JP2746144B2 - Selective monitoring system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a selection system monitoring system for monitoring a selection circuit, and more particularly to a selection system monitoring system capable of identifying and detecting a fault occurring in any of a plurality of selection circuits.

[0002]

2. Description of the Related Art For example, a communication apparatus for handling large-capacity digital signals, such as a backbone transmission, comprises a number of function packages. Outputting to the device. Some of the function packages need to perform signal processing while matching with other function packages. Therefore, processing may be performed at the same timing using the same clock signal. At that time, if a failure occurs in the clock signal, the failure will affect the entire device,
Smooth signal processing cannot be performed. Therefore, there are cases where two systems of generators for generating clock signals are prepared, and a redundant configuration is provided such that when a failure occurs in one of them, the other is selected.

In such a redundant configuration, for example, a selection circuit is provided for selecting a clock signal for each functional package. In this case, the clock signals output from the same system must be simultaneously selected by the selection circuit of each function package. Therefore, there is a case where a selection signal for determining which system signal is selected is generated at one place, and the selection circuit selects a clock signal based on this.

When selecting such a signal, it may be necessary to monitor whether a normal selection is being made. Japanese Patent Application Laid-Open No. 3-210844 discloses a technique in which different monitoring pattern data is inserted into each of input signals, and the monitoring pattern is monitored after passing through a selection circuit to determine whether a normal selection is made. Is disclosed. However, this technique cannot be applied to signals without empty time slots to be inserted, such as clock signals. Therefore, when a clock signal is included in the signal to be selected, the selection signal input to each selection circuit may be detected, and monitoring may be performed depending on whether the signal matches the original selection signal.

FIG. 3 shows the configuration of a conventional selective monitoring system. The selection system monitoring system comprises a selection system generation section 51 for outputting a selection signal, and N selector 52 ₁ to 52 _N to select a signal input is provided for each function package (not shown) , Selection system generator 51
And a control unit 53 for controlling each function package.

The selection system generation unit 51 includes a selection signal generation unit 54 for generating a selection signal, a comparison unit 55, and a control signal processing unit 5.
6 is provided. The selection signal generating section 54 outputs a selection signal 57
Is generated and distributed to the selection units 52 _{1 to} 52 _N. The comparing section 55 compares whether or not the selection signal input to each selection section and returned is identical to that of the generation source. The control signal processing unit 56 takes in a control signal 58 transmitted from the control unit 53, performs necessary processing, and outputs a response result to the control unit 53. The response result includes the failure information obtained from the comparison result 59 from the comparison unit 56 at the timing when the control signal 58 is input.

Each of the selection units 52 _{1 to} 52 _N receives the input signal 2 according to the selection signal 57 output from the selection system generation unit 51.
Selectors 62 _{1 to} 62 _N for selecting one of the system signals 60 and 61 are provided, respectively. The output 63 of the selector is supplied to the above-mentioned function package arranged at the subsequent stage. Further, the selection signal 57 input to each selector is branched immediately before that, and
It is output from the ₁ to 64 _N and the inverter 65 _1-65 each selection unit 52 via the _{N 1} to 52 _N. These are commonly input to the comparison unit 55 of the selection system generation unit 51. In the comparison unit 55, the output signal 66 of each of the buffers 64 ₁ to 64 _N or the output 67 of the inverters 65 _{1 to} 65 _N
Is compared with the selection signal 57 directly output from the selection signal generation unit.

The control section 53 includes a control signal transmitting section 68 and a control signal receiving section 69. These are not shown CP
U (central processing unit). The control signal transmitting unit 68 transmits a control signal for controlling the selection system generating unit 51 and the function package. The control signal receiving unit 69 mainly receives the failure information as a result of each unit responding to the control signal transmitted to each unit. The control unit 53 has a memory for storing the fault information, and stores the received fault information therein. CPU
Reads out this information as needed and performs various controls.

