JPH0685883A - Information communication system - Google Patents

Abstract

PURPOSE:To obtain the information communication system in which a fault location is disconnected through system changeover even when a fault takes place in system components in duplicate at a host, the processing takes over and communication data are warranted so as not to give hindrance with a terminal equipment. CONSTITUTION:A main storage device 102 of a host computer is provided with communication control interface areas 200-209 used for starting communication processing to a multi-line communication controller, configuration control interface areas 220, 221 implementing system changeover processing of a duplicate communication interface section, and recovery interface areas 210-212 making information takeover between the duplicate communication interface sections at system changeover. Then the communication interface section 103 is provided with a system changeover processing means making processing takeover according to takeover information of the recovery interface areas 210 212 in the main storage device 102. Thus, it is prevented that the user cannot use the data communication system for a prescribed period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information communication system for providing an information service in which information is transmitted from a host computer to a plurality of terminals in real time, and particularly, communication control hardware of the host computer is duplicated. The present invention relates to system switching control in consideration of guarantee of continuity of communication data when they are operated in the form of an active system and a standby system.

[0002]

2. Description of the Related Art Conventionally, as a technique for guaranteeing communication data continuity when switching from an active system to a standby system in a duplex system, there is one disclosed in Japanese Patent Laid-Open No. 63-61339. In this technology, data to perform inter-system link from the active system to the standby system (reception data, transmission data, transmission (Waiting address, etc.) is transferred, and after the transfer of these data is completed, the system is switched. In this way, when the system is switched, the continuity of the communication data is guaranteed by taking over the information of the transmission data from the active system to the standby system.

[0003]

The above prior art has realized the guarantee of the continuity of communication data when the system is manually switched from the active system to the standby system. However, when a failure occurs in the active system, it is not always possible to transfer information for performing intersystem link to the standby system, and it is not applicable when a failure occurs in the active system and system switching is performed. There was a problem.

Further, the above-mentioned prior art is for guaranteeing the continuity of the communication data transmitted from the host computer to the terminal, and regarding the point of guaranteeing the continuity of the communication data transmitted from the terminal to the host computer. Was not considered. Therefore, if a failure occurs in one of the duplicated components inside the host computer, the communication data transmitted from the terminal by the system user will be lost although the host computer can continue to operate. There was a problem.

It is an object of the present invention that, in a host-side component of an information communication system centering on a host computer, a failure occurs in the active system of the redundant part, and the redundant part is transferred from the active system to the standby system. Even when switching to, the data is exchanged between the terminal and the host computer both by transmission from the host computer to the terminal and by reception from the terminal to the host computer without mutually confirming the data communication state before the failure. It is to guarantee the continuity of communication data.

Another object of the present invention is to provide a one-to-one communication in which a host computer sends and receives data to and from one terminal as a data communication service to and from a terminal, and to send the same data to a plurality of terminals at a time. Even in an information communication system that processes both multicast communications in a mixed manner, it is possible to ensure the continuity of communication data of both communication services at the time of system switching due to the occurrence of the active system failure in the duplicated part.

Still another object of the present invention is to detect a fault in the active system of the duplicated part and to switch the system in accordance therewith in a short time that the user of the information communication system cannot recognize.

[0008]

In order to achieve the above object, the present invention provides a multi-line communication which has a plurality of line control modules for performing line control under a host computer and processes line control of a plurality of lines in parallel. Provide a control device. The host computer is a CPU (central control unit),
The main storage unit and the communication interface unit having an interface channel which is a connection port with the multi-line communication control device have the followings, respectively.

A communication control interface area having a communication control interface table for data communication processing such as one-to-one communication and multicast communication in the main memory of the host computer as a control interface between the CPU of the host computer and the communication interface section. When,
A configuration control interface area that has a configuration control interface table for system switching of the redundant communication interface unit and configuration change processing of the multi-line communication control device, and communication for ensuring continuity of communication data when switching the system of the redundant communication interface unit A recovery interface area having a recovery interface table used for exchanging process progress takeover information is independently provided.

The CPU of the host computer is provided with an interface channel connect / disconnect command for instructing system switching of the duplex communication interface section via the configuration control interface area.

The CPU of the host computer is provided with a destination pattern table setting command for setting the destination pattern table indicating the data transmission destination line in the multicast communication in the communication interface unit via the communication control interface area.

Further, a multicast communication management table is provided in the communication control interface area for recording management information in the multicast communication processing in the communication interface section.

Furthermore, in the recovery interface area, there is a current write pointer table for recording the one-to-one communication for each line of each line control module of the multi-line communication control device, a data transmission start state in multicast communication, and communication. A next read pointer table for recording the activation status from the CPU in the control interface,
And a destination pattern table storage area for storing the destination pattern table notified by the destination pattern table setting command.

[0014]

The above means operates as follows in the communication processing through the communication control interface area.

The communication interface section records a value indicating that it is being received in the corresponding element of the next read pointer table in the recovery interface area when receiving data communication activation such as one-to-one communication or multicast communication from the CPU of the host computer. , At the time of starting data transmission to the line control module, a value indicating the presence or absence of starting is recorded in the corresponding element of the current write pointer table. Further, during the multicast communication activation acceptance process, the data transmission activation status to each line indicated in the destination pattern table is recorded in the multicast communication management table in the communication control interface area as needed. When receiving the destination pattern table setting command, the destination pattern table is not only loaded into the communication interface unit but also set in the destination pattern table storage area on the recovery interface area.

Further, the above means operates as follows in the system switching processing of the duplex communication interface section via the configuration control interface area.

The CPU of the host computer manages one of the duplex communication interface units as an active system (master state) and the other as a standby system (slave state). The state is managed based on the state of the interface channel to which the multi-line communication control device is connected. The master state is a state in which there is at least one reserved interface channel in the communication interface section, and the slave state is There is no reserved interface channel in the communication interface block. Here, the state of the interface channel is the reserved state of the interface channel of the communication interface unit logically connected to the internal bus by the internal bus control unit of the multi-line communication control device, and the internal bus control unit is the logical state. The state of the interface channel of the communication interface section, which is separated from the internal bus, is called the free state. Note that the two internal bus control units on the internal bus of one multi-line communication control device are exclusively controlled in logical connection so that both do not enter into the reserved state. Here, the communication interface unit that has received the interface channel connection / disconnection command from the CPU of the host computer performs logical connection / disconnection between the internal bus control unit and the internal bus of the multi-line communication control device. In this way, the active / standby system switching process of the duplex communication interface unit can be performed using the interface channel connect / disconnect command.

Further, the above means operates as follows via the recovery interface area in the communication interface section which has been switched from the standby system to the active system by the system switching processing of the duplex communication interface section.

First, the destination pattern table in the communication interface unit is restored from the destination pattern table storage area in the recovery interface area on the main storage unit of the host computer, and the currently processed multicast communication management table in the communication control interface area is being processed. Is restored to the multicast communication management table editing area in the communication interface unit, and the multicast communication processing is taken over.

[0020]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of an information communication system according to an embodiment of the present invention and internal structures of a host computer on a host side and a multi-line communication control device.

The information communication system is composed of a host side including a host computer 100 and a multi-line communication control device 105, and terminal groups 111-1 to 111-n connected to the host side via a network 110. One host computer 100 connects a plurality of multi-line communication control devices 105, and the multi-line communication control device 105 accommodates a plurality of lines 109. The host computer 100 is a CP
U101-1 (-101-n), main memory unit A / B 102
-A / b, communication interface unit 103-a (103-
b), internal components such as the computer bus A / B 104-a / b are duplicated, and a fault-tolerant computer capable of continuing operation even if one of them fails. Then, the multi-line communication control device 105 is provided in the communication interface unit 103 of the component.
A plurality of interface channels 117 for connecting to each other are provided, and the interface channels having the same positional relationship in the duplex communication interface unit 103 (for example, 117-a1
And 117-b1), a single multi-line communication control unit 105 is connected to duplicate the connection path between the multi-line communication control unit 105 and the host computer 100.

In the multi-line communication control unit 105, two internal bus control units 106 for controlling the internal bus 108 are connected to the host computer 100 via each interface channel 117 of the duplex communication interface unit 103 and the expansion bus cable 118. It Multi-line communication control device 1
In the inside of 05, the two internal bus control units 106 and a plurality of line control modules 107 are connected to the internal bus 108. Then, the line control of the minority line 109 is performed for each line control module 107, and the multi-line communication control device 105 as a whole controls many lines. In this way, the host computer 100 communicates with the plurality of terminals 111-1 to n via the line 109 and the network 110.

The communication processing in this information communication system is distributed and performed by each of the CPU 101 of the host computer 100, the MPU 112 of the communication interface section 103, and the MPU 113 of the line control module 107. In the communication process, communication data is exchanged via the transmission / reception buffer 114 on the main storage unit 102, the transmission / reception buffer 115 in the communication interface unit 103, and the transmission / reception buffer 116 in the line control module 107. Here, the redundant main storage unit A / B 102-a / b
The access to the transmission / reception buffer 114-a / b will be described by taking the case of the communication interface unit 103 as an example. Communication data (reception data, etc.) from the communication interface unit 103 to the transmission / reception buffer 114 of the main storage unit 102
When transferring data, the communication interface unit 103 uses the duplex computer bus A / B 104-a / b to send / receive buffers 114 of both main storage units A / B 102-a / b.
-Transfer the same data to a / b. In addition, the main storage unit 10
2 transmission / reception buffer 114 to communication interface unit 1
When importing communication data (transmission data etc.) to 03,
The communication interface unit 103 has a main storage unit A / B 102 via a redundant computer bus A / B 104-a / b.
-A / b The same data is received from both transmission / reception buffers 114-a / b by performing a match check. The contents of communication processing in each unit will be described later.

