JP3134616B2 - Signal condition monitoring 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 signal monitoring method for monitoring a plurality of signal states and notifying a host device when a change in the signal state is detected.

FIG. 7 is a diagram for explaining a signal monitoring method in an information network system. In the information network system shown in this figure, a host 1 and a plurality of terminal devices 2
Are connected via a dedicated line 3 and a plurality of signals a, b, c ~ from the dedicated line 3 are monitored by a monitoring switching device 4, and the state of a predetermined signal a ~ A change in the dedicated line 3 is detected by detecting a change, for example, the power supply to the dedicated line 3 is cut off, that is, for example, the power supply is cut off by a modem or the like supplying power to the dedicated line 3. When recognizing that, the event is notified to the console 10 of the higher-level device via the telephone network or the ISDN network, and the console 10 replaces the faulty dedicated line 3 with the telephone network,
Switching to the ISDN network.

If the signal system on the leased line 3 is, for example, V24 / 28 recommended by the International Telegraph and Telephone Consultative Committee (CCITT), for example, data set ready (DR), transmission permission (CS), data channel Reception carrier detection (During data reception) (CD) When it is detected that all switches from ON to OFF, it is recognized that the dedicated line system has been powered down (for example, the modem has been powered down) (PD), and the The occurrence of an event is notified to the console 10 via a public network, for example, a telephone network or an ISDN network. If the telephone network is used, a normal communication line is used. Notify using the channel, display PD on the display panel of the console 10,
From the console 10, the dedicated line 3 is connected to, for example,
Switch to the telephone network or ISDN network. Since the public network is used for notification of this event, dialing must be performed each time.

At this time, the monitoring switching device 4 samples and monitors the level of each of the signal lines (DR, CS, CD) with a predetermined sampling signal, and monitors the change of each signal a,.
(ON → OFF, OFF → ON)
When power is turned on or off on the dedicated line,
The plurality of (three in the above example) signals a,
Originally, it is necessary to change at almost the same time, but depending on the system, there is a problem that the state changes in time.

For example, if the off state of only the CD signal is detected, if the line is disconnected, or if the off state of only the CS signal is detected, it is recognized that there is no response to the transmission request, and an accurate event (for example, A plurality of signals a,
There is a problem that it is difficult for an operator to efficiently and accurately judge whether or not the power of the dedicated line system is changed when b and c change substantially simultaneously on the display panel of the console 10. In addition, the event is notified to the console 10 every time when the signal a,... Changes state separately, the number of times of using the public line becomes plural times, There are problems such as an increase in public line usage fees (costs) in telephone networks, etc., which are charged by, and even if there are variations in the plurality of signals a,. Therefore, there is a need for an effective signal state monitoring method that can accurately judge the signal condition.

[0006]

2. Description of the Related Art FIGS. 8 to 10 are diagrams for explaining a conventional signal state monitoring method. FIG. 8 is a conceptual diagram of a system configuration, and FIG. 9 is a time chart of a monitoring operation. 10 shows a format example of a signal for performing event notification.

[0007] As a conventional signal state monitoring method, a sampling method using hardware or firmware is often adopted. This method is a method of detecting a change in a signal by continuously sensing a sampling signal having a constant interval cycle or a program.

In the case of this method, the shorter the sampling interval is, the more accurate the state can be monitored, but on the other hand, unnecessary states such as noise or switch chattering are also monitored. In addition, there is an aspect that the processing for sampling increases, and the determination of the sampling interval is set to an appropriate interval depending on the purpose of the system.

By the way, according to the conventional sampling method, the timing for sampling a predetermined signal,
Since the changes of the signals a,... Are asynchronous, when monitoring a signal group having such a property that a plurality of signals a,. The detection timing and the change notification timing may be different.