In the selective monitoring system having such a configuration,
Corresponds to “0” or “1” from the selection signal generator 54
One of the predetermined level selection signal 57 is output
Is done. Each selection unit 52₁~ 52_NThen, this selection signal 5
7, the selector 62₁~ 62_NWorks switching
To select one of the input signals 60 and 61 all at once.
Select. Also, the selection signal input to each selector is
Fa 64₁~ 64_NAnd inverter 65₁~ 65_NTo
Output to the comparison unit 56 of the selection system generation unit 51
The selection output directly from the selection signal generator 54
Compared to signal 57. With a buffer and an inverter
The reason why the selection signal is detected is, for example,
Buffer failure, the buffer failure is immediately detected, and the signal selection failure
It is because it is mistaken. Of the comparison in the comparing unit 55
As a result, if a mismatch occurs, the selection unit 52₁~ 52_Nof
One of the input signals is not selected properly
Become. The failure information 70 is transmitted to the control signal transmitting section 68 of the control section.
Control signal in accordance with the timing of the control signal output from the
Is transmitted to the signal receiving unit 69. Thereby, the selection unit 52
₁~ 52_NThe control unit 53 recognizes a fault that has occurred in any of
You can understand.

[0010]

[0011]

However, in such a selection system monitoring system, the selection signal collected from the selection unit and the selection signal output from the selection system generation unit at this time are different in the comparison unit. Perform comparisons at different times
Control signal timing in the control
And the timing circuits for setting separately must be prepared by the number of selection units. Therefore, there is a problem that the circuit scale and the processing amount of the control unit are increased.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a selection system monitoring system which detects a mismatch between selection signals in each selection unit and reduces the circuit scale.

[0013]

According to the first aspect of the present invention, there is provided: (a) a selector for commonly inputting a plurality of types of signals output from a plurality of signal generating units and selecting one of them; Signal for controlling the selection of this selector.
A gate connected to one end of the force terminal, which receives a control signal and a destination determination means for determining whether or not the self-destined predetermined timing gate when the destination determining means has determined the self destined The gate control means to make it conductive with the fault information indicating whether a fault has occurred
A plurality of selectors having fault information holding means for holding the information when transmitted , and (b) commonly connected to one end of a gate of these selectors via a first transmission line, and A selector for generating a selection signal for selecting one of a plurality of types of signals in common and simultaneously; a selection signal generator via the other end of each of the gates of these selectors and a second transmission path; commonly connected Te, a comparison unit second transmission line signal appearing in the selection signal generating unit compares the signal generated at this time, the comparison result of the comparing unit is one
If not, it is assumed that the corresponding selection unit has failed.
While supply and selection systems generating unit and a <br/> transmitting means for transmitting the failure information in the failure information holding means of the selection unit, a control signal to a plurality of selected portions (c) Te, the selection of these Part of
A control unit for receiving fault information on the presence or absence of each fault from the fault information holding means in the selective monitoring system.
Let it.

That is, according to the first aspect of the present invention, the selection signal is transmitted to the fault monitoring means provided in the selection unit by the gate of the selection unit which conducts for each destination of the control signal supplied from the control unit. Fault information is collected as a result of comparison between the comparison units generated in the first and second transmission paths. As a result, it is possible to detect the mismatch of the selection signal in each selection unit, and it is possible to reduce the circuit size of the control unit.

According to a second aspect of the present invention, the plurality of signal generators are different clock signal generators. In the invention according to claim 3, the control unit is connected to the plurality of selection units via a common transmission line, and incorporates destination information for specifying each selection unit and control data for controlling the selection unit. The control frame signal is transmitted from the control unit to a common transmission path. Further, in the invention according to claim 4, the control unit is connected to the plurality of selection units via a common transmission path, and the control unit transmits a control signal for controlling the gate of each selection unit at a predetermined time interval after a predetermined reference signal. The gate control means of each selector receives the reference signal and decodes the received control signal after a lapse of a time allocated to the reference signal to control the gate. Further, in the invention according to claim 5, the failure monitoring means detects a failure of the entire selection section of itself, incorporates the result into the packet signal together with the identification information of the selection section of itself, and outputs a signal between the control section and each selection section. It is characterized in that it is transmitted to a common transmission line provided. These show specific forms.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments.

FIG. 1 shows an outline of the configuration of a selective monitoring system according to an embodiment of the present invention. The system includes a selection system generator 11 that outputs a selection signal,
First to Nth selectors 12 _{1 to} 12 _N for selecting one of the two input signals and outputting the selected signal to each function package (not shown)
And a control unit 13 for controlling each selection unit and function package via a control signal.