Further, the duplicated communication interface section 103 inside the host computer 100 is managed by the CPU 101 of the host computer 100 with one of them as an active system (master state) and the other as a standby system (slave state). The state is managed based on the state of the interface channel 117 to which the multi-line communication control device 105 is connected. The master state means that the communication interface 103 reserves the interface channel 117.
Is a state in which there is at least one, and the slave state is a state in which there is no reserved interface channel 117 in the communication interface 103. Here, in the state of the interface channel 117, the interface channel 1 of the communication interface 103 in which the internal bus control unit 106 is logically connected to the internal bus 108.
The state of 17 is called a reserve state, and the state of the interface channel 117 of the communication interface unit 103 in which the internal bus control unit 106 is logically disconnected from the internal bus 108 is called a free state. The two internal bus control units 1 on the internal bus 108 of one multi-line communication control device 105
In 06, the logical connection is exclusively controlled so that neither of them becomes the reserved state.

FIG. 2 shows a communication processing interface structure on the host side in the information communication system according to the embodiment of the present invention.

First, the interface between the CPU 101 and the communication interface unit 103 in the host computer 100 will be described.

CPU 101 to communication interface unit 10
The three-way interface is a communication control interface for performing data communication processing such as one-to-one communication for transmitting / receiving data to / from one terminal 111 or multicast communication for transmitting the same data to a plurality of terminals 111-1 to 111-n at a time. ,
There is a configuration control interface for switching the system of the redundant communication interface unit 103 and changing the configuration of the multi-line communication control device. The table used in each interface is placed in each area on the main storage unit 102. In the communication control interface area, the host computer 100
When the CPU 101 starts up to the communication interface unit 103, the boot destination identification queue table 200 for registering information indicating the destination of the boot command, and the one-to-one communication boot for registering the one-to-one communication command requesting data transmission for each line 109 Queue table 201, multicast communication activation table 202 for registering a multicast communication command requesting the same data transmission to a plurality of lines, line control module 107 for registering end information of said one-to-one communication command, one-to-one communication end report queue・ Table 20
3. The communication interface unit 103 registers a multicast communication end report queue table 204 for registering the end information of the multicast communication command, a data reception report queue table 205 for registering data reception information from the terminal 111, and a communication error on the line 109. Communication interrupt report queue table 206 for registering report information in the case of occurrence of the above, and the communication interface unit 103 registers information indicating the report destination at the time of a report interrupt such as the command end or data reception in the CPU 101 of the host computer 100. The interrupt report destination identification queue table 207, and the multicast communication management table 20 used by the communication interface unit 103 to manage the data transmission start processing status to each line when processing the multicast communication command.
8 and the line control module 107 includes a multicast communication activation acceptance completion report queue table 209 for registering information indicating acceptance completion of data transmission activation in the multicast communication processing from the communication interface unit 103. Here, the one-to-one communication activation queue table 201,
The one-to-one communication end report queue table 203, the data reception report queue table 205, the communication interrupt report queue table 206, and the multicast communication start acceptance completion report queue table 209 are all connected below the communication interface unit 103. Is provided for each number of lines accommodated in the multi-line communication control unit 105, and order management of transmission / reception data on each line is performed. Further, a plurality of multicast communication management tables 208 are provided so that the communication interface unit 103 can simultaneously manage a plurality of multicast communication processes. Each table on this communication control interface area is common to the duplicated communication interface unit 103, and only the active communication interface unit 103 can access it. Further, the communication interface unit 103 has the following two areas in relation to the communication control interface. The work area 230 for the destination pattern table is the host computer 10
It is an area for storing a destination pattern table indicating a transmission destination in the multicast communication notified from the CPU 101 of 0 to the communication interface unit 103. The multicast communication management table editing area 231 is an area for creating the multicast communication management table 208 based on the destination pattern table stored in the destination pattern table work area 230. Also,
The multicast communication management table editing area 231 is divided into areas corresponding to the number of faces of the multicast communication management table 208. Here, the communication interface unit 1
In the multicast communication command processing in No. 03, the multicast communication management table editing area 231 is used when searching for a data transmission destination or creating end information for the CPU 101.
The multicast communication management table therein is mainly used, and the multicast communication management table 208 on the communication control interface area is used for the purpose of recording the progress status of the multicast communication processing.

The configuration control interface includes a start message table 220 used by the CPU 101 of the host computer 100 to notify the communication interface unit 103 of a start message of a command such as system switching, and the communication interface unit 103 of the CP of the host computer 100.
There is an end message table 221 used to notify the U101 of an end message such as the command end report.
Here, the start message / end message is provided with a plurality of priority levels to enable priority processing of a specific command, and the start message table 220 and the end message table 221 are provided for each level. Each table on this configuration control interface is provided independently for each duplicated communication interface unit 103.

Next, an interface between the host computer 100 and the multi-line communication control device 105, that is, an interface between the communication interface section 103 and the line control module 107 will be described.

In the interface between the communication interface unit 103 and the line control module 107, the communication interface unit 103 receives the one-to-one communication command from the CPU 101 of the host computer 100 and the corresponding line 1
The one-to-one communication command queue table 240 for registering the one-to-one communication command in the line control module 107 of 09, the communication interface unit 103 receives the multicast communication command from the CPU 101 of the host computer 100, and the line control module of the corresponding line 109 Multicast communication command queue table 24 for registering a multicast communication command in 107
1. When the line control module 107 sends a data transmission processing end report of the one-to-one communication command, a start reception completion report of the multicast communication command, a data reception report from the terminal 111, or a line abnormality occurrence report to the communication interface unit 103. There is an interrupt notification table 242 indicating which of the above reports is issued by the issued interrupt. Here, the multicast communication command queue
To increase the number of multicast communication commands that can be registered in the table 241, a line control module expansion buffer area is provided in the main storage unit 102.

Finally, the duplex communication interface unit 10
A recovery interface for exchanging process progress takeover information for guaranteeing data continuity between the duplex communication interface units 103 at the time of system switching will be described.

In the recovery interface area, the current write pointer table 2 for recording the current data transmission start registration point in the one-to-one communication command queue table 240 and the multicast communication command queue table 241 of each line control module 107.
10. When the communication interface unit 103 accepts activation from the CPU 101 of the host computer 100, in the activation destination identification queue table 200 and the one-to-one communication activation queue table 201 of each line, the activation information acquisition point at the next activation acceptance There is a next read pointer table 211 for recording a destination pattern table and a destination pattern table storage area 212 for storing a destination pattern table.

Next, the structure of the table constituting the above interface will be described with reference to FIGS. 3, 4, 5, and 6.

FIG. 3A shows the structure of the boot destination identification queue table 200 and the interrupt report destination identification queue table 207. In the figure, 301 is a write pointer indicating the position (number) of the information registration area 303 in which information can be registered in this queue table, and 302 is a read indicating the position (number) of the information registration area 303 where information is registered. It is a pointer. Here, the information registration area 30
The number n of 3 is the number of all the lines 109 accommodated in the multi-line communication control device 105 below the communication interface unit 103.
The number is such that data transmission can be activated m times to each.

FIG. 3B shows the one-to-one communication activation queue table 201, the one-to-one communication end report queue table 203, the multicast communication end report queue table 204, the data reception report queue table 205. Communication interruption report queue table 20
6, the multicast communication start acceptance completion report queue
3 shows a structure of a table 209 and the one-to-one communication command queue table 240. 311 in the figure
Is a write pointer indicating the position (number) of the information registration area 313 where information can be registered in the queue table, 31
2 is an information registration area 313 where information is registered
Is a read pointer indicating the position (number) of. here,
The number m of information registration areas 313 is the line control module 1
07 is the number of transmission / reception data buffers that each line 109 has.

FIG. 3 (c) shows the structure of the multicast communication activation table 202. 3 in the figure
Reference numeral 21 is a start flag indicating whether or not valid start information is registered in the information registration area 322 below it. Here, the number l of the information registration areas 322 is the number of faces of the multicast communication management table 208, that is, the number of multicast communications that can be simultaneously processed by the communication interface unit 103, and each information registration area 322 and each multicast communication management table There is a one-to-one correspondence with 208.

FIG. 3D shows the structure of the multicast communication command queue table 241. In the figure, 331 is a write pointer indicating the position (number) of the information registration area 333 in which information can be registered in this queue table, and 332 is the position (number) of the information registration area 333 in which information is registered. This is the read pointer. Here, the number k of the information registration areas 333 is the number that can receive the multicast communication command from the communication interface unit 103 for several seconds even if the quality of the line 109 deteriorates and the throughput of temporary data transmission decreases.

FIG. 3E shows the interrupt notification table 2
42 shows the structure of 42. In the figure, 341 is a valid flag indicating whether valid interrupt information is set in the interrupt notification table 242. 342 to 3
Reference numeral 45 is a flag indicating the type of interrupt notification, 342 is a one-to-one communication end report flag indicating that it is a one-to-one communication command processing end report, and 343 is a communication interrupt report such as a line abnormality occurrence. The communication interruption report flag 344, a data reception report flag indicating that it is a data reception report from the terminal 111, and 345 is a multicast communication activation acceptance completion report flag indicating that it is a multicast communication command activation acceptance completion report. .
Reference numerals 346 to 348 represent interrupt notification sources.
Is a line control module number in the multi-line communication control device 105, 347 is a line number in the line control module 107, and 348 is a terminal number on the line 109.

Here, each of the queue tables (20
0,201,203-207,209,240 and 24
1) is a FIFO (First In First O)
ut) method, and the write pointer and read pointer of each queue table are processed as follows. Write pointer 301 (or 311,331)
And the read pointer 302 (or 312, 332)
Is the first information registration area 303-1 (or 31) next to the n (or m, k) th information registration area 303-n (or 313-m, 333-k) when updating.
3-1 and 333-1). Also,
When updating the write pointer 301 (or 311 and 331), the read pointer 302 (or 312 and
332) indicates the information registration area 303 (or 31)
3, 333) is processed so as not to indicate an area beyond the read pointer 302 (or 312, 332).
To update the write pointer 301 (or 31
1, 331) indicates the information registration area 303 (or 3)
13 and 333) are processed so as not to show the area before.

