JPS6184950A - Exchanging system - Google Patents

Abstract

PURPOSE:To report occurrence of abnormality of a CPU and to remove a failed controlling device from operation by connecting 1 circuit of every input group unit as a circuit to be tested, and examining whether connecting action of the system in normal or not by periodical switching. CONSTITUTION:Exchange controlling devices SPU11-13 connected to signal lines 101-103 are connected to the central processing unit CPU3 of an exchanging system through a channel network 2. One circuit in the circuit group contained in SPU11-13 is connected to test dial-tone devices 51, 52 respectively through a switching device 10. The devices 51, 52 make automatically calling, connection information and a series of predetermined test calling at a fixed perion according to time information from a clocking device, and checked whether reply is sent from devices 11-13 responding to individual action. When the devices 51, 52 can not obtain expected reply, a trouble signal is applied to a trouble monitoring device 6, and the number of devices 11-13 is reported from the device 6 to the CPU3. The device 11-13 of that number is removed from operating state.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention is directed to a central processing unit, a circuit, and a communication system distributed in units of line groups. This invention relates to a failure monitoring method for a switching system equipped with a system.

(Prior Art) Conventionally, in exchange systems, a fault detection circuit has been provided for each hardware or software function, and during operation, it has been checked whether each function is functioning normally. Furthermore, in order to compensate for the parts that cannot be inspected by the above-mentioned detection circuit, a method is adopted in which a test call is given periodically from the line in the same way as a call on a real line to check whether the call can be processed normally. It's here.

FIG. 2 is a block diagram for explaining a conventional switching system. In the example shown in FIG. 2, 11 to 16 are exchange control devices, 2 is a communication network, 6 is a central processing unit, 4 is a trial device, and 101 to 106 are communication lines, respectively.

In FIG. 2, a communication line 1 is equipped with a central processing unit 6 and a plurality of exchange control units 11 to 13 distributed in line group units.
01 to 103 are connected to the communication path network 2 that connects the exchange control devices 11 to 13. Even in such switching systems, tests are performed on test calls. However, the test device 4 is provided for the central processing unit 6.

The central processing unit 6 has many processing functions, and a failure thereof affects all organs. Two specific switching control devices among the switching control devices 11 to 16 (one line each from the group of lines to be carried are selected and connected to the test device 4, and calls are periodically made and calls are terminated. All test devices 4 check whether responses to these operations are obtained from the central processing unit 3 via the exchange fee @ devices 11-13.

At the end of the test, if any abnormality is detected from these two calling devices, it is recognized as a failure of the central processing unit 3.

(1 point until the invention is solved) However, recently, the initial equipment has been made smaller to make system introduction easier, or the exchange of different signal systems, such as between telex and data communications, can be done using the same system. Distributed exchange control devices 11 to 13 for processing and economical
The central processing unit 3 is equipped with line-compatible processing functions.
Systems that are more compact are being developed. In such a system, the frequency of failures in the distributed exchange control devices 11 to 13 is not necessarily low, and as explained above, testing only the central processing unit u6 may not be a sufficient test. There was a problem.

An object of the present invention is to provide a switching system equipped with a central processing unit and a switchable cape that is distributed to each line group, and to connect at least one line in each line group as a line under test to perform the connection operation of the switching system. The above-mentioned problem is eliminated by periodically switching and inspecting whether or not it is normal, and when detecting the occurrence of an abnormality, determining the content of the abnormality and instructing the central processing unit, To provide a switching system that connects a test calling device to each switching device, removes the returned switching control device from operation, and at the same time detects a failure in the central processing unit. I will vc.

(Means for Solving the Problems) The switching system of the present invention is designed to include a central processing unit and a switching control device with a number of fcy distributed in each line group, and furthermore, It is provided with a plurality of test calling means, a switching means, and a failure determination means.

The plurality of test calling means connect at least one line in each line group as a line to be tested, and periodically test whether or not the connection operation is normal.

The switching means is for switching the connections between the plurality of test calling means and the line under test so as to match the cycle of the above-mentioned test.

