JP2911247B2 - Line fault information detection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line fault information detecting system for detecting a fault occurring in a transmission line of a communication line and executing a predetermined warning process by a control means of an exchange.

[0002]

2. Description of the Related Art Conventionally, in a communication line for performing communication using a transmission line, a fault occurring inside an exchange is detected and notified to control means.
A line failure information detection method of executing a predetermined warning process by interrupting by software has been used.

FIG. 6 shows a system for detecting a fault that occurs on a transmission line by using such a line fault information detection system.

[0006] In FIG. 6, a failure detecting means 4 for detecting a failure occurring on the transmission line 1 is provided in the interface 3 of the exchange 2 directly connected to the transmission line 1. When a fault on the transmission line 1 is detected, a predetermined fault output is generated, and this is notified to the control means 5.

[0005] When the fault output is notified, the control means 5 interrupts the software by the software, and
A warning process is executed, and the occurrence of a failure is warned by a warning unit 6 such as a line printer.

[0006]

As described above, the control means 5 executes a warning process also for a fault occurring inside the exchange 2, but on the transmission line 1 as compared with the inside of the exchange 2. Single injuries occur frequently. That is, the fault output from the fault detecting means 4 frequently occurs.

Accordingly, in the control means 5, since an interrupt is generated by software every time a fault output occurs, there is a problem that the actual communication performance is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides a line fault information detection system which can eliminate a single fault occurring on a transmission line and eliminate a decrease in communication speed caused by control means. It is what we are trying to realize.

[0009]

In order to solve the above-mentioned problems, the present invention provides a transmission line 1 as shown in the principle diagram of FIG.
In the communication line for notifying the control unit 5 of the exchange 2 of the fault information from the fault detecting unit 4 for detecting the fault that has occurred and performing a predetermined warning process, the following means is employed.

The present invention includes a protection period setting unit 7, a ratio detection unit 8, and a notification unit 9.

The protection period setting means 7 periodically sets a constant protection period. The ratio detecting means 8 includes the fault detecting means 4
, And detects a ratio of a period in which a failure has occurred in the transmission line 1 during the protection period set by the protection period setting means 7.

When the ratio detecting means 8 detects that a failure has occurred in the transmission line 1 during a period equal to or more than a predetermined rate during the protection period, the notifying means 9 controls the control means 5.
To generate a failure information output for notifying the occurrence of a failure.

[0013]

The operation of the present invention will be described below with reference to FIG.

In FIG. 1, an exchange 2 is connected to a transmission line 1 via an interface 3. If a failure occurs inside the exchange 2, failure information notifying the occurrence of a failure inside the exchange 2 is transmitted. The control unit 5 is notified, and the control unit 5 operates the warning unit 6 by interrupting by software.

The fault detecting means 4, the protection period setting means 7, the ratio detecting means 8 and the notifying means 9 are provided inside the interface 3. The failure detecting means 4 detects the occurrence of a failure in the transmission line 1 and sends it to the ratio detecting means 8 as failure information. On the other hand, the ratio detecting means 8 is the protection period setting means 7
, A fixed period of protection is set periodically. During this protection period, a period during which fault information occurs is detected, and when the ratio is less than a certain ratio, no output is generated.

That is, a single failure in the transmission line 1 is ignored. Next, when the ratio detecting means 8 generates fault information for a certain ratio or more in the protection period, a fault information output is generated and sent to the notifying means 9. The notifying means 9 notifies the control means 5 of this failure information output. Control means 5
Then, the warning means 6 is operated by interrupting by software as described above.

That is, according to the present invention, the occurrence of a failure in the transmission line 1 is monitored only during a protection period of a certain period, and the occurrence of a failure is notified to the control means 5 only when a certain percentage or more occurs during the protection period. Then, a warning process is executed. As a result, frequent interruptions do not occur in the control means 5, and adverse effects on the communication speed can be suppressed.

The above is the minimum function according to the present invention. In the present invention, the following functions can be further added.

That is, a period changing unit 10 for changing the length of the protection period set by the protection period setting unit 7 is provided in the interface 3 to change the period for monitoring the occurrence of a failure in the transmission line 1. You may be able to.

Alternatively or simultaneously, the rate of occurrence of a failure during the protection period for generating the failure information output may be changed. In any case, the situation of occurrence of a failure in the transmission line 1 and the degree of negligibility are determined by experience and set appropriately.

Also, the assurance means 1 for assuring the failure information output generated by the notification means 9 at least for a period equal to the protection period.
1 may be provided. As a result, the control means 5 has only to read at a fixed period whether or not the failure information output has occurred, thereby facilitating the control.

Further, the failure information from the failure detection means 4
By providing a notification switching unit 12 for selectively notifying the control unit 5 of any of the failure information output from the notification unit 9, the user can be warned of the occurrence of the failure in the transmission line 1 as it is, Obstacles can be arbitrarily selected to be ignored.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

First, FIG. 2 shows a block diagram of the present embodiment. In FIG. 2, the period changing means 10 is provided in the interface 3 of the exchange 2, the security means 11 is provided in the notifying means 9, and the notification switching means 12 is further provided in the interface 3. I have.

