JPS60180355A - Redundancy/waiting system of communication controller applied to data exchange - Google Patents

Abstract

PURPOSE:To attain the operation of a spare communication controller even at a fault of a central processing system device when only the communication controller is used in the single system by providing a circuit duplicating bus interfaces of the identical form and designating an execution start address of the switch control of the system. CONSTITUTION:The communication controller (CCU)308 has IF sections 201, 213 of the duplicated identical specifications, and consists of a 1F control section 203, a register group 202, a program control section 205, an address converting section 207 and a route control section 204 having an address set circuit to designate the switching of a route and a program execution start address at switching to a standby system. If one of CCU308-1-308-n is faulty, the central processing unit starts a spare CCU308-0 in place of the faulty CCU so as to attain communication. If the central processing unit 301 is faulty, the bus of the CCU is switched into the standby system, the spare CCU starts and exchange processing program automatically from the address designated by the said address setting circuit and is operated as a high-order device of the active CCU.

Description

[Detailed description of the invention] The present invention is a redundancy/standby system for data exchange equipment.

In particular, the present invention relates to a redundancy/standby system for a communication control device bus-coupled to various devices of a data exchange and a line connection section.

Conventionally, in data exchanges, the first measure against failure of central processing system devices such as the central control unit and main memory is
As shown in the figure, central control units 101, 101', main storage devices 102, 102', data channels 103, 103
', accumulation control device 104°104', accumulation device 105,
105' and channel interface Uniso MD7,
107' and further communication control devices 108-1 to 108-1.
108-n and the interface sections of line connection sections 110-1 to 110-m are provided in duplicate. Due to this.

When a failure occurs in the central processing unit, the failure monitoring circuit 10
In step 6, determine which thread is at fault.

The typical method used is to switch to a yarn that has not experienced a problem and perform the replacement process, but this method has the drawbacks of requiring a very large hardware configuration and the complexity of the software used to control it. Ta. Also, as another conventional example.

As shown in Figure 2, only the communication control device has a redundant configuration.

If any of the current communication control devices 108-1 to 108-n becomes a failure, there is a method of automatically transferring processing to the standby communication control device 1os-o using a program. But with this method.

Although the hardware is smaller, it has the disadvantage that if a failure occurs in the central processing system, communication between the two becomes completely impossible.

An object of the present invention is to make the bus interface formats of the upper and lower devices of two communication control devices the same, to make the interface portion redundant, and to make it possible to connect another communication control device to the lower level of the two communication control devices. By providing the communication control device with a circuit that specifies the program execution start address when the thread is switched, if only two communication control devices are used in a single system with an N+1 redundant configuration, even in the event of a failure of the central processing system, According to the present invention, the standby communication control device is operated as a standby system for the central processing unit to guarantee the data exchange function of at least one line. In a communication control device that is located between a device and a line connection unit that monitors line status and controls a data transmission procedure via a bus, The bus interface format is the same and each is duplicated, and the communication control device is equipped with a circuit for setting the program execution start address when the bus is switched to the standby system, and the data exchange processing is executed as a program when the standby system is executed. By storing the program, in addition to using the communication control device in a duplex configuration, only one communication control device can be switched to a single system with a redundant configuration of N+1 ('N is a positive integer greater than or equal to 1). .

Redundancy of a communication control device applied to a data exchange system, characterized in that in the event of a failure of the central processing unit, the spare communication control device prepared as the redundant configuration is operated as a simple standby system for the central processing unit. A standby method is obtained.

Next, two embodiments of a redundancy/standby system for a data exchange according to the present invention will be described with reference to one drawing.

FIG. 6 is a block diagram showing the configuration of a communication control unit (abbreviated as CCU) used as an embodiment of the present invention. In the figure, CCU C, redundant bus interface section 2-01-0.201-1.213-
D, 213-1, and the specifications of the two interface sections are the same. The 5YNC and TSL signals passing through the interface sections 213-0 and 213-1 represent a synchronization signal and a time slot signal by which the CCUs connected to the bus operate in synchronization. This CCU is.

