JPH05244260A - Duplicate operating system by switching external storage device - Google Patents

Abstract

PURPOSE:To execute the transfer of operation information between an active (ACT) system and a standby (SBY) system through changeover of an external storage device in common between duplicate systems with respect to an exchange control system adopting duplicate configuration to warrant uninterruptible operation. CONSTITUTION:The system is provided with the ACT 1, the SBY 2, an external storage device 3 having an area used to store data requiring common share between the systems 1, 2, and a changeover switch 4 switching the connection system of the external storage device 3 and the active system 1 gives a command of transfer data and write to the external storage device 3. The SBY system 2 implements connection monitor of the external storage device 3. When the transfer of information to the SBY system 2 is required, after the content is written to the external storage device 3, the SBY system 2 is selected and when the SBY system 2 detects the connection, the state in the system 2 and the processing command in the external storage device 3 are analyzed to decide and execute the processing and the executed result is described in the external storage device 3. The ACT system 1 reads the information required for its system 1 from the external storage device 3 after a prescribed timing to acquire the information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a redundant operation system by switching an external storage device of a control system in a switching system having a redundant structure for guaranteeing uninterrupted operation. With the expansion of telephone communication services in recent years, it has become necessary to apply various new services to existing exchanges. For example, it has become necessary to provide a telephone service, such as an NCC service, which was directly provided by a conventional NTT telephone exchange station, to a new telephone exchange station via the NTT telephone exchange station.

FIG. 4 shows an example of a system configuration for providing these new services. In the figure, 31 is an XB exchange and 32 is an NCC.
An exchange, 33 is an NTT exchange, 34 is a control device for an XB exchange, 35 is a network, 36 is a billing device, and 37 is a subscriber terminal. In the existing XB exchange 31, ordinary telephone connection services are provided via the NTT exchange 33 according to the called number, and the charging information of the calling subscriber terminal 37 is charged by the charging device 36 connected to the network 31. It was done. However, in the case of services such as NCC exchange 32, NCC exchange 32
In order to record the billing information, it is necessary to notify the subscriber connection information from the XB exchange 31. The transfer function of these subscriber connection information is provided in the current electronic exchange station, but the transfer function is not provided in the existing XB exchange station. Therefore, there is an inconvenience that they cannot subscribe to these new services.

Therefore, the control unit 34 of the existing XB switching center 31
In addition to the conventional control for subscriber connection, a special number control device 38 and a special number trunk 39 for transferring the subscriber connection information have been required. Control device for this special number 38
Stores the subscriber information of the new service in the memory, and in the case of a connection service to the NCC exchange 32, etc., it stores the telephone numbers of the caller and the callee, and stores this in the NCC exchange 32.
It is necessary to transfer the billing information to the NCC exchange 32 and aggregate the billing information. It is necessary to add a control device for providing this new service to the existing XB switching center 31, and it has become necessary to accurately and economically perform subscriber connection information in the current and standby duplex operation.

[0004]

2. Description of the Related Art FIG. 5 shows a block diagram of a non-disruptive duplex system according to the prior art. In the figure, 21 is an active system (AC
T), 22 is a standby system (SBY), 23 and 24 are interprocessor communication devices (IBCH), and 25 is a tightly coupled line. ACT system 21
There is a dedicated intersystem interface IBCH 23, 24 for transferring the operation information between the SBY system 22 and the SBY system 22 through the tightly coupled line 25. This IBCH controls an XB exchange and adds AXS (Advanced XB Swi
tching) and the electronic exchange system B30 have an interface function for transferring information between the ACT system and the SBY system.

The ACT system 21 and the SBY system 22 of this system each have a CPU and a memory, and the subscriber information is always tightly coupled by the inter-bus channels IBCH 23 and 24 and stored in the respective memories. And SBY system are switched immediately to guarantee uninterrupted operation. Further, the service subscriber change data is constantly transferred between the ACT system and the SBY system. In this method, when a failure occurs in the SBY system, the effect of the failure may spread to the ACT system via the tightly coupled line. This is due to a power failure or the like, and noise or the like may be mixed in the inter-system transfer data.