The period changing unit 10 changes the protection period set by the protection period setting unit 7 by a user operation.

The guarantee means 11 guarantees the failure information output generated by the notifying means 9 during the protection period. Notification switching means 12
Inputs the fault information from the fault detecting means 4 and the fault information output from the notifying means 9 to control either one of them.
Notify.

When the failure information or the failure information output is input to the control means 5, the control means 5 is interrupted by software, and the warning means 6 performs a predetermined warning process.

Next, the operation will be described with reference to the block diagram of the electric circuit of FIG. 3 and the time charts of FIGS. FIG. 3 shows only parts corresponding to the protection period setting means 7, the ratio detection means 8, the notification means 9, the security means 11, and the notification switching means 12 in FIG.

(1) In FIG. 3, the protection period setting means 7 described with reference to FIG.
, A terminal B for inputting a clock B obtained by dividing the clock C by 1/16, and a clock C from the terminal 13 via a tri-state switch (hereinafter simply referred to as a switch) 15. Input to the terminal,
A D-type flip-flop (hereinafter, simply referred to as D-FF) 17 for inputting the clock B to the CP input terminal via the switch 16 and a Q output of the D-FF 17 to the D input terminal and the CP input terminal A D-FF 18 for inputting a clock B, a NAND gate 19 for inputting a Q output of the D-FF 18 and an inverted Q output of the D-FF 17,
D-gate 19 output and power-on reset input terminal 20
("H" after the power is turned on).

(2) In FIG. 3, the ratio detecting means 8 is a terminal 2 for inputting a clock A obtained by dividing the clock C by １ ／.
2 and the clock A are input to the CP input terminal via the switch 23 and the fault output E from the fault detecting means 4 is output.
Is input through a switch 25 to A,
It comprises a counter 26 input to the B input terminal, and an AND gate 27 inputting the QA, QB, and QC outputs of the counter 26.

(3) In FIG. 3, the notifying means 9
An OR gate 29 for inputting the output of the D gate 27 and the Q output of a JK-flip-flop (hereinafter referred to as JK-FF) 28, inputting the B clock to the CP input terminal and ORing the J input terminal A JK-FF 28 for inputting the output of the gate 29, a JK-FF 30 for inputting the Q output of the JK-FF 28 to the J input terminal and inputting a C clock to the CP input terminal, The Q output of the K-FF 30 is input to the J input terminal and the D-FF is input to the CP input terminal.
JK-FF31 (this FF3
1 constitutes the security means 11. ).

(4) In FIG. 3, the notification switching means 12
The switch 32 receives the output of the switch 25 and connects the terminal potential of the dip switch 34 to the G terminal via the inverter 35, and the Q output of the JK-FF 31 (this “H” output is the failure information. And a switch 33 having the terminal potential of the dip switch 34 connected to the G terminal.

The outputs of the switches 32 and 33 are connected to an output terminal 36, and the output is input to the control means 5.

The output of the reset input terminal 20 is D-FF1
7 and 18, and input to the reset terminals of the JK-FFs 30 and 31, and the output of the AND gate 21 is input to the counter 26 and the reset terminal of the JK-FF.

The fault output E becomes "L" when a fault occurs in the transmission line 1. Further, the counter 26 has A, B
When the input terminal is “H”, the rising of the pulse of the clock A is counted, and when the count is performed three times in succession, the outputs QA, QB, and QC all become “H”.

Next, the operation will be described. First, the operation of ignoring a single failure in the transmission line 1 will be described with reference to the timing chart of FIG. It is assumed that the DIP switch 34 is closed, the switch 32 is closed, and the switch 33 is open.

4 and 5, the output of the AND gate 27, the Q output of the D-FF 17, and the AND gate 21
Indicates the Q output of the JK-FF 31, and the “H” output indicates the fault information output EO generated by the notifying unit 9.
Becomes Shows the same clock delayed by a half cycle of clock B from clock C.

At the Q output of the D-FF 18, the same clock delayed by one cycle of the clock B appears, whereby an "L" pulse having the same cycle and a width of one cycle of the clock B appears, This “L” pulse is output to the counter 26
And JK-FF 28 are reset. That is, the counter 26 and the JK-FF 28 are reset in the same cycle as the protection period set in one cycle of the clock C.

When the fault output E as shown in FIG. 4 is input, the rising edge of the clock A is 2 during the period when the fault output E is "L".
Therefore, all of the QA, QB, and QC outputs of the counter 26 do not become "H", and the output of the AND gate 27 remains "L" and does not change. Therefore, JK-FF2
“H” is not input to the J input terminals of 8, 30, and 31,
The Q output of the JK-FF 31 does not become “H”, that is, the failure information output EO does not occur.

