JP3148301B2 - Line switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line switching device for backing up a dedicated line when a failure occurs in the dedicated line.

[0002]

2. Description of the Related Art In a conventional line switching device, conditions for determining a failure of a dedicated line are stored in a memory in advance, and when it is recognized that an abnormality has occurred in the dedicated line, the memory is referred to. Failure determination, and backup control of the communication line is performed based on the determination result.

Incidentally, such a technique is disclosed in
No. 231534.

[0004]

In the above prior art, conditions for determining a failure of a dedicated line are predetermined.
It is not easy to change the conditions for the determination. Therefore, the usage on the user side has been limited.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a line switching apparatus capable of detecting a failure in various cases and performing more flexible backup control.

[0006]

Means for Solving the Problems The present invention is a line switching device that switches a communication line to a public line when a dedicated line has a failure, and is capable of determining a failure with one or more of a plurality of elements, Selecting means for selecting at least one of the plurality of elements as a condition for judging a failure; storing means for storing the element selected by the selecting means as a fault judging condition; Control means for switching the communication line from the leased line to the public line when the failure of the leased line is determined based on the condition.

[0007]

[Operation] From an input means for inputting a condition for judging a failure,
A desired condition can be input, and the condition is stored in a table. The control means determines a failure of the leased line based on the contents stored in the table, and switches the communication line from the leased line to the public line when a failure occurs.

Thus, a failure can be detected in various cases, and backup control with a higher degree of freedom becomes possible.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

§1. System Configuration FIG. 1 is a diagram showing a system configuration to which the line switching unit of the present invention. In FIG. 1, a line switching device (LSC
-A) 10 connects two data terminal devices (DTEs) 11 and 12 and two modem devices 13 and 14. The line switching device 10 is connected to the ISDN network 30. On the other hand, the line switching device (LSC-B) 20
Connects two data terminal devices (DTEs) 21 and 22 and two modem devices 23 and 24, like the line switching device 10. Also, the line switching device 20 is an IS
It is connected to the DN network 30.

The modem device 13 connected to the line switching device 10 is connected to the modem device 24 connected to the line switching device 20 via a dedicated line 31. Similarly, the modem device 14 and the modem device 23 are dedicated. They are connected by a line 32.

The ISDN network 30 and the line switching device 10
Lines 33 and 34 between the two 64 Kb
This is a so-called ISDN basic interface of 2B + D composed of a communication channel (B channel) having a communication speed of ps and one control channel (D channel) having a communication speed of 16 Kbps.

In such a configuration, in a normal state, the data terminal device 11 is connected to the data terminal device via the line switching device 10, the modem device 13, the dedicated line 31, the modem device 24, and the line switching device 20. Connected to the device 22;
The data terminal device 11 and the data terminal device 22 are in a communication state.

Similarly, the data terminal device 12 includes a line switching device 10, a modem device 14, a dedicated line 32, and a modem device 2.
3, via the line switching device 20, and connected to the data terminal device 21, and the data terminal device 12 and the data terminal device 21 are in a communication state.

Here, for example, when an abnormality such as a disconnection occurs in the dedicated line 31, it is detected by either the line switching device 10 or the line switching device 20. For example, when the line switching device 10 detects an abnormality, a call is made to the ISDN network 30, and the line switching device 10 and the line switching device 20 are connected via the ISDN network 30. Thereafter, each of the line switching device 10 and the line switching device 20 performs a line switching operation. The data terminal device 11 is connected to the line switching device 1.
0, a line 33, an ISDN network 30, a line 34, and the data terminal device 22 via the line switching device 20.
Communication between the data terminal device 11 and the data terminal device 22 is performed.

As described above, when a failure occurs in the leased line, the line can be backed up using a public network such as an ISDN network.

FIG. 2 is a diagram showing a second system configuration in which a remote control device (RMC) 40 is added to the configuration shown in FIG. In FIG. 2, the remote control device 40 is connected to the ISDN network 30 by a line 35.

The remote control device 40 includes the line switching device 1
It monitors the statuses 0 and 20, monitors the status of line switching, and instructs line switching.