The selection system generation unit 11 includes a selection signal generation unit 14
And a comparison unit 15. The selection signal generator 14 generates a selection signal 16 for instructing selection of an input signal. The selection signal 16 is distributed to each of the _first to _Nth selection units 121 to 12N and one input terminal of the comparison unit 15. The comparison unit 15 is for comparing whether the selection signal 17 returned to the selection units and returned to the selection unit 16 matches the selection signal 16 directly input from the selection signal generation unit 14.

The first to N-th selectors 12₁~ 12_NIs
Each has the same configuration. Each selection unit 12₁~ 12
_NSelects one of the two input signals 18 and 19
Selector 20 for selecting₁~ 20_Nhave. So
Is selected by the selector 20₁~ 20 _NEach control end of
This is performed based on the selection signal 16 input from the child. each
Selector 20₁~ 20_NThe output 21 of
Supplied to the aforementioned function package for performing seed signal processing
You. The selection signal 16 distributed to each selection unit is
G22₁~ 22_NIs also supplied to the input terminal. Game
G22₁~ 22_NIs the control input from the control terminal
Signal processing unit 23₁~ 23_NOutput signal 24₁~ 24_NBut
Outputs the input control signal when it reaches the specified level.
Output to the force side. Gate 22₁~ 22_NOut of
The input terminals are interconnected with those of the other
Connected to another input terminal of the comparison unit 15 of the generation unit 11
You. Thus, the comparison unit 15 performs the comparison process. ratio
The output terminal of the comparator 15 is connected to the control signal processor 23 of each selector.
₁~ 23_NIt is connected to the. Control signal processing unit 23₁~
23_NIs the control of the frame configuration transmitted from the control unit 13.
A frame counter for receiving the signal 26 is provided.
Control signal to control the selection section.
Is Umono. Also, the result of the control processing and the selection
The control unit 13 uses the generated fault information as a response result of the control signal.
Output to

The control section 13 includes a control signal transmitting section 27 and a control signal receiving section 28. These are not shown CP
U (central processing unit). Control signal transmission unit 27 and the control signal receiving unit 28 is connected to the control signal processing unit 23 ₁ ~ 23 _N for each selected portion. The control signal transmitting section 27 outputs a control signal having a frame configuration. The control signal receiving unit 28 is a control signal processing unit 2 of each selection unit.
3 is intended to receive a ₁ ~ 23 _N treated with response result 29. The received response result 29 is stored in a memory (not shown) as failure information for each selection unit. The CPU reads the information as necessary and performs various types of fault processing such as turning on a lamp (not shown) provided in each selector to clearly indicate the occurrence of the fault.

FIG. 2 shows a data format of a control signal transmitted and received by the control unit and each selection unit. The control signal is composed of a frame 64-bit, the 8 bits of the first is added an identifier 41 for identifying one of the selection unit 12 ₁ to 12 _N, the control data 42 is written in the remaining 56 bits Configuration. These are connected to each other in N sets, and the control signal transmission unit 27 of the control unit transmits the signals to
It is sent to the ₁ to 12 _N.

[0022] Now, by the above-described instruction of the CPU of the control unit 13, the control frame signal 26 is assumed to have been transmitted to the control signal processing unit 23 ₁ ~ 23 _N for each selected portion from the control signal transmitting unit 27. The control signal processing unit 23 ₁ ~ 23 _N, takes control signal and synchronization of a frame structure, waiting to control data that the self-destined arrives. Here, for example, when the control signal of the self to the first selection unit 12 ₁ as a destination arrives, the control signal processing unit 23 ₁ is turned on gate 22 ₁ at the time of recognizing it.

On the other hand, each selection unit 12 ₁ to 12 _N, the selection signal 16 is inputted from the selection signal generating section 14 of the selection systems generating unit 11. By this selection signal, the selector 20 ₁
Select one of the input signals 18 and 19. Therefore, when the gate 22 ₁ is turned on, a selection signal is input to the selector 20 ₁ is output to the comparator unit 15 of the selection system generator.

The output of the selection signal and the gate 22 ₁ from the comparator unit 15 the selecting signal generating section 14 are compared, the result is outputted to the control signal processing unit 23 ₁ ~ 23 _N for each selected portion. In this case, it is possible to only control the signal processing unit 23 ₁ is receiving a control signal addressed to itself processes the comparison result. If the comparison result is a mismatch, the selector 2
0 ₁ means that the signal is not normally selected. Control signal processor 23 ₁ is turned off period corresponding to the frame length is elapsed after the gate 23 ₁ of the control signal addressed to it, it holds the comparison result input from the comparator 15 as fault information. Made in the above processing each frame each separate each selector 12 ₁ to 12 _N of the control signal, the control signal processing unit 23 ₁ ~ 23 _N of each selection unit, information about the failure of the selected portion is held The Rukoto. The control signal processing unit 23 ₁ ~ 23 _N after a predetermined frame period elapses, similar to the results of the other control processes of the control signals for transmission in synchronization with the control signal that is input to the control signal receiving unit 28 And writes the failure information to the control unit.

