JPH02100431A - Automatic recovery system at the time of generation of in-multiplexing/separating device alarm - Google Patents

Abstract

PURPOSE:To shorten the data transmission cut-off time at the time of a fault by switching immediately and automatically the system to a normal system, when an in-device alarm is generated. CONSTITUTION:A pattern generating means 1 for generating pattern information for searching a fault of the respective transmission lines of a lower order group and a higher order group provides an output and adds it to a phase correcting means 2 and an output which is brought to phase correction is added to a comparing and deciding means 3 together with an output from a check system multiplexing part 12 and they are compared and decided. Subsequently, by inputting an output which is compared and selected to a selection control signal means 4 together with outputs of a first comparing part 13 and a second comparing part 23, a selection control signal is outputted. Accordingly, by using the selection control signal, two signals inputted to each of a first - a fourth means 5-8 are selected and switched, and when an in-device alarm is generated, the system is switched automatically to a normal system by deciding whether a fault occurs in a main system or a check system. In such a way, the data transmission cut-off time can be shortened.

Description

[Detailed Description of the Invention] [Summary] A circuit system that controls switching to a normal system immediately after a failure occurs and shortens data transmission interruption time, regarding a dual path check alarm monitoring system for digital multiplexing and demultiplexing equipment. The purpose of this system is to transmit low-order group information as high-order group information via the main multiplex section, and to transmit both information transmitted via a dual path between the main multiplex section and the check multiplex section. 1 Comparison section detects which path is at fault by comparison, and further transmits higher-order group information as higher-order group information via the main system separation section, and also connects the main system separation section and the check system separation section with a double path. A second comparing section compares both pieces of information transmitted through the transmission system to detect a failure in either path, and monitor the respective information transmitted through the transmission system and the reception system. a pattern generating means for generating pattern information for searching for faults in each double path of a higher order group; a phase correcting means for performing phase correction to delay the pattern information from the pattern generating means by a predetermined time; Comparing and determining means for comparing and determining the output from the means and the output from the check system multiplexing section, inputting the outputs from the first comparing section, the second comparing section and the comparing and determining means, respectively, and outputting a selection control signal. a selection control means for inputting a selection control signal from the selection control means to select and switch between a main system and a check system on each of the transmitting side or the receiving side, a first circuit connected to the low-order group input side; The main system includes a selection means, a second selection means connected to the high-order group output side, a third selection means connected to the high-order group input side, and a fourth selection means connected to the low-order group output side. The configuration is configured to determine whether it is a failure in the system or a failure in the check system, and automatically switch to a normal system.

[Industrial application field]

The present invention relates to a dual path check alarm monitoring system for digital multiplexing/demultiplexing equipment.

As a hierarchy of digital transmission systems in recent years, 64
Based on kbit, 1.544 Mbit for the primary group.

6.312 Mbit for 2nd order group, 32.0 for 3rd order group
64Mbit.

97.728Mbit for 4th order group, 39Mbit for 5th order group
7. Using a transmission speed of 200 Mbit,
A multiplexing device that multiplexes the n-th order group into the m-th order group allows audio,
Methods for transmitting voice and data, data, etc. are used.

In recent digital transmission systems, in order to increase the reliability of the system, failure monitoring and switching control of the transmission equipment itself are required, and furthermore, with the increase in data transmission speed, there is a demand for faster switching control.

For this reason, in a digital multiplexing/demultiplexing device, it is necessary to control switching to a normal system immediately after a failure occurs to shorten data transmission interruption time.

[Conventional technology]

FIG. 4 is a diagram showing the configuration of a conventional embodiment.

In the figure, 10 is a first interface section, II is a main multiplexing section consisting of a first transmitting side memory 111 and a first multiplexing section 112, and 12 is a second transmitting side memory 121 and a second multiplexing section 122.
13 is a check system multiplexing section consisting of a first comparison section,
Section 4 is a second interface section. Also, 20 is the third
21 is a main system separation section consisting of a first separation section 211 and a first reception side memory 212; 22 is a main system separation section consisting of a second separation section 221 and a second reception memory 222; 23 is a main system separation section consisting of a second separation section 221 and a second reception memory 222; The comparison section 24 is a fourth interface section.