When the fault determining means receives information indicating an abnormality from the connected test calling means, it determines the content of the abnormality and issues an instruction to the central processing unit.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment for realizing a switching system according to the present invention. In Figure 1, 1
1 to 13 are respectively switching control devices, 2 is a communication channel network, 3 is a central processing unit R151, 52 is a test calling device, and 6
7 is a central processing unit failure determination device, 8 is an emergency failure alarm, 9 is a switching control device, 10 is a switching device, and 101 to 10δ are communication lines, respectively. In FIG. 1, a plurality of switching control devices 11 to 16 are provided in a line group, and the communication circuits of the switching control devices 11 to 13 are connected to each other. 101
-103 are connected to the communication path network 2 that connects the exchange control #devices 11 to 130, and a control signal line 104 is connected to the central processing unit 3. The exchange control devices 11 to 13 perform processing on the originating side and the receiving side according to the type of signal system of the line group, and exchange information necessary for connection of the communication network 2 with the central processing unit 3 using data in a unified format. exchange. In addition to the above, the central processing unit 3 also performs processing related to maintenance and operation of the overall system.

On the other hand, one line in the line group accommodated in each of the switching control devices 11 to 13 is connected to the trial calling device [51, 52] through the switching device 10t. The test calling devices 51 and 52 use time information from a clock device (not shown) to perform a predetermined series of calls from calling to sending connection information and ending the call at a constant cycle (for example, every 3 minutes). A test call is generated completely automatically, and a scheduled response corresponding to each operation is made by the exchange control ill devices 11 to 16.
Check whether it is sent out from the source or not. Test calling device 5
1.52, a fault signal is sent to the fault monitoring device 6 when the expected response is not obtained.

The fault monitoring device 6 informs the central processing unit #6 of the number of the switching control device connected at the time of receiving the fault signal, instructs the central processing unit #6 to remove the switching control device with this number from the operational state, and further detects the occurrence of a fault. is transmitted to the central processing unit fault determination device 7 to cause the emergency fault alarm 8 to display an error.

If a test calling device is installed on a one-to-one basis for each line under test, it would be uneconomical in a large system with many switching control devices because the number of test calling devices would increase. Therefore, a switching device is provided between the line under test and the test call originating device, and a fault monitoring device [ii6] operates the switching device 10 for the switching control device 9 after the testing of the test call is completed. and the test calling devices 51 and 52, and sequentially,
Test all test lines.

Let us now assume that the number of test calling devices is two, and that the operation period of the test call and switching device 10 is eT.

In this case, if the failure monitoring device 6 notifies the occurrence of a failure twice within the time T, the central processing unit failure determination device 7 can determine that the central processing unit 3 is at fault. Further, in the above, if the failure monitoring device 6 reports the occurrence of one failure within the time T, it can be determined that there is a failure in the O exchange control device during the test. The above fault determination result is transmitted to the emergency fault 9 alarm device 8. In addition, in the above explanation, it is assumed that the test calling devices 51 and 52 perform a series of test operations and immediately send out a failure signal 'when the expected response is not obtained. Immediately when no response was obtained, a second series of test operations was performed,
When the expected response was not obtained in the second test, was it an accidental error by sending out a failure signal? : It can be handled to prevent it from becoming a problem.

In addition, although the above embodiments have been described and explained assuming that there is only one central processing unit, in a system equipped with a redundant central processing unit using the # line backup method, the output of the central processing unit failure determination device can also be used as a switching word for the central processing unit.

(Effects of the Invention) As described above, the present invention provides a switching system that includes a central processing unit and switching control devices distributed in line group units, in which at least one line in each line group unit is connected as a gold wave test line. In addition to periodically switching and checking whether the connection operation of the exchange system is normal (Z>-), when an abnormality is detected, the content of the abnormality can be determined and an instruction can be given to the central processing unit. This has the advantage that the replaced control device that has returned to its base can be removed from operation, and that failures in the central processing unit can be quickly determined.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of implementing an exchange system according to the present invention. FIG. 2 is a block diagram showing an example of implementing an exchange system according to the prior art. 11-13. ... Exchange fee (foundation) device 2 ... Communication channel network 6 ... Central processing unit 4 ... Test device 51 #52 ... Test calling device 6Φ ... Fault monitoring device 7 @ ... Central processing Device failure determination device 8@...Emergency failure alarm 9...Switching control device 10...Switching devices 101 to 104...Signal line

Claims (1)

[Claims] In a switching system equipped with a central processing unit and a plurality of switching control devices distributed in line group units, at least one line in each line group unit is connected as a line under test, and whether the operation of the connection is normal. a plurality of test call originating means for periodically testing whether or not the test call originating means is present; a switching means for switching the connection between the plurality of test call originating means and the line under test in accordance with the cycle of the test; and a fault determining means for determining the content of the abnormality and giving an instruction to the central processing unit when receiving information that there is an abnormality from the test calling means that has been detected. exchange system.