§2. Configuration of Line Switching Device FIGS. 3 to 6 are diagrams illustrating the line switching devices 10 and 20. FIG. FIG. 3 is a diagram showing an external view of the operation panel, and FIGS. 4 to 6 are diagrams showing a hardware configuration diagram.

2.1 Operation Panel In FIG. 3, the operation panel is provided with various buttons, lamps, and indicators. Hereinafter, this will be described in detail.

The operation panel includes a layer 1 lamp 111-1 which lights green when a layer 1 is established and a layer 2 lamp which lights green when a layer 2 is established when a call is connected to the ISDN network 30. 111-2 and the dedicated line (connection destination A) corresponding to one of the two data terminal devices connected to the device is lit green when the dedicated line (connection destination A) is in a normal state, and an abnormality occurs in the dedicated line. The dedicated line lamp 111-3 lights up in red when the dedicated line is connected, and the dedicated line corresponding to the other data terminal device (connection destination B) lights up in green when it is in a normal state, and turns red when an abnormality occurs in the dedicated line. The dedicated line lamp 111-4 lights up when the dedicated line (connection destination A) is in a normal state, lights up in green when communication is being performed on the ISDN line, and an abnormality occurs in the dedicated line. When switching to a line, switch to an ISDN line The ISDN lamp 111-5 which lights up in red when it cannot be connected, turns off when the dedicated line (connection destination B) is in a normal state, and lights up in green when communicating with the ISDN line. An error occurs and the ISDN
When switching to a line, an ISDN lamp 111-6 that lights up in red when connection to the ISDN line is not established is provided.

The operation panel has a MAINT button 110-1 used for setting the online / offline mode and for performing various state setting operations (details will be described later), and setting and confirming various states. After the end,
Clear button 110-2 used when moving to the next operation
And an execution button 1 used for setting and confirming various states
10-3 and ISD to switch from dedicated line to ISDN line
N button 110-4, dedicated line button 110-5 for switching from an ISDN line to a dedicated line, and connection for selecting a data terminal device corresponding to connection destination A among two data terminal devices connected to the device. A destination A button 110-6 and a destination B button 110-7 for selecting a data terminal device corresponding to the destination B are also provided.

Further, the operation panel is provided with a numeric keypad 110-8 used for various operations such as a dial, and a display 109-1 for displaying set contents and the like.

2.2 Hardware Configuration FIGS. 4 and 5 are diagrams showing a hardware configuration of the line switching device of the present invention, and FIG.
It is a figure which shows the part shown with in more detail. Hereinafter, these will be described.

In FIG. 4, the line switching device includes a control device (CPU) 101 for controlling the entire device, such as a microprocessor. This control device 10
1 operates based on a program stored in a fixed storage device (ROM) 102, and temporarily stores a temporary storage device (RAM).
A predetermined process and control are executed using various tables (tables indicating operation conditions and the like) stored in the memory 103 and a temporary storage area. The control device 10
1, the fixed storage device 102, and the temporary storage device 103 are connected to a bus 105, and various data are transmitted and received via the bus 105.

A clock device (RTC) is provided on the bus 105.
A clock device 104 is connected, and the clock device 104 accurately counts the date and time. Panel control unit 1
06 is also connected to the bus 105. The panel control unit 106 connects the display controller 109, the button scanner 110, the lamp driver 111, and the buzzer 112, and controls them. The display controller 109 is connected to a display (LCD) 109-1, and displays the display 1 based on information from the panel control unit 106.
Desired character information is displayed at 09-1. The button scanner 110 includes a MAINT button 110-1, a clear button 110-2, an execute button 110-3, an ISDN button 110-4, a dedicated line button 110-5, a connection destination A button 110-6, and a connection destination B button 110-. 7 and the numeric keypad 110-8, and when these buttons and numeric keys are pressed, the information is transmitted to the panel control unit 106.
Notify. The lamp driver 111 connects the layer 1 lamp 111-1, the layer 2 lamp 111-2, the dedicated line lamp 111-3, the dedicated line lamp 111-4, the ISDN lamp 111-5, and the ISDN lamp 111-6. Control (driving) to light these lamps green, red or extinguish them based on information from the panel control unit
do. Further, the buzzer 112 sounds and stops sounding based on information from the panel control unit 112.