The low-order group information (N-order group) of each channel on the outward path input to the first interface section 10 is transmitted to the first interface section 10.
The polarity of the signal is converted from a bipolar signal to a unipolar signal, and the signal is inputted to a main multiplexing section 1 and a check multiplexing section 12 to form an outgoing parallel path. Then, the main system multiplexer 11 transfers the input low-order group information to the first transmitting side memory 11.
1, the data is stored in a first-in, first-out manner and output after speed conversion.The output of the first transmitting side memory 111 is multiplexed with other channel information in the first multiplexer 11 and output as main system information. Similarly, the check system multiplexer 12 stores the input low-order group information in the second transmitting side memory 121 in a first-in, first-out manner, converts the speed, and outputs the input low-order group information to the second transmitting side memory 121.
The output of month 21 is sent to the second multiplexer 122 along with other channel information.
is multiplexed and output as check information. Further, the main system multiplexed information multiplexed by the first multiplexing section 112 is sent to the upper primary group via the second interface section 14 (N
+1) Output as high-order group information of the next group. At this time, the output of the main system multiplexer 11 and the check system multiplexer 1
Both outputs of 2 are input to the first comparison section 13, and the first comparison section 13 compares and detects that a failure has occurred in either the /in system or the check system, and outputs and displays an error signal. and performs warning monitoring for failures.

Similarly, the return input information of the (N + 1)-order group of the higher-order group input to the third interface unit 20 is converted from a bipolar signal to a unipolar signal and sent to the main system separation unit 21.
is input to the check system separation unit 22. Then, in the main system separation unit 21, the multiplexed channel information input from the third interface unit 20 is separated in the first separation unit 211, and the information for one channel is stored in the first reception side memory 21.
2, store it, convert the speed, and output it as main system information. Similarly, in the check system separation unit 22, the multiplexed channel information from the third interface unit 20 is separated in the second separation unit 221, and one channel information is inputted to the second reception side memory 222 and stored, and the speed is increased. Convert and output as check information. The output from the first receiving side memory 212 is output via the fourth interface unit 24 as channel information of a low-order group of an N-order group lower than the first-order group. At this time, the output of the main system separation section 21 and the output of the check system separation section 22 are both output from the first comparison section 2.
3, the main system is the check system, and the second comparison unit 23 compares and detects a failure in either system.
It outputs and displays error signals to monitor failures.

In the conventional alarm monitoring method described above, even when a failure occurs in the transmission line and information is no longer transmitted, the error signal is simply detected and displayed, and the failure is repaired only after the failure is indicated. The method is to restore the system by performing the following steps.

[Problem to be solved by the invention]

Therefore, in the conventional fault alarm monitoring method, it takes time to recover from the occurrence of a fault, and data transmission is stopped during that time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a circuit system that controls switching to a normal system immediately after a failure occurs and reduces data transmission interruption time.

[Means to solve the problem]

FIG. 1 is a diagram showing the basic configuration of the present invention.

In the figure, 11 main system multiplexing units and 12 check system multiplexing units constitute a transmission path from a low-order group to a high-order group.
The multiplexing sections 11 and 12 form an outbound dual path, and the first comparison section 13 detects failures in both the multiplexing sections 11 and 12. Conversely, the main system separation section 21 and the main system separation section 22 The check system separation section constitutes a transmission path from the high-order group to the low-order group, and both the separation sections 11 and 12 form a double return path, and the second comparison section 23 connects both separation sections 21 and 22. It detects the failure of l.
2 is a pattern generation means that generates pattern information for searching for faults in the respective transmission paths of the low-order group and the high-order group; 2 is a phase correction means that generates pattern information from the pattern generation section 1; 3 is a comparison/judgment means that performs a comparison and judgment between the delayed output from the phase correction means 2 and the output from the check system multiplexing section 12; and 4: selection control means, and the first comparison section 13. Second comparison section 23. A means for inputting the respective outputs from the comparison/judgment means 3 and outputting a selection control signal; 5 is a first selection means connected to the low-order group input side, and 6 is a second selection means connected to the high-order group output side. Means 7 is a third selection means connected to the higher-order group input side, 8
is a fourth selection means connected to the low-order group output side.

