JP2000209243A - Monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To report a fault occurrence part and to quickly deal with repair exchange or the like by providing a fault processing means which can be operated independently, when detecting fault occurrence in each terminal equipment and transmitting fault information corresponding to a network from the terminal which detects the fault occurrence. SOLUTION: A fault processing block 10 is provided with an incorporated preliminary clock source, which is independent of a reception clock from a video multiplex processing block 7 and a waveform change detecting function operated by the clock monitors the state of a reception clock. When a fault occurs between a part from the processing block 2 to 7 and the input clock of the block 10 is stopped, the fault processing block 10 detects it, exchanges a transmission clock to a transmission processing block 6 into the preliminary clock and transmits error information to the block 6 in place of data. Fault information is transmitted to the network 1 as output data of terminal equipment T, and the equipment T and a server device S can recognize the location and conditions of the fault occurrence.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance system, and is used for detecting a location where a failure has occurred in a component of the system.

[0002]

2. Description of the Related Art A conventional monitoring system includes a terminal device having a function of transmitting monitored data such as video, audio, and information to a network, and a server that receives the data from the network and performs information processing, determination, and display. Although it is configured by connecting a plurality of devices, it usually has a failure detection function because high reliability is required. Hereinafter, an example of an operation of a device used in the monitoring system and a failure detection thereof will be described with reference to FIG. In each terminal device T ′, the input data received from the network 1 is separated into data required by the reception processing block 2 and a clock for processing timing, and transmitted to the video separation processing block 3. The video separation processing block 3 starts operation by the input clock, separates the video data from the input data, obtains a monitoring video output from another terminal device T ′, and outputs the next audio separation processing block 4. Then, the input data and clock are transmitted. Hereinafter, similarly, the voice separation processing block 4,
In the information separation processing block 5, audio data and information data are separated from each other, a monitoring voice output and a monitoring information output from another terminal device T 'are obtained, and the next information multiplex processing block 9 is obtained.
Then, the input data and clock are transmitted.

The information multiplexing processing block 9 takes in the monitoring information data obtained in the terminal device T ', multiplexes it with the input data, and transmits the multiplexed data and the clock to the next audio multiplexing processing block 8. . Thereafter, similarly, in the audio multiplex processing block 8 and the video multiplex processing block 7, the monitoring audio data and the monitoring video data obtained respectively are taken in, multiplexed with the input data, and the final transmission processing block 6 The multiplexed data and clock are transmitted. Finally, in a transmission processing block 6, the data is converted into a data format suitable for the network 1, and the output data is transmitted. By the operation so far, the processing block 2
In step 6, when data from the preceding processing block is received, the data is checked for abnormalities. If an abnormality occurs, the information is added to the data and transmitted to the next block, and finally transmitted. From processing block 6 to network 1
Therefore, the terminal device in which the abnormality has occurred and the abnormal location in the terminal device can be detected by the other terminal devices T ′ and the server device S connected to the network 1.

[0004]

As described above, in the conventional example, occurrence of a data error can be detected.
If the clock transmitted between the processing blocks along with the data stops, the operation from there to the transmission processing block stops, and information is not transmitted outside the terminal device. From the outside, it becomes impossible to specify the location where the abnormality has occurred. In such a monitoring system, since the number of terminal devices is large and each terminal device and server device are often far apart, when a failure occurs, which terminal device has failed or which terminal device has failed. If it is not possible to determine whether a failure has occurred in the transmission path between the server and the server device, a great deal of time and effort is required until the recovery. The present invention eliminates these drawbacks, and in a monitoring system in which a large number of terminal devices are installed in a wide range, it is possible to quickly identify the location where an error has occurred in the event of a failure, thereby improving the system operation rate and maintainability. The purpose is to aim.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a monitoring system comprising a plurality of terminal devices and a server device connected in a loop to a network. Failure processing means that can operate independently when the occurrence is detected is provided, and the failure information corresponding to the network is transmitted from the terminal device that has detected the occurrence of the failure, thereby specifying the location of the abnormality occurrence by the server device. This is a possible monitoring system. As a result, even when the transmission clock in the terminal device is stopped, the failure information can be transmitted from the terminal device, so that it is possible to specify the location where the abnormality has occurred via the network.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a monitoring system according to the present invention will be described below with reference to the block diagram of FIG.
Note that the same reference numerals as in the prior art shown in FIG. In FIG. 1, a failure processing block 10 described below is installed between the transmission processing block 6 and the video multiplex processing block 7 of each terminal device T. The fault processing block 10 has a built-in spare clock source separately from the reception clock from the video multiplex processing block 7, and the waveform change detection function operated by this clock constantly monitors the state of the reception clock. ing. In normal times, input data received from the network 1 is separated into data and a processing timing clock in a reception processing block 2, and a video separation processing block 3, an audio separation processing block 4, an information separation processing block 5, an information multiplex processing block 9. After being processed by the audio multiplex processing block 8 and the video multiplex processing block 7, the data is transmitted to the network 1 as output data from the transmission processing block 6 via the failure processing block 10. Here, when a failure occurs between the processing blocks 2 to 7 and the input clock of the failure processing block 10 stops, the failure processing block 10 detects this as a failure and reserves the transmission clock to the transmission processing block 6. After switching to the clock, error information (failure information) instead of normal data
To the transmission processing block 6. This failure information is transmitted to the network 1 as output data of the terminal device T. Thus, the other terminal devices T and server devices S connected to the network 1 can receive the failure information and know the location and status of the failure.