An interface control unit 2o3 which controls the data on the DATA line by the CNT, N and STB signals.Register group 202 which temporarily stores data between the interface unit and the internal bus. A program control unit 205 that performs communication control processing using program data stored in the main storage unit. An address conversion unit 207 that performs address conversion during memory read/write of the main storage unit, a command from a higher level, or a C
A route control unit 2 has a program execution start address setting circuit for switching the route thread using a route changeover switch 214 in the CU, and for specifying a program execution start address when one switch is switched to a standby system.
049 line connection unit (abbreviated as TJA). Resinuta group 2o9
CNT by the control information stored in the line control memory unit 2101 and line control memory 210 that stores control information and input/output data for the LA.

11i, interface control unit 2 that controls STB signals
11 and a time slot control section 212 that controls the LA scan timing using the 5YNC and TSL signals from the bus control section.

FIG. 4 shows the relationship between the interfaces between the CCU configured as described above, the two-channel interface unit (abbreviated as CIU), and the LA. In this figure, 308 is a CCU.

307 is a channel interface section (abbreviated as c+To)
, and 610 systematically indicate LA. CI [J307 and CCU 308 questions and ccU 3
08 and 1. Data transfer between A310s.

It is controlled by CNT, IN and STB signals sent from the host device. CI L? , -CCU (CCU
- LA), CCU (or L
A) is (!CN sent from IU (or CCU)
The type of data is identified by the T signal, and if IN=1, the specified data is sent onto the DATA bus in synchronization with the STB signal, and if IN=0, the data is sent out on the DATA bus in synchronization with the STB signal.
Launch data from the CIU (or CC!U) on the TA bus. Data transfer between the CCU and LA is synchronized by the 5YNC and T+sL signals sent from the bus control unit 309 to prevent contention on the bus.

The CCU 308 uses the bus to access the LA 3 only when the time slot number set in the CCU and the number of calls counted from the 5YNC signal to the TSL signal match.
Data transfer with 10 is performed. This Cl:U-CCU-L
An example of data transfer between nodes A and C is shown in FIG.

FIG. 6 is a time chart showing an example of signals sent between the CIU 307 and the CCU 3O8. Data is 8 bits (parity 1 pinto is added), C
The NT signal has 6 binos 1 to 6, and as seen in the data format of FIG. 7, the contents are differentiated corresponding to i'''-, "0", or "1pa" of the IN signal. Further, FIG. 8 is a time chart showing an example of signals sent between the CCU 308 and the LA 310.

As a result, the data synchronized for each time slot and the ON and T signals are shown corresponding to the IN signal's 0' or 1'', respectively, as seen in the data format of FIG. There is.

FIG. 10 shows the present invention (to which the CCU in FIG. 6 is applied).
This is a block diagram showing the configuration of an embodiment according to λ. Data channel 606. Accumulation control device 304. Accumulator 605
Only one set of channel interface unit 307 is installed, and DCU 308-0-308-n is Cl
The bus interface format is the same for U307 and LA 3'10-1 to 310-n, and each of them is connected in a duplex manner. However, a backup CC as a redundant configuration
The standby system of the LA side interface section of U308-0 is cc
U 308-1 to CIU side Ifin of ro 08-n, 3
09.309' is a bus control unit, 311-1 to 311-
n indicates a data terminal. According to such a configuration, if any of the CCUs 308-1 to 308-n becomes a failure, the central processing unit
It is possible to activate the spare CCU 108-0 instead of the cU and perform communication.

Also, if the central processing unit becomes a failure.

The CCU bus is switched to the standby system, and the spare CCU 3
0'8-0 automatically starts the stored exchange processing program from the address indicated by the program execution start address setting circuit.

As a host device of the current CCUs 308-j to 308-n, it performs signal processing and data exchange processing between each CCU.

FIG. 11 is an example showing the rescue process when the central processing unit becomes a failure, and the ccu 308-0 has a 20'CU address (≠1 to 4l) stored in the line control memory 210 instead of the LA address. -N); from the second,
The CCUs 308-1 to 308-n are scanned.

LA 310-1 sets an input transfer request in response to a call originating from data terminal 311-1. When CC1U308-'O detects an input transfer request by scanning, it issues OC! U3'08
Input data is received sequentially from -1. The CCU 308-0 processes the input signal and activates the COU 308-n corresponding to the corresponding receiving data terminal.