FIG. 8 shows the plurality of signals, for example, the above-mentioned data set ready (DR), transmission permission (CS), and data at the supervisory switching device 4 in the information network system described in FIG. Channel receive carrier detection (during data reception) (CD) a, ~ are converted to signal Aa, signal B, respectively.
b, the change of each signal is detected as the signal Cc, and the power of the dedicated line system is cut off, specifically, the power is cut off by a modem or the like.
(PD) event is notified to the console 10 of the higher-level device (host) 1 via the public network (telephone network, ISDN network), and a PD on the display panel of the console 10 is displayed. This is shown conceptually.

FIG. 9 shows a sampling signal having a predetermined period in the monitoring and switching device 4, and the plurality of signals A
This is a time chart of the monitoring operation when monitoring the ON / OFF state of the signal a, the signal Bb, and the signal Cc.

As shown as "external signal state" in FIG. 9, a plurality of signals Aa, Bb, C
For example, if there is a difference in the change timing from off to on during the period c, in the sampling by the sampling signal having the illustrated period, the sampling time for detecting a signal change (this sampling time is A,
B and C), a deviation occurs as shown in the figure.

Therefore, at the time (A, B, C) when the state change of each of the signals Aa,... Is detected, the "internal monitoring flag" of FIG. 9 is turned on, and the changed state is maintained for a predetermined time (T = For example, it is assumed that the monitoring is performed by sampling with the sampling signal of the above-mentioned predetermined period to determine whether or not to continue the period of counting five sampling signals.

At this time, when a predetermined number of sampling signals are counted, it is determined that the monitoring condition is satisfied, the "internal monitoring flag" is turned off, and each of the signals A
The monitoring of the status change of a, .about. is terminated, but the above monitoring condition is satisfied (timing ▽ shown in FIG. 9).
A shift occurs in the timing when the “internal monitoring flag” is changed from ON to OFF, and each signal Aa, signal Bb, signal C
A plurality of events are detected in response to the timing at which the monitoring condition c is satisfied, and an event notification signal is sent to the upper console 10. The console 10 that has received the event notification signal returns a response signal, such as a normal reception, as a response signal.

FIG. 10 shows an example of the format of an event notification signal. For example, corresponding to each of the signals Aa, Bb, and Cc, a change flag bit (X) of each signal Aa to The status bit (Y) is provided, the change flag bit (X) = 0 indicates no change, the change flag bit (X) = 1 indicates change, and the current signal status bit
(Y) = 0 indicates that the signal is off, the current signal status bit (Y) = 1 indicates that the signal is on, and these signals are combined into one byte and Is configured to notify console 10 of

At this time, assuming that the state of the plurality of signals Aa to is as shown in FIG. 9, only the signal Aa is initially turned off at a certain sampling time A.
When it is detected that the internal monitoring flag has been turned on and the changed state continues for a predetermined monitoring time, for example, 5 sampling signals, the internal monitoring flag is turned on during that time and the monitoring condition is satisfied, the console In the event notification signal notified to 10, only the bit corresponding to the signal Aa is “11”, “00110000” (= 30: hexadecimal,
The event notification signal "30" is notified to the console 10 and is displayed on the display of the console 10 shown in FIG. 8 as an abnormality of the signal Aa.

Similarly, a certain sampling time B
, When the signal Bb changes from off to on, the signal Ab
Since a is in the on state and the signal Bb is changed from off to on, the event notification signal in the above format is "00011100" (= 1c), and the event notification signal "1C" is Is displayed on the display of the console 10 shown in FIG. 8 as an abnormality of the signal Bb.

Similarly, a certain sampling time C
, When the signal Cc changes from off to on, the signal A
Since the signal a and the signal Bb remain on and the signal Cc changes from off to on, the event notification signal in the above format becomes "00010111" (= 17), and the event notification signal "17" Is notified to the console 10, and the console 10
The signal C is displayed on the display or the like shown in FIG.
It is displayed as an abnormality of c.

At this time, the operator monitoring the display of the event notification of the console 10 is provided to the signal Aa, the signal Bb, and the signal Cc independently of the signal change (that is, each signal A, B, C system). Signal change due to an independently occurring abnormality),
It cannot be recognized as an event when the signal Aa, the signal Bb, and the signal Cc change almost simultaneously, that is, an event in which the power supply system in the system of the dedicated line 3 shown in FIG. 7 is disconnected (PD).