FIG. 4A shows the structure of the current write pointer table 210. 4 in the figure
Reference numeral 01 is a one-to-one communication recording area for recording the write pointer 311 of the one-to-one communication command queue table 240 of each line control module 107, and 402 is a write pointer of the multicast communication command queue table 241 of each line control module 107. This is a recording area for multicast communication in which 331 is recorded. Here, each recording area is composed of recording fields 403 (404) -1 to n for all the line control modules 107 of the multi-line communication control device 105 connected to the communication interface unit 103, and recording fields for the line control module. 403
(404) is a recording element 405 (406) -1 to m for each line 109 connected to the line control module 107.
Consists of. Therefore, in the current write pointer table 210, the write pointers (311, 33) of the command queue tables (240, 241) are written.
1) is recorded in the corresponding recording element (405, 406).

FIG. 4B shows the structure of the next read pointer table 211. 4 in the figure
Reference numeral 10 is a recording field for a boot destination identification queue table for recording the write pointer 301 of the boot destination identification queue table 200, and 411 is a one-to-one communication for recording the write pointer 311 of the boot queue table 201. This is a recording area for the boot queue table. Here, the one-to-one communication activation queue table recording area 411 includes recording fields 412-1 to 41-n for all the line control modules 107 of the multi-line communication control device 105 connected to the communication interface unit 103.
The line control module recording field 412 is composed of recording elements 413-1 to 41-m for recording the write pointer 311 of the one-to-one communication activation queue table 201 for each line 109 connected to the line control module 107.

FIG. 5A shows the communication interface unit 10.
3 shows the structure of the destination pattern table 500 that is referred to when instructing the line control module 107 to send data in multicast communication. In the figure,
Reference numeral 501 denotes all the line control modules 10 in the all-multi-line communication control device 105 below the communication interface unit 103.
7 is a line control module number representing the numbers sequentially assigned, and 502 is a line number representing the numbers sequentially assigned to the lines 109 accommodated in each line control module 107. In the destination pattern table 500, the necessity of data transmission in the multicast communication process is set to 1, 0 for each line number 502 of each line control module number 501.
It is expressed by the value of. Further, there are a plurality of destination pattern tables 500 so that the combination of a plurality of data transmission destinations can be changed according to the contents of the multicast transmission data.

FIG. 5B shows the structure of the multicast communication management table 208. 5 in the figure
Reference numeral 11 denotes the relevant line control module 10 among the lines 109 for transmitting data during the multicast communication activation process.
7 is the total number of lines 109 that have not registered the multicast communication command and are not yet activated. 512 is
This is an activation management area indicating the necessity of data transmission at the time of multicast communication activation processing for all the lines 109 accommodated in the all-multi-line communication control device 105 below the communication interface unit 103, and its structure is a destination pattern. It is the same as the table 500. A line control module 513 has not yet received from the line control module a completion report of the reception process in response to the start of multicast communication from the communication interface unit 103 among the lines 109 that have registered the multicast communication command in the line control module 107 during the multicast communication start process. Total number not received (per line)
Is the total number of unfinished report receptions. Reference numeral 514 is an end monitoring area for storing that the communication interface unit 103 has received the reception completion report from the line control module 107 for the start of multicast communication, and its structure is the same as that of the destination pattern table 500. . 515 is the total number (in units of lines) of the case where the line control module 107 is not activated due to some abnormality at the time of multicast communication activation, or the reception completion report from the line control module 107 for multicast communication activation is an abnormality report. This is the total number of abnormal terminations. 516-1 to 1, 517-1 to 1, 518-1 to l
Are a line control module number recording field, a line number recording field, and an abnormality type recording field for storing the line control module number which ended abnormally, the line number and the details of the abnormality. 516,5
Items 1 to 1 of 17,518 are registered in the order in which the abnormal end occurs.

FIG. 6A shows the activation message table 22.
The structure of 0 is shown. In the figure, 600 is a valid flag indicating whether or not the startup information is set in the main startup message table 220, and 601 is the main startup message table 2
A boot identification number 602 indicating the priority level of 20 is a boot information setting area for setting boot information.

FIG. 6 (b) shows the structure of the end message table 221. In the figure, 600 is
A valid flag indicating whether or not the end information is set in the final end message table 220, 601 is an end identification number indicating the priority level of the final end message table 220, and 602.
Is an end information setting area for setting end information.

Next, referring to FIG. 7 and FIG. 8, start / run of the configuration control interface and the communication control interface will be described.
The termination processing procedure will be described.

FIG. 7 shows a procedure for starting / terminating the configuration control interface.

First, the start-up processing procedure on the configuration control interface will be described with reference to FIG.

CPU 101 of host computer 100
When instructing the communication interface unit 103 to perform configuration control such as system switching of the redundant communication interface unit 103, the startup message table 220 on the main storage unit 102
Activation information such as a configuration control instruction command is set (1), a communication interrupt is issued to the communication interface unit 103 (2), and a command is activated to the communication interface unit 103. Then, the CP of the host computer 100
The communication interface unit 103, which has received the contact interrupt from the U101, fetches the start information on the start message table 220 (3), then issues a contact interrupt to the CPU 101 of the host computer 100 (4), and the CPU 10
Notify that the start information acquisition from 1 is completed.

FIG. 7B shows a termination processing procedure on the configuration control interface.

The communication interface unit 103, which has completed the processing of the command received by the activation processing, reports the completion to the CPU 101 of the host computer 100. In this case, the communication interface unit 103 sets the end report information in the end message table 221 on the main storage unit 102 (1), and the CP of the host computer 100 is set.
A contact interrupt is issued to U101 (2), and a command end report is sent to the CPU 101 of the host computer 100.
Then, the CPU 101 of the host computer 100 receiving the contact interrupt from the communication interface unit 103 fetches the end report information on the end message table 221 (3), and then issues the contact interrupt to the communication interface unit 103 (4), Notification of completion of fetching the end report information from the communication interface unit 103 is given.

FIG. 8 shows a start / end processing procedure of one-to-one communication among the communication processing in the communication control interface and the interface between the communication interface section and the line control module. The start / end processing will be described separately below.

FIG. 8A shows the procedure for activating one-to-one communication in the two interfaces.

CPU 101 of host computer 100
When requesting the line control module 107 to transmit data to the line 109, the pair is set to the one-to-one communication activation queue table 201 on the main storage unit 102 of the host computer 100 corresponding to the line 109 to which the data is to be transmitted. One communication command is registered (1). Next, to the boot destination identification queue table 200 on the main storage unit 102,
The activation request is made by registering the activation destination identification information indicating the one-to-one communication activation queue table 201 to which the one-to-one communication command is registered (2). Then, the communication interface unit 103 periodically monitors the registration status of the CPU 101 in the activation destination identification queue table 200, and when detecting the registration of the activation destination identification information (3), the communication interface unit 103 in the corresponding line control module 107 Corresponding one-to-one communication command queue
The one-to-one communication command is registered in the table 240 (4). Here, in the one-to-one communication command, a communication type indicating whether the command is one-to-one communication or multicast communication, a transmission data storage address on the main storage unit 102, and a size of transmission data are recorded. Further, in the multicast communication command at the time of multicast communication, in addition to the contents of the one-to-one communication command, the number of the destination pattern table 500 used in the multicast communication start processing is recorded. Then, the registration destination of each command is recorded in the activation destination identification information.

FIG. 8 (b) shows a procedure for ending one-to-one communication in the two interfaces.

Upon completion of the one-to-one communication command processing, the line control module 107 registers the end information in the corresponding one-to-one communication end report queue table 203 in the main storage unit 102 (1). Then, various information is set in the interrupt notification table 242 and an interrupt is issued to the communication interface unit 103 (2). In the communication interface unit 103,
When the interrupt is received from the line control module 107, the interrupt notification table is fetched (3), the interrupt information is registered in the interrupt report destination identification queue table 207 in the main storage unit (4), and the interrupt is sent to the CPU 101. Issue.

A detailed processing procedure of data communication in the active communication interface section will be described below with reference to FIGS. 9 to 13.

First, referring to FIGS. 9, 10 and 11,
The flow of the start acceptance process / one-to-one communication start process and the interrupt acceptance process / interrupt report process will be described.

FIG. 9 shows the flow of the start acceptance process / one-to-one communication start process in the active communication interface section.