The first selection means 5 to the fourth selection means 8 input the selection control signal from the selection control means 4 and switch between the two signals to be applied to the own circuit, thereby selecting between the main system and the check system. The system is configured to determine which system is at fault and automatically switch to a normal system.

[For production]

In the present invention, as shown in FIG.
The phase-corrected output which is output by the phase correction means 2 is added to the comparison and judgment means 3 together with the output from the check system multiplexing section 12 for comparison and judgment, and furthermore, the comparison and judgment means 3 compares and selects the output. A selection control signal is outputted by inputting it to the selection control borrowing means 4 together with the outputs of the first comparison section 13 and the second comparison section 23.

Therefore, using the selection control signal, the first selection means 5. Second selection means6. Third selection means7. Two signals input to each of the fourth selection means 8 are selected and switched, and when an alarm in the device is issued, it is determined whether there is a failure in the main system or the check system, and automatic switching to the normal system is performed. Yes.

〔Example〕

FIG. 2 is a diagram showing the configuration of an embodiment of the present invention. In the figure, 1 to 8 are circuits of the invention, ■ is a pattern generation section as a pattern generation means, 2 is a phase correction section as a phase correction means, 3 is a comparison judgment circuit as a comparison judgment means, and 4 is selection control. This is a selector control section as a means. 5 again
8 is each selector which is a selection means, 5 is a first selector, 6 is a second selector, 7 is a third selector, 8
is the fourth selector. Furthermore, 10-14 and 20-2
4 is as explained in the conventional example.

Furthermore, FIG. 3 (Part 2) is a flowchart showing fault isolation between the main system multiplexer II and the check system multiplexer 12, and FIG. It is a figure which shows the flowchart of fault isolation. The operation will be explained below using FIG. 2, FIG. 3 (Part 1), and FIG. 3 (Part 2).

When the system with the circuit configuration shown in FIG. 2 is operating normally, the low-order group information passing through the first interface section 10 is
Terminal a of the first selector 5 is normally on, second selector 6
Since the terminal a of the main system multiplexing section 11 is also normally on,
and passes through the second selector 6 and the second interface section 14,
Only the first order group of the input low order group information is output as higher order group information.

On the other hand, since the terminal a of the third selector 7 is normally on and the terminal a of the fourth selector 8 is normally on, the high-order group information input to the second interface section 20 is transmitted to the main system separation section 21 and the fourth Selector 8, fourth interface section 2
4, the lower-order group information is lower than the higher-order group information by the first-order group,
Output as @.

Assume that an error occurs in the first comparator 13 and an error signal is output. This indicates that either the main system multiplexer 11 or the check system multiplexer 12 has a failure. A flowchart for fault isolation in this case is as shown in FIG. 2 (Part 1). Error detected by first comparison unit 13? is present (Y[!S), the output of the first comparison section 13 is input to the selector control section 4 to output a selection control signal, and the first selector 5,
is applied to each of the third selectors 7 to switch terminal a of these two selectors off and terminal a on. Therefore, the pattern information from the pattern generating section 1 for fault monitoring is sent to the terminal of the third selector 7.

Check system separation section 22. The terminal of the first selector passes through the check system multiplexing section 12 to a comparison/judgment circuit 3, where it is compared with the pattern information from the pattern generation section 1 that has passed through the phase correction section 2.

Error which is the comparison result of this comparison judgment circuit 3? If there is no
is normal and the main system multiplexer 11 is abnormal), the terminal a of the second selector 6 is switched off and the terminal a is switched on, and the output from the first interface section IO is sent to the first selector 5. Check system multiplexing section 12. Second selector 6
The signal is output to the second interface unit 14 through the . Further, when the output of the first comparison section 13 indicates that there is an error (YES), the output from the first interface section 10 is outputted to the second interface section 4 through the main system multiplex section 11 and the second selector 6. Ru.