The ccU 308-n sends an output transfer request as a CCU response upon activation from the ccU 308-0.

When the cco 308-0 detects an output transfer request by scanning, it sequentially transfers the data to the CCU 308-n.

When cctJ308-n receives data.

Data is transferred to data terminal 311-n via LA 310-n. In this way, CCU 308-0
CU 308-1~. It can be used as a standby system for the 308-n and at the same time as a simple standby system for the central processing unit.

In addition, as a means of switching to the standby system in the event of a failure in the central processing unit, the central processing unit sends a failure check signal to the CIO at regular intervals, and the CIU always
monitors the time β-segment of the fault check signal. and,
A method for the CIU to automatically issue a CCU system switching instruction (command) by detecting a timeout when the failure check signal is stopped when a failure occurs in the central processing unit;
There are methods such as manually switching the route redirection switch mounted on the CCU.

As is clear from the above explanation, according to the present invention, 1
The communication control device's third-level device and lower-level device have the same bus interface format, making the interface section redundant.
Enables connection of other communication control devices below the communication control device.

In addition, by providing the communication control device with a circuit that specifies the execution start number l of the progera fear when the system is switched,
Not only can the spare communication control device be used as a relief device in the event of a failure, but it can also be used as a standby system even in the event of a failure of the central processing unit, which greatly improves system reliability and economic efficiency. The effect obtained at points is a dog.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing four examples of a redundant configuration of a conventional data exchange, FIG. 2 is a block diagram showing an example in which only the communication control device of a conventional data exchange has a redundant configuration, and FIG. 5 is an embodiment of the present invention. A block diagram showing the configuration of a communication control device used as
FIG. 5 is a diagram showing the relationship of the interface between A and A.
FIG. 6 is a diagram showing an example of data transfer between the CXU and the CCU and LA in FIG. A time chart in FIG. 7 showing an example of signals sent between CfU and the CCU in FIG. 8
The figure is a time chart showing an example of signals sent between the CCU and LA in Figure 6, and Figure 9 is a time chart showing an example of signals sent between the CCU in Figure 5 and the LA.
and LA, the first form of the data sent between
Figure 0 is. FIG. 11 is a block diagram showing the configuration of an embodiment according to the present invention when the CCU of FIG. 6 is applied. 10 is a block diagram for explaining the operation when the central processing unit in the embodiment of FIG. 10 becomes a failure; FIG. In the figure, 201-0.201-1 is a bus interface section, 202 is a register group, 203 is an interface control section, and 204 is a route control section. 205 is a program control unit, and 206 is a main storage unit. 207 is an address control unit, 208 is a scan control unit, 2
09 is a register group, 210 is a line control memory section, 211
is the interface control section. 212 is a time slot control unit; 213. -0°213
-1 is a bus interface unit, 2114 is a route 1 to changeover switch, and 601 is a central control unit. 602 is a main storage device, 303 is a data channel device, 6
04 is a storage control device, 3Q5 is a storage device, and 307 is a channel interface unit. 31] 8-0 to 308-n are communication control devices, 309.
309' is a bus control section, and 310-1 to 610 to n are line connection sections. 311-1 to 311-'n are data terminals. Figure 7 Figure 9

Claims (1)

[Claims] 1 A communication control device that is applied to a data exchanger that exchanges data between data terminal devices, is located between a central processing unit and a line connection unit that monitors line status, and controls data transmission procedures via a bus. The bus interface format for the central processing unit and the line connection unit of the communication control device is the same and duplexed, and the communication control device has a program execution start address when the bus is switched to the standby system. By providing a setting circuit and storing a program for data exchange processing as a program when executing the standby system, only 29 communication control devices can be used in N+1(
By switching to a redundant configuration (N is a positive integer of 1 or more) (-by-overlapping system), in the event of a failure of the central processing unit, the spare communication control unit prepared as the redundant configuration can be used as a simple redundant configuration of the central processing unit. A redundancy/standby system for a communication control device applied to a data exchange characterized in that it operates as a standby system.