Next, referring to FIG.
The operation for generating O will be described. Assuming that the failure output E of "L" is input for a long time as shown in FIG. 5, in the first part, the counter 26 measures the rising of the clock A from the time when the failure output E becomes "L" until the second time. At the time of counting, since it is reset by the "L" pulse, it does not become "H".

When the next count is started, the counter 26 counts the rising of the clock A three times in succession. Therefore, the AND gate 27 is turned on at the third rising of the clock A shown by the broken line A in FIG. The output becomes "H".

After becoming "H", JK-FF28
The Q output of the JK-FF 28 becomes "H" at the point when the next falling edge of the clock B is input to the CP input terminal of the JK-FF. J-K
-J-K-FF after Q output of FF28 becomes "H"
When the next falling edge of the clock C is input to the CP input terminal 30, the Q output of the JK-FF 30 becomes “H”. J
−K−FF− after the Q output of “H” becomes “H”
When the next falling edge of the Q output of the D-FF 17 is input to the CP input terminal of the FF 31, the J-K-F is obtained at the time indicated by the broken line B in FIG.
The Q output of F31 becomes "H", and a failure information output EO occurs from this point.

This fault information output EO is notified to the control means 5 from the output terminal 36 via the switch 33. The control means 5 reads this out, and performs a warning process such as interrupting by software and hitting the printer by the warning means 6.

As is clear from the above, while the counter 26 is reset after the same period as one cycle of the clock C,
That is, the fault information output EO occurs only when the fault output E long enough to count the clock A three times continuously during the protection period is input, and is notified to the control means 5. That is, a warning is issued only when the fault output E is generated at a rate equal to or longer than the ratio of the length that can count the rising of the clock A three times consecutively during the protection period. As a result, a single failure in the transmission line 1 is ignored, and a warning process is performed only when a failure has occurred even if the ratio is longer than the above ratio.

The protection period can be arbitrarily changed by changing the clocks C, A and B by the protection period changing means 10.

The Q output of the JK-FF 28 is reset to “L” by the next “L” pulse,
The Q output of the -K-FF 30 is "L" at the next falling edge of the clock C. Accordingly, the falling edge of the Q output of the JK-FF 31 at the time point indicated by the broken line C in FIG. 5 is input to the CP input terminal to become "L", and the fault information output EO stops. That is, the state of the fault information output EO is guaranteed for one cycle of the clock C. As a result, even when the fault information output EO is read by the control means 5, it is sufficient to read the fault information output EO at least in the same cycle as the clock C, so that monitoring by software only needs to be performed at a fixed cycle, and control becomes easy.

Here, when the dip switch 34 is opened,
The switch 32 opens and the switch 33 closes. As a result, the failure information output EO is blocked by the switch 33, and the "H" output of the failure information E is output via the switch 32.
The control means 5 is notified from the output terminal 36 as it is. Therefore, it is also possible to perform a warning process on a fault that has occurred in the transmission line 1 as it is by the user.

The above embodiment is merely one means for achieving the present invention, and the electric circuit of FIG. 3 can be variously modified without departing from the gist of the present invention.

[0049]

As described above, according to the present invention, the occurrence of a failure is notified to the control means only when a failure has occurred on the transmission line at a certain ratio or more during the protection period of a certain period, and the warning process is performed. Since it is executed, a single failure occurring frequently in the transmission path can be ignored, thereby preventing a decrease in the communication speed of the control means due to frequent interruptions.

[Brief description of the drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a block diagram of an embodiment of the present invention.

FIG. 3 is a block diagram of an electric circuit as an embodiment of the present invention.

FIG. 4 is a time chart illustrating an operation of ignoring a single failure according to the present invention.

FIG. 5 is a time chart illustrating a failure notification operation according to the present invention.

FIG. 6 is a block diagram showing a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 transmission line 2 exchange 3 interface 4 fault detection means 5 control means 6 warning means 7 protection period setting means 8 ratio detection means 9 notification means 10 period change means 11 security means 12 notification switching means

Claims (3)

(57) [Claims] Communication for notifying fault information from a fault detecting means (4) for detecting a fault occurring in a transmission line (1) to a control means (5) of an exchange (2) and executing a predetermined warning process. A protection period setting means (7) for periodically setting a fixed protection period in the line, and a ratio detection means (8) for inputting the failure information and detecting a failure occurrence rate on the transmission line during the protection period. ) And notifying means (9) for generating a fault information output for notifying the control means of the occurrence of a fault.
The notification unit (9) is configured to detect the failure when the ratio detection unit (8) detects that a failure has occurred in the transmission line (1) at a predetermined ratio or more during the protection period. A line fault information detection method for generating information output. 2. The line fault information detection system according to claim 1, wherein said protection period set by said protection period setting means (7) can be arbitrarily changed. 3. The line fault according to claim 1, wherein when the fault information is output, the notifying means (9) guarantees the fault information output for at least a period equal to the protection period. Information detection method.