JPS61194939A - Communication controller - Google Patents

Abstract

PURPOSE:To attain ease of demarcation of a cause to a fault by using plural active lines in the unit of block, using a stand-by circuit in common between blocks in a device where the block units are provided for plural number to relieve the double fault in the block thereby reducing the re-leading time. CONSTITUTION:When a communication control section 1 detects an error and it is not recovered by retrial processing, a line address of a faulty line is registered by a state management section 2, and when other fault line does not exists in the same line adaptor 4 and stand-by line connecting circuit 15 is idle, the operation is registered and informed to a line address control section 3. Under the control of a switch control section 11, a switching by an n:1 switching section 13 is executed, an address of a fault line is set to a stand-by line connecting circuit 15 by an address setting section 12 and a faulty line 14 is closed. If the line is switched to the stand-by line connection circuit 15 due to other line fault when a faulty line takes place, the line is connected to a line adaptor interface 23 and connected to the stand-by line connection circuit 15 of the next and succeeding stages.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is used for connecting an information processing device to a communication line.
The present invention relates to a communication control device that performs control.

〔overview〕

The present invention provides a communication control device including a plurality of line connection circuits each having a working line connection circuit and a protection line connection circuit, in which the protection line connection circuit can be switched to the working line connection circuit of all the line connection circuits. By configuring this, it is possible to effectively utilize the standby line and prevent communication interruptions as much as possible.

[Conventional technology]

The conventional device has a configuration in which one protection line connection circuit is provided for a plurality of working lines, and communication can be continued using the switched protection line connection circuit in the event of a failure in the working line connection circuit.

[Problem that the invention seeks to solve]

With such conventional equipment, simultaneous failure of two lines,
Alternatively, if a failure occurs during maintenance and inspection of the backup circuit, switching to the backup circuit cannot be performed, resulting in a permanent failure. In addition, even in equipment that has one backup circuit17 and multiple line support sections each consisting of multiple active circuits, each unit is controlled, so the spare circuits of other line support sections are free. However, this backup circuit cannot be switched and used, resulting in a permanent failure.

The present invention aims to eliminate such drawbacks and to provide a communication control device that can flexibly deal with failures by effectively utilizing vacant spare circuits.

[Means for solving problems]

In the present invention, a host device is connected to a plurality of line correspondence units via one communication control unit, each line correspondence unit accommodates a plurality of lines, and one or more of the plurality of lines is assigned as a working line. one or a small number of the plurality of lines are assigned as a protection line, and each line corresponding unit includes a switching means for switching the connection with the communication control unit to the protection line when there is a failure in the working line. As a means to solve the above-mentioned problem in the control device, information about line switching of each line handling section is input, and when all the backup lines of one line handling section are used, that line switching is performed again. a means for identifying that a fault has occurred in the circuit of the section;
The present invention is characterized by comprising a control means that controls the communication control section to connect the signal connected to the line in which the failure has occurred to a protection line of another line corresponding section.

[For production]

The line support section has a protection line connection circuit for one line, and when a failure occurs in one line of the working line, it automatically uses the protection line connection circuit to enable continuation of communication. Furthermore, if a failure occurs in two lines simultaneously in the line handling section, or if a failure occurs in one line and a backup circuit is used, but a failure occurs in the second line before maintenance is restored, a failure may occur. Communication continues using the backup line connection circuit of the other line support unit that has not been connected.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A device according to an embodiment of the present invention will be explained below based on the drawings.

The figure is a block configuration diagram showing the configuration of an apparatus according to an embodiment of the present invention. First, the configuration of this embodiment device will be explained based on the drawings. This embodiment device includes a communication control section 1, a status management section 2, a line address control section 3, and m line correspondence sections 4, in which the line correspondence section 4 includes a switching control section II and an address control section 2. It includes a setting section 12, an n-to-l switching section 13, n working line connection circuits 14, and one protection line connection circuit 15. This device is inserted between a host device and a large number of terminal devices, a communication control unit 1 is connected to the host device via a host device interface 21, and m n-to-1 switching units 1
3 is connected to a terminal device via a line interface 22. An address setting section 12 and either a working line connection circuit 14 or a protection line connection circuit 15 are connected between the communication control section 1 and the n-to-1 switching section 13 . On the other hand, the communication control section I is connected to a state management section 2, this state management section 2 is connected to a line address control section 3, and the line address control section 3 is connected to each of the n switching control sections 11.