[0020]

Such a signal state monitoring method has the following problems. 1) Display accuracy Normally, when transmitting such a monitoring result to a higher-level device (console) which is a monitoring control device, a network such as a telephone network or an ISDN network is used as described above. If the timing is different, the dedicated line system error display on the console screen (multiple signals A,
B and C change almost at the same time, and should be displayed as a power failure of the dedicated line system 3, for example.) As described above, in each of the signals A, B and C,
Independently, it is displayed as if an error occurred.

This is only required if the time difference of the display is small, but if the time difference is large, it looks as if a plurality of events (above-mentioned plurality of abnormalities) have actually occurred. It is difficult to determine an abnormal event that has occurred on the leased line.

2) Economics of the line Normally, when such a monitoring result is transmitted to a higher-level device (console) which is a monitoring control device, as described above, when a public network such as a telephone network or an ISDN network is used. However, if the detection timing of multiple signals is different, the event notification to the host is also divided into multiple times, and in the case of a telephone network charged by the number of uses, the line usage cost increases, Use efficiency will be bad. Given the economics of communication costs, it has never been less frequently used.

[0023]

FIGS. 1 to 4 are diagrams schematically showing an embodiment of the present invention. FIGS. 1 and 3 show time charts of a monitoring operation, and FIGS. 4 shows an example of an event notification signal. The above problem is solved by a signal state monitoring method configured as follows.

The state of the plurality of signals Aa,... Is monitored by sampling signals at regular intervals, and the plurality of signals Aa,.
Is a signal state monitoring method for notifying an event to a higher-level device when a state change of a first signal a or b,..., Or c is detected by a certain sampling signal. In the above, other signals a, b, or c other than the first signal
Monitoring processing a to monitor whether or not the state change of the detected first signal a to continue for a predetermined number of sampling times until the next sampling time b for detecting the change of
Is put into a waiting state for a predetermined period, and the waiting state is released, and another signal a or b,.
Next sampling time b for detecting state change of c
Then, when a change in the other signal b〜 is detected, the first signal a ，, and the other signal b〜 are
The monitoring process a ~ is started, and the first signals a ~,.
At the time when the state change of the other signals b to continues for a predetermined number of sampling times and it is detected that the condition of the monitoring process a to is satisfied, the plurality of signals A are collectively collected.
a, a signal Bb, a signal Cc, a change detection event of
It is configured to notify the host device.

At this time, the detected first signals a to a
The waiting period in which the monitoring process of step (1) is in a waiting state is configured to be a period in which one or a plurality of sampling signals are counted.

[0026]

That is, in the signal state monitoring method according to the present invention, when a change in a certain signal Aa is detected at a certain sampling time a, the next sampling time or a period up to a sampling time b in which a plurality of sampling signals are counted. , Monitoring processing a to each signal Aa to
Is set to a waiting state, and the waiting state for the monitoring process a is released, and at the next sampling time b for detecting a change in the state of another signal a, b, or c, the other signal Bb to When a change in the state is detected, the monitoring process is simultaneously started for the certain signal Aa and the signals Bb to which have detected a change in the state of the signal at that time,
When the monitoring condition is satisfied, a plurality of signals Aa, B
The change information b) is combined into one event and notified to the host device at the same timing.

Therefore, it is possible to monitor the signal group a to continuously changing with a variation by accurate sampling, to notify an efficient event, and to realize a signal state excellent in display and economy. The effect of monitoring and notification of the detection result event can be obtained.

[0028]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIGS. 1 to 4 are diagrams schematically showing an embodiment of the present invention, FIG. 5 is a diagram showing an embodiment of the present invention by a hardware circuit, and FIG. FIG. 2 is a flowchart illustrating an embodiment of the present invention.

