JPS6331246A - Line switching system - Google Patents

Abstract

PURPOSE:To require no on/off of a change over switch and to reduce the number of line switching man-hour by executing the present/spare switching of the line by the command input from a system console. CONSTITUTION:The substitute line is defined by a preliminary definition command input from the system console 20 of a master station 10. Actually, when a trouble is generated in the present line, a line register for a time division multiplex communication present in the communication control part of a station to which the present line is connected by a line switching execution command input from the system console 20 of the master station 10 is initialized to make the communication unable. There-after, the substitute line is searched according to the connection constituting table of the master station 10, the time division multiplex communication line register present in the communication control part 40 of the station to which the line is connected is set to a state which can be communicated, thereby, the present/spare line switching is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a network system, and relates to a line switching method for switching a line between working and backup lines by inputting a command from a console of a master station.

[Conventional technology]

In the conventional system, a matrix circuit is provided in which multiple computers and multiple terminal devices are treated as row elements and column elements, respectively, and line switching is performed by switching the contacts.

However, this 71-helix circuit had to be changed each time a computer or terminal device was added to be connected, and there was a problem in that line switching took time.

Note that related techniques of this type include, for example, Japanese Patent Application Laid-Open No. 58-220541.

[Problems to be solved by the invention] ゛Conventional working/protection line switching requires line switching hardware such as a matrix circuit, so when the working/protection line is added, the dedicated hardware must also be changed. There was a problem that it had to be done.

An object of the present invention is to perform line switching between working and standby lines in a short time without requiring any hardware changes.

[Failure to solve the problem]

The purpose of item 1 is to define an alternative line by inputting a preliminary definition command from the system console of the master station in case the current line becomes unavailable due to a failure or maintenance. When a failure occurs in the working line, inputting a line switching execution command from the system console of the master station initializes the time division multiplex communication line register in the communication control unit of the station to which the working line is connected, making communication impossible. By searching for an alternative line from the master station's connection configuration table and setting the time division multiplex communication line register in the communication control unit of the station to which the line is connected to a communicable state. This is achieved by switching between working and protection lines.

[Effect]

Communication using the time division multiplex system is performed by setting the channel number of a channel accommodated in a frame circulating on a loop transmission path in a time division multiplex communication line register. When switching the line from active to backup, the communication partner can be changed by rewriting the channel number. Since the protection line takes over the channel number used by the working line, no communication is disabled due to double channel allocation.

〔Example〕

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

FIG. 1 is a block diagram inside the station. 1. OO is a system console input/output mechanism that controls the interface with the system console, 10]- is an FD input/output mechanism that controls the interface with the floppy disk controller (hereinafter referred to as FD device), and 110 is a command input from the system console. 120 is a command execution unit that performs command execution processing;
130 is a communication control unit that connects the station and the terminal and performs communication; 14
0 and 141 are data transmission/reception mechanisms for transmitting information and data necessary for inter-office control, i-50 is a terminal connection configuration table for the entire system, and 3.

160 indicates a terminal connected to the communication control section 130;

FIG. 2 is a diagram showing the system configuration. 1° is a master station that manages multiple general stations and transmission paths;
2o is a general station, 2o is a system console, 30 is an FD device, 4o is a communication control device (terminal from the station's perspective) that is connected to the host computer, 41° and 42 are terminals, and 50 is a redundant optical system that connects multiple stations. It is a fiber cable.

FIG. 3 is a diagram showing the configuration of a frame circulating within a duplicated optical fiber cable.

Reference numeral 142 indicates a synchronization area for each station to determine the timing of data transmission and reception, 143 indicates a control information area for transmitting information necessary for controlling each station, and 144 indicates a channel for communication between terminals.

FIG. 4 is a diagram showing the execution sequence of preliminary definition commands.

FIG. 5 is a diagram showing a connection configuration table for the entire system that exists only in the master station. 151 is 4.

Connection configuration table per terminal, 152 is the terminal address, 153 is the registration number of the terminal, 154 is the transmission channel number indicating which channel is used when transmitting data, 155 is which channel is used when receiving data. A receiving channel number indicating which channel is used, 156 is an index of a spare terminal defined by executing a preliminary definition command,
157 is the index of the currently connected partner terminal, 1.58
indicates terminal attribute information such as communication speed and connection type such as point-to-point line or multi-point line.

