JPH04319842A - Line failure information detection method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 detection method for detecting a fault occurring in a transmission path 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 that performs communication using a transmission line, if a fault occurs inside an exchange, it is detected and notified to a control means, and the control means
A line failure information detection method has been used in which a software interrupt is issued to execute a predetermined warning process.

By the way, FIG. 6 shows a method for detecting faults occurring on a transmission path using such a line fault information detection method.

In FIG. 6, a fault detection means 4 for detecting a fault 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 the control means 5 is notified of this.

[0005] When the control means 5 is notified of the fault output, the software causes an interrupt,
A warning process is executed and a warning means 6 such as a line printer is used to warn of the occurrence of a failure.

[0006]

[Problems to be Solved by the Invention] As mentioned above, the control means 5 also executes a warning process for a fault that occurs inside the exchange 2, but compared to the inside of the exchange 2, there is a warning process on the transmission line 1. Isolated failures occur frequently. That is, the failure output from the failure detection means 4 will occur frequently.

[0007] Therefore, in the control means 5, a software interrupt is generated every time a fault output occurs, so there is a problem that the actual communication capability is reduced.

[0008] The present invention has been made in view of the above points, and provides a line failure information detection method that can ignore single failures that occur on the transmission path and eliminate the reduction in communication speed caused by the control means. This is what we are trying to achieve.

[0009]

[Means for Solving the Problems] In order to solve the above problems, the present invention, as shown in the principle diagram of FIG. The following measures were taken in the communication line that notifies the control means 5 of the exchange 2 and executes a predetermined warning process.

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

The protection period setting means 7 periodically sets a certain protection period. The ratio detection means 8 is the fault detection means 4.
Fault information is inputted from the protection period setting means 7, and the percentage of the period during which a fault occurs in the transmission line 1 during the protection period set by the protection period setting means 7 is detected.

[0012] The notification means 9 is configured to notify the control means 5 when the ratio detection means 8 detects that a fault has occurred in the transmission line 1 for a period equal to or more than a predetermined ratio during the protection period.
Generates fault information output to notify the user of the occurrence of a fault.

[0013]

[Operation] The operation of the present invention will be explained below with reference to FIG.

In FIG. 1, exchange 2 is connected to transmission line 1 via interface 3, and when a failure occurs within exchange 2, failure information indicating the occurrence of a failure within exchange 2 is sent. The control means 5 is notified, and the control means 5 issues a software interrupt to operate the warning means 6.

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

That is, a single failure on the transmission line 1 is ignored. Next, in the ratio detecting means 8, if fault information has been generated for a certain percentage or more of the protection period, a fault information output is generated and sent to the notification means 9. The notification means 9 notifies the control means 5 of this fault information output. Control means 5
Then, similar to the above, a software interrupt is applied to activate the warning means 6.

That is, in the present invention, the occurrence of a fault in the transmission line 1 is monitored only during a protection period of a certain period, and the occurrence of a fault is notified to the control means 5 only when the fault has occurred at a certain rate or more during the protection period. and execute warning processing. As a result, frequent interruptions do not occur in the control means 5, and the adverse effect on communication speed can be suppressed.

The above are the minimum functions of the present invention, but the present invention can further add the following functions.

That is, a period changing means 10 for changing the length of the protection period set by the protection period setting means 7 is provided in the interface 3 to change the period for monitoring the occurrence of a fault in the transmission line 1. It may be possible to do so.

Separately or at the same time, it may be possible to change the failure occurrence rate during the protection period for generating failure information output. In any case, the situation of failure occurrence in the transmission line 1 and the degree to which it can be ignored are determined by experience and set appropriately.

[0021] Also, guarantee means 1 guarantees the failure information output generated by the notification means 9 for a period at least equivalent to the protection period.
1 may be provided. As a result, the control means 5 only needs to read out whether or not failure information is being outputted at regular intervals, which facilitates control.

Furthermore, the failure information from the failure detection means 4 or
If the notification switching means 12 is provided to selectively notify the control means 5 of one of the failure information outputs from the notification means 9, the user can either directly warn of the occurrence of a failure on the transmission line 1, or You can now choose to ignore any failures.

[0023]

Embodiments Hereinafter, embodiments of the present invention will be explained based on FIGS. 2 to 5.

First, FIG. 2 shows a block diagram of this embodiment. In FIG. 2, a period changing means 10 is provided within the interface 3 of the exchange 2, a guarantee means 11 is provided within the notification means 9, and a notification switching means 1 is further provided within the interface 3.
2 are provided.

[0025] The period changing means 10 changes the protection period set by the protection period setting means 7 according to a user's operation.