[0006]

The prior art requires a dedicated inter-system interface device and a control device (program), which makes the device configuration and program complicated and expensive. Further, there is a problem that the operation of the operating system is affected by the influence of the backup system failure and the operation of the operating system is interrupted.

In order to solve the above-mentioned conventional problems, the present invention provides a common external storage device and a switching device, and transfers the operation information between the ACT system and the SBY system to the common external storage device between the duplicated systems. The purpose is to do.

[0008]

FIG. 1 is a block diagram showing the principle of the present invention. In the figure, 1 is an active system (ACT system), 2 is a standby system (SBY system), 3 is an external storage device (HDK), 4
Indicates a changeover switch (SW). The external storage device 3 has an area for storing data that needs to be shared between the systems, and a changeover switch 4 for switching the connection system of the external storage device is provided. The changeover switch 4 can switch the connection system to the SBY system 2 under the control of the ACT system 1.

[0009]

[Operation] Information transfer between systems and operation synchronization are achieved by the following procedure. (1) The ACT system 1 instructs and writes the transfer data to the external storage device 3 via the changeover switch 4, and the SBY system 2 monitors the connection of the external storage device 3. (2) In the ACT system 1, when the operation data is updated, the SBY system 2 is instructed to process, the SBY system 2 is inquired, etc.
When information transfer to the Y system 2 is required, the contents are written in the external storage device 3 and then the external storage device 3 is switched to the SBY system 2 by the changeover switch 4. (3) In the SBY system 2, the connection state of the external storage device 3 is constantly monitored, and when the connection is detected, the state of the own system 2 and the processing instruction in the external storage device 3 are analyzed to determine the processing, The result is executed and the executed result is written in the external storage device 3. (4) In ACT system 1, after a certain timing or SBY
The external storage device 3 is switched to the own system 1 by the changeover switch 4 in response to a completion signal from the system, and the necessary information is stored in the external storage device 3.
Read from and get from. The standby system 2 continuously monitors the connection state of the external storage device 3.

[0010]

FIG. 2 shows a connection configuration diagram of an embodiment of the present invention.
In the figure, 11 is an XB switch, 12 is an XB switch controller (MKR), 13 is a special number + ID + partner number sending device (EI).
D) and 14 are computerized trunks (RSTR with ID sending function)
K), 15 is an electromagnetic scanning device (SCN), 16 is an electromagnetic driving device (DRV), 17 is a central control unit (CPU), 18 is a hard disk (DK), and 19 is a subscriber terminal (TEL). Here, the ID is the telephone number of the calling subscriber and is N
Used for collecting billing information in CC etc.

The sender ID of the subscriber terminal 19 is 045-473-1234
The special number 0077 is used to send the other party's number 06-4 via the 2nd Denden.
When connecting to 81-9876, control unit 12 of XB exchange 11
The EID device 13 is captured by the CPU 17, the subscriber data of the DK 18 is confirmed by the CPU 17, and the new telephone exchange station NCC is connected from the RSTRK 14 and the special number + ID + party number = 0077-045-4.
73-1234-06-481-9876 is sent, the connection service by the second electric power line is received, and the charging information is stored in the charging device of the new electric switching station.

The CPU 17 of EID13 is the ACT of # 0 and # 1.
System and SBY system CPUs of dual system are duplicated, and subscriber data of hard disk DK18 is switched and used. A flow chart of the system switching process is shown in FIG. Figure 3
3A shows a state at the time of regular system switching, and FIG. 3B shows a state at the time of fault system switching.

Periodic system switching should be performed before starting system switching.
Perform "data transfer" and "check standby system status" via 18. This is to execute the operation with the latest subscriber / station data after the system switching and to confirm the state of the standby system and guarantee the restart of the memory after the system switching. Note that the SBY system (CC # 1) represents a spare system that is not the ACT system (CC # 0), and the SBY system restarts the memory at the time of startup. In FIG. 3 (a), (1) Whether or not system switching can be performed is determined by determining the cause of suspension in CC # 0 of the ACT system. If system switching is not possible, system switching is suspended. (2) If system switchover is possible, save the inherited data to DK and switch DK. If a DK failure occurs during data saving, the regular switching is stopped. (3) The device status is displayed on the CC # 1 of the SBY system, the takeover data of the subscriber or the station is loaded into the DK, and the processing completion is written in the DK. (4) In CC # 0, switch the DK to its own system after the timing, judge whether it is possible to carry out the system switching written in the SBY system in the DK, and if system switching is not possible, system switching will be stopped, but system switching will be performed. If possible, CC # 1 is used as the ACT system to perform system switching, and call processing operation is started. CC
# 0 becomes an SBY system and monitors the DK state.

