JPS5986339A - Line test method - Google Patents

Abstract

PURPOSE:To grasp efficiently the state of a line by transmitting and receiving prescribed test data and discriminating the propriety at the operation of line test. CONSTITUTION:A panel 5 of an operating section 5 is arranged with a changeover switch SW8 of high/low speed MODEM, a DIP switch 9 for test bit number setting, and a test switch 13. The SW13 is turned on, SWs 8, 9 are operated, the total number of bits of test information to be received is set by operating SWs 8, 9, and after the line is caught, a receiving SW11 is depressed and a discriminating signal 14 of a station to be called is transmitted. The receiving of the signal 14 is detected at the transmission side, a transmission SW10 is depressed and a digital instruction signal 15 is transmitted. The receiving side detects a signal 15, data receiving bit rate information is read out during receiving and the bit rate is printed by a recording section 7.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a line test method, and more specifically, to a line test method in which test data for line testing is transmitted from a transmitter side to a receiver side, and a judgment result is displayed on the receiver side. It concerns testing methods.

BACKGROUND OF THE INVENTION In general, with facsimile machines, the only way to determine whether the machine is being used is to actually send and receive images.

Therefore, after the image transmission and reception are completed, it becomes clear that the line condition is poor, and the image transmission and reception must be performed again.
It was a waste of effort and time.

Purpose The present invention was made in order to eliminate the above-mentioned conventional drawbacks, and it is an object of the present invention to provide a line test method that allows the quality of the line condition to be grasped at a glance.

EXAMPLES Hereinafter, the present invention will be described in detail along with examples shown in the drawings.

Figure 1 and the following diagrams explain one embodiment of the present invention.
The figure shows T4 of CCITT (International Telegraph and Telephone Consultative Committee)
A schematic configuration of a G3 facsimile compliant with the recommendations is shown.

In FIG. 1, the symbol l indicates the line control circuit, and 2 indicates CCITT (7) V 2? ter, V2s
-t" is the high-speed modem, and 3 is the low-speed modem designated by the same <V21. Both are connected to the line control circuit 1 and the control unit 4 that controls the entire system.

The control unit 4 is operated by the operation unit 5. A document reading section 6 and an image recording section 7 are connected to the control section 4 .

On the other hand, FIG. 2 shows details of the operation panel of the operation section 5 shown in FIG. 1.

In Figure 2, the symbol 8 is a high-speed/low-speed modem selector switch, the symbol 9 is an old P switch for setting the number of test bits, the symbol 10 is a send button, 11 is a receive button, and 12 is a stop button. , 13 are test switches.

On the other hand, FIG. 3 shows a line test procedure when a high-speed modem is used.

First, when the transmit button is pressed on the transmitter side, if the receive button is pressed on the receiver side, the called station identification signal (CED) is sent.
+4 occurs.

After that, a digital command signal (DC3) is sent to the transmitter side.
15 is generated, and in response to this, a reception*i confirmation signal (CFR) 1B is generated on the receiver side. After this training,
Figure 4 explains the line test procedure when using a low-speed modem.If the send button is pressed on the transmitter side and the receive button is pressed on the receiver side, and if the receiving modem has Signal (CED) 17 is generated. Then, the transmitter side enters a preamble state.

Note that all of the above-mentioned signals comply with CCITT recommendation T30.

Next, the actual operation of the line test will be explained using flowcharts of operations when using a high-speed modem and when using a low-speed modem shown in FIGS. 5 and 6.

First, a case where the high-speed modem 2 is used will be explained.

First, turn on the test switch 13 of both the transmitter and receiver, turn the high-speed/low-speed modem changeover switch 8 to the high-speed modem side, that is, to the V27 ter/V29 side in FIG. The number of bits is set (step S1). After acquiring the line to be tested, the receiver presses the receive button 11 (step R1) and transmits the called station identification signal 14 (step R2).

On the transmitter side, after setting the transmission bit rate with the DIR switch 9, it is determined whether or not the called station identification signal 14 has been received (step S2), and the transmit button 10 is pressed (step S3).

After pressing the transmit button IO, the transmitter waits for a time period during which the called station identification signal 14 from the receiver will be completed, and then transmits the digital command signal 15 (step S4).

This digital command signal 15 includes information on the transmitter's line test data transmission bit rate.

The receiver determines whether or not a digital command has been received in step R3, and if so, reads out the bit rate information for data reception included in this digital command signal, and in step R4, the receiver determines whether or not a digital command has been received. The bit rate is set, and the bit rate is printed by the recording section 7 as shown in FIG.

Note that if it is determined in step R3 that the digital command signal 15 has not been received, a reception error occurs and the routine ends. Subsequently, in step R5, the receiver transmits a reception preparation confirmation signal 16 to inform the transmitter that preparations for receiving data have been completed.

