JPH08125627A - Monitor system for selection system - Google Patents

Abstract

PURPOSE: To obtain the monitor system for selection system in which each selection section detects dissidence of selection signals with a small circuit scale while reducing amount of information processing. CONSTITUTION: A control signal processing section (231 -23N) provided to a selection section (121 -12N) controls a gate in response to a timing of a control signal sent from a control section 13 addressed to itself to provide an output of a received selection signal to a comparator section 15. The comparison results by the comparator section 15 are collected for each control signal processing section of each selection section as a fault information and then a fault of each selection section is detected. Since the processing amount by the control section is not increased, the circuit scale is reduced.

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 one of a plurality of selection circuits.

[0002]

2. Description of the Related Art For example, a communication device for handling a large-capacity digital signal such as backbone transmission is composed of many function packages, and each function package appropriately processes an input digital signal to execute the next function package or communication. Outputting to the device. Since some of these function packages need to perform signal processing while matching with other function packages, they may be processed at the same timing using the same clock signal. At that time, if a failure occurs in the clock signal, the failure will spread to the entire device,
It becomes impossible to perform smooth signal processing. Therefore, there are cases in which two systems of generators for generating a clock signal are prepared, and a redundant configuration is provided in which when one of the generators fails, 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, it is necessary to select the clock signals output from the same system all at once by the selection circuit of each functional 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 the clock signal based on this.

When selecting such a signal, it may be necessary to monitor whether or not a normal selection is made. Japanese Unexamined Patent Publication No. 3-210844 discloses a technique of inserting different monitoring pattern data into each of the input signals and monitoring the monitoring pattern after passing through a selection circuit to determine whether normal selection is performed. Is disclosed. However, this technique cannot be applied to signals without empty time slots to insert, such as clock signals. Therefore, when the signal to be selected includes a clock signal, the selection signal input to each selection circuit may be detected, and monitoring may be performed depending on whether the selection 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
Also, a control unit 53 for controlling each function package is provided.

The selection system generation section 51 includes a selection signal generation section 54 for generating a selection signal, a comparison section 55, and a control signal processing section 5.
6 is provided. The selection signal generator 54 outputs the selection signal 57.
The generated and distributed to each of the selection unit 52 ₁ to 52 _N. The comparison unit 55 compares whether or not the selection signal that is input to and returned to each selection unit matches that of the generation source. The control signal processing unit 56 takes in the control signal 58 transmitted from the control unit 53, performs necessary processing, and outputs the 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 in accordance with the selection signal 57 output from the selection system generation unit 51.
The selectors 62 _{1 to} 62 _N for selecting one of the system signals 60 and 61 are provided. The output 63 of the selector is supplied to each of the above-mentioned functional packages arranged in the subsequent stage. In addition, the selection signal 57 input to each selector is branched immediately before the selection signal 57 and the buffer 64
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 signals 66 of the buffers 64 ₁ to 64 _N or the outputs 67 of the inverters 65 _{1 to} 65 _N are output.
It is compared whether or not the inversion signal of 1 corresponds to the selection signal 57 directly output from the selection signal generator.

The control section 53 includes a control signal transmission section 68 and a control signal reception section 69. These are CP not shown
It is controlled by U (Central Processing Unit). The control signal transmitter 68 sends a control signal for controlling the selection system generator 51 and the functional package. The control signal receiving unit 69 mainly receives the failure information, which is the response result of each unit to the control signal sent to each unit. The control unit 53 is provided with a memory for storing failure information, and the received failure information is stored in it. CP
The U reads out individual information as necessary and performs various controls.

With the selective monitoring system having such a configuration
Corresponds to “0” or “1” from the selection signal generator 54
Select signal 57 of one of the predetermined levels is output
Is done. Each selection unit 52₁~ 52_NThen, this selection signal 5
Based on 7, the selector 62₁~ 62_NSwitching operation
Select either one of the input signals 60 and 61 simultaneously.
Choose. Also, the selection signal input to each selector is
FA 64₁~ 64_NAnd inverter 65₁~ 65_NTo
Is commonly output to the comparison unit 56 of the selection system generation unit 51 via
And the selection signal generator 54 outputs the selection directly there.
The signal 57 is compared. With a buffer and an inverter
The selection signal is detected by, for example, the buffer
If it is detected only by the fault, the buffer failure is immediate and the signal selection failure is
It will be mistaken for. Of the comparison in the comparison unit 55
As a result, if a mismatch occurs, the selection unit 52₁~ 52_Nof
Either one of the input signals is not properly selected and
Become. This failure information 70 is sent to the control signal transmitter 68 of the controller.
Control signal according to the timing of the control signal output from
It is transmitted to the signal reception unit 69. Thereby, the selection unit 52
₁~ 52_NThe controller 53 recognizes a failure that has occurred
Can be perceived.