In the start acceptance processing 900, the communication interface unit 103 determines that the own system communication interface unit 103
It is discriminated whether the state is the master state or the slave state (step 901), and when it is the slave state, the discrimination processing is repeated. As a result of the determination (step 901), when the state of the own system communication interface unit 103 is the master state, the write pointer 301 and the read pointer 302 of the boot destination identification queue table 200 in the communication control interface area on the main storage unit 102 The presence / absence of registration information is checked from the difference (902). If there is no registration information (the difference is zero), the master / slave state of the own system communication interface unit 103 is checked again. If there is registration information as a result of the determination (step 902) (the difference is not zero), the boot destination identification information in the information registration area 303 indicated by the read pointer 302 of the boot destination identification queue table 200 is read (90).
3), the start type is determined from the contents of the start destination identification information (904). If the result of the determination (step 904) is that the activation type is the one-to-one communication activation, the one-to-one communication command queue in the line control module 107 corresponding to the one-to-one communication activation queue table 201 indicated by the activation destination identification information.・ Current write pointer 3 of table 240
The value of 11 (current write pointer) is stored in the main storage unit 10
2 for the corresponding line control module in the recording area for one-to-one communication 401 in the current write pointer table 210 in the recovery interface area
03 is registered in the corresponding line recording element 405 (90
5). Next, the updated value (next read pointer) of the read pointer 302 of the boot destination identification queue table 200 is recorded in the boot destination identification queue table recording field 410 of the next read pointer table 211 in the recovery interface area. As a result, the next read pointer of the boot destination identification queue table 200 is updated (906), and the destination of the information registration area 303 to be read next time is stored. Next, the one-to-one communication command of the information registration area 313 indicated by the read pointer 312 of the one-to-one communication activation queue table 201 is transferred to the information registration area of the write pointer 311 of the one-to-one communication command queue table 240 of the line control module 107. The write pointer 311 is written in 313 and the write pointer 311 is updated (907). Then, in the next read pointer table 211, the one-to-one communication activation queue table 2
The next read pointer of 01 is updated (908), and the read pointer 30 of the activation destination identification queue table 200 is updated.
2 is updated (909), the activation destination identification information is discarded, and C
The activation process in the communication interface unit 103 in response to the data communication request from the PU 101 is completed. Here, the next read pointer is the communication interface unit 103.
Indicates how far the registration information in the queue table has been read, and updating this pointer does not mean that the registration information is retrieved from the queue table. Note that this pointer is also initialized to zero at the time of initializing like the read pointer and the write pointer. The judgment (step 904)
As a result, when the start type is multicast communication start, the next read pointer of the start destination identification queue table 200 is updated (910), and the multicast communication start processing 9
The communication process is handed over to 11 (911), and the master / slave state of the own system communication interface unit 103 is checked again.

As described above, the active communication interface section performs the activation process in response to the data communication request from the CPU via the communication control interface only in the master state.

FIG. 10 shows an outline of data communication processing in the line control module.

FIG. 10A shows the line control module 10.
7 shows a procedure of a one-to-one communication activation process in 7.

The line control module 107 periodically monitors the command registration status from the communication interface unit 103, and the one-to-one communication command is registered in the one-to-one communication command queue table 240 by the processing described in FIG. When (1), the transmission data is transferred from the transmission / reception buffer 114 in the main storage unit 102 to the transmission / reception buffer 116 in the line control module 107 according to the content of the one-to-one communication command (2). Then, the transmission data is sent to the relevant line 109 (3).

Here, in the case of the multicast communication activation process, the transmission data is set in the transmission / reception buffer 115 in the communication interface unit 103 by the communication interface unit 103. Then, the line control module 107 transfers the transmission data from the transmission / reception buffer 115 to the transmission / reception buffer 116, and notifies the communication interface unit 103 of the start acceptance completion after the transfer is completed. Further, the line control module 107, after sending the transmission data to the line 109 and receiving a delivery confirmation for the data transmission from the line 109, updates the read pointer (312 or 332) of the corresponding command queue table and discards the corresponding command. . When the delivery confirmation is for data transmission during one-to-one communication, the communication interface unit 103 is notified of the end of the one-to-one communication.

The line control module 107 has a multicast communication command queue table 241 in addition to the one-to-one communication command queue table 240, and changes the ratio of periodic monitoring of each command queue table. Thus, the priority of data communication provided to the terminal 111 can be changed.

FIG. 10B shows the line control module 10.
7 shows a procedure of data reception processing from the terminal 111 in FIG.

When the line control module 107 reports data reception from the terminal 111 to the communication interface unit 103, the main storage unit 102 of the host computer 100.
The received data is transferred to the transmission / reception buffer 114 above (1). Then, the data reception report queue table 2 in the communication control interface area on the main storage unit 102
Register the reception report in 05 (2), interrupt notification table 2
Various information is set in 42 and an interrupt is issued to the communication interface unit 103 (3).

FIG. 11 shows an interrupt acceptance process and an interrupt report process in the active communication interface unit that has accepted an interrupt from the line control module.

In the interrupt acceptance process 1100, when the communication interface unit 103 receives an interrupt from the line control module 107, the communication interface unit 103 determines whether the state of the own system communication interface unit 103 is the master state or the slave state (1101).
In the slave state, this process ends. As a result of the determination (step 1101), the own system communication interface unit 1
When the status of 03 is master status, the line control module 1
The interrupt information of the interrupt notification table 242 in 07 is read (1102), and it is determined whether the valid flag 341 of the interrupt notification table 242 is ON (1103).
Result valid flag 341 of the determination (step 1102)
If is not in the ON state, this process ends and the valid flag 3
If 41 is ON, check the type of interrupt information (1
104). As a result of the investigation, the one-to-one communication end report flag 34
2 is ON, the interrupt information is the host computer 1
If it is a termination interrupt for activation from 00, the one-to-one communication activation queue table 20 corresponding to the interruption information
The read pointer 312 of 1 is updated (1105) and the corresponding one-to-one communication command is discarded. Then, the interrupt information is registered in the interrupt report destination identification queue table 207 on the main storage unit 102 (1106), and an interrupt is issued to the CPU 101 of the host computer 100 (110).
7), the valid flag 341 of the interrupt notification table 242 is turned off (1108). Further, as a result of the investigation, when the data reception report flag 344 is in the ON state and the interrupt information is data reception from the line 109, or when the communication interrupt report flag 343 is in the ON state and the interrupt information indicates that a communication error has occurred. Registers the interrupt information in the interrupt report destination identification queue table 207 (1106), C
An interrupt is issued to the PU 101 (1107) and the valid flag 341 is turned off (1108). Furthermore, as a result of the investigation, the multicast communication activation acceptance completion report flag 345
When is ON and the interrupt information indicates that the reception of the start of multicast communication has been completed, the interrupt reception processing is handed over to the reception processing 1109 of the completion notification of the start of multicast communication (1109).

As described above, when the active communication interface section receives an interrupt from the line control module, it performs interrupt acceptance processing according to the interrupt type only in the master state and reports it to the CPU of the host computer.

Next, the flow of the multicast communication process in the active communication interface section will be described with reference to FIGS. 12, 13 and 14.

FIG. 12 shows a flowchart of the multicast communication activation process in the active communication interface section.

CPU 10 in host computer 100
When the activation type of the activation destination identification information from 1 is the multicast communication activation, the communication interface unit 103 starts the activation acceptance processing 900 through the multicast communication activation processing 911.
Communication processing is taken over.

In the multicast communication activation process 911, the communication interface unit 103 detects the corresponding information registration area 322 of the multicast communication activation table 202 from the activation destination identification information, reads the corresponding multicast communication command, and reads the multicast communication command. According to the content, the multicast transmission data is transferred from the transmission / reception buffer 114 on the main storage unit 102 to the transmission / reception buffer 115 (1201). Next, the destination pattern table 500 designated by the CPU 101 by the multicast communication command is used for the work corresponding to the information registration area 322 in the multicast communication management table editing area 231 from the work area 230 for the destination pattern table. Start management area 512 and end monitoring area 514 of the multicast communication management table
To the multicast communication management table 208
The group of is created (1202). Then, the created multicast communication management table is set in the corresponding multicast communication management table 208 in the communication control interface area on the main storage unit 102 (1203). Next, the multicast communication management table editing area 2
The destination line of the multicast transmission data is detected from the activation management area 512 of the multicast communication management table in 31 (1204), and the corresponding line control module 107 is detected.
Multicast communication command queue table 24 in
Information registration area 333 indicated by the write pointer 331 of No. 1
Write the multicast communication command to (120
5). The communication interface unit 103 determines whether the writing has been normally performed (1206), and if the writing is normally performed, the multicast communication command queue table 2
The write pointer 331 of 41 is updated (1207), and the activation flag of the corresponding line in the activation management area 512 of the multicast communication management table 208 is rewritten from 1 to 0 (1208). Then, the write pointer 331 of the multicast communication command queue table 241 is set to the current write pointer table 210 on the main storage unit 102.
It is stored in the corresponding line recording element 406 of the corresponding line control module recording field 404 in the multicast communication recording area 402 (1209). As a result of the discrimination, if the data cannot be normally written, the registration is performed in the corresponding line control module number recording field 516 / line number recording field 517 / abnormality type recording field 518 in the abnormal end storage area of the corresponding multicast communication management table, respectively. The unavailable line control module number / line number and the abnormality type are stored (1210). Then, the abnormal termination total number 515 of the multicast communication management table is added (1211), the monitoring flag of the relevant line in the termination monitoring area 514 is rewritten from 1 to 0, and the unfinished report acceptance total number 513 is subtracted, and the start management area The start flag of the corresponding line in 512 is rewritten from 1 to 0 (1212). After the processing according to the respective determination contents, the total number 511 of non-startups of the corresponding multicast communication management table is subtracted (121
3), it is determined whether or not the total number of non-startups 511 is zero (121
4). As a result of the determination (step 1214), if the total number of unactivated lines 511 is not zero, the next destination line of the multicast transmission data is detected from the activation management area 512 of the multicast communication management table (120).
4), the same processing is performed thereafter. The determination (step 12
As a result of 14), when the total number of unactivated lines 511 is zero, it means that there is no line 109 for transmitting the multicast transmission data, and the communication interface unit 103 sends a reception completion report from the line control module 107 to the start of multicast communication. In order to monitor, the multicast communication end monitoring timer is activated (1215), the read pointer 302 of the activation destination identification queue table 200 is updated (1216), the activation destination identification information is discarded, and this processing ends.

In this way, the active communication interface unit fetches the multicast transmission data from the main storage unit,
Activation management area 5 of the multicast communication management table 208 created based on the designated destination pattern table 500
According to the contents of 12, the multicast communication command is registered in the multicast communication command queue table in each line control module to which the data transmission line is connected.

Here, in the above processing, step 1201
From the completion of step 1204 to step 1204, the multicast status 1 is set, and after the step 1204 is set, multicast status 2 is set. The multicast status 1 / multicast status 2 is an index for determining the recovery processing of the multicast communication in the system switching processing of the duplex communication interface unit 103.

