication error occurs, a communication line having good line quality is selected and communication is resumed. Therefore, communication efficiency can be improved, and communication reliability can be reliably improved.
[0027]
According to the multi-line communication terminal device according to the third aspect of the present invention, since the level setting means is provided, each communication parameter can be changed for each line, and the communication reliability can be further improved. Can be.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an example of a main configuration of a multi-line compatible communication terminal device of the present invention.
FIG. 2 is a flowchart showing a basic operation of the multi-line compatible communication terminal device of the present invention.
[Explanation of symbols]
F: Multi-line compatible facsimile machine (multi-line compatible communication terminal device)
L1 to Ln Communication line 1 Main control unit 51 Communication control unit 11 Switching setting unit 12 Level setting unit

Claims (3)

In a multi-line compatible communication terminal device connected to a plurality of communication lines,
Monitors the operation status of all communication lines, suspends communication when a communication error occurs in any of the communication lines, and preliminarily selects the idle communication line from among the communication lines in which a communication error has occurred. A multi-line compatible communication terminal device, comprising: a communication control unit that switches to a communication line set to a low communication speed and continues interrupted communication. In claim 1,
A multi-line compatible communication terminal device, comprising: a switching setting unit that enables the communication control unit to preset a communication line to be switched and selected when a communication error occurs. In claim 1,
A multi-line compatible communication terminal device, wherein each of the communication lines includes level setting means for setting a communication speed and a signal output level.

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