In the conventional selection system monitoring system described above, which selection unit is used when the selection signals in the selection system generation unit 51 and the selection units 52 _{1 to} 52 _N do not match and a failure is detected. I can't recognize if the failure occurred in. Therefore, in order to recognize this, the control signal processing unit of each selection unit may detect the level of the selection signal and output the state of the control unit. In this case, the control signal processing unit of each selection unit outputs the state of the selection signal to the control signal reception unit at the timing of the control signal output from the control signal transmission unit of the control unit. The control unit collects these selection signals, and compares them with the separately collected selection signals of the selection system generation unit.

[0011]

However, in such a selection system monitoring system, in order to compare the selection signal collected from the selection unit with the selection signal output from the selection system generation unit at this time, It is necessary to prepare as many comparison units as there are selection units in the control unit. Therefore, there is a problem that the circuit scale and the processing amount of the control unit are increased.

Therefore, an object of the present invention is to provide a selection system monitoring system in which the circuit size is reduced while detecting the inconsistency of selection signals in each selection section.

[0013]

According to a first aspect of the present invention, (a) a selector for commonly inputting a plurality of types of signals output from a plurality of signal generators and selecting one of them. , A gate whose one end is connected to the input terminal of the selector, a destination discriminating means for receiving a control signal and discriminating whether or not this is the destination, and a gate when the destination discriminating means discriminates itself as the destination A plurality of selectors each having a gate control means for conducting at a timing of, and a failure monitor for monitoring a failure of a selector or the like, and (b) one end of the gates of these selectors and a common one via the first transmission path. Connected to each other, these selectors supply a selection signal for commonly and simultaneously selecting any one of a plurality of types of signals, and the other end of the gate of each of these selection units. 2's It is commonly connected through the sending passage,
Selection having a comparison unit for comparing the signal appearing on the second transmission line with the signal generated by the selection signal generation unit at this time, and a transmission unit for transmitting the comparison result to the failure monitoring unit of the plurality of selection units. The selected system monitoring system is provided with a system generation unit and (c) a control unit that supplies control signals to the plurality of selection units and receives failure information regarding a failure from the failure monitoring means of these selection units.

That is, according to the first aspect of the invention, the selection signal is transmitted to the fault monitoring means provided in the selection unit by the gate of the selection unit which is made conductive by the destination of the control signal supplied from the control unit. Fault information is collected as a comparison result of the comparing units generated in the first and second transmission paths. As a result, it is possible to detect inconsistency of selection signals in each selection unit and reduce the circuit scale of the control unit.

According to a second aspect of the present invention, the plurality of signal generators are different clock signal generators. Further, in the invention according to claim 3, the control unit is connected to the plurality of selection units through a common transmission line, and incorporates destination information for specifying each selection unit and control data for controlling the selection unit. It is characterized in that the control frame signal is transmitted from the control unit to a common transmission line. Further, in the invention according to claim 4, the control unit is connected to the plurality of selection units via a common transmission line, and the control unit transmits a control signal for controlling the gate of each selection unit at a predetermined time interval after the predetermined reference signal. The gate control means of each selection unit receives the reference signal and decodes the received control signal after the lapse of the time allotted to itself to control the gate. Further, in the invention according to claim 5, the fault monitoring means detects a fault in the entire selection unit of its own and incorporates the result in the packet signal together with the identification information of the selection unit of its own, and between the control unit and each selection unit. The feature is that the data is transmitted to a common transmission path provided. These represent concrete 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 system monitoring system according to an embodiment of the present invention. This system includes a selection system generator 11 that outputs a selection signal,
First to N-th selection units 12 _{1 to} 12 _N that select one of two input signals and output it 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 generator 11 includes a selection signal generator 14
And a comparison unit 15. The selection signal generation unit 14 generates a selection signal 16 instructing selection of an input signal. The selection signal 16 is distributed to each of the _first to _Nth selection units 12 _{1 to} 12 _N and one input terminal of the comparison unit 15. The comparison unit 15 is for comparing whether or not the selection signal 17 distributed and returned to each selection unit and the selection signal 16 directly input from the selection signal generation unit 14 match.