The guarantee means 11 guarantees that the failure information generated by the notification means 9 is output during the protection period. The notification switching means 12 inputs the failure information from the failure detection means 4 and the failure information output from the notification means 9 and notifies the control means 5 of either one.

When fault information or fault information output is input to the control means 5, an interrupt is generated by software, and a predetermined warning process is performed by the warning means 6.

Next, the operation will be explained with reference to the block diagram of the electric circuit shown in FIG. 3 and the time charts shown in FIGS. 4 and 5. In addition, FIG. 3 shows the protection period setting means 7 and the ratio detection means 8 of FIG.
, only the parts corresponding to the notification means 9, the guarantee means 11, and the notification switching means 12 are shown.

(1) In FIG. 3, the protection period setting means 7 explained in FIG.
A terminal 13 inputs the clock C, a terminal 14 inputs the clock B obtained by dividing the clock C by 1/16, and a D input inputs the clock C from the terminal 13 via a tri-state switch (hereinafter simply referred to as a switch) 15. While inputting to the terminal,
A D-type flip-flop (hereinafter simply referred to as D-FF) 17 inputs the clock B to the CP input terminal via the switch 16, and inputs the Q output of the D-FF 17 to the D input terminal and also inputs the clock B to the CP input terminal. DF to input clock B
F18, a NAND gate 19 which inputs the Q output of D-FF18 and the inverted Q output of D-FF17, and this NAND
AND gate 2 which inputs the output of gate 19 and the output of power-on reset input terminal 20 (“H” after power-on)
Consists of 1.

(2) In FIG. 3, the ratio detection means 8 has a terminal 2 which inputs a clock A obtained by dividing the clock C by 1/4.
2, this clock A is input to the CP input terminal via the switch 23, and the fault output E from the fault detection means 4 is
The output of the terminal 24 that inputs A,
It consists of a counter 26 that inputs to the B input terminal, and an AND gate 27 that inputs the QA, QB, and QC outputs of the counter 26.

(3) In FIG. 3, the notification means 9
An OR gate 29 inputs the output of the D gate 27 and the Q output of a J-K flip-flop (hereinafter referred to as J-K-FF) 28, inputs the B clock to the CP input terminal, and OR gates the J input terminal. The aforementioned J-K-FF28 which inputs the output of the gate 29, the J-K-FF30 which inputs the Q output of J-K-FF28 to the J input terminal and the C clock to the CP input terminal, and the J-K-FF28 which inputs the output of the gate 29, Input the Q output of K-FF30 to the J input terminal and connect the D-FF to the CP input terminal.
J-K-FF31 which inputs the Q output of 17 (this FF3
1 constitutes the guarantee means 11. ).

(4) In FIG. 3, the notification switching means 12 inputs the output of the switch 25, and also connects the switch 32 whose G terminal is connected to the terminal potential of the dip switch 34 via the inverter 35, and the J-K - It consists of a switch 33 which receives the Q output of the FF 31 (this "H" output serves as the fault information output) and has its G terminal connected to the terminal potential of a dip switch 34.

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

The output of the reset input terminal 20 is D-FF1.
7 and 18, and the reset terminals of JK-FF 30 and 31, and the output of AND gate 21 is input to the reset terminal of counter 26 and J-K-FF 28.

Further, the fault output E becomes "L" when a fault occurs in the transmission line 1. Furthermore, the counter 26 is
When the input terminal is "H", the rising edge of the clock A pulse is counted, and after three consecutive counts, the QA, QB, and QC outputs all become "H".

Next, the operation will be explained. First, the operation for ignoring a single failure in the transmission line 1 will be explained 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.

In FIGS. 4 and 5, ■ is the output of the AND gate 27, ■ is the Q output of the D-FF 17, and ■ is the AND gate 21.
's output, ■ indicates the Q output of J-K-FF31, and this ■
The “H” output is the fault information output EO generated by the notification means 9.
becomes. In (2), the same clock that is delayed by half a cycle of clock B appears compared to clock C.

At the Q output of the D-FF 18, the same clock that is delayed by one cycle of clock B appears from ■, and as a result, the same clock that is delayed by one cycle of clock B appears in ■, which has the same period as ■ and a width of one cycle of clock B.
An "L" pulse appears and this "L" pulse resets counter 26 and JK-FF 28. That is, counter 2
6 and JK-FF 28 are reset at the same cycle as the protection period set by one cycle of clock C.

When the failure output E as shown in FIG. 4 is input, the clock A rises twice during the period when it is "L", so all of the QA, QB, and QC outputs of the counter 26 are "L". The signal does not become "H", and the output (2) of the AND gate 27 remains "L" and does not change. Therefore, J-K-FF28
, 30, 31, "H" is not input to the J input terminals, and J
- The Q output of the K-FF 31 does not become "H", that is, the failure information output EO does not occur.