At this time, the transmitter determines whether or not it has received the reception preparation confirmation signal in step s5, and if it has not received it, an error occurs and the routine ends. If the training signal is being received, a training signal is transmitted in step s6 in order to adjust the modem on the receiver side, and then the "1" signal is continuously transmitted until the stop button 12 is pressed. .

On the receiver side, after receiving the training signal and completing modem adjustment, the receiver starts receiving line test data (step R7) and displays the data (step R7'). ).

Then, the process advances to step R8. In step R8, it is determined whether the carrier detect signal CD is continuously at a low level for a certain period of time.

The receiver receives the carrier detect signal CD every time it receives data, and if it is determined in step R8 that the carrier detect signal is not at a low level continuously for a certain period of time, the process returns to step R7, and the carrier detect signal CD is continuously detected for a certain period of time. If it is determined that the level is low, it is assumed that the data transmission from the transmitter has ended, and the reception operation ends.

By the way, if the received data is "1", the recording section 7 prints black information, and if it is not "1", it increments the error pit number counter on the memory in the control section 4 and prints white information.

That is, as shown in FIG. 7, the black straight line is broken in the part where the error has occurred. This part is indicated by the symbol E.

As mentioned above, the transmitter is continuously transmitting data of "1", so if there is no error in the line, all the data received by the receiver should be "1". .

Therefore, if white information is printed as shown by the symbol E in FIG. 7, in other words, if no printing is performed, it can be seen at a glance that an error has occurred in the line.

In addition, if the transmitter continuously transmits a signal of "1" in step S7 after transmitting the training signal in step S6, it is determined in step S8 whether or not the stop button has been pressed, and it is determined whether the stop button has been pressed or not. If it is not pressed, the process returns to step S7, and if it is pressed, the line test transmission ends.

On the other hand, when the low-speed modem 3 is used, the operation is shown in FIG.

That is, after turning on the test switch 13, setting the changeover switch 8 to the V21 side, setting the total number of bits to be received by the DIR switch 9, and capturing the line to be tested, the receiver side performs the reception in step J1. Press the button and proceed to step J2 called station identification signal 17
Send.

On the other hand, on the transmitter side, it is determined in step 2 whether or not the called station identification signal 17 has been received, and the transmit button is pressed in step 2, and the called station identification signal 17 of the receiver is
Wait for the time that the transmission of .
Continue to send OJ data alternately.

Then, in step 6, it is determined whether or not the stop button has been pressed from the receiver side, and if it has not been pressed, the process returns to step 4.6 If the stop button has been pressed, the line test operation ends. do.

On the other hand, the receiver side receives a preamble in step J3, receives data in step J4, synchronizes with the data bits using the received preamble,
It is determined that the inverted data of "1" and "0" of the data received immediately before is the correct data at that time. If the data is correct, black information is printed on the recording section; if the data is incorrect, an error bit number counter in memory 2 in the control section 4 is incremented and white information is printed. Further, data is displayed in step J5.

On the other hand, the receiver constantly receives the carrier detect signal CD from the low-speed modem 3. Then, in step J6, it is determined whether or not this carrier detect signal CD is at a low level continuously for a certain period of time. If it is at a low level, it is assumed that the data transmission from the transmitter has ended, and the receiving operation is started. end. If it is determined that the carrier detect signal CD is not at a low level continuously for a certain period of time, the process returns to step J4 and the routine described above is repeated.

Effects As is clear from the above description, according to the present invention, switching means is provided for switching between normal facsimile operation and line test operation, and means for transmitting and receiving specific test data having a predetermined number of bits during line test operation. Since the system uses a method to determine whether the test data is correct or incorrect, it is possible to accurately grasp the status of the line in use, ie, the frequency of line errors, etc., without using any special equipment.

[Brief explanation of the drawing]

The figures explain one embodiment of the present invention. Figure 1 is a block diagram showing the schematic configuration of a facsimile machine, Figure 2 is a plan view of the operation section, and Figure 3 is a line diagram when using a high-speed modem. An explanatory diagram of the test procedure. Figure 4 is an explanatory diagram of the line test procedure when a low-speed modem is used. Figure 5 is a flowchart diagram explaining the control operation when a high-speed modem is used. Figure 6 is an explanatory diagram of the line test procedure when a low-speed modem is used. FIG. 7 is a flowchart diagram explaining the control operation when the printer is used, and FIG. 7 is an explanatory diagram showing the printing state. l...Line control circuit 2...High speed modem 3...
Low-speed modem 4...Control unit 5...Operation unit
6... Original reading section 7... Image recording section 8
...Selector switch 9...DIR switch lO
...Send button 11...Receive button 12...
・Stop button 13...Test switch Fig. 5 Fig. 6

Claims (1)

[Claims] Between transmitters and receivers connected by a line, the transmitter side transmits test data having a predetermined number of bits in addition to normal data, and the receiver side has a means for determining whether the test data at the reception port is correct. A line test method and method, characterized in that the line condition is tested by displaying the determination result.