In the present invention, when a change in a certain signal Aa is detected at a certain sampling time a, one
Alternatively, a period for counting a plurality of sampling signals,
A monitoring process a to monitor whether or not the plurality of signals Aa,... Continue in the changed state for a certain period of time is put into a waiting state, and the waiting of the monitoring process a is released. When a change in another signal Bb ~ is detected at the next sampling time b for detecting a change in the state of the signal a or b, ~, or c, the signal A
a, and the other signals Bb-, which have detected the signal change, simultaneously start monitoring processes a, b,..., and when the monitoring conditions are satisfied, change information of the plurality of signals Aa, Bb- Means for notifying the higher-level device at the same timing as a single event are the means necessary to carry out the present invention. Note that the same reference numerals indicate the same object throughout the drawings.

The signal state monitoring method according to the present invention will be described below with reference to FIGS. [In the case of FIGS. 1 and 2 (the wait period of the monitoring process a to = 1)
First, in FIG. 1, when a change in the signal Aa is detected at a certain sampling time a, the occurrence of the change is stored in an internal monitoring flag, and the monitoring process a is waited for one sampling signal. Therefore, "1" is set in a wait counter (to be described later), and the monitoring process a is put into a wait state until the next sampling time b after one sampling signal. << Refer to the hatched portion of the internal monitoring flag in FIG. 1. >> At the next sampling time b, when a change in another signal Bb is detected, the signals Aa and Bb are detected.
, The monitoring processes a and b are started at the same time {that is, the state of the internal monitoring flag ON is counted}.

Monitoring condition {In this embodiment, the changing state (ie, the state in which the signal Aa and the signal Bb are on) during five sampling signals (indicated by T = 5).
If｝ is established, the change notification of the signals Aa and Bb is sent to the console 10 of the host device together. Thereafter, when a change in the state of the signal C is detected at the sampling time c shown in the figure, the waiting state of the monitoring processes a and b has already been canceled at that time. When the monitoring condition of the signal Cc is satisfied at the start, a signal of the event notification of the change of only the signal Cc is sent to the console 10 of the host device.

FIG. 2 shows the format of the event notification signal at this time. First, when it is detected that the signal Aa has been turned from off to on at a certain sampling time a, the signal Aa is kept until a predetermined period (that is, in this embodiment, the waiting period is a period of one sampling signal). After the monitoring process a for Aa is waited, and after the waiting of the monitoring process is released, the monitoring processes a and b are changed from the time when a change in the state of another signal Bb is detected at the next sampling time b. After the start, the changed state continues for a predetermined monitoring time, for example, five sampling signals, and the internal monitoring flag indicating that the monitoring processes a and b are being performed continues to be on during that time, and the monitoring condition is changed. When the condition is satisfied, in this case, the signals Aa and B
Since “b” has changed and the ON state has been continued, the event notification signal notified to the console 10 becomes “00111100” (= 3C), and the event notification signal “3
C "is reported to console 10.

Similarly, for the other signals Cc,
At the sampling time c shown in FIG.
Has been detected to have changed from OFF to ON, and at that time, the signals A and B continue to be ON, and the event notification signal notified to the console 10 is "00010111". "(= 17) and the event notification signal" 1
7 "is notified to the console 10. [In the case of FIGS.
First, in FIG. 3, when a change in the signal Aa is detected in the same manner as described above, the occurrence of the change is stored in an internal monitoring flag, and the monitoring process a is set to a wait state for three sampling signals. Then, "3" is set in a wait counter (to be described later), and the monitoring process a is set in a wait state for a period of three sampling signals. {Refer to the hatched portion of the internal monitoring flag in FIG. 3} Therefore, in the example of FIG.
Even if b changes from off to on and the corresponding internal hold flag is turned on, the monitoring process b for the signal Bb is also awaited.

In the example shown in FIG. 3, at the sampling time b after the waiting state of the monitoring process a is released, the signal Cc is detected from off to on, and the corresponding internal hold flag is turned on.

Therefore, at the sampling time b when the waiting period of the monitoring process is canceled, the signal A
a, monitoring processing for signals Bb, Cc
Is started.