Further, a relay driver (A) 107 and a relay driver (B) 108 are connected to the bus 105, and are controlled by the control device 101. These two relay drivers (A) 107 and relay driver (B) 108 drive a line switching relay for switching a line (either a dedicated line or an ISDN line) to which a terminal device is connected. A detailed description will be given later.

Referring to FIG. 5, the line switching device
And a line switching relay 113A corresponding to each of the connection destinations B
And 113B. This line switching relay 1
In a normal state by 13A and 113B, the terminal device (DTE) is connected to a modem device, that is, a dedicated line.

When a failure occurs in the leased line, the line switching relays 113A and 113B operate, and the terminal device (DTE) is opened to the modem and connected to the circuit for backup. On the circuit side to be backed up, first, level converters (LVC-A and LVC-B) 114A and 114
B is provided. Level converters 114A and 1
14B is for matching the voltage of the signal.

Each of the level converters 114A and 114B has a rate adaptation section (RA-A and RA-A).
B) It is connected to 115A and 115B. rate·
The adaptation units 115A and 115B are connected to the terminal device (D
It converts the communication speed of the signal received from the TE) via the level converters 114A and 114B and outputs the converted signal. For example, when the communication speed on the output side is 64 Kbps, the communication speed is set to 64 Kbps and output. Conversely, when a signal is output to the terminal device (DTE), the received signal (for example, a signal having a communication speed of 64 Kbps) is converted into the communication speed of the terminal device (DTE) and converted to the terminal device (DTE). Output to Each of the rate adaptation units 115A and 115B is connected to the bus 105, and performs a communication speed conversion operation under the control of the control device 101. This is to set the parameters of the rate adaptation units 115A and 115B according to the terminal device when an attribute including the communication speed of the terminal device to be connected is set by the initial setting described later.

Line interface unit (ISAC) 116
Are two rate adaptation sections 115A and 115A
B is connected. Also, the line interface unit 116
Is connected to the ISDN network and the bus 105
Is also connected. The line interface unit 116
The control of the layer 3 of the ISDN basic interface is performed based on the control of the control device 101. That is, ISD
Call connection processing is performed with the N network 30 based on a predetermined protocol. Also, the line interface unit 116
Data from the rate adaptation section 115A and the rate adaptation section 115B and a call control message for performing call control are multiplexed to form a so-called 2B + D
Also, it has a layer 2 function of configuring a frame having the above configuration.

The register (A) 117A is a register for monitoring the state of the line between the terminal device corresponding to the connection destination A and the modem device.
7B is a register for monitoring the state of the line between the terminal device corresponding to the connection destination B and the modem device. The register (A) 117A and the register (B) 117B are connected to the bus 105, respectively, and the control device 101 controls the register (A) 117A and the register (B) 11
7B is accessed to monitor the state of the line.

FIG. 6 is a diagram showing the circuit 50 shown in FIG. 5 in more detail. In FIG. 6, the CCI
V. of the TT Recommendation. An example is shown in which the configuration is made according to the conditions of 24 interfaces.

In FIG. 6, as indicated by reference numeral 601,
A terminal indicated by “(T)” at the end of the signal name indicates a terminal on the terminal device (DTE) side, and as indicated by reference numeral 602, indicated by “(M)” at the end. Terminals indicate terminals on the modem device side.

The signals connecting the terminal device and the modem device will be described. The SD signal is a transmission data signal, the RD signal is a reception data signal, the ER signal is a terminal ready signal, the RS signal is a transmission request signal, and the DR signal is a data set. Ready signal, C
D signal is a carrier detection signal, ST2 signal is an internal transmission timing signal, RT signal is a reception timing signal, TI signal is a test display signal, CI signal is a called display signal, ST1 signal is an external transmission timing signal, and SQD signal is a data signal. The quality detection signal, the RLB signal is a remote loopback signal, the LLB signal is a local loopback signal, and the CS signal is a transmission enable signal.