Next, in FIG. 5, the notification means 9 outputs the fault information E.
The operation of generating O will be explained. As shown in Figure 5, for a long period of time “L”
'' is input, in the first part, the counter 26 counts the second rising edge of the clock A after the failure output E becomes "L", and the counter 26 inputs "L" of ■. ” is reset by the pulse, so ■
does not become "H".

When the next count starts, the counter 26 counts the rising edge of the clock A three times in a row, so that the AND gate 27 is turned on at the third rising edge of the clock A, which is indicated by the broken line A in FIG. Output ■ becomes "H".

[0042] After ■ becomes “H”, J-K-FF28
When the next falling edge of the clock B is input to the CP input terminal of the J-K-FF 28, the Q output of the J-K-FF 28 becomes "H". J-K
-J-K-FF after the Q output of FF28 becomes "H"
When the next falling edge of the clock C is input to the CP input terminal of the J-K-FF 30, the Q output of the J-K-FF 30 becomes "H". J
- After the Q output of K-FF30 becomes "H", J-K-
At the point indicated by the broken line B in FIG. 5 when the next falling edge of the Q output of D-FF17 is input to the CP input terminal of FF31, J-K-F
The Q output of F31 becomes "H", and from this point on, the fault information output EO is generated.

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, interrupts it by software, and the warning means 6 performs a warning process such as outputting it to the printer.

As is clear from the above, while the counter 26 is reset at intervals equal to one cycle of the clock C,
That is, during the protection period, the fault information output EO is generated and notified to the control means 5 only when a fault output E of a length that can count the clock A three times in a row is input. That is, a warning is issued only when the failure output E has occurred for a period longer than the length of the protection period that can count three successive rises of the clock A. As a result, a single failure in the transmission line 1 is ignored, and a warning process is performed only when a failure occurs even in a length longer than the above-mentioned ratio.

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

[0046] The Q output of J-K-FF28 is as follows
It is reset to "L" by the "L" pulse, and the J-
The Q output of K-FF30 becomes “L” at the next falling edge of clock C.
"It has become. Therefore, the Q output of the J-K-FF 31 becomes "L" when the falling edge of ■ is input to the CP input terminal at the time indicated by the broken line C in FIG. 5, and the failure information output EO is stopped. That is, the failure information output EO is guaranteed to maintain its state for one period of the clock C. As a result, even when the fault information output EO is read by the control means 5, it is only necessary to read it at least at the same cycle as the clock C, so monitoring by software only needs to be performed at a fixed cycle, making control easier.

[0047] Now, when the dip switch 34 is opened,
Switch 32 is open and switch 33 is closed. As a result, the fault information output EO is blocked by the switch 33, and the "H" output of the fault information E is output via the switch 32.
The control means 5 is notified from the output terminal 36 as is. Therefore, it is possible for the user to directly issue a warning for a failure that occurs on the transmission line 1 at his or her discretion.

It should be noted that the above embodiment is only one means for achieving the present invention, and in particular, the electric circuit shown in FIG. 3 can be modified in various ways without departing from the gist of the present invention.

[0049]

[Effects of the Invention] As described above, according to the present invention, only when a failure occurs in a transmission line at a certain rate or more during a protection period of a certain period, the control means is notified of the occurrence of a failure and a warning process is executed. Since this is executed, one-off failures that frequently occur on the transmission path can be ignored, thereby preventing a reduction in the communication speed of the control means due to frequent interruptions.

[Brief explanation of drawings]

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

FIG. 2 is a block diagram of an embodiment of the 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 the operation of ignoring a single failure according to the present invention.

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

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

[Explanation of symbols]

1 Transmission line 2　Exchange machine 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. Safeguards 12 Notification switching means

Claims (3)

[Claims] 1. Communication for notifying the control means (5) of the exchange (2) of fault information from a fault detection means (4) for detecting a fault occurring in the transmission path (1) and executing a predetermined warning process. protection period setting means (7) for periodically setting a certain protection period in the line; and rate detection means (8) for inputting the fault information and detecting the percentage of fault occurrence on the transmission line during the protection period. ), and a notification means (9) that generates failure information output for notifying the control means of the occurrence of a failure.
), the notification means (9) is configured such that the ratio detection means (8) detects that the transmission line (1
), the line fault information detection method is characterized in that the fault information is output when it is detected that a fault has occurred in the circuit. 2. The line failure information detection method according to claim 1, wherein the protection period set by the protection period setting means (7) can be changed arbitrarily. 3. The line failure according to claim 1, wherein the notification means (9) guarantees output of the failure information for at least a period equivalent to the protection period when the failure information output occurs. Information detection method.