When setting the destination pattern table 500 used in the multicast communication activation process in the work area 230 for the destination pattern table, the CPU 101 gives an instruction to the communication interface unit 103 by a destination pattern table setting command. In the CPU 101, before the first multicast communication after system startup, the destination pattern table setting command is set in the communication interface unit 1 in order to set the all destination pattern table 500 in the work area 230 for the destination pattern table.
Issue to 03. Then, the communication interface unit 103 receiving the destination pattern table setting command,
All destination pattern table 50 according to the command contents
0 is set in the destination pattern table work area 230, and the entire destination pattern table 500 is copied to the destination pattern table storage area 212 of the recovery interface area on the main storage unit 102. Furthermore, CPU1
In 01, when the necessity of data transmission to the line 109 is changed due to the occurrence of a line abnormality or the like, the flag of the corresponding line is changed in the corresponding destination pattern table 500, and the destination pattern table setting command is issued to the communication interface unit 103. . Then, the communication interface unit 103 which has received the destination pattern table setting command
Resets the changed destination pattern table in the destination pattern table work area 230 and the destination pattern table storage area 212 according to the content of the command.

Further, the communication interface section 103 simultaneously manages a plurality of multicast communication management tables 208 in a one-to-one correspondence with a plurality of information registration areas 322 in the multicast communication activation table 202, and carries out a plurality of multicast communication processes.

FIG. 13 is a flow chart of the multicast communication activation acceptance completion report acceptance processing in the active communication interface section.

When the type of the interrupt report from the line control module 107 in the multi-line communication control unit 105 is the multicast communication start acceptance completion report, the communication interface unit 103 transmits the multicast communication start acceptance completion report acceptance process from the interrupt acceptance process 1100. The interrupt processing is taken over by 1109.

In the multicast communication start acceptance completion report acceptance processing 1109, the communication interface unit 103
The corresponding multicast communication activation acceptance completion report queue table 209 is discriminated from the contents of the interrupt notification table 242, and the end information is read from the information registration area 313 indicated by the read pointer 312 of the multicast communication activation acceptance completion report queue table 209. (1301).
Next, it is determined whether the content of the end information is normal end (1302), and only when the end is abnormal, the corresponding line control module number / line number and error type are set in the corresponding multicast communication management table edit area 231. It records in the corresponding line control module number recording field 516 / line number recording field 517 / abnormality type recording field 518 in the abnormal end storage area of the table (1303), and the abnormal end total number 515 of the multicast communication management table is added ( 130
4). Next, the communication interface unit 103 uses the end monitoring area 514 of the multicast communication management table.
Rewrite the monitoring flag of the corresponding line in 1 to 0 (130
5) Regarding the relevant line 109, the fact that the activation acceptance completion report has been received is recorded, and the uncompleted report acceptance total number 513 of the multicast communication management table is subtracted (130).
6). Then, it is judged whether or not the total number of uncompleted report receptions 513 is zero (1307), and if it is not zero, the corresponding multicast communication activation reception completion report queue table 209.
The read pointer 312 is updated (1309), the end information is discarded, the valid flag 341 of the interrupt notification table 242 of the relevant line control module 107 is turned off (1310), and this processing is ended. As a result of the determination (step 1307), if the total number of uncompleted report receptions 513 is zero, it means that all the reception completion reports for the start of multicast communication have been received from each line control module 107, and the completion report of multicast communication is sent to the CPU 101. In order to do so, the process is handed over to the multicast communication end report process 1308 (1308), and the read pointer 31 of the multicast communication start acceptance completion report queue table 209
2 is updated (1309), the end information is discarded, the valid flag 341 of the interrupt notification table 242 of the relevant line control module 107 is turned off (1310), and this processing ends. Here, the multicast status, which is an index for determining the recovery process of the multicast communication in the system switching process of the duplicated communication interface unit, is 2 during the above process.

FIG. 14 shows a flowchart of the multicast communication end report processing in the active communication interface section.

When the communication interface unit 103 confirms in the multicast communication activation acceptance completion report acceptance processing 1109 that all acceptance completion reports for the multicast communication activation are received from each line control module 107, the communication interface unit 103 proceeds to the multicast communication end report processing 1308. Take over processing.

Multicast communication end report processing 1308
In step S 1, the communication interface unit 103 determines whether the end monitoring timer of the corresponding multicast communication is operating (1
401), the multicast communication end monitoring timer is stopped only when it is operating (1402). Next, the abnormal termination total number 515 of the corresponding multicast communication management table in the multicast communication management table editing area 231 is read (1403), and it is determined whether the abnormal termination total number 515 is zero (1404). Creates termination report information as a normal termination (140
5). As a result of the determination (step 1404), if the abnormal termination total number 515 is not zero, the termination report information is created by copying the abnormal termination storage area of the multicast communication management table (1406). Next, the created end report information is written in the information registration area 313 indicated by the write pointer 311 of the multicast communication end report queue table 204 on the main storage unit 102, and the write pointer 3 is written.
11 is updated (1407). Then, registering the end report information in the multicast communication end report queue table 204 indicates that the CPU 1 of the host computer 100
01 interrupt notification destination identification information is generated (1408), and the interrupt report destination identification information is stored in the information registration area 303 indicated by the write pointer 301 of the interrupt report destination identification queue table 207 in the main storage unit 102. It registers and updates the write pointer 301 (1409). Then, an interrupt is issued to the CPU 101 (1410),
This process ends. Here, in the above processing, the status of the multicast status 2 is maintained until the interrupt is issued to the CPU 101, which is the target of the recovery processing of the multicast communication in the system switching processing of the duplex communication interface unit 103.

As described above, when the active communication interface section receives the multicast communication start acceptance completion report from each line control module in the multi-line communication control unit,
End monitoring area 51 of multicast communication management table
For the corresponding line in No. 4, the monitoring flag is rewritten to zero and the received is stored. Then, upon completion of receiving the multicast communication activation acceptance completion report from the corresponding line control module for all the lines that have transmitted the multicast transmission data, the CPU notifies the CPU of the end of the corresponding multicast communication.

Here, the multicast communication end monitoring timer has timed out, and a notification of the completion of acceptance of the multicast communication activation is issued within a predetermined time for each line control module 10.
If the required number is not received from 7, the communication interface unit 103 terminates the acceptance completion report acceptance from the line control module 107 for the corresponding multicast communication activation. Next, in the end monitoring area 514 of the corresponding multicast communication management table in the multicast communication management table editing area 231, the line control module 107
A line for which the receipt of the completion report of the multicast communication start acceptance from is not recorded, that is, the end monitoring area 51.
4, the line whose monitoring flag is 1 is detected, the line is regarded as an abnormal end, and the line control module number / line number and the timeout are recorded in the abnormal end storage area of the multicast communication management table,
The total number of abnormal terminations 515 is added. When all the lines with the flag of 1 in the end monitoring area 514 are recorded in the abnormal end storage area, the communication interface unit 103 transfers the process to the multicast communication end reporting process 1308 and reports the end of the multicast communication to the CPU 101.

In the multicast communication processing described with reference to FIGS. 12, 13 and 14, the corresponding multicast communication management table in the multicast communication management table editing area 231 of the communication interface unit 103 is used as described above. Total number of tables not started 51
1 and subtraction of the total number of uncompleted report receptions 513, rewriting of the corresponding flags in the start management area 512 and the end monitoring area 514, and registration in the abnormal end storage area are simultaneously found in the communication control interface on the main storage unit 102. This is also performed for the multicast communication management table 208.

FIG. 15 shows a processing procedure in the active communication interface unit and the line control module according to the number of valid commands registered in the multicast communication command queue table 241 in the line control module.

FIG. 15A shows the communication interface unit 1.
No. 03, the CPU 10 determines the stay status of valid commands in the multicast communication command queue table 241.
2 shows a processing procedure for notifying the user of No. 1.

In the line control module 107, the line 10
If an anomaly occurs in 9 and throughput decreases, line 1
It is difficult to receive the delivery confirmation from 09. If this situation persists for a long time, each command queue table may fill with commands.

The communication interface unit 103 periodically reads the write pointer 331 and the read pointer 332 of the multicast communication command queue table 241, and the multicast communication command queue table 24 is read.
The stay status of valid commands in 1 is determined (1). When the number of valid command registrations in the multicast communication command queue table 241 exceeds a certain value, or when the number of valid command registrations exceeds a certain value and falls below a certain value, the communication interface unit 103 mainly operates. Information recording the contents of the state change is registered in the communication interrupt report table 206 on the storage unit 102 (2). Then, in order to notify the CPU 101 of the state change, the interrupt report destination identification queue table 20 on the main storage unit 102
The interrupt report destination identification information is registered in 7, and (3) an interrupt is issued. In the CPU 101, if the interrupt report has a content in which the number of valid commands registered in the multicast communication command queue table 241 exceeds a certain value, data is not transmitted to the line 109 corresponding to the multicast communication command queue table 241. Then, the flag of the line in the destination pattern table 500 is rewritten to zero and the communication interface unit 103 is notified by the destination pattern table setting command.

As described above, in the active communication interface unit, the multicast communication command queue table 2
The stay of commands 41 is periodically monitored so that the multicast communication command queue table 241 is not filled with commands.

Here, regarding the one-to-one communication command queue table 240, the number of the information registration areas 313 corresponds to the one-to-one communication command queue table 240, and the information registration area 313 of the one-to-one communication activation queue table 201. And the communication interface unit 1
In the one-to-one communication processing between the network control module 03 and the line control module 107, the CPUs are processed so that the number of valid commands in the corresponding queue tables is always the same.
No data transmission request is issued to the line 109 corresponding to the one-to-one communication command queue table 240 in which 101 is full.

FIG. 15B shows the communication interface unit 1.
3 shows a processing procedure of the line control module 107 when the multicast communication command registered from 03 is a command that exceeds a certain value as the number of valid command registrations in the multicast communication command queue table 241.