The first to Nth selecting sections 12₁~ 12_NIs that
Each has the same structure. Each selection unit 12₁~ 12
_NSelects either one of the two input signals 18 and 19.
Selector 20 for selecting₁~ 20_Nhave. So
Select 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 functional package described above for seed signal processing
You. The selection signal 16 distributed to each selection unit is
To 22₁~ 22_NIt is also supplied to the input terminal of. Game
To 22₁~ 22_NIs the control input from the control terminal
Signal processing unit 23₁~ 23_NOutput signal 24₁~ 24_NBut
When the specified level is reached, the input control signal is output.
It is output to the power side. Gate 22₁~ 22_NOut of
The input terminal is connected to that of the other selection section,
It is connected to the other input terminal of the comparison unit 15 of the generation unit 11.
You. As a result, the comparison unit 15 performs the comparison process. ratio
The output terminal of the comparison unit 15 is the control signal processing unit 23 of each selection unit.
₁~ 23_NIt is connected to the. Control signal processing unit 23₁~
23_NControls the frame structure transmitted from the control unit 13.
Equipped with a frame counter for receiving the signal 26
The control signal for itself to control the selection section.
Is Umono. In addition, the results of control processing and
The control unit 13 uses the generated fault information as the response result of the control signal.
Output to.

The control unit 13 includes a control signal transmitting unit 27 and a control signal receiving unit 28. These are CP not shown
It is controlled by U (Central Processing Unit). The control signal transmission unit 27 and the control signal reception unit 28 are connected to the control signal processing units 23 ₁ to 23 _N of the selection units, respectively. The control signal transmitter 27 outputs a control signal having a frame structure. The control signal receiving unit 28 is the control signal processing unit 2 of each selection unit.
The response result 29 processed by 3 ₁ to 23 _N is received. The received response result 29 is stored in a memory (not shown) as fault information for each selection unit. The CPU reads out the information as necessary and performs various kinds of failure processing such as turning on a lamp (not shown) provided in each selection unit in order to clearly indicate the occurrence of the failure.

FIG. 2 shows a data format of a control signal transmitted / received between the control unit and each selection unit. This control signal is composed of 64 bits for one frame, an identifier 41 for identifying any of the selection units 12 _{1 to} 12 _N is added to the _first 8 bits, and control data 42 is written to the remaining 56 bits. It has a different configuration. N sets of these are connected to each other from the control signal transmission unit 27 of the control unit to each selection unit 12.
It is sent to _{1 to} 12 _N.

Now, it is assumed that the control frame signal 26 is transmitted from the control signal transmission unit 27 to the control signal processing units 23 ₁ to 23 _N of each selection unit according to the instruction of the CPU of the control unit 13. The control signal processing units 23 ₁ to 23 _N are in synchronism with the control signals of the frame structure and wait for the arrival of control data destined for themselves. Here, for example, when a control signal arrives at the first selecting unit 12 ₁ with its own destination, the control signal processing unit 23 ₁ turns on the gate 22 ₁ at the time of recognizing the control signal.

On the other hand, the selection signal 16 from the selection signal generator 14 of the selection system generator 11 is input to each of the selectors 12 _{1 to} 12 _N. By this selection signal, the selector 20 ₁
Selects one of the input signals 18, 19. Therefore, when the gate 22 ₁ is turned on, the selection signal input to the selector 20 ₁ is output to the comparison unit 15 of the selection system generation unit.

The comparison unit 15 compares the selection signal from the selection signal generation unit 14 with the output of the gate 22 ₁ , and the result is output to the control signal processing units 23 ₁ to 23 _N of each selection unit. At this time, only the control signal processing unit 23 ₁ receiving the control signal addressed to itself can process the comparison result. If the comparison results do not match, the selector 2
0 ₁ means that the signal is not normally selected. The control signal processing unit 23 ₁ turns off the gate 23 ₁ after a lapse of the period corresponding to the frame length of the control signal addressed to itself, but holds the comparison result input from the comparison unit 15 as fault information. The above processing is performed in each selection unit 12 _{1 to} 12 _N separately for each frame of the control signal, and the control signal processing units 23 ₁ to 23 _N of each selection unit hold information regarding the failure of each selection unit. The Rukoto. Then, the control signal processing units 23 ₁ to 23 _N use the control signal for transmitting to the control signal receiving unit 28 in synchronization with the input control signal after the lapse of a predetermined frame period, similarly to the result of other control processing. The failure information is written in and sent to the control unit.