FIG. 6 shows an internal configuration table existing in a general station.

FIG. 7 shows the execution sequence of the line switching execution command.

FIG. 8 shows a group of line registers for time division multiplex communication. 132 is a transmission channel register that sets the channel number used when transmitting data; 1 and 33 are reception channel registers that set the channel number used when receiving data; 134 is an operation control register that controls data transmission and reception operations; 135 is the same A transmission/reception mode register 136 that controls whether the communication is within the office or monthly communication is a communication control register that turns on/off signals of control lines necessary for communication.

FIG. 9 is a diagram showing the working/protection switching operation of a point-to-point line, and FIG. 10 is a diagram showing the working/protection switching operation of a multipoint 1-line. The solid line indicates the connection state before switching, and the broken line indicates the connection state after switching.

Hereinafter, the line (hereinafter referred to as the working line) that was stretched between the terminal 41 (hereinafter referred to as the working terminal) and the communication control device 40 shown in FIG. 2 will be connected to the terminal 42 (hereinafter referred to as the backup terminal) and the communication control device A case of switching to a line connecting 40 (hereinafter referred to as a protection line) will be explained. Note that the current terminal 41 and communication control device 40 already have the transmission channel number and reception channel number in the terminal connection configuration table 151 of the master station and the terminal configuration table 159 in the station, and are currently communicating using this transmission/reception channel. Suppose there is.

When a pre-Uti definition command is input from the system console 20 shown in FIG. 2, the V
IT) Sent to T input/output mechanism 1-00. VD'"The input/output mechanism 100 fills the command into a buffer and passes the address of this buffer to the command interpretation mechanism 110. The command interpretation mechanism 110 checks the format of the command, and if the command is correct, the command execution unit 1.20 The command execution unit 120 searches the terminal connection configuration table for the active terminal and the terminal connection configuration table for the backup terminal from the terminal connection configuration table group shown in FIG. The table update mechanism 150 is instructed to set each other's terminal connection configuration table indexes in the terminal index 156. After updating the terminal connection configuration table, the table update mechanism 150 passes an update completion report to the command execution unit 120 and executes this report. The command execution unit 120 that has received the command returns a command execution completion report to the command interpretation mechanism 110.The command interpretation mechanism 110 edits the execution completion message,
7.

Pass it to the VDT input/output mechanism 100 and pass it to the VDT input/output mechanism 100.
If it is 0, this message is output to the system console and the command execution ends. After executing the preliminary definition command, if a line switching execution command is input from the system console, operations from the command input instruction to the execution instruction are performed in the same way as when the preliminary definition command is input, as shown in FIG. Upon receiving the execution instruction, the command execution unit 120 searches the terminal connection configuration table of the active terminal using the terminal address input as a parameter of the command, and searches for the terminal connection configuration table of the backup terminal using the backup terminal index 156 of the terminal connection configuration table. . Next, an instruction to set the transmission channel number 154 and reception channel number 155 in the terminal connection configuration table of the active terminal to the terminal connection configuration table of the backup terminal is sent to the table update mechanism 150, and when the update is completed, the command execution unit Return to 120. Next, an instruction to set the connected partner index 157 of the active terminal to the connected partner index 157 of the backup terminal is sent to the table update mechanism 150, and the update is completed.8.

Then, update completion is returned to the command execution unit 1.20. Next, the transmitting channel number of the active terminal is 154, and the receiving channel number is 1.
55 and an instruction to O clear the connected partner index 157 to the table update mechanism 150, and after 11'+b and table update completion γ, an update complete is returned to the command execution unit 120. When the table update is completed, an instruction to send the current terminal's terminal address 152, transmission channel number] 54, reception channel number] 55, and terminal attribute information 158 as control information to the general station A to which the current terminal is connected is sent as control information. Output to the transmitting mechanism 140. 40 sends this control information to the general station A, and after receiving it at the data receiving mechanism 141 of the general station A, the control information is sent to the command execution unit 1.20.
give it to In command execution fSI11.20, an instruction to set control information in the terminal configuration table 159 in the station is sent to the table update mechanism 150, and the table update mechanism 150
Then, control information is set in the corresponding terminal configuration table using the terminal address as an index, and a completion of setting is returned to the command execution unit 1-20.

Next, the command execution section 120 issues a disconnection instruction to the communication control section 1-30 in order to disconnect the current terminal from the line. The communication control unit 1-30 sets the transmission channel number 154 and the reception channel number 155 to an unset state, turns off the operation control register 334 that controls the communication operation, stops the communication operation, and sets the transmission channel number 154 and the reception channel number 155 to the command execution unit 1.20. Outputs cutting complete. The command execution unit 1.20 passes the disconnection processing completion report to the data transmission mechanism 140, and the transmission mechanism 140 transmits control information to the master station 10. In the master station 10, the receiving mechanism 141 receives this information, and the command execution unit 1
A register setting completion report is made on 20th. Next, for the general station Ct to which the backup terminal is connected, the terminal address 152 of the backup terminal and the transmission channel number 15 used by the working terminal
4. Reception channel number 155 and terminal attribute information 158
An instruction to send this as control information is output to the transmitting mechanism 140. [Transmission mechanism] 40 sends this control information to general station C 111
□After receiving this control information at the receiving mechanism 141 of the general station C, the control information is passed to the command execution unit 120. The command execution unit 120 sends an instruction to set the control information in the terminal configuration table [59] in the station to the table update mechanism 150, and the table update mechanism 150 sets the control information in the corresponding configuration table using the terminal address as an index. A command 1 returns setting completion to the execution unit 120. Next, the command execution unit 120 issues a connection instruction to the communication control unit 130 in order to connect the standby terminal to the line. The communication control unit 130 searches the time division multiplex communication line register of the corresponding spare terminal using the terminal address as an index from the time division multiplex communication line register group 131, and searches the transmission channel register 132 in the time division multiplex communication line register. Then, the transmitting channel number and receiving channel number that were used before the current terminal was disconnected are set in the receiving channel register 133. Thereafter, the operation control register 134 that controls one communication operation is turned on to start the communication operation, and the completion of register setting is sent to the command execution unit ]-20. The command execution unit]-20 sends the completion of switching to the transmission mechanism 40, and the transmission mechanism 140 sends control information to the master station 10. The receiving mechanism of the master station 10, ]1°141, sends control information to the command execution unit 120,
The command execution unit 120 recognizes the line switching completion and sends the line switching completion to the command interpreter i1.10. The command interpretation mechanism 110 edits the command execution completion message and sends it to the VDT person departure machine 3-00 next to the VDT.
The DT input/output mechanism outputs this message to Vr)T, completing the execution of the line switching execution command.

In the case of the multipoint line shown in FIG. 10, switching between the current line and the protection line can be performed using a similar method.

Furthermore, when switching a large number of lines at once, the lines can be switched all at once by converting the line switching command into a command procedure and executing this command procedure.

〔Effect of the invention〕

According to the present invention, the following effects can be achieved by making it possible to perform line switching between active and standby lines, which was conventionally done using a modem interface switch or the like, by inputting a command from the system console.

(1) No need to turn on/off the selector switch, so 12 times
゜Line switching man-hours can be reduced.

(2) A modem interface switch is no longer required, and a significant cost reduction can be expected.

(3) By using the command procedure function, arbitrary lines can be grouped and switched at once, improving user operability.

[Brief explanation of the drawing]

Figure 1 is a block configuration diagram within the station, Figure 2 is a system configuration diagram, Figure 3 is a configuration diagram of a frame circulating within a duplicated optical fiber cable, Figure 4 is a sequence diagram of predefined commands, 5 is a connection configuration table of the master station, FIG. 6 is a configuration table within the station, FIG. 7 is a sequence diagram of a line switching execution command, and FIG. 8 is a diagram showing the configuration of a group of line registers for time division multiplex communication. FIG. 9 is a diagram showing switching of point-to-point lines, and FIG. 10 is a diagram showing switching of multipoint lines. 10... Master station, 11... General station, 2o... System console, 40, 41.42... Terminal, 14
4... Channel, 150... Table update mechanism, 1
51...Terminal connection configuration table, 159...Terminal configuration table.

Claims (1)

[Claims] 1. In a network system in which a master station and a plurality of general stations each accommodating a terminal are connected by a common loop-shaped transmission path, and a logical line connecting the terminals via the plurality of general stations is defined, The master station defines and stores a backup line to be used as an alternative when the current line fails, and when a command instructing the master station to switch the line is input, the master station refers to the definition,
A same-line switching system characterized in that the line is switched by instructing one of the general stations to disconnect the line and instructing the other general station to set up the line.