Of these various signals, the register (A)
117A includes ER signal, RS signal, DR signal, CD signal, ST2 signal, RT signal, ST1 signal, SQD signal,
And the CS signal are connected. Therefore, the state of the line can be monitored based on the state of all or some of the signals connected to the register (A) 117A (details will be described later).

All signals except for the ER signal and the RS signal are provided with line switching relays. In a normal state, the terminal device and the modem device are connected. All the line switching relays for each signal operate simultaneously, and when a failure occurs in the dedicated line, the terminal device and the level converter 114A are connected at the same time, and the rate adaptation unit 115A and the terminal device are logically connected. Connected.

The SD signal, RD signal, ER signal, R signal
S signal, DR signal, CD signal, ST2 signal, RT signal,
And other signals are omitted from the drawing, for example, the TI signal and the CI signal are fixed to the OFF state, the ST1 signal is connected to a circuit for absorbing the phase difference, and the SQD signal and the RLB The signal and the LLB signal may be terminated.

Further, in FIG. 5, the circuit indicated by reference numeral 60 has the same configuration as that of FIG.

As described above, the hardware of the line switching device is configured.

§3. Setting of Operating Conditions Next, a method of setting initial operating conditions of the line switching apparatus of the present invention and a method of confirming the set contents will be described with reference to FIGS.

3.1 Own ISDN Address Registration FIGS. 16 and 17 show the ISDN address (IS
FIG. 4 is a diagram showing a procedure for registering a DN number.

First, the main button 110 shown in FIG.
When -1 and "1" of the numeric keypad 110-8 are simultaneously pressed (1601), the control device 101
It recognizes that the MAINT button 110-1 and “1” of the numeric keypad 110-8 have been pressed simultaneously via the control panel 10 and the panel control unit 106. Then, the display indicated by reference numeral D1601 is displayed on the display device 109-1. Next, numeric keypad 11
When "1" of 0-8 is depressed (1602), similarly, the display is displayed on the display device 109-1 as indicated by reference numeral D1602, and one of the two connection destinations of the connection destination A and the connection destination B is displayed. Perform the display to be specified. Here, for example, when designating the connection destination B, the user presses the connection destination B button 110-7 (1603). Then, a display is made on the display device 109-1, as indicated by reference numeral D1603, to indicate that the connection destination B has been selected. Next, when the execute button 110-3 is pressed (1604), the currently set address is displayed on the display device as indicated by reference numeral D1604.

Here, the ten key 110-8 is operated to
A newly set address is input (1605). Note that the address is composed of an address and a sub-address, and a desired address is input using a sub-address connector. As a result, the newly set address is displayed on the display device 109-1 as indicated by reference numeral D1605. Next, when the execution button 110-3 is pressed (1606), the ISD displayed by reference numeral D1605 is displayed.
The N address is newly set. That is, the control device 1
No. 01 sets and registers the newly input ISDN address in its own ISDN address table provided in the temporary storage device 103 and corresponding to the connection destination B. And
When the registration is completed, the display device 109-1 displays the code D160.
As shown in FIG. 6, a display indicating that the registration has been completed is displayed.

3.2 Display of Own ISDN Address FIG. 18 is a diagram showing a procedure for displaying the ISDN address of the own device.

First, when the main button 110-1 and the numeric keypad 110-8 "1" are simultaneously pressed (180)
1), the control device 101 displays the code D1 on the display device 109-1.
The display 801 is displayed. Next, when "2" of the numeric keypad 110-8 is pressed (1802), the display device 109-1 is pressed.
And a display for designating one of the two connection destinations. Here, for example, when designating the connection destination A, the connection destination A button 110
Press -6 (1803). Then, the display device 109
For -1, a display indicating that the connection destination A has been selected is displayed as indicated by a reference numeral D1803. Next, an execution button 110-3
Is pressed (1804), the control device 101 reads out its own ISDN address from the own ISDN address table provided in the temporary storage device 103 and corresponding to the connection destination A, and indicates it to the display device 109-1 by reference numeral D1804. Display as follows. The code D1804 is the own ISDN.
This shows the display contents when nothing is registered in the address table.

