JPS6388947A - Trouble processing method for exchanging system - Google Patents

Abstract

PURPOSE:To facilitate a trouble diagnosis by separating an external line and an extension from a network, connecting directly the external line and the extension to secure the minimum limit line, and stopping the exchange processing of a central control device when a fixed trouble occurs at an exchanging system. CONSTITUTION:When a trouble occurs at an exchanging system, a central control unit 1 retries the restarting processing program concerting the trouble position until the trouble is recovered and tries the trouble recovery. When the value of a trouble detecting counter 11 exceeds the specified value in a constant period by a fixed trouble, etc., the trouble is judged to be a fixed trouble and retrying is stopped. A line bypass device 2 is activated, the line wire and the extension are separated from a network 3 and these are directly connected. The central control unit 1 stops an exchange processing action, a communicating control processing at the section of a maintenance device 9 is executed and the test and trouble diagnosis by a remote control are executed.

Description

[Detailed Description of the Invention] [Summary] When a fixed failure occurs in the switching system, the external line and internal line are disconnected from the network, the external line and internal line are directly connected to secure the minimum number of lines, and the central control unit is replaced. This is to stop the processing operation and make it easier for the maintenance equipment etc. to understand the failure information.

[Industrial application field]

The present invention relates to an improvement in a switching system failure handling method relating to maintenance operations when an unrecoverable fixed failure occurs.

For example, a private branch exchange system, which is the center of office automation, is equipped with various functions such as not only telephone calls but also data storage and exchange, e-mail, etc., and operational reliability is also considered.

If a failure occurs, a restart processing program that restores the operation of the failed part will be executed to attempt failure recovery, but if failure recovery becomes impossible, initial program loading (hereinafter referred to as IPL) will be repeated or operation will stop. To avoid system lock-up, disconnect external lines and internal lines from the network, connect external lines and internal lines directly to secure the minimum number of lines, and stop the exchange processing of the central control unit to prevent system lock-up. There is a need to provide a method for handling switching system failures that avoids such problems and allows maintenance operations to be performed.

[Conventional technology]

FIG. 3 is a block diagram of a conventional switching system.

In the figure, the exchange system includes a program for exchange control,
Through cooperation between the storage device (MEM) 5 that stores data and the central control unit (CPU) 1,
D) Controls the switching network 3 via 4 and performs switching connections between predetermined lines.

In order to handle failures in such a system, there are a failure detection unit that detects failures related to communication path control in the network 3, a failure detection unit that detects malfunctions in the logic circuits and programs of the central control unit 1, and data reading and writing in the memory device. The system is equipped with a failure detection unit that detects failures such as the following.

When each of the above fault detection units detects a fault, the central control unit 1
The fault handling unit is activated. As for fault processing, it is determined where the fault is, and in order to restore the operation of that part, a restart processing program including IPL etc. for that part is executed and an attempt is made to restart the operation.

In this case, the fault condition is displayed on the maintenance device 7, but
If the fault is not recovered, the system will be in a lock-up state, so testing or diagnosis cannot be performed from the maintenance device 7.

In addition, when the exchange operation becomes impossible due to a simple failure such as a power outage, the line bypass device 2 is activated by the power failure detection circuit 6, etc., and disconnects the outside line and extension line from the network 3 using an internal switching relay, etc. The outside line and the extension line are directly connected to secure the minimum number of lines, but even if there is a complex and important failure such as the one mentioned above (for example, a system lock-up state), the system will not operate due to a failure inside the system.

[Problem that the invention seeks to solve]

In conventional switching systems, when a system lock-up occurs due to a failure, switching operations are not performed, so calls cannot be received from outside lines or calls can be made from internal lines, and maintenance equipment is used to determine the status of the failure. There is a problem that cannot be done.

[Means for solving problems]

Basically, the present invention detects a system failure including software runaway by a timeout of a failure timer (TF timer), and sends an NMr (Non Maskable
Interrupt) An interrupt is applied and the process moves to restart processing.

When a system failure is detected again within a certain period of time, the number of timeouts of the failure timer is counted by a failure detection counter (TF counter), and a fixed failure occurrence is indicated by the overflow of this counter.

At this time, the line bypass circuit is activated to secure the minimum line, and the restart process is stopped to enable maintenance operations, such as communication with an external maintenance device.

FIG. 1 is a diagram explaining the principle of the present invention.

The TF timer 10 counts at a fixed period, and when the timeout reaches t.
A JMI interrupt is applied to the central control unit, and the TF counter 11 is updated.

When an interrupt occurs, the TF counter 11 is first successively input (S1)
, determine the TF counter value (S2).

If the TF counter value does not exceed the predetermined value, restart processing is performed (S3), and the TF timer 10. Clear TF count 11 (S4). Therefore, the TF counter is normally cleared at regular intervals and no abnormality is detected.

On the other hand, if a failure occurs in the control system or memory system, which is the core of the system, the system restart process will be retried. If this retry continues, the TF counter 11, which counts the number of timeouts from the TF timer 10, will no longer be cleared, and if this state continues, the TF counter value will exceed a predetermined value.

The line high-bus circuit 2 is activated by this overflow of the TF counter 11, and the lines are connected, and the central control unit 1 transfers control to communication control processing to enable communication with the outside (S5).

[Effect]

When a failure occurs in the exchange system, the central control unit attempts to recover from the failure by retrying the restart processing program, including IPL, etc. related to the failed part, until the failure is recovered.
If the value of the TF counter 11 exceeds the specified value within a certain period due to a fixed fault or the like, it is regarded as a fixed fault, retry is stopped, and the line bypass device 2 is activated. For this reason, the outside line and the extension line are separated from the network 3 and directly connected to ensure a minimum number of lines.

In addition, since the exchange processing operation is stopped and the communication control processing is started, testing and failure diagnosis can be performed by remote control.

〔Example〕

The present invention will be specifically explained below with reference to illustrated examples.

FIG. 2 is a block diagram of a switching system as an embodiment of the present invention. The same reference numerals indicate the same objects throughout the figures.

In FIG. 2, under program control, the central controller 1
The control of the network 3 via the signal distribution device 4 by the cooperation of the storage device 5 and the storage device 5 is the same as that described in FIG.

7) The work 3 is a communication line switch for exchanging outside lines and extension lines, and is controlled by the central control unit 1.

Therefore, in the present invention, when a fixed fault is detected, a relay in the line bypass circuit 2 is activated to directly connect the outside line and the extension line, which are normally connected to the network 3, thereby bypassing the switching system.

At this time, a modem (MOD
The central control device 1 and the remote maintenance device are connected via the signal line f via the EM) 91, and the communication control function of the central control device 1 realizes remote maintenance.

The fault processing is performed by scanning the value (d) of the TF counter 11 that counts the number of times of the timeout output (a) of the TF timer 10 and the number of timeout outputs (b) of the TF counter 10.
N) This is performed by the central control device 1 detecting it via 8.

On the other hand, the central control device 1 periodically or after the system restart process uses the normal route to install the TF controller 10. The TF counter 11 is cleared by the reset signal cLc2 via the signal distribution bag Z (SD) 4.

The line bypass circuit 2 is activated by an overflow of the TF counter 11, and returns to the normal state by resetting the counter.

The above control processing flow is as described above.

〔Effect of the invention〕

As explained above, according to the present invention, by determining a fixed failure, the outside line and the extension line are directly connected without going through the network, securing the minimum number of lines, continuing communication with the outside, and performing switching operations. By stopping the system, a system lock-up state can be avoided, and by performing maintenance operations, it is possible to perform failure recovery processing.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the principle of the present invention, FIG. 2 is a block diagram of an exchange system as an embodiment of the present invention, and FIG. 3 is a block diagram of a conventional exchange system. In the figure, 1 is a central control unit, 2 is a line bypass circuit, 3 is a network, 5 is a storage device, 6 is a power failure detection circuit, 10 is a failure detection timer, and 11 is a failure detection counter. ``Boss'' month ≦su, % reason month 2 and a half 1 /E 荏 連 complete crime and 7 development system bro 2 ■ bud 2 of

Claims (2)

[Claims] (1) A fault detection counter (11) that detects a fault in a switching control device that performs switching connections under program control; and a line bypass circuit (2) that connects lines in the event of a power failure, etc.
), the fault detection counter (11) is read at predetermined time intervals (S1), and if the fault detection counter value does not exceed a predetermined value, system restart processing (S3) is performed to detect the fault. If the detection counter value exceeds a predetermined value, activate the line bypass circuit (2),
A switching system failure handling method characterized by connecting lines. (2) When the failure detection counter value exceeds a predetermined value, the line bypass circuit (2) is activated, and the exchange control device activates a communication control processing means to enable communication with the outside. 2. A switching system fault handling method according to claim 1, characterized in that: