JPS62261241A - Line switching system - Google Patents

Abstract

PURPOSE:To eliminate a line switching control device and to relieve the load of a host computer by using a maintenance supervisory subsystem applying supervisory control of each section in a communication control equipment so as to apply active/standby changeover of the communication control equipment. CONSTITUTION:The communication control equipment 1a is defined as the active equipment and the control equipment 1b is defined as the standby equipment in the initial state. A maintenance supervisory sub-system (MOSS) 2a connects a line changeover switch 8 and the control equipment 1a via an interface 4a in the initial state, and the MOSS 2b applies the control to disconnect the equipment 1b and the switch 8 via the interface 46. When the MOSS 2a detects a fault of the equipment 1a during the operation, it informs the connection command due to the occurrence of a fault to the MOSS 2b to disconnect the equipment 1a from the switch 8. The MOSS 2b connects the equipment 1b to the switch 8 based on the command from the MOSS 2a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] A maintenance/monitoring subsystem that monitors and controls each part within the communication control device is used to switch between active and standby communication control devices.

[Industrial application field]

The present invention relates to a switching method for a line changeover switch, and more particularly to a line switching method in which switching control is automatically executed by a maintenance monitoring subsystem that monitors and controls a communication control device.

[Conventional technology]

FIG. 3 is a diagram illustrating a working/standby switching system of a conventional communication control device. In FIG. 3, 1a and 1b are standby communication control devices, 2' is an LSW switching control device, 7 is a host computer, and 8 is a line changeover switch. The host computer 7 monitors the current communication control device 1a, and when a failure of the current communication control device 1a is detected, the L
A switching instruction is issued to the SW switching control device 2'. The LSW switching control device 2' switches the line changeover switch 8 according to instructions from the host computer 7.

[Problem to be solved]

The conventional method shown in Figure 3 requires an LSW switching control device, which increases the hardware size, and the host computer monitors the communication control device, which increases the burden on the post computer. have.

The present invention was created in view of these points, and aims to provide a line switching method that can eliminate the LSW switching control device and reduce the burden on the host computer. .

[Means for solving problems]

FIG. 1 is a diagram showing an outline of one embodiment of the present invention. 1st
In the figure, 2a and 2b are maintenance monitoring subsystems, 3 is an interface between the maintenance monitoring subsystems, and 4a and 4b.
is an interface between the maintenance monitoring subsystem and the line changeover switch, 5a and 5b are line interfaces, 6a and 6
b is an interface between the communication control device and the host computer, CA is a channel adapter, CC is a central control device,
MS is memory, C8 is line scanning mechanism, LUT is line scanning mechanism,
Each unit is shown.

Communication control devices 1a and 1b have the same structure, and maintenance monitoring subsystems 2a and 2b also have the same structure.

One of the communication control devices 1a and 1b is in use, and the other is in reserve. Maintenance monitoring subsystem 2a
is for maintenance and monitoring of the corresponding communication control device 1a, including a function to detect the occurrence of a failure in the communication control device 1a, a function to communicate with the maintenance and monitoring subsystem 2b of the other party, and a function for the current use for the line changeover switch 8. It has functions such as performing backup switching control. Maintenance monitoring subsystem 2b
The maintenance monitoring subsystem 2a also has the same functions as the maintenance monitoring subsystem 2a.

Interface 3 connects maintenance monitoring subsystems 2a and 2b
is installed between. The maintenance monitoring subsystem 2a controls the line changeover switch 8 through the interface 4a, and similarly, the maintenance monitoring subsystem 2b controls the line changeover switch 8 through the interface 4b. Line interfaces 5a and 5b are each a bundle of n lines.

In the initial state, the communication control device 1a is defined as the active device, and the communication control device 1b is defined as the backup device. In the initial state, the maintenance monitoring subsystem 2a connects the line changeover switch 8 and the communication control device 1a via the interface 4a, and the maintenance monitoring subsystem 2b connects the communication control device 1b and the line switch 8 via the interface 4b. control to separate. When the maintenance monitoring subsystem 2a detects a failure in the communication control device 1a during operation, the maintenance monitoring subsystem 2a
Communication control device 1 notifies connection instruction due to the occurrence of a failure to
a from the line changeover switch 8.

The maintenance monitoring subsystem 2b is the maintenance monitoring subsystem 2
Based on the instruction from a, the communication control device 1b is connected to the line changeover switch 8.

FIG. 2 is a diagram showing details of one embodiment of the invention. Second
In the figure, 10 is an error detection circuit, 11 is a holding register, 12 is a decoder, 13 to 16 are flip-flops, 17 to 20 are AND circuits, 21a and 21b are interrupt reception/sending control circuits, and 22a and 22b are control addresses. Creating circuits, 23a and 23b are control data creating circuits, 24
a and 24b are switching instruction control circuits, 25a and 25b are drivers, 26a and 26b are AND circuits, 27a and 27b are flip-flops, 28 is also a flip-flop, 29 is a drive circuit, and 30 is a changeover switch. It shows.

The error detection circuit 10 detects errors within the communication control device la. Errors detected by error detection circuit 10 are held in holding register 11. The error in the holding register 11 is selected by a selector,
The selected error signal is set in the flip-flop 13 when the AND circuit 17 outputs an on signal.

The error signal in flip-flop 13 is signal ITR
It is sent as I to the interrupt reception and transmission control circuit 21a of the maintenance monitoring subsystem 2a. Decoder I2 decodes control address signal MADRI from control address generation circuit 22a. The outputs of the decoders 12 are sent to corresponding AND circuits 17, 18, 19, 20, etc., respectively. Data signal M output from the control data creation circuit 23a
The DTI is sent to the communication control device 1a, and the mlJ control address signal MADI? Flip-flop 14 designated by 1
, 15, 16, etc.

The interrupt reception and transmission control circuit 21a examines the error signal ITRI from the communication control device 1a to determine whether an error has occurred. When detecting the occurrence of an error, the interrupt reception and transmission control circuit 21a outputs a request signal MO5RQI,
The control data creation circuit 23a is instructed to create connection instruction data, and the switching instruction control circuit 24a is instructed to create a disconnection instruction signal.

Upon receiving this instruction, the control data creation circuit 23a
Create connection instruction data. This connection instruction data is sent to the maintenance monitoring subsystem 2b as a data signal MO5DT. When generation of a disconnection instruction signal is instructed, the switching instruction control circuit 24a generates a disconnection instruction signal. This disconnection instruction signal is sent to the line changeover switch 8. Request signal Ho
5 tons? When the old data is received, the maintenance monitoring subsystem 2b side sends the data signal MO5DT to the flip-flop 27b.
to cents. In this case, since the data signal MO3DT is connection instruction data, the switching instruction control circuit 27b creates a connection instruction signal. This connection instruction signal is sent to the line changeover switch 8. The flip-flop 28 of the line changeover switch 8 outputs a signal 5ELB when a disconnection instruction signal is sent from the maintenance monitoring subsystem 2a and a connection instruction signal is sent from the maintenance monitoring subsystem 2b. In this case, the signal 5ELA is output, and in other cases, the state is not changed. The drive circuit 29 controls the line LINE to be connected to the terminal B when the signal 5ELB is on, and controls the line LINE to be connected to the terminal A when the signal 5ELA is on. Note that the flip-flop 27a of the maintenance monitoring subsystem 2a receives the signal MO5R.
When port 2 is turned on, it takes in the data signal) 10SDT.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the LS
It is possible to switch the line changeover switch without requiring a W switching control device.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an outline of an embodiment of the present invention, FIG. 2 is a diagram showing details of an embodiment of the invention, and FIG. 3 is a diagram explaining a conventional line switching system. IL and 1b...communication control device, 2a and 2b...maintenance monitoring subsystem, 7...host computer, 8...line changeover switch. Patent Applicant Fujitsu Ltd. Representative Patent Attorney Kyotani 4 Bento 5 U Misaki 1 day 1 bow 1e singing ≧ Ita 11σ) 29-1, 1hi 1st leap

Claims (1)

[Claims] One of the two communication control devices (1) is in use, the other one is in reserve, and the current communication control device (1) and the standby communication control device (1) are connected to each other. In the active standby system of communication control equipment that is used by switching with the line changeover switch (8), the communication control equipment (1) corresponds to each communication control equipment (1).
A maintenance monitoring subsystem (2) capable of reading and writing data is provided, an interface for mutual communication is provided between the two maintenance monitoring subsystems (2), and each maintenance monitoring subsystem (2) and line selection switch (8
), and the maintenance monitoring subsystem (2) detects a failure in the corresponding communication control device (1) while the corresponding communication control device is currently in use. In this case, a connection instruction request is sent to the other party's maintenance and monitoring subsystem (2) via the mutual communication interface, and a disconnection instruction signal is sent to the line changeover switch (8) via the control interface. (b) If a connection instruction request is sent from the other party's maintenance monitoring subsystem (2) via the mutual communication interface while the corresponding communication control device is in reserve. , is configured to send a connection instruction signal to the line changeover switch (8) via the control interface, and the line changeover switch (8) receives a disconnection instruction signal from one of the maintenance monitoring subsystems (2). is configured to connect the line to the other communication control device (1) when a connection instruction signal is sent from the other maintenance monitoring subsystem (2). Line switching method.