FIG. 2 shows an example of a specific configuration of the fault processing block 10, which will be described below with reference to FIG. The incoming clock is synchronized with the backup clock by the synchronization unit 14, the frequency is further reduced by the frequency divider 15 until sampling can be performed with the backup clock, and the waveform change detection unit 16 detects the level change of this clock waveform. Keep doing. For example, the input clock is set to 1/3 of the spare clock.
When the frequency is divided up to the above, the waveform change detection unit 16 detects the level of the input clock at the timing of the backup clock. The same level cannot be detected. That is, the input clock is 1 /
When the frequency is divided up to n, if the input clock is at the same level for at least n + 1 clocks in the spare clock cycle, it can be determined that the clock has stopped, otherwise it is operating. Therefore, in normal times, the error signal is not output from the waveform change detection unit 16 and the data selector 12 selects the input data and the clock selector 13 selects the input clock. It is sent to the transmission processing block 6 as an output clock. If a failure occurs and the input clock stops, the waveform change detection unit 16 outputs an error signal. Therefore, the data selector 12 uses the failure information from the failure information generation unit 11 as output data, and the clock selector 13 uses The clock is output to the transmission processing block 6 as an output clock.
As a result, the transmission processing block 6 can transmit this fault information to the network 1 without stopping the operation.

Here, FIGS. 3 and 4 show examples of the supply form of the spare clock, and these operations will be described below with reference to FIGS. 3 and 4. FIG. FIG. 3 shows an example in which an independent oscillator 18 supplies a backup clock to the failure processing block 10. In the case of this method, since the frequency of the input clock and the spare clock may not be a perfect integer multiple, P
Synchronization by LL or the like is necessary, but since the oscillation source is independent, even if input data stops or a failure occurs in the reception processing block 2, a failure can be detected. FIG.
This is an example in which an output clock of the reception processing block 2 is used as a supply source of a backup clock. In this case, due to the stop of the input data or the failure of the reception processing block 2,
There is a possibility of stopping up to the backup clock, but it is possible to detect a failure between the reception processing block 2 and the failure processing block 10 which has the longest path, and it is not necessary to add another oscillator, and the same oscillation source Since the processing is performed between clocks, there is no need for synchronization by a PLL. Next, a description will be given of a second embodiment capable of specifying a location where a failure has occurred in a terminal device. This is a configuration in which the fault processing block 10 is inserted between all the processing blocks between the processing blocks 2 to 6 in the configuration of FIG. If the same operation as above is performed in this configuration, when the clock is stopped, the nearest fault processing block will operate, but it is necessary to carry its own position information on the fault information generated in each fault processing block. Thus, it is possible to specify a block in which a failure has occurred in the terminal device. When the failure processing block between the processing blocks 2 and 3 detects an abnormality, it can be determined that the reception processing block 2 or the transmission path before it is abnormal.

Next, a third embodiment capable of specifying a fault location in a network will be described with reference to FIG. FIG. 6 is a configuration example when a plurality of terminal devices exist in the network. In normal times, data output from the server device 19 returns via the terminal devices 20, 21 and 22 connected by a network. Here, as described in the first embodiment, when a failure occurs in the terminal device, the corresponding terminal device itself transmits corresponding failure information to the server device 1 via the network.
9, the terminal device in which the failure has occurred can be specified. Further, as described in the second embodiment, when a failure occurs on the transmission path between the terminal devices, the failure location
The terminal device (21 in FIG. 6) at the subsequent stage (in FIG. 6) detects the failure and transmits the failure information to the server device 19 via the network, so that the position of the transmission line where the failure has occurred can be specified. . When a failure occurs in the transmission path between the terminal device 22 and the server device 19, the server device 19
Since no data is received, it can be specified that a failure has occurred in the immediately preceding transmission path.

[0010]

As described above, according to the present invention,
Even if the synchronous clock stops due to the failure of each terminal device or transmission line, the location of the failure can be notified to the outside of the terminal device, and the repair or replacement of the failed portion can be promptly dealt with. Thus, the maintainability of the monitoring system is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a monitoring system according to the present invention.

FIG. 2 is a block diagram showing a functional configuration of a fault processing block according to the present invention.

FIG. 3 is a block diagram showing a schematic configuration of a fault processing by an independent backup clock according to the present invention;

FIG. 4 is a block diagram showing a schematic configuration of a fault processing by an internal transmission clock according to the present invention;

FIG. 5 is a block diagram showing a schematic configuration of a conventional monitoring system.

FIG. 6 is a network configuration diagram showing a configuration of a monitoring system according to the present invention.

Claims (4)

[Claims] In a monitoring system comprising a plurality of terminal devices and a server device connected in a loop to a network, a fault process which can operate independently when a fault is detected in each of the terminal devices. A monitoring system, characterized in that: a means for transmitting the fault information corresponding to the network from a terminal device which has detected the occurrence of the fault enables the server device to specify a fault occurrence location. 2. A monitoring system comprising a plurality of terminal devices transmitting predetermined monitoring information to a loop network and a server device receiving monitoring information from the plurality of terminal devices and performing predetermined information processing. Each of the terminal devices has a reception processing unit, a plurality of information processing units, a transmission processing unit, and a failure processing unit that can operate independently when the occurrence of a failure is detected. A monitoring system, characterized in that a fault location corresponding to the network can be specified by the server device by transmitting fault information corresponding to the network from the detected terminal device. 3. The terminal according to claim 1, wherein a failure processing unit is provided at least between the information processing unit and the transmission processing unit of each of the terminal devices, and a transmission path immediately before each of the terminal devices and a transmission line of each of the terminal devices are provided. A monitoring system characterized in that when a failure has occurred in the reception processing means or the information processing means, the failure detection processing is performed, and failure occurrence information corresponding to the network is transmitted from the next transmission processing means. 4. The fault processing means according to claim 1, further comprising: a fault detecting means, a spare clock generating means, and a switching means for switching between an operating clock and a spare clock. A surveillance system characterized by switching to: