JPS5871757A - Remote information preserving system - Google Patents

Abstract

PURPOSE:To perform a relieving process for a call under continuation when stored information is destructed, by recording the information stored in a spare processor in a preserving file of a switchboard at a master station via a communication link. CONSTITUTION:A remote line concentrator 1 contains using/spare processors 12-1/12-2 and using/spare stoage devices 13-1/13-2 and receives the exchange control information via using/spare communication links 3-1/3-2 provided between the concentrator 1 and the switchboard 2 of a master station. The processor 12-1 writes the same information in parallel to the devices 13-1 and 13-2. While the processor 12-2 reads out the information stored in the device 13-2 in a prescribed period and transfers it to the switchboard 2 via the link 3-2. The switchboard 2 records the received information to a preserving file 28.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote information storage system, particularly for current and pre-processing scissors1. The present invention relates to a remote information storage method in a switching system in which a remote concentrator having working and backup storage devices exchanges exchange control information via working and backup communication links provided between a master exchange and a master exchange.

Figure 1 is a diagram showing an example of a conventional remote information storage method in the heat exchange system with the company.
I2 and a remote equipment 1 accommodating subscribers located in remote areas from the master exchange 2. The remote line concentrator 1 concentrates communication lines (not shown) provided between accommodated subscriber lines (not shown) and the master exchange 2 (not shown). Establish *ii network 11. The remote network 11
Processing devices 12-1 and 12- that control connections via
2. Storage device 13-1 that stores various information indicating connection status
Since the connection control of the 0 remote collection device 1 in which 0 and 13-2 are distributed is all performed under the control of the master exchange 2,
Control information issued from the central processing unit 122 in the master exchange 2 and the processing unit 12-1 in the remote concentrator 1
The control response information emitted from the front 12-2 is sent to the communication control device 14-1 in the remote line concentrator 1 or the line 14-2,
Digital trunk 15-1t or 16-2, communication control device 26-1t or 26-2 in master exchange 2, digital trunk 25-1 or 25-2, remote concentrator l and master exchange 2 and 2 via a communication link 3-1t or 3-2.

Each of the devices constituting the remote line concentrator 1 that is operated unmanned is duplicated, one of which operates as an active device and the other of which is on standby as a standby device. If the active device in operation becomes inoperable due to a failure, etc., the backup device immediately starts operating as the new active device and strives to continue the exchange connection operation. However, storage devices 13-1 and 13-2 As for the backup storage device (eg, 13-2), there is always an example of the active storage device so that it can always operate as the active storage device. For this purpose, the information to be received in the current storage device 13-1 of the current IJlym device (for example, 12-1) is simultaneously written to the installed storage device 13-2 in parallel, and the information is always written in both storage devices 13-1 and 13-2. Stores the same information. Note that reading of stored information is carried out independently by the current processing device 12-1 from the current storage device 13-1, and by the backup processing device 12-2 from the backup storage device 13-2. As a result, even if the current storage device 11113-1 becomes unusable at any time, the spare storage device 13-2 can immediately continue operating as the current storage device. However, if the current processing device 12-1 becomes abnormal and writes incorrect information to the current storage device 13-1, the same erroneous information will be written to the backup storage device 13-2 at the same time. ), if the current processing equipment [12
Even if the preprocessing device 12-2 is operated in place of -1, normal information cannot be obtained, so the exchange connection operation cannot be continued. As a countermeasure, a magnetic chip is used as an information storage file in the remote line concentrator 1! The preprocessing device 12-2 reads out wholesale storage information from the spare storage device 13 at a predetermined period and records it in the magnetic tape device 17 via the magnetic tape control device 16, as described above. If the information stored in the current and backup storage devices 13-1 and 13-2 are both destroyed, by writing the latest information recorded in the magnetic chip 7"[17], It is also a consideration to restore the information in the current and spare storage devices 13-1 and 13-2 to a state prior to the predetermined cycle. However, the installation of such a magnetic tape device 17 and magnetic tape control device 17 does not result in hindering miniaturization and economicalization of the remote line concentrator 1, and is not necessarily a desirable solution.゛As is clear from the above explanation, according to the conventional remote information storage system, the magnetic tape device 17 and the magnetic tape control device 16 cannot be installed in the remote line concentrator 1, and the remote line concentrator 1 can be downsized and Therefore, if the installation of the magnetic tape device 17 and the magnetic tape control device 16 is abandoned, the current and spare storage devices 13
If the information stored in -1 and 13-2 are both destroyed, all ongoing calls will be interrupted and the exchange service will be significantly degraded if operation is started from the initial state.

The purpose of the present invention is to eliminate the drawbacks of conventional remote information storage methods as described above, and to store information in a storage device without hindering the miniaturization and evacuation of remote line concentrators. The aim is to rescue ongoing calls as much as possible when information is destroyed.

For this purpose, a remote concentrator having a working and preprocessing unit and a working and spare storage unit is connected to the master exchange 1f! e
In an exchange system in which exchange control information is exchanged via working and standby communication links provided between This is achieved by reading out the information stored in the spare storage device at a predetermined period and transferring it to the four master exchanges via the preliminary communication link, and recording the stored information received by the master exchange in a storage file. Hereinafter, one embodiment of the present invention will be explained with reference to FIG. Second
The figure is a diagram illustrating a remote information storage method according to an embodiment of the present invention. Note that the same code indicates the same object throughout the town. In FIG. 2 as well as in FIG. 12-1 is a communication control device 14
-1, Digital trunk 15-1, Working communication link 3
-1, the central processing unit 22 of the master exchange -2 via the digital trunk 25-1 and the communication control device 26-1.
Control information and control response information are exchanged between the controller and the controller. , On the other hand, the preliminary processing device 12-2 reads out the information stored in the preliminary storage device 13-2 at a predetermined period, and stores the communication control device 14-2, digital trunk 15-2, It is transmitted to the communication link 3-2, the digital trunk 25-2, and the communication system processing device 22. The central processing unit 22 temporarily stores the received storage information in the main memory [2].
3 is recorded on the magnetic tape device 28 provided in the master exchange 2 via the magnetic tape control device 27. As described above, the information stored in the spare storage device 13-2 in the remote line concentrator 1 is recorded and saved in the magnetic tape device 928 of the master exchange 2 at the predetermined period. In such a state, if the stored information in the storage, current, and spare storage devices 13-1 and 13-2 is destroyed, the processing device 12-1 # is in an abnormal state. 12
-2 requests the central processing unit 22 of the master exchange 2 to transfer the latest stored information. The central processing unit 22 transmits the latest stored information recorded on the magnetic tape device @28 to the communication control device 26-2, the digital trunk 25-2, the backup communication link 3-2, the digital trunk 15-2, and the communication control device 14. -2 to the preprocessing device 12-2 of the remote line concentrator 1. The preprocessing unit 12-2 stores the stored information received by 13-1 and 13-2 in parallel into the current and backup storage units. As a result, the information stored in the current and backup storage devices 13-1 and 13-2,
Even if it is old, it is restored to the state before the predetermined period. Therefore, the backup processing unit [12-2, which is newly activated as the current one, can perform relief processing for the ongoing call based on the restored stored information.

As is clear from the above description, according to this embodiment, the information stored in the active and spare storage devices 13-1 and 13-2 of the remote concentrator [1] is sent to the main exchange 2 at a predetermined period. When the data is stored in the magnetic tape device 28 provided, the data is stored in the remote line concentrator 1 with the magnetic tape device 1
It becomes possible to restore the stored information without installing a computer such as 7 (FIG. 1). In addition, in the master exchange 2, in order to centrally store stored information transferred from a plurality of remote line concentrators, the number of magnetic tape devices 28- and magnetic tape Stl@ devices 127 to be installed is limited to each remote line. It would be more economical to install it for each scissor #1 or to consider sharing it with a magnetic tape device for storing exchange control information.

Furthermore, since the stored information is transferred by the preprocessing device [12-2] via the preparatory communication link 3-2, etc., there is no risk of interfering with the operation of the remote concentrator 1; If the normality of the functions of the backup communication link 3-2 and the like is periodically confirmed, reliability is further improved.

Note that the second embodiment is only one embodiment of the present invention, and the configuration of the remote line concentrator 1 is not limited to that shown in the figure, and many other modifications may be considered. , the effect of the present invention does not change even in the case of falling down.

As described above, according to the present invention, the information stored in the storage device can be saved in the exchange system without hindering the miniaturization and economicalization of the remote line concentrator, and even if the stored information is destroyed, it can be continued. Call relief processing is possible, and the service of the switching system is improved. The reliability of the switching system is further improved because the normality of the standby communication link is also periodically checked.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a conventional remote information storage method, and FIG. 2 is a diagram showing an example of a remote information storage method according to an embodiment of the present invention.
2 is a remote concentrator, 2 is a master station exchange 7. 3-1 is a working communication link, 3-2 is a backup communication link, 11 is a remote network, 12-1 is a current processing unit, 12-2 is a backup processing unit, 13 -1 is the current storage device, 13-2 is the spare storage device,
14-i, 14-2゜26-1 and 26-2 are communication control devices, 15-1.15-2.25-1 and 25-2
1 is a digital trunk, 16 and 27 are magnetic tape control devices, 17 and 28 are magnetic tape devices, 21 is a network, 22 is a central processing unit, and 23 is a main storage device. 24 indicates a signal distribution device.

Claims (1)

[Claims] ``In a switching system in which a remote line concentrator having a current and backup processing device and a current and backup storage device exchanges exchange control information via a current and backup communication link provided between a master exchange and a master exchange, the current processing device writes the same information to the current and backup storage devices in parallel;
The preprocessing device reads the information stored in the preparatory storage device in a predetermined number of times and transmits the information to the master station via the preparatory communication link.
! ! A remote information storage method characterized in that the stored information received by the master exchange is stored in a storage file.