The line control module 107 reads the multicast communication command registered from the communication interface unit 103 in the multicast communication command queue table 241 and, according to the contents, from the transmission / reception buffer 115 in the communication interface unit 103 to the line control module 107. The multicast transmission data is transferred to the transmission / reception buffer 116 (1). When the multicast communication command is a command that exceeds a certain value as the number of valid commands registered in the multicast communication command queue table 241, the line control module 1
07 transfers the multicast transmission data from the transmission / reception buffer 116 to the corresponding area in the line control module expansion buffer area on the main memory 102 (2). When sending the multicast transmission data stored in the line control module expansion buffer area to the corresponding line 109, the line control module 107 directly sends and receives the transmission / reception buffer 116 from the line control module expansion buffer area.
Transfers the multicast transmission data to the corresponding line 109
Send to.

As described above, according to this embodiment, in the information communication system including the host computer having the communication interface section and the main storage section which are duplicated with the CPU as the constituent elements, and the multi-line communication control device, Since the communication management table is separately arranged and the CPU, the communication interface section, and the multi-line communication control device perform the communication processing in a distributed manner, the data transmission / reception on the same line in different communication services can reduce the CPU processing load. It can be carried out.

Next, the state management of the redundant communication interface section and the recovery processing for realizing the system switching and the guarantee of data continuity will be described.

First, the working / standby system switching means of the duplex communication interface section will be described.

As described above, the master / slave state of the duplicated communication interface section 103 is determined by the state of the interface channel 117. Therefore,
The transition of the state of the communication interface unit 103 is a means for instructing a change of the state of the interface channel 117,
That is, the internal bus control unit 10 connected to the interface channel 117 of the communication interface unit 103.
6 and the internal bus 108 by an interface channel connect / disconnect command instructing logical connection / disconnect. Here, this command is exchanged via the configuration control interface.

FIG. 16 shows activation information set in the activation information setting area of the activation message table in the configuration control interface area on the main memory when the interface channel connect / disconnect command is activated.

In the figure, 160 is a command ID indicating whether the start command indicates interface channel connection or disconnection, and 161 is the command ID 1
A subcommand ID indicating whether the instruction content represented by 60 requests all interface channels 117 in the communication interface unit 103 or only a specific designated interface channel 117,
Information 162 is valid only when the subcommand ID 161 indicates a designated interface channel request, and an interface channel address indicating the designated interface channel number. 163 is a communication interface unit 10 in the interface channel connection command.
3 is a data continuity guarantee request flag indicating the presence / absence of a communication process takeover request in the original master state when the state 3 is shifted from the slave state to the master state. Here, when the active / standby system switching of the redundant communication interface unit 103 is performed, the subcommand ID 161 is performed by all interface channel requests, and the designated interface channel request is made when one multi-line communication control unit 105 is added / replaced. To use. Therefore, the data continuity assurance request flag 163 is
It is treated as valid information only when the subcommand ID 161 in the interface channel connection command represents all interface channel requests.

A processing flow when the communication interface unit receives the interface channel connection / disconnection command will be described with reference to FIGS. 17 and 18.

FIG. 17 is a flow chart showing the processing in the communication interface section when an interface channel connection command is received from the CPU of the host computer via the configuration control interface.

CPU 101 of host computer 100
From the start message table 2
The communication interface unit 103 that has loaded the activation information setting area 602 of 20 recognizes the activation of the interface channel connection command from the command ID 160, and executes the interface channel connection processing 1700. In the interface channel connection processing 1700, first, the subcommand ID 161 is checked (1701), and if all interface channel connection requests are represented, the internal bus control unit 106 and the internal bus 108 connected to each interface channel 117 are connected. Perform logical disconnection (17
02), all-line control module 1 of the multi-line communication control device 105 connected to each interface channel 117.
A bus transfer prohibition interrupt is issued to 07 (1703). Then, logical connection between the internal bus control unit 106 and the internal bus 108 connected to each interface channel 117 is performed for all the interface channels 117 (17
04), the state of the communication interface unit 103 shifts to the master state (1705). After that, the data continuity guarantee request flag 163 is checked (1706), and if the data continuity guarantee is requested, the active system takeover process is executed (1
707), the bus transfer prohibition is released to all the line control modules 107 of the multi-line communication control unit 105 connected to each interface channel 117 (1708). Here, if the communication interface unit 103 that has received the interface channel connection command of the all interface channel connection request is in the master state, nothing is done. On the other hand, when the designated interface channel connection request is represented, the internal bus control unit 106 and the internal bus 108 connected to the designated interface channel 117 represented by the interface channel address 162 are logically connected (1709), and communication is performed. The state of the interface unit 103 is checked (1710), and if it is a slave state, that state is changed to the master state (1711).

FIG. 18 is a flow chart showing the processing in the communication interface section when the interface channel disconnection command is received from the CPU of the host computer via the configuration control interface.

CPU 101 of host computer 100
From the start message table 2
The communication interface unit 103 that has loaded the startup information setting area 602 of 20 recognizes the startup of the interface channel disconnection command from the command ID 160,
The interface channel disconnection processing 1800 is executed. In the interface channel disconnection processing 1800,
First, the subcommand ID 161 is checked (180
1) If the request indicates disconnection of all interface channels, logical disconnection between the internal bus control unit 106 and the internal bus 108 connected to each interface channel 117 is performed for all interface channels 117 (1
802), and shifts the state of the communication interface unit 103 to the slave state (1803). On the other hand, when the designated interface channel disconnection request is represented, the multi-line communication control device 1 connected to the designated interface channel 117 represented by the interface channel address 162.
The internal bus control unit 106 and the internal bus 108 of No. 05 are logically separated (1804), the states of other interface channels 117 are checked (1805), and if there is no reserved state, the state of the communication interface unit 103 is checked. Transition to the slave state (1806). Here, if the communication interface unit 103 that has received the interface channel disconnection command is in the slave state, nothing is done. Further, the communication interface unit 103 that has transitioned from the master state to the slave state by this interface channel disconnection command interrupts all the communication control processing that is being processed therein, and as described above with reference to FIGS. 9 and 11. After that, the startup acceptance and interrupt acceptance processing via the communication control interface are not performed thereafter.

Next, the working / standby system switching procedure of the duplex communication interface section will be described with reference to FIGS. 19 and 20.

To switch the active / standby system of the redundant communication interface unit 103, the active communication interface unit 10 is used.
3-a, or the connection path (expansion bus cable 118, internal bus control unit 106) between the active communication interface unit 103-a and the multi-line communication control device 105 or the internal bus 108 of the multi-line communication control device 105 has a failure. There is a failure switching that is performed when it occurs, and a maintenance switching that is systematically performed by an operator by operating a key on the console.

FIG. 19 is a diagram showing a procedure for switching the working / standby system of the duplex communication interface unit at the time of failure switching.

The active communication interface unit 103, or a connection path (expansion bus cable 118, internal bus control unit 106) between the active communication interface unit 103 and the multi-line communication control device 105 and the internal bus of the multi-line communication control device 105. The CPU 101 of the host computer 100, which has detected the occurrence of a failure in 106, instructs the active communication interface unit 103-a to stop the operation of the MPU 112-a, and instructs the standby communication interface unit 103-b to execute the interface channel connection command (all Interface channel connection and data continuity guarantee). Standby communication interface unit 103-b receiving the command
Is the interface channel connection processing 1700 described above.
Steps 1702-1708 are executed.

Here, the failure detection of each component is performed by the following means.

The redundant communication interface section 103 is monitored by the CPU 101 of the host computer 100 by periodical access check, and the internal monitoring by the communication interface section 103 itself (watchdog).
The failure is detected by (such as a timer).

As for the components (internal bus control unit 106, line control module 107, internal bus 108) in the multi-line communication control unit 105, the active communication interface unit 103-a periodically checks each component. Monitored by the host computer 10
0 to the CPU 101 is reported.

FIG. 20 is a diagram showing a procedure for switching the working / standby system of the duplex communication interface unit at the time of switching maintenance.

The host computer 1 which detects that the operator has requested the switching of the active / standby system of the redundant communication interface section 103 by the key operation on the console.
CPU 101 of 00 is the active communication interface unit 1
The interface channel disconnect command (request to disconnect all interface channels) is activated to 03-a. Standby communication interface unit 103-b receiving the command
Is the interface channel disconnection processing 180 described above.
Steps 1802-1803 of 0 are executed, and the completion of the process is reported to the CPU 101. CP that received the completion report
U101 activates an interface channel connection command (requesting all interface channel connections and data continuity guarantee) to the standby communication interface unit 103-b. Standby communication interface unit 1 that received the command
03-b executes steps 1702-1708 of the interface channel connection processing 1700 described above.

As described above, by using the interface channel connect / disconnect command, the active communication interface unit 103-a to the standby communication interface unit 10
By switching the active system to 3-b, the internal bus control unit 106-a is logically disconnected from the internal bus 108, and the internal bus control unit 106-b is logically connected to the internal bus 108.

Further, FIG. 21, FIG. 22, FIG. 23, and FIG.
4, FIG. 25, and FIG. 26, the active system process takeover process in the communication interface unit that has received the interface channel connection command (requesting all interface channel connections and data continuity guarantee) will be described.

FIG. 21 is a diagram showing the overall processing flow of the active processing takeover processing.

The active system takeover process 1707 is as follows.
A communication control information recovery process for recovering the communication control information used in the above-described multicast communication process on the communication interface unit 103 is performed (2101), and then an interrupt is received from the line control module 107 of the multi-line communication control device 105. After performing the interrupt acceptance recovery processing for inheriting the processing (2102), the activation acceptance recovery processing for inheriting the activation acceptance processing from the CPU 101 of the host computer 100 via the communication control interface is performed (2103).
Finally, a multicast communication end report recovery process that takes over the end report process of the multicast communication process is performed (2104).