Next, assume that an error occurs in the second comparing section 23 and an error signal is output. The flowchart for fault isolation in this case is as shown in FIG. 3 (Part 2), and the operation is substantially the same as that in FIG. 3 (Part 1) described above. At this time, is there an error in the second comparison section 23? If yes (YES), the output of the second comparator 23 is input to the selector control unit 4, which outputs a selection control signal, and turns off each terminal a of the first selector 5 and third selector 7. , and also toggles each terminal on. Therefore, the information from the pattern generation section 1 passes through the terminal b1 of the third selector 7, the check system separation section 22, the terminal 2 of the first selector 5, and the check system multiplex section 12 to reach the comparison/judgment circuit 3.

Note that in the comparison/judgment circuit 3, pattern information from the pattern generation section l that has passed through the phase correction section 2 is added and compared. When there is no error output (NO) as the comparison result of the comparison/judgment circuit 3, that is, in this case, the check system separation unit 2
2 is normal (main system separate type part 21 is abnormal)
This indicates that the terminal a of the fourth selector 8 is turned off,
Also turn on the terminal. Therefore, the input from the third interface section 20 is outputted to the fourth interface section 24 through the third selector 7, the check system separation section 22, and the fourth selector 8. Further, when there is an output from the first comparison section 13 (YES), it indicates an abnormality in the check system separation section 22, and the input from the first interface section 20 is transmitted to the third selector 7, the main system separation section 21, and the main system separation section 21. 4 selector 8 and is output to the fourth interface section 14.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, when an internal alarm II (error signal) occurs in a digital multiplexing/demultiplexing device, it is possible to immediately switch automatically, and in the event of a failure. It has a great effect of reducing data outage time, and can greatly contribute to increasing system efficiency.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle configuration of the present invention, FIG. 2 is a diagram showing the configuration of an embodiment of the present invention, and FIG. FIG. 3 (Part 2) is a flowchart showing a fault isolation process for the main system isolation section 11 and the check system isolation section 12. FIG. 4 shows the circuit configuration of a conventional embodiment. FIG. 21 is the main system separation section, 22 is the check system separation section, 23
indicates the second comparison part. In the figure, 1 is a pattern generation means (pattern generation section), 2 is a phase correction means (phase correction section), 3 is a comparison judgment means (comparison judgment section), 4 is a selection control means (i!! stream control section), 5 is a first selection means (first selector), 6 is a second selection means (second selector), 7 is a third selection means (third selector), 8 is a fourth selection means (fourth selector), 11 is Main system multiplex section, 12 is check system multiplex section, 13
is the first comparison part, Figure α 1) Me70-child yard is zero Tr! lj Figure 3 (3/+2)

Claims (1)

[Claims] Low-order group information is transmitted as high-order group information via a main system multiplexer (11), and via a double path between a main system multiplexer (11) and a check system multiplexer (12). The first comparing section (13) compares both pieces of transmitted information to detect which path is at fault, and further transmits the higher-order group information as higher-order group information via the main system separation section (21). The second comparison unit (23) compares both pieces of information transmitted via the dual path between the system separation unit (21) and the check system separation unit (22) to detect a fault in either path, and the transmission A pattern generating means (1) for generating pattern information for searching for faults in dual paths of each of the low-order group and the high-order group; Phase correction means (2) that performs phase correction to delay the pattern information from the pattern generation means (1) by a certain period of time.
and a comparison/determination means for comparing and determining the output from the phase correction means (2) and the output from the check system multiplexing section (12).
3), a selection control means (4) which inputs the outputs from the first comparison section (13), the second comparison section (23) and the comparison determination means (3), respectively, and outputs a selection control signal; In order to input the selection control 1 signal from the selection control means (4) and selectively switch between the main system and the check system on the transmitting side or the receiving side, the first selecting means (4) is connected to the low-order group input side. 5) and a second selection means (6) connected to the higher order group output side.
), a third selection means (7) connected to the high-order group input side, and a fourth selection means (8) connected to the low-order group output side. An automatic recovery method when an alarm occurs in the multiplexing/demultiplexing equipment, which is characterized by determining whether the system is present and automatically switching to a normal system.