JPS63151155A - Fault detection system for space-division switch - Google Patents

Abstract

PURPOSE:To obtain the fault information of a space-division switch by comparing output information obtained from the output line of a second switch with the output of a signal disconnection detecting circuit on the corresponding output line of the space-division type switch by a fault discriminating part. CONSTITUTION:The second switch 11 is provided which has input/output lines assigned to respective the input/output lines of a space-division switch 1 as the object of fault detection in 1:1 and receives the outputs of signal disconnecting detecting circuits 2 and 2', which are provided on the input lines of the space-division switch 1, by corresponding input lines. The second switch 11 is controlled to the same bus connection state as the space-division switch 1 by a control part 7, and the outputs of signal disconnecting detecting circuits 2 and 2' on the input lines of the space-division switch 1 are inputted to the corresponding input lines of the second switch 11. In this case, output information obtained from output lines of the second switch 11 is compared with the output of the signal disconnecting detecting circuit 2 corresponding to the output lines of the space-division switch 1 by a fault discriminating part 8. Thus, the fault information of the space-division switch is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fault detection method for a space-divided switch [Prior art] As a conventional technology for a fault detection method for a space-divided switch, for example, the patent application There is one proposed in No. 188833/1983. The conventional technology proposed here includes a first memory that stores information indicating the presence or absence of a communication signal for each outgoing line of a space-division type switch, and a second memory that stores connection control information for the space-division type switch. a memory, the first memory writes information indicating the presence or absence of the communication signal each time the presence or absence of the communication signal changes, and the second memory writes information each time the presence or absence of the communication signal is controlled. When detecting a fault in the space-division switch, the communication signal presence/absence information stored in the first memory and the connection control information stored in the second memory are written. Based on the communication signal presence/absence information and the connection control information, it is determined whether or not a failure has occurred at the crosspoint corresponding to the outgoing line of the space division type switch.

This conventional technique will be explained in detail below with reference to FIG. In FIG. 2, reference numeral 1 denotes an NXM matrix-sized space-division type switch, with the input side terminal on the left side of the figure and the output side terminal on the right side. A signal disconnection detection circuit 2 is connected to the output terminal of the switch 1 in correspondence with the line, and its detection output is used to switch between the idle signal from the idle signal generator 3 sent out when there is no call and the output line of the switch 1. This signal becomes a switching control signal for the selector 4 to perform the switching, is collected by the collection unit 5, and is written to the memory unit 6 as connection status information for each output line.

Here, when the signal disconnection detection circuit 2 detects a signal disconnection, the signal from the idle signal generator 3 is selected by the selector 4. This is to mask the detection of a signal disconnection in the signal disconnection detection circuit of the next stage device.

The control section 7 performs path connection control of the space division switch 1, and the connection control signal is written into the memory section 9 as connection control information for each output line via the order conversion section 10. The fault monitoring information is transmitted to the memory section 9 and the memory under the control of the control section 7. [Problems to be Solved by the Invention] Next, problems of the conventional technology as typified by the above-mentioned example will be described. In the conventional fault detection method shown in FIG. By doing so, I was gaining.

However, this information includes not only the failure of the space division type switch 1 but also the failure of its input line. For this reason, it was necessary to separate the two. For this purpose, conventionally, as shown in FIG. 3, a signal disconnection detection circuit 2'', an idle signal generator 3', and a selector 4'' are also installed on the input line side.
In the event of an input line failure, the detection by the output line signal disconnection detection circuit 2 is masked by sending an idle signal, or the signal disconnection detection circuit 2 is sent to the input line as shown in FIG. Only i2′ is installed and using this detection result, ij! It was necessary to mask the result of the above-mentioned failure interval section 8 by software processing, and to obtain information only from the space-division type switch l.

The former method requires an increase in hardware for the line handling section, while the latter method requires software processing for mask processing.

The present invention solves the above problems and does not involve software processing.
Another object of the present invention is to provide a method for detecting a fault in only a space-division type switch using simple hardware without increasing the amount of hardware in a line support section.

[Means for solving problems]

According to the present invention, the above problem can be solved by a signal disconnection detection circuit that is provided for each input/output line of a space division type switch that is a target of fault detection and detects the presence or absence of a communication signal of the input/output line; An input line that has input and output lines assigned to the input and output lines of the space division type switch in a 1:1 correspondence, and that corresponds to the output of the signal disconnection detection circuit provided in the input line of the space division type switch. a second switch that receives the signal from the second switch, a control section that controls the connection of the space division type switch, a signal disconnection detection signal that appears on the output line of the second switch, and a control unit that is provided for each output line of the space division type switch. a failure determination unit that determines a failure by comparing the signal disconnection detection signal output from the signal disconnection detection circuit, and the control unit connects the second switch to the same path as the space-divided switch. and input the output of the signal disconnection detection circuit in the corresponding input line of the space division type switch to the input line of the second switch, and at this time, the output of the signal disconnection detection circuit in the corresponding input line of the space division type switch is inputted to the input line of the second switch, and at this time, the output of the signal disconnection detection circuit in the corresponding input line of the space division type switch is inputted to the input line of the second switch. By the fault detection method of the space-division type switch, the fault information of the space-division type switch is obtained by comparing the output information with the output of the signal disconnection detection circuit in the corresponding output line of the space-division type switch in the failure determination section. resolved.