FIG. 22 is a flow chart of communication control information recovery processing for recovering the communication control information used in the multicast communication processing on the communication interface unit.

In the communication control information recovery processing 2101, first, all the destination pattern tables 500 in the destination pattern table storage area 212 of the recovery interface area on the main storage unit 102 are set in the communication interface unit 1.
It is copied to the work area 230 for the destination pattern table on 03 (2201). Next, the presence / absence of a valid multicast communication command is checked from the activation flag 321 of the multicast communication activation table 202 in the communication control interface area on the main storage unit 102 (2202). Then, if there is a valid multicast communication command, it is checked whether the multicast communication processing is multicast status 2 (2203), and the multicast status 2
If so, the corresponding multicast communication management table 208 in the communication control interface area is copied to the multicast communication management table edit area 231 on the communication interface unit 103 (2204), and if not, the copy is not performed. If there is no valid multicast communication command, nothing is done. Then, the multicast transmission data of the corresponding multicast communication command is copied from the transmission / reception buffer 114 on the main storage unit 102 to the transmission / reception buffer 115 on the communication interface unit 103 (2205). Then, in the above process, step 220
2 to 2205 as the multicast communication activation table 202
The information registration area is repeated (2206).

In this way, only the information necessary for taking over the processing of the multicast communication which has been processed in the active system can be reproduced in the communication interface section of the standby system before the actual processing takeover.

FIG. 23 is a flowchart of an interrupt acceptance recovery process for taking over the interrupt acceptance process from the line control module of the multi-line communication control device.

In the interrupt acceptance recovery processing 2102, first, it is checked whether the valid flag 341 of the interrupt notification table 242 on each line control module 107 of the multi-line communication control unit 105 connected to the communication interface unit 103 is ON ( 2301), if ON, the type of the corresponding interrupt is determined from each of the report flags 342 to 345 of the interrupt notification table 242 (2302). If the corresponding interrupt is a one-to-one communication end report, the one-to-one communication activation queue table 2 in the communication control interface area on the main storage unit 102 corresponding to the interrupt notification table 242.
01 read pointer 312 and the write pointer 311 of the one-to-one communication end report queue table 204, it is checked whether or not the update processing of the read pointer 312 of the one-to-one communication activation queue table 201 is being performed (230).
3) If update processing has not been performed (read pointer 3
12 and the write pointer 311 are not equal), the read pointer 312 is updated (2304). Then, the interrupt information of the corresponding interrupt notification table 242 is registered in the interrupt report destination identification queue table 207 and an interrupt is issued to the CPU 101 of the host computer 100 (2305), and the valid flag 341 of the corresponding interrupt notification table 242 is turned off ( 2306). If the corresponding interrupt is data reception or communication interrupt report, only steps 2305 to 2306 of the above processing are performed. Further, when the corresponding interrupt is the multicast communication activation acceptance completion report, the end monitoring area 5 of the multicast communication management table 208 corresponding to the interrupt notification table 242.
It is checked whether or not the 14 monitoring flags are rewritten from 1 to 0 (2307), and if 1, the corresponding monitoring flag is rewritten to 0 (2308). After that, in the end report area 514,
It is checked whether or not subtraction processing of the total number of uncompleted report receptions 513 (Mb) is performed from the total number (Ma) of which the monitoring flag is 1 (2309). If the subtraction processing is not performed (Ma <M
b), the total number of uncompleted report receptions 513 is subtracted (231)
0). On the other hand, when the valid flag 341 is OFF, nothing is done. Then, processing steps 2301 to 2310
Is repeatedly performed for all line control modules 107 of the multi-line communication control device 105 connected to the communication interface unit 103 (2311).

In this way, each report interrupt from all line control modules 107 of the multi-line communication control unit 105 connected to the communication interface unit 103 can be received and processed without omission.

FIG. 24 is a flowchart of the boot acceptance recovery process that takes over the boot acceptance process from the CPU of the host computer via the communication control interface.

In the boot acceptance recovery process 2103, first, the read pointer 302 of the boot destination identification queue table 200 in the communication control interface area on the main storage unit 102 and the boot destination identification queue of the next read pointer table 211 in the recovery interface area. From the value of the table recording field 410, it is checked whether the active communication interface unit 103 is in the process of accepting a command exchanged via the communication control interface (2401), and if there is (the read pointer 30).
2 and the next read pointer are not equal), the read pointer 302 of the boot destination identification queue table 200
The boot destination identification information registered in the information registration area 303 indicated by is checked (2402), and the following boot takeover processing is performed. Then, when the activation destination identification information is one-to-one communication activation, the line control module 1 indicated by the activation destination identification information
Corresponding one-to-one communication command queue table 24 on 07
The write pointer 311 of 0 and the current write pointer of the current write pointer table 210 in the recovery interface area is read to the one-to-one communication command queue table 240 of the one-to-one communication activation queue table 201 indicated by the activation destination identification information. Pointer 3
It is checked whether the one-to-one communication command information in the information registration area 313 indicated by 12 has been registered (2403). If not registered (when the write pointer 311 and the current write pointer are equal), the corresponding one-to-one communication command queue The one-to-one communication command information is registered in the table 240 (2406), and the one-to-one communication activation queue table 2 in the next read pointer table 211 is registered.
The next read pointer of 01 is updated (240
7). If the one-to-one communication command information has already been registered in the corresponding one-to-one communication command queue table 240, the read pointer 312 of the one-to-one communication activation queue table 201 and the corresponding next read pointer of the next read pointer table 211. Then, it is checked whether or not the next read pointer of the one-to-one communication activation queue table 201 has been updated (2404). If it has not been updated, step 2407 is executed. And
The corresponding boot destination identification information is discarded from the boot destination identification queue table 200 (2405). If the activation destination identification information indicates that the multicast communication is activated, it is checked whether or not the corresponding multicast communication processing is multicast status 1 (2408). A request is made to execute the multicast communication activation process 1200 for processing (2409). On the other hand, if the multicast status is not 1, a multicast communication activation recovery process is performed (2410).

In this way, various startups from the CPU of the host computer via the communication control interface are exited /
It can be processed without duplication. Note that in the startup acceptance recovery process, the startup acceptance control of the communication control interface is limited so that the command currently being processed can be limited to one at the time of normal startup acceptance so that only one startup command needs to be accepted and recovered. Is going.

FIG. 25 is a flow chart of a multicast communication start recovery process for taking over the multicast communication start process from the CPU of the host computer via the communication control interface to the line control module of the multi-line communication control device during the multicast communication start acceptance process. is there.

Multicast communication start recovery processing 24
In 10, the multicast communication activation process is being performed based on the total number of unactivated 511 of the corresponding multicast communication management table in the multicast communication management table editing area 231 on the communication interface unit 103 and the number of activated lines obtained from the corresponding destination pattern table 500. A line expected to be present is detected (2501). Then, it is checked whether the activation flag corresponding to the detected line in the activation management area 5112 of the multicast communication management table has been rewritten (2502). As a result, when the rewriting has not been processed (the activation flag is 1), the write pointer 331 of the multicast communication command queue table 241 of the line control module 107 corresponding to the line and the main storage unit 102.
A multicast communication command is registered in the multicast communication command queue table 241 from the current write pointer stored in the corresponding line recording element 406 in the multicast communication recording area 402 of the current write pointer table 210 in the upper recovery interface area. (250
3) If the command is not registered (when the write pointer 331 and the current write pointer are equal), the multicast communication command is registered in the multicast communication command queue table 241 and the activation flag is rewritten to 0. (2504). Then, the write pointer 331 of the multicast communication command queue table 241 is stored in the corresponding line recording element 406 in the multicast communication recording area 402 of the current write pointer table 210 (2505), and the multicast communication management table is not activated. 1 is subtracted from the total number 511 (2506). After that, the multicast communication activation processing (steps 1205-1214 of the multicast communication activation processing 1200) to the remaining activation instruction lines is performed (2507), and the processing is repeated until the total number of non-activations 511 in the multicast communication management table becomes zero (2508). .
Then, the corresponding boot destination identification information is discarded from the boot destination identification queue table 200 (2509), and after the active processing takeover processing 1707 is completed, a multicast communication end monitoring timer for monitoring the completion of the multicast communication processing is started. (2510).

Thus, regarding the multicast communication during the start-up process to each designated line control module in the multi-line communication control unit in the active communication interface section,
Loss of the line that sends the multicast transmission data /
Processing can be taken over without duplication.

FIG. 26 is a flow chart of the multicast communication end report recovery processing which takes over the end report processing of the multicast communication processing.

Multicast end report recovery processing 21
In 04, first, the multicast communication activation table 202 in the communication control interface area on the main storage unit 102.
The presence / absence of a valid multicast communication command is checked from the start flag 321 of (2601). Then, if there is a valid command, it is checked whether or not the multicast communication processing is multicast status 2 (2602), and if it is multicast status 2, the communication interface unit 10
It is checked whether or not the total number of unfinished report receptions 513 of the corresponding multicast communication management table in the multicast communication management table editing area on No. 3 is zero (2603). If the total number of unfinished report receptions 513 is zero, among the valid end report information registered in the information registration area 313 between the write pointer 311 and the read pointer 312 of the multicast communication end report queue table 204. The total number of unfinished report receptions 513 was zero. It is checked whether the corresponding end report information is registered in the multicast communication management table (2604). If not registered, the corresponding multicast communication processing is performed from the multicast communication management table. End report information is created and registered in the multicast communication end report queue table 204 (2605). Then, the interrupt report destination identification information indicating the multicast communication end report is registered in the interrupt report destination identification queue table 207 (2606), and an interrupt is issued to the CPU 101 of the host computer 100 (2607). Then, steps 2602 to 2607
Is repeated for the information registration area of the multicast communication activation table 202 (2608).