Monitoring condition: In this embodiment, during the five sampling signals (indicated by T = 5), the changing state (that is, T = 5)
When the signal Aa, the signal Bb, and the signal Cc are on), the signal Aa, the signal Bb, and the signal Cc are transmitted to the console 10 of the host device.
In the above description, the event that the state has changed almost at the same time, that is, the event that the power is cut off (PD) in the dedicated line 3 is notified to the console 10 of the host device.

FIG. 4 shows the format of the event notification signal at this time. At first, when it is detected that the signal Aa is turned from off to on at a certain sampling time a, in this embodiment, the signal Aa and the signal B are output until the sampling time b after three sampling signals.
b, the monitoring process is put into a waiting state, and after the waiting of the monitoring process is released, a change in another signal Cc is detected at a sampling time b, and from that point on, the signals Aa, Bb, and Cc are When the monitoring processes a to c are started and the changed state continues for a predetermined monitoring time, for example, 5 sampling signals, the corresponding internal monitoring flag continues to be on during that time, and the monitoring condition is satisfied. In this case, the signals Aa, Bb, and Cc change from off to on, and the on state has continued for a predetermined period, that is, a period for counting five sampling signals. The event notification signal notified to the console 10 is "00111111" (= 3
F), and the event notification signal “3F” (this event notification indicates the disconnection of the power supply system in the dedicated line 3 described above) is sent to the console 10.

As described above, from the point in time when a change in a certain signal Aa is detected, the monitoring process is put into a waiting state only for one or a plurality of sampling signals.
The variation in the changes of the plurality of signals a to can be absorbed to detect the changes of the plurality of signals at the same time. By determining an appropriate number according to the state of variation of the plurality of signals a to in the information network system, effective state monitoring becomes possible.

FIG. 5 shows a monitoring method for monitoring whether or not the internal monitoring flag corresponding to each of the signals Aa to A remains on for a predetermined period, for example, a period for counting five sampling signals. 9 shows a specific configuration example of a circuit for processing a to a.

First, the signals Aa, Bb, C
The fact that one of the signals c has been turned from off to on at a certain sampling time a indicates that the sampling circuit 40
a, OR circuit (OR) 41, AND circuit (AN
D) A predetermined value, for example, “1” in the example of FIGS. 1 and 2 and “3” in the examples of FIGS. Processing Step 1 in FIG.
00, 101, a countdown is started by the sampling signal, and an internal monitoring flag corresponding to the signal Aa is turned on to monitor whether or not a change in the state of the signal Aa continues for a predetermined period. A value (T = 5 sampling signal) indicating the predetermined period is set in the processing circuit (counter) 44a. Since the monitoring processing waiting counter 43 is activated, the monitoring processing circuit (counter) 44a is set. Does not work. {See processing step 102 in FIG. 6} In the above, when “1” is set in the monitoring processing waiting counter 43, the monitoring processing wait is released at the sampling time b following the sampling time a, and the monitoring is stopped. A counter-down operation is started in the processing circuit (counter) 44a, and at the time when five sampling signals are counted, a signal indicating that the monitoring condition is satisfied is output and input to, for example, the decoder (DEC) 45. . {See processing step 103 in FIG. 6} In the example described with reference to FIGS. 1 and 2, at the time of the sampling time b, the monitoring processes a and b for the signals Aa and Bb are started and the monitoring conditions are satisfied. (At the time indicated by the symbol ▽ in FIG. 1), the signal Aa and the signal B
The event that b has changed from off to on is input to the decoder (DEC) 45, and a signal β indicating a predetermined event is output. ｛Figure 6
Similarly, if “3” is set in the monitoring process waiting counter 43, the above-mentioned sampling time “a” is set to “3”.
At the sampling time b, the wait counter 43 for the monitoring process becomes "0", the waiting for the monitoring process is released, and the counter down operation in the monitoring processing circuit (counter) 44a,. When the five sampling signals are counted, a signal indicating that the monitoring condition is satisfied is output and input to the decoder (DEC) 45. << Refer to processing step 103 in FIG. 6 >> The example described in FIGS.
This corresponds to the case where “3” is set in 43, and in this case, at the time of the sampling time b,
When the monitoring processes a, b, and c for the signals Aa, Bb, and Cc are started, and the monitoring conditions are satisfied (at the time indicated by the symbol in FIG. 3), the signals Aa and Bb
And the event that the signal Cc is changed from off to on is detected by the decoder (D
EC) 45, and a signal γ indicating a predetermined event (for example, a signal indicating power-off in the dedicated line system) γ is output. ｛Figure 6
As described above, according to the present invention, the present invention monitors the states of the plurality of signals Aa to Sampling signals at regular intervals, and when a signal change is detected, notifies the host apparatus of the signal monitoring and notification. In a method, at a sampling time a when a change of a certain signal a is detected with a certain sampling signal,
Until a predetermined number of sampling times, the monitoring process a to the self and other signals are put into a waiting state, a predetermined number of sampling signals are counted, and the time when the waiting state of the monitoring process is released ( Sampling time b)
Then, when another signal change b ~ is detected, the monitoring process a, b ~ is also started for the signal Bb ~ at the same time, and after a predetermined condition is satisfied, the changes of the plurality of signals are collectively collected by the host device. The feature is that the notification is made to the user.