The switching control section 11 has an address setting section 12 and an n-to-1 switching section I.
3. The m n-to-1 switching units 13 are connected in a loop.

Next, the operation of this embodiment device will be explained based on the drawings.

The communication control unit 1 connected to the host device is equipped with communication data transfer control means such as various communication control procedures, communication methods, communication speed threads, and error detection. The line correspondence section 4, which performs conversion and the like, is controlled, and communication data is transmitted and received between the terminal device connected thereto and the host device. When an error is detected by the error detection means of the communication control unit 1 and does not recover even after connection try processing such as retransmission, the line address of the faulty line is registered in the status management unit 2, and the fault line is There is no other faulty line in the line support unit 4 that it has, and
And if the backup line connection circuit 15 is vacant,
The state management section 2 registers the use of the spare circuit, and the line address control section 3 is notified of the line address.

The line address set from the line address control unit 3 to the protection line connection circuit 15 is sent to the switching control unit 11 of the circuit corresponding unit 4 in which the failed line exists, and under the control thereof, switching is performed by the n-to-l switching unit 13. , and the address of the faulty line is set in the address setting unit 12 in the protection line connection circuit 15, and the faulty working line connection circuit 14 is blocked.

Next, a case will be described in which, when a faulty line occurs, another line already has a fault in the line corresponding section 4 and is switched to the protection line connection circuit 15. When a failed line address is registered in the status management unit 2 due to the occurrence of a failed line, the status management unit 2 detects that there is already a failed line in the same line handling unit 4, and the line address control unit 3 The occurrence of a double failure and its line address are reported. Based on the output of the line address control unit 3, the switching control unit 11 of the line handling unit 4 in which the double fault has occurred connects the n-to-1 switching unit 13 to the line handling unit interface 23, and at the same time connects the next-stage backup line. This interface 23 between line corresponding parts is connected to the spare line connecting circuit 15 of the vacant line corresponding part 4 of the connecting circuit 15.
instruction control is performed to connect the address setting section 12.
The line address is set. The line address control unit 3 monitors the switching control, line address setting, and blockage in the line correspondence unit 4, and when a completion signal is received from the switching control unit 11 and the setting is completed, a response is sent back to the status management unit 2. A restart signal for the faulty line is sent from the state management unit 2 to the communication control unit 1, and the alternate communication by the backup line connection circuit 15 is resumed.

Next, the line support unit 4 that provides the backup circuit by transferring it from another line support unit 4 further transfers the data to the working line connection circuit 14.
If a failure occurs, the line transferred by the line address control unit 3 to the line handling unit 4 where the double failure has occurred will be treated as a permanent failure, and the line transferred to the line handling unit 4 where the double failure has occurred will be processed as a permanent failure. Switching to the normal backup circuit is performed.

When the faulty working line connection circuit 14 is restored to active use by repair or maintenance replacement, the state management unit 2 and line address control unit 3 are reset by initialization.

〔Effect of the invention〕

As explained above, the present invention has a system in which a plurality of working lines including one protection line are made into a block unit, and the protection circuit can be commonly used among the blocks in a device in which a plurality of these block units are installed. Because of this structure, double faults within a block can be relieved and restart time can be shortened, and the cause of the fault can be easily isolated.

[Brief explanation of drawings]

The figure is a block configuration diagram showing the configuration of an apparatus according to an embodiment of the present invention. ■... Communication control section, 2... Status management section, 3... Line address control section, 4... Line correspondence section, 11... Switching control section, 12... Address setting section, 13 . . . n to l switching unit, 14 . . . Working line connection circuit, 15 . . . Protection line connection circuit, 21 . . . Upper device interface,
22... Line interface, 23... Interface between line corresponding parts.

Claims (1)

[Claims] (1) A host device is connected to multiple line support units via one communication control unit, each line support unit accommodates multiple lines, and one or more of the multiple lines is assigned as a working line. , one or a small number of the plurality of lines are allocated as a protection line, and each line corresponding unit includes a communication control unit that switches the connection with the communication control unit to the protection line when there is a failure in the working line. In the equipment, means for inputting information about line switching of each line handling unit and identifying that a fault has occurred in the line of that line handling unit when all the backup lines of one line handling unit are in use. A communication control device comprising: a control means for controlling the communication control unit to connect a signal connected to the line where the failure has occurred to a backup line of another line corresponding unit.