[0025] The control unit 13 stores in the memory while associated with division multiplexed control signal identification data when output from each of the control signal processing unit 23 ₁ ~ 23 _N for each selected portion. The CPU reads information from the memory as necessary and monitors the occurrence of a failure. When the occurrence of a failure is found, a control signal is output again to the selection unit having the corresponding identification data, thereby performing the above-described failure processing such as turning on a lamp for clearly indicating the occurrence of the failure. Thus, it is possible to identify a failure of selection signals generated by any of the selected portions 12 ₁ to 12 _N.

As described above, in the selection-based monitoring system of this embodiment, when the control signal transmitted in a time-division manner for each selection unit is directed to itself, the input selection signal is replaced with the original selection signal. Since the matching is compared, the occurrence of a failure can be monitored for each selection unit. Moreover,
Conventionally, the control signal processing unit, which only controls the selection unit by the control signal from the control unit, is provided with a simple configuration having a function of detecting whether the distributed selection signal is normal or not. Since the configuration is not changed, the circuit scale does not increase. In addition, since only a new area representing fault information is added to the conventionally used frame configuration control signal, the processing amount of the control unit does not increase.

In the above-described embodiment, the control signal output from the control unit is output by connecting control frame signals destined for each selection unit, and each control signal processing unit synchronizes with the control frame signal and outputs a fixed frame cycle. The processing result is output later. However, the failure information of each selection unit may be collected while sequentially completing the transmission and response processes for each selection unit.

In this embodiment, the monitoring of the two selection circuits has been described. However, it is needless to say that the present invention can be applied to a monitoring system of a selection circuit for selecting two or more signals. The signal is not limited to a signal, and may be a data signal.

[0029]

As described above, according to the first to fifth aspects of the present invention, the gate of the selection unit is turned on for each destination of the control signal supplied from the control unit. The fault monitoring means collects fault information as a result of comparison between the comparison units generated in the first and second transmission paths for transmitting the selection signal. Therefore, it is possible to detect the mismatch of the selection signal for each selection unit. Further, since the processing amount of the control unit does not increase, the circuit scale can be reduced.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram showing a data format of a control signal transmitted and received by a control unit and each selection unit.

FIG. 3 is a block diagram showing a configuration of a conventional selective monitoring system.

[Explanation of symbols]

11 Selection systems generating unit 12 ₁ to 12 _N selector 13 control unit 14 a selection signal generation unit 15 comparison unit 20 ₁ to 20 _N selectors 22 ₁ through 22 _N gate 23 ₁ ~ 23 _N control signal processing unit 27 the control signal transmission unit 28 Control signal receiver

Claims (1)

(57) [Claims] 1. A selector for commonly inputting a plurality of types of signals output from a plurality of signal generators and selecting one of them, and a signal for performing selection control of the selector.
A gate having one end connected to the signal input terminal, a destination determining means for receiving a control signal and determining whether or not the destination is addressed to itself, and the gate is determined when the destination determining means determines that the destination is itself. disabilities shows the gate control means for conducting the timing, whether self fails
Failure information storage that retains harm information when it is transmitted
A plurality of selecting units having a holding unit, and one end of the gates of these selecting units are connected in common via a first transmission line, and these selectors are configured to output any one of the plurality of types of signals. A selection signal generation unit for supplying a selection signal for common and simultaneous selection, and a second transmission line connected in common to the other ends of the gates of these selection units via respective second transmission lines; a comparison unit signal and the selection signal generating unit compares the signal generated at this time appeared to, select the corresponding when the comparison result of the comparing unit does not match
The failure of the selection unit as a failure of the selection unit
A selection based generator and a transmission means for transmitting the failure information in the information holding means, while supplying the control signal to the plurality of selector, respectively from the failure information holding means of these selection unit
A control unit for receiving fault information regarding the presence or absence of a fault
A selective monitoring system characterized by: