JPH0113795B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a control system for a distributed control type automatic switching system that includes both a control unit that controls terminals and a control unit that controls the entire system.

Conventional configuration and its problems Conventionally, in a system equipped with a large number of terminals,
It is difficult to control all of a large number of terminals with one control unit due to control time delays, processing capacity, etc. Therefore, terminals are broadly categorized and distributed among multiple control units, and all control units are controlled by one control unit. In order to reduce the load on the controller or to improve functionality, methods such as separating the control units are often used. In these load-balancing or function-distributing systems, each control unit needs to be relatively slow and have a small processing capacity, which has many advantages such as lower system costs and high expandability. . On the other hand, data must be exchanged in each control unit, and transmission errors or data misunderstandings may occur during data exchange.

When these occur, the sequence becomes abnormal, the terminal system is held in an invalid state, and the terminal becomes unusable, or in the worst case, there is a risk that it may lead to system down. It was hot.

OBJECTS OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned conventional problems and to prevent resources from being held invalid or malfunctioning.

Structure of the Invention The present invention periodically checks the operation data of each control unit when the above-mentioned transmission error or misunderstanding in data transmission occurs, and if there is an abnormality in the contents, it automatically corrects the data. As a result, a means has been realized that allows each control section to operate normally as a system.

DESCRIPTION OF EMBODIMENTS The present invention will be explained below by way of an embodiment thereof with reference to the drawings. In Figure 1, 1 is an extension telephone, 2
3 is a subscriber circuit, 3 is an extension control unit (hereinafter abbreviated as LPU (ST)) that controls the extension telephone, 4 is an operator console, and 5 is a console controller that controls the operator console (hereinafter abbreviated as LPU (AT)). ) 6 is a connection network, and 7 is a central control unit (hereinafter abbreviated as NPU) that controls the resource status of the entire system.
8 is the local line control unit (hereinafter referred to as LPU (CO)) that controls the local line.
) 9 is a central office line trunk; 10 is an input/output control unit (hereinafter abbreviated as SPU) 11 that controls input/output devices;
is an input/output device consisting of type CRT, etc. LPU
(ST) 3, LPU (AT) 5, and LPU (CO) 8 are collectively called the terminal control unit. In Figure 2, 12 is the bus line (Bus High Way), 13 is the first message from the central control unit to each LPU 3, 5, and 8, 14 is the message from each LPU, and 15 is the first message to each LPU. 2, 16 is a message to SPU 10, 17 is a periodic processing task (Task) of central control unit 7, 18 is also a resource management task, 19 is a resource management table, 20
is a message sent to the resource management table 19.

Next, the operation will be explained.

First, the extension phone is in use or not in use.
A case where the states of LPU (ST) 3 and NPU 7 are different will be explained.

When the extension telephone 1 is taken off-hook, its status is notified to the LPU (ST) 3 through the subscriber circuit. On the other hand, the status is also notified to the NPU 7 that manages the resources at the same time.

However, if the notification is not made for some reason, a mismatch between the states of the LPU (ST) 3 and the NPU 7 will occur. In this case, the LPU (ST) 3 knows the status of extension telephone 1.
It's on the side. Therefore, since the LPU (ST) 3 side is correct, it is necessary to correct the state of the NPU 7.

In addition, the LPU (AT) that controls operator console 4
5 is in NON, UDA state (Here, UDA state is a state in which a call is received from a station, and when the operator is absent, the call is received on a pre-specified extension phone.) When the NPU 7 side is in UDA state, , the state is consistent with LPU (CO) 8, which controls the central office line, so it controls the entire system.
Since NPU 7 seems to be correct, in this case, it sends a UDA start message to LPU (AT) 5 and starts the UDA service.

In addition, when a discrepancy occurs in which the extension telephone is undefined on the LPU (ST) 3 side and defined on the NPU 7 side, it is not possible to determine which is correct, so in this case, from the periodic processing task 17 in the NPU 7, , sends (error message) telegram 16 to SPU 10, input/output device 11
Inform the maintainer by displaying a message to that effect.

Next, in Figure 2, each cycle time is specified by the user.
The first message 13 is sent from the periodic processing task 17 to the LPU (corresponding to 3, 5, and 6 in FIG. 2),
The resource status of each LPU is known from the returned message 14, and the status is checked by the periodic processing task 17. That is, the resource management table 19 of the NPU 7,
Based on the predetermined priority of LPU and NPU resource states (used/unused, UDA/NON/UDA, undefined, etc.), as a result of the status check, it is necessary to modify the resource status 12 of NPU 7. If so, the resource management task 18 is requested to make a correction, and the resource management task 18 sends a message 20 to the resource management table 19 and corrects the table.

In addition, if the resource status of LPUs 3, 5, and 8 needs to be corrected during the status check, the periodic processing task 17 sends the second message 15 (for correction) to the relevant LPU, and , 8 match the resource status of NPU 7.

Further, if the status check shows that there is a contradiction in the resource status, the periodic processing task 17 sends an (error message) telegram 16 to the SPU 10, displays the contents of the error message on the input/output device 11, and notifies the maintenance personnel.

Effects of the Invention As explained above, according to the present invention, the central control unit is provided with a resource management table, and messages are periodically redone between the central control unit and the terminal control unit to correct difficult differences in resource status between the two. If an error occurs, one of the conditions is automatically corrected based on the priority set in advance, or an error message is output via the input/output device, so each state can be processed independently. This has the advantage of preventing resource invalidation or abnormal operation due to discrepancies in the status of each control unit in an automatic switching system.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a device using a control system for an automatic exchange according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of its main parts. 3... Extension control unit, 5... Table control unit, 7... Central control unit, 8... Line control unit, 10... Input/output control unit, 11... Input/output device, 13-16, 20...
...Telegram, 17...Periodic task, 18...Resource management task, 19...Resource management table.

Claims (1)

[Claims] 1. A distributed processing system consisting of a terminal control unit that controls a plurality of terminal systems and a central control unit that controls the resources of the entire system, and the central control unit controls the terminal control unit and the central control unit at each cycle time. A control method for an automatic switching system in which the resource management status of a control unit is collated and the status of the terminal control unit or central control unit is corrected according to a predetermined priority.