Next, the switching of the failure system is automatically restarted by the new ACT system, and then automatically the "system switching cause" of the failure occurrence system via DK.
And "diagnosis result" are collected and the failure information is displayed. Figure 3
In (b), (11) When a failure occurs in CC # 0 of the ACT system,
Switch CC # 1 of SBY system to ACT system, CC # of DK
Switch to 1. (12) Load subscriber / station data from DK switched to CC # 1. (13) CC the DK to activate the SBY fault processing
Switch to # 0. (14) In CC # 0, perform self-diagnosis, display the diagnosis result, save failure information (TM save) on main memory and system switching cause, and load system, subscriber data and other data from DK .. (15) After timing, switch DK to CC # 1, collect the cause of system switchover, create a message, and set CC as a standby system.
The state of # 0 is managed and the diagnosis result is displayed.

[0015]

EFFECTS OF THE INVENTION As in the prior art, transfer of information required for duplex operation without having a dedicated device or interface,
Synchronous operation becomes possible. As the external storage device, one used in normal operation can be used. Further, since the systems are completely separated from each other, there is no possibility of being affected by the failure of the partner system, and thus the reliability is high.

[Brief description of drawings]

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

FIG. 2 is a connection configuration diagram of an embodiment.

FIG. 3 is a processing flowchart of an embodiment.

[Fig. 4] System configuration example of new service provision

FIG. 5 is a configuration diagram of a duplex system of a conventional example.

[Explanation of symbols]

 1 Working system (ACT system) 2 Standby system (SBY system) 3 External storage device (HDK) 4 Changeover switch (SW) 11 XB switch 12 XB switch control device (MKR) 13 Special number + ID + partner number sending device (EID) 14 ID Electronic trunk with sending function (RSTRK) 15 Electromagnetic scanning device (SCN) 16 Electromagnetic driving device (DRV) 17 Central control unit (CPU) 18 Hard disk (DK) 19 Subscriber terminal (TEL) 21 Working system (ACT) 22 Standby system (SBY) 23, 24 Interprocessor communication device (IBCH) 25 Tightly coupled line 31 XB switching center 32 NCC switching center 33 NTT switching center 34 XB switching center control device 35 Network 36 Billing device 37 Subscriber terminal 38 Special number Control device 39 Special number relay trunk

Front Page Continuation (72) Inventor Mizutani ▲ Taka ▼ 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa, Fujitsu Limited (72) Inventor Kazunori Arai 1015, Kamedotachu, Nakahara-ku, Kawasaki, Kanagawa Prefecture, Fujitsu Limited (72) ) Inventor Yasuyuki Horie 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation

Claims (1)

[Claims] 1. A control system of a switching system adopting a duplex configuration for guaranteeing uninterrupted operation, including an ACT (active) system (1) and an SBY (spare) system (2).
And an external storage device (3) having an area for storing data that needs to be shared between the ACT system (1) and the SBY system (2), and a connection system of the external storage device (3) is an ACT system. A changeover switch (4) that is switched by control from (1) is provided, and in the ACT system (1), transfer data is instructed and written to the external storage device (3) via the changeover switch (4), and S
The BY system (2) monitors the connection state with the external storage device (3), and the ACT system (1) writes the content to the external storage device (3) when information needs to be transferred to the SBY system (2). When the external storage device (3) is switched by the changeover switch (4) to the SBY system (2) and the connection is detected in the SBY system (2), the state of the own system (2) and the external storage device (3) The processing instruction is analyzed to determine and execute the processing, and the execution result is entered in the external storage device (3), and the ACT system (1)
Then after a certain timing, the external storage device (3) is connected to its own system (1).
A redundant operation method by switching to an external storage device, which is characterized in that necessary information is read from the external storage device (3) by switching to a changeover switch (4).