In this way, the multicast communication end report processing to the CPU of the host computer can be taken over.

As described above, according to the present embodiment, since the process progress information before the active / standby system switching of the communication interface unit can be exchanged via the main memory unit of the host computer which is a fault tolerant computer, the communication interface unit, Alternatively, it is possible to provide a highly reliable information communication system that can guarantee that the processing before and after the system switching can be taken over even if the internal bus control unit of the multi-line communication control device fails and the active / standby system of the communication interface unit is switched. it can.

[0138]

As described above, according to the present invention, the components of the host computer and the multi-line control device are duplicated. Therefore, if the duplicated components fail, the data communication processing is performed by switching the active system. Since the processing of the active system is taken over via the main storage unit of the host computer, due to the failure of the redundant configuration unit on the host side, the data communicating with the user using the terminal is lost, This has the effect of preventing the user from being unable to use the information communication system for a certain period of time.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an information communication system and an internal configuration diagram of a host computer on a host side and a multi-line communication control device according to an embodiment of the present invention.

FIG. 2 is a communication processing interface structure diagram on the host side in the information communication system according to the embodiment of the present invention.

FIG. 3 is a structural diagram of a table constituting a communication control interface in the information communication system according to the embodiment of the present invention.

FIG. 4 is a structural diagram of a table forming a recovery interface in the information communication system according to the embodiment of the present invention.

FIG. 5 is a structural diagram of a control table used in a multicast communication process in the information communication system according to the embodiment of the present invention.

FIG. 6 is a structural diagram of a table constituting a configuration control interface in the information communication system according to the exemplary embodiment of the present invention.

FIG. 7 is a diagram showing a schematic procedure of start / end processing in the configuration control interface of the information communication system according to the embodiment of the present invention.

FIG. 8 is a diagram showing a schematic procedure of start / end processing of one-to-one communication in the communication control interface of the information communication system according to the embodiment of the present invention.

FIG. 9 is a flowchart diagram of a boot acceptance process / one-to-one communication boot process in the communication interface unit of the information communication system according to the embodiment of the present invention.

FIG. 10 is a diagram showing a schematic procedure of a data communication process in the line control module of the information communication system according to the embodiment of the present invention.

FIG. 11 is a flowchart of interrupt acceptance processing and interrupt reporting processing in the communication interface unit of the information communication system according to the embodiment of the present invention.

FIG. 12 is a flowchart diagram of a multicast communication activation process in the communication interface unit of the information communication system according to the embodiment of the present invention.

FIG. 13 is a flowchart diagram of a multicast communication activation acceptance completion report acceptance process in the communication interface unit of the information communication system according to the embodiment of the present invention.

FIG. 14 is a flowchart diagram of a multicast communication end report process in the communication interface unit of the information communication system according to the embodiment of the present invention.

FIG. 15 is a diagram showing a schematic procedure of processing according to the effective number of multicast communication commands in the communication interface unit and the line control module of the information communication system according to the embodiment of the present invention.

FIG. 16 is a diagram showing a start information format of an interface channel connection / disconnection command used for switching the active / standby system of the duplex communication interface unit of the information communication system according to the embodiment of the present invention.

FIG. 17 is a flowchart diagram of an interface channel connection process in the communication interface unit of the information communication system according to the embodiment of the present invention.

FIG. 18 is a flowchart diagram of an interface channel disconnection process in the communication interface unit of the information communication system according to the embodiment of the present invention.

FIG. 19 is a diagram showing a failure switching procedure of the duplicated communication interface unit of the information communication system according to the embodiment of the present invention.

FIG. 20 is a diagram showing a maintenance switching procedure of the duplicated communication interface unit of the information communication system according to the embodiment of the present invention.

FIG. 21 is a flow chart diagram of active system takeover processing in the communication interface unit of the information communication system according to the embodiment of the present invention.

FIG. 22 is a flowchart showing a communication control information recovery process in the active process takeover process in the communication interface unit of the information communication system according to the example of the present invention.

FIG. 23 is a flowchart showing an interrupt acceptance recovery process in the active process takeover process in the communication interface unit of the information communication system according to the example of the present invention.

FIG. 24 is a flow chart diagram showing a startup acceptance recovery process in the active process takeover process in the communication interface unit of the information communication system according to the example of the present invention.

FIG. 25 is a flowchart showing a multicast communication startup recovery process executed in the startup acceptance recovery process in the active process takeover process in the communication interface unit of the information communication system according to the example of the present invention.

FIG. 26 is a flowchart showing a multicast communication end report recovery process in the active process takeover process in the communication interface unit of the information communication system according to the example of the present invention.

[Explanation of Codes] 100 ... Host computer, 101 ... CPU, 102 ... Main storage unit, 103 ... Communication interface unit, 105 ... Multi-line communication control device, 106 ... Internal bus control unit, 107 ... Line control module, 112, 113 ... MPU, 114, 115, 116 ... Transmission / reception buffer, 117 ... Interface channel, 200 ... Activation destination identification queue table, 201 ... One-to-one communication activation queue table, 202 ... Multicast communication activation table, 203 ... One-to-one communication end report Queue table, 204 ... Multicast communication end report queue table, 205 ... Data reception report queue table, 206 ... Communication interrupt report queue table, 207 ... Interrupt report destination identification queue table, 208 ... Multicast communication management table 209 ... Multicast communication activation acceptance completion report queue
Table, 210 ... Current write pointer table, 211 ... Next read pointer table, 212 ... Destination pattern table storage area, 220 ... Start message table, 221 ... End message table, 230 ... Destination pattern table work area, 231 ... Multicast communication management Table editing area, 240 ... One-to-one communication command queue table, 241 ... Multicast communication command queue table, 242 ... Interrupt notification table, 500 ... Destination pattern table, 900 ... Start acceptance process, 1100 ... Interrupt acceptance process, 911 ... Multicast Communication start processing, 1109 ... Multicast communication start reception completion report reception processing, 1308 ... Multicast communication end report processing, 1700 ... Interface channel Continuation process, 1800 ... Interface channel disconnection process, 1707 ... Working process takeover process, 2101 ... Communication control information recovery process, 2102 ... Interrupt acceptance recovery process, 2103 ... Startup acceptance recovery process, 2410 ... Multicast communication startup recovery process, 2104 ... Multicast communication end report recovery processing.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuya Kawahara, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa, Ltd. Inside the Microelectronics Device Development Laboratory, Hitachi, Ltd. (72) Keiichi Nakane 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa House number Hitachi Ltd. Microelectronics equipment development laboratory (72) Inventor Masakazu Okada 5-2-1 Omika-cho, Hitachi City, Ibaraki Hitachi Ltd. Omika factory (72) Inventor Shoji Yamaguchi Omika-cho, Hitachi City, Ibaraki Prefecture 5-2-1 Co., Ltd. Hitachi Ltd. Omika Plant (72) Inventor Yoshimi Fujimata 5-2-1 Omikacho, Hitachi-shi, Ibaraki Hitachi Process Computer Engineering Co., Ltd.

Claims (7)

[Claims] 1. A host computer in which internal constituent elements including at least a central control unit and a main memory are multiplexed, and if one fails, the host computer continues processing by the other, and a plurality of host computers each connected by a plurality of communication lines. An information communication system comprising a plurality of multi-line communication control devices for transmitting and receiving data to and from an information terminal, wherein the plurality of multi-line communication control devices respectively control a plurality of communication lines. A line control module, an internal bus connecting the plurality of line control modules, and a plurality of internal bus control units for controlling the internal bus and having an interface with the host computer; It has the same number of communication interface units as the internal bus control units for interfacing with the multi-line communication control device, A communication control interface area for activating communication processing to the multi-line communication control device, a configuration control interface area for performing system switching processing of the communication interface section, and continuous communication data at system switching of the communication interface section. An information communication system characterized by controlling a system switching of the communication interface unit by using a recovery interface area for exchanging communication process progress takeover information for guaranteeing the reliability. 2. The information communication system according to claim 1, wherein the communication interface unit is one that is logically connected to the internal bus of the multi-line communication control unit via the internal bus control unit. An information communication system characterized in that those logically separated are managed as a standby system. 3. The information communication system according to claim 1, wherein, as a command exchanged via the configuration control interface area, the inside of a multi-line communication control device connected to the interface channel to the communication interface section. Logical connection between bus controller and internal bus /
An interface channel connection command and an interface channel disconnection command for instructing disconnection are provided, and the communication interface unit transfers the active system to the standby system by the interface channel disconnection command and the standby system to the active system by the interface channel connection command. Characteristic information communication system. 4. The information communication system according to claim 3, wherein the communication interface unit that has shifted from the active system to the standby system by the interface channel disconnection command interrupts the processing of the command activated via the communication control interface area, And the communication interface unit that has stopped accepting the activation and moved from the standby system to the active system by the interface channel connection command, detects the communication interface that was previously the active system from the communication process progress takeover information in the recovery interface area. An information communication system characterized by guaranteeing continuity of communication data by taking over a process interrupted by a section. 5. The information communication system according to claim 1, wherein the communication control interface area is provided with a multicast communication management table for recording management information in multicast communication processing in the communication interface section. Information communication system. 6. The information communication system according to claim 1, wherein the central control unit sets a destination pattern table indicating a data transmission destination line in multicast communication through the communication control interface area in a communication interface unit. The communication interface unit having a pattern table setting command and receiving the command,
An information communication system, characterized in that the set destination pattern table is also stored in a destination pattern table storage area provided in the recovery interface area. 7. The information communication system according to claim 6, wherein in the recovery interface area, a one-to-one communication for each line of each line control module of the multi-line communication control device and a data transmission start-up state in a multicast communication are provided. It stores the current write pointer table to be recorded, the next read pointer table to record the activation status from the central control device in the communication control interface, and the destination pattern table notified by the destination pattern table setting command. An information communication system characterized in that a destination pattern table storage area is provided.