[0041]

As described above in detail, according to the signal state monitoring method of the present invention, when the range of the variation is continuously within a predetermined range for a signal group that varies continuously and varies. Monitoring can absorb such variations, and can provide efficient notification to the higher-level equipment. This has the effect of monitoring the signal status, which is excellent in terms of display accuracy and economy, and notifying the detection result event. Can be

[Brief description of the drawings]

FIG. 1 schematically shows an embodiment of the present invention (part 1).

FIG. 2 is a diagram schematically showing one embodiment of the present invention (part 2).

FIG. 3 schematically shows an embodiment of the present invention (part 3).

FIG. 4 is a view schematically showing one embodiment of the present invention (part 4).

FIG. 5 is a diagram showing an embodiment of the present invention by a hardware circuit;

FIG. 6 is a flowchart showing an embodiment of the present invention.

FIG. 7 illustrates a signal monitoring method in the information network system.

FIG. 8 illustrates a conventional signal state monitoring method (part 1).

FIG. 9 illustrates a conventional signal state monitoring method (part 2).

FIG. 10 illustrates a conventional signal state monitoring method (part 3).

[Explanation of symbols]

1 Host 10 Console 2 Terminal device 3 Dedicated line 4 Monitoring switching device 40a to first sampling circuit 43 Monitoring processing waiting counter 44a to Monitoring processing circuit 45 Decoder (DEC) 100 to 104 Processing steps a to Signal A, Signal B, Signal C Sampling signal a ~ Sampling time for detecting changes in signals A, ... a ~ Monitoring process Monitoring condition notification, event notification Internal monitoring flag Monitoring processing waiting period

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04L 12/24-12/26 H04L 29/14 H04M 3/22

Claims (2)

(57) [Claims] 1. The state of a plurality of signals (a,...) Is monitored by sampling signals () at regular intervals, and when a state change of one or a plurality of signals (a,. A signal state monitoring method for notifying the first signal (a, b,..., Or c) in a certain sampling signal (). The monitoring process (a) for monitoring whether the detected state change of the first signals (a to) continues for a predetermined number of sampling times is set to a waiting state for a predetermined period (), and the waiting state is released. Then, at the next sampling time (b) at which a change in another signal (a, b, or c) is detected, a change in another signal (b-) other than the first signal is detected. If detected, the first signal (a, ~) and another signal (b ~), The monitoring process () is started,
The first signal (a-) and other signals (b-)
When it is detected that the state change of (a) has continued for a predetermined number of sampling times and the condition of the monitoring process (a) has been satisfied (), the detection event of the change in the plurality of signals is collectively transmitted to the host device. A signal state monitoring method, comprising: notifying (). 2. A monitoring process (a, b) for the detected first signal (a-) and other signals (b-).
The signal state monitoring method according to claim 1, wherein the period () in which (1) to (5) is in a waiting state is a period for counting one or a plurality of sampling signals ().