The control unit 13 stores the time-division-multiplexed control signal output from each of the control signal processing units 23 ₁ to 23 _N of each selection unit in the memory in association with the identification data. The CPU reads information from this memory as necessary and monitors the occurrence of a failure. When the occurrence of a failure is found, the control signal is output again to the selection unit having the corresponding identification data, so that the failure processing such as turning on the lamp for clearly indicating the occurrence of the failure is performed. In this way, it is possible to identify the failure of the selection signal that has occurred in any of the selection units 12 _{1 to} 12 _N.

As described above, in the selection system monitoring system of this embodiment, when the control signal transmitted in a time-division manner for each selection unit is for itself, the input selection signal is the original selection signal. Since they match each other, it is possible to monitor the occurrence of a failure for each selection unit. Moreover,
Conventionally, the control signal processing unit, which has only controlled the selection unit by the control signal from the control unit, has a function of detecting whether or not the distributed selection signal is normal, with a simple configuration. Since the configuration was not changed, the circuit scale does not increase. Moreover, since the area for expressing the fault information is newly added to the control signal of the frame structure used conventionally, the processing amount of the control unit does not increase.

In the embodiment described above, the control signal output from the control unit is output by concatenating the control frame signals addressed to each selection unit, and each control signal processing unit synchronizes with the control frame signal to output a constant frame period. The processing result is output later. However, the failure information of each selection unit may be collected while sequentially completing the transmission and response processing for each selection unit.

In this embodiment, the monitoring of the two selection circuits has been described, but it goes without saying that the present invention can be applied to a selection circuit monitoring system that selects two or more signals, and the selected signals are clock signals. The signal is not limited to a signal and may be a data signal.

[0029]

As described above, according to the invention described in claims 1 to 5, the gate of the selection section is made conductive for each destination of the control signal supplied from the control section, whereby the selection section is provided. The fault monitoring means collects fault information as a comparison result of the comparison units generated in the first and second transmission lines transmitting the selection signal. Therefore, it is possible to detect the mismatch of the selection signals for each selection unit. Moreover, since the processing amount of the control unit does not increase, the circuit scale can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a selective system 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 / received between 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 System Generation Section 12 _{1 to} 12 _N Selection Section 13 Control Section 14 Selection Signal Generation Section 15 Comparison Section 20 _{1 to} 20 _N Selector 22 _{1 to} 22 _N Gate 23 ₁ to 23 _N Control Signal Processing Section 27 Control Signal Transmission Section 28 Control signal receiver

Claims (5)

[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 gate having one end connected to an input terminal of the selector. A destination discriminating means for receiving a control signal and discriminating whether or not it is destined for itself, a gate control means for electrically connecting the gate at a predetermined timing when the destination discriminating means discriminates itself as a destination, and the selector And a plurality of selection units having a failure monitoring unit for monitoring a failure such as the above, and the one ends of the gates of these selection units are commonly connected via a first transmission path, and these selectors have a plurality of types. A selection signal generator that supplies a selection signal for selecting any one of the signals in common and all at once, and a common connection to the other ends of the gates of these selectors via the second transmission path. And a comparing unit for comparing the signal appearing on the second transmission line with the signal generated by the selection signal generating unit at this time, and a transmitting unit for transmitting the comparison result to the failure monitoring unit of the plurality of selecting units. A selection comprising: a selection system generating section having the control section; and a control section that supplies the control signal to the plurality of selection sections and receives failure information regarding a failure from failure monitoring means of these selection sections. System monitoring system. 2. The plurality of signal generators are different clock signal generators, respectively.
Selective monitoring system described. 3. The control frame signal, wherein the control unit is connected to a plurality of selection units through a common transmission line, and includes destination information for identifying each selection unit and control data for controlling the selection unit. 2. The selective system monitoring system according to claim 1, wherein the control unit is sent to the common transmission line. 4. The control unit is connected to a plurality of selection units via a common transmission line, and the control unit sends a control signal for controlling the gate of each selection unit at a predetermined time interval after a predetermined reference signal, 2. The gate control means of each selector receives the reference signal and decodes the received control signal after a lapse of the time allotted to itself to control the gate. System monitoring system. 5. The fault monitoring means detects a fault of the entire selection unit of its own, incorporates the result into a packet signal together with identification information of its own selection unit, and is provided in common between the control unit and each selection unit. 2. The selective system monitoring system according to claim 1, wherein the selective system monitoring system transmits the selected system to the selected transmission line.