[For production]

A signal disconnection detection circuit having an input/output line assigned in a 1-to-1 correspondence for each input/output line of the space-division type switch that is the target of fault detection, and provided on the input line of the space-division type switch. A second switch is provided which receives the output of the space-division type switch on a corresponding input line, and the second switch is controlled by a control unit to have the same path connection state as the space-division type switch, and the second switch receives the output of the space-division type switch on its input line. The output of the signal disconnection detection circuit is input to the corresponding input line of the second switch, and at this time, the output information obtained from the output line of the second switch and the signal disconnection detection in the corresponding output line of the space division type switch are input. By comparing the outputs of the circuits in a fault determining section, fault information of the space division type switch is obtained.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an NXM matrix-sized space-division switch that is the target of failure detection, with the input side terminal on the left side of the figure and the output side on the right side. side terminal, 2.2゛ is a signal disconnection detection circuit,
3 is an idle signal generator, 4 is a selector, 5.5' is a collection section, 6 and 6' are memory sections, 7 is a control section, 8 is a fault determination section, and 11 is a second switch.

A signal disconnection detection circuit 2 is connected to the output side terminal of the space division type switch 1 in correspondence with the line, and its detection output is a signal from the idle generator 3 sent out when there is no call and a signal from the signal space division type switch 1. The signal serves as a switching control signal for the selector 4 that switches between the output lines, is collected by the collection unit 5, and is written into the memory unit 6 as connection state information for each output line.

Here, when the signal disconnection detection circuit 2 detects a signal disconnection, the idle signal from the signal generator 3 is selected by the selector 4. This is to mask the detection of a signal disconnection in the signal disconnection detection circuit of the next stage device.

The control unit 7 controls the path connection of the space division type switch 1, and also controls the second switch 11 to be in the same path connection state as the space division type switch 1.

The detection output of the signal disconnection detection circuit 2' connected to the input line of the space division type switch 1 is collected by the collection unit 5', and
input to the input line of the switch 11 of the memory 6.
' is written as connection status information for each input line.

This is the second switch, and is given the same connection control information as the space division type switch 1 by the control unit 7, and is set to the same path connection state as the space division type switch 1. The output of the signal disconnection detection circuit 2' provided for each input line of the space division type switch 1 is input to the input line of the second switch 11. Therefore, the signal disconnection detection output is output to the output line of the second switch 11 depending on the connection state of the space division type switch 1. 8 compares the output of the second switch 11 with the output of the signal disconnection detection circuit 2 on the output line side of the space division type switch 1 in correspondence with the output line, and detects the signal for each input/output line of the fault type switch 1. The output of the disconnection detection circuit 2.2' is
“H” when a disconnection is detected, “L” when a signal is detected
Suppose we want to output . Further, it is assumed that the output line of the second switch 11 outputs "■" when there is no path connection. The number of states is as follows: 4. 'j) becomes.

(2) When (the output of the second switch 11 = L, the output of the output line signal disconnection detection circuit 2 = L), it is determined that there is no faulty call of the space division type switch 1 during a call.

(2) When (H, H), it is determined that there is an input line failure or a no-call state, and that there is no failure of the space division type switch 1. (Input line failure can be detected by reading out the memory 6) (L, H): At this time, the communication state is active and the input line is normal, so it is determined that the space division type switch 1 has a failure.

■ When (H, , L), it is determined that there is a failure in the space division type switch 1. The most likely case is that the call ends and
This is a case where the path is not disconnected even though a bus disconnection order has been sent.

Through such a simple comparison and judgment process, fault information for only the space-divided switch 1 can be obtained.

Here, the second switch 11 can be realized with a small amount of 7X by using, for example, a time switch composed of a call memory and a holding memory. This type of switch can be easily obtained by using one already configured as an LSI.

As is clear from the above results, compared to the conventional technology,
Since the amount of hardware in the line handling section is small and switch fault determination processing can be performed autonomously using hardware without the need for software processing, it is suitable for making the path monitoring function of space-division switches more sophisticated, compact, and economical. .

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to detect a fault in a space-divided switch with simple hardware without using software processing and without increasing the amount of hardware in the line handling section. This has the effect of economically increasing the sophistication of the monitoring function.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a block diagram of an example of a fault detection method for a space-division switch according to the prior art, FIG. 3 is a block diagram of a different example, and FIG. is a block diagram of a further different example. ■... NXM matrix size space division type switch, 2, 2'... Signal disconnection detection circuit, 3, 3'... Idle signal generator, 4.4'... Selector, 5゜5 ′
...Collection unit, 6.6'...Memory unit, 7...Control unit, 8...Fault determination unit, 9--Memory unit, IO...
・Order conversion unit, 11...Second switch patent applicant Nippon Telegraph and Telephone Corporation agent Patent attorney Kugobe Tamamushi (2 others) Presentation of professional diagram of the embodiment of the present invention in Figure 1 9199 diagram of an example of the 80,000 system failure detection method for a space-divided switch based on technology 1. Figure 2: Block diagram of different examples of fault detection methods for a space-divided switch based on the presented technology.

Claims (1)

[Scope of Claims] A signal disconnection detection circuit that is provided for each input/output line of a space-divided switch that is a target of failure detection and detects the presence or absence of a communication signal on the input/output line; 1:1 for each output line
a second switch having an input/output line assigned to a corresponding input line and receiving an output of a signal disconnection detection circuit provided on an input line of the space-division type switch on a corresponding input line; a control unit that controls the connection of the split type switch; a signal disconnection detection signal appearing on the output line of the second switch; and a signal disconnection detection signal output from a signal disconnection detection circuit provided for each output line of the spatial switch. and a fault determination unit that determines a fault by comparing the two switches, and the control unit controls the second switch to be in the same path connection state as the space-division switch, and The output of the signal disconnection detection circuit on the corresponding input line of the space division type switch is input to the line, and at this time, the output information obtained from the output line of the second switch and the corresponding output line of the space division type switch are input. A failure detection method for a space-division type switch, characterized in that failure information of the space-division type switch is obtained by comparing outputs of signal disconnection detection circuits in the failure determining section.