3.3 Automatic Connection Destination ISDN Address Registration FIGS. 19 and 20 show a procedure for registering an ISDN address of a line switching device of a connection destination when backing up by an ISDN line when a failure occurs in a dedicated line. FIG.

First, when the main button 110-1 and "1" of the numeric keypad 110-8 are simultaneously pressed (190)
1), the control device 101 displays the code D1 on the display device 109-1.
901 is displayed. Next, numeric keypad 110-8
Is pressed (1902), the display device 109-
1 is displayed as indicated by reference numeral D1902, and a display for designating one of the two connection destinations is performed. Here, for example, when specifying the connection destination A, the connection destination A button 110-
6 is depressed (1903). Then, the display device 109-
1, a display indicating that the connection destination A has been selected is displayed as indicated by reference numeral D1903. Next, execute button 11
When 0-3 is pressed (1904), the display device 109-1 is pressed.
As shown in the symbol D1904, a display for designating the number of the item to be set in the automatic connection destination ISDN address table corresponding to the connection destination A is displayed. That is, a plurality of ISDN addresses can be set in the automatic connection destination ISDN address table. In addition,
When a backup request is issued from the own apparatus, a call operation is performed based on the ISDN address registered in No. 1. On the other hand, when a backup request is made from the partner device, it is determined whether the request is from a device having an ISDN address registered in the automatic connection destination ISDN address table, and only when registered, the backup request is accepted. In order to use for a security check, a plurality of registrations can be made.

When displayed as indicated by reference numeral D1904, the item number to be designated is entered by using the ten keys 110-8, and the execute button 110-3 is pressed (1905).
For example, when designating item number 1, "0" and "1" of the numeric keypad 110-8 are sequentially pressed, and then the execution button 110
Press -3. Then, the ISDN address registered in item No. 1 is displayed as indicated by reference numeral D1905.
Reference numeral D1905 indicates a case where the ISDN address is not registered. Where the desired ISDN
The address is input using the numeric keypad 110-8 in the same manner as described with reference to D1605 in FIG.
6). Then, the display device 109-1 displays the symbol D190.
The input ISDN address is displayed as shown in FIG. Next, when the execute button 110-3 is pressed (190
7), IS displayed as indicated by reference symbol D1906.
The DN address is set. That is, the control device 101
Is a connection destination A provided in the temporary storage device 103.
The newly input ISDN address is set and registered in the area of the item number 1 of the automatic connection destination ISDN address table corresponding to. When the registration is completed, the display device 1
As indicated by reference numeral D1907 at 09-1, a display indicating that the registration has been completed is displayed.

3.4 Display of Automatically Connected ISDN Address FIGS. 21 and 22 are diagrams showing the procedure for displaying the contents registered in the automatically connected ISDN address table. First, the main button 110-1 and the numeric keypad 1
Simultaneously press "1" of 10-8 (210
1). Then, the control device 101 controls the display device 109-1 to perform the display indicated by reference numeral D2101. next,
When "6" of ten keys 110-8 is pressed (21
02), a display indicating a request to select one of the two connection destinations is displayed on the display device 109-1 as indicated by reference numeral D2102. Here, for example, when selecting the connection destination A, the user presses the connection destination A button 110-6 (2
103). Then, the code | symbol D2 is displayed on the display device 109-1.
As shown at 103, a display indicating that the connection destination A has been selected is displayed. Next, when the execute button 110-3 is pressed (2104), the display device 109-1 displays the symbol D21.
Automatic connection destination ISD corresponding to connection destination A as shown in FIG.
A display for selecting an item number in the N address table is displayed. Here, a desired number is input using the numeric keypad 110-8 (2105). For example, when it is desired to display item number 1, "0" and "1" of the numeric keypad 110-8 are sequentially input. Then, the input item number is displayed on the display device 109-1 as indicated by reference numeral D2105.
Next, when the execution button 110-3 is pressed (210
6), as indicated by reference numeral D2106, item number 1 in the automatic connection destination ISDN address table corresponding to connection destination A
Displays the registered ISDN address.

3.5 RMC ISDN Address Registration FIGS. 23 and 24 are diagrams showing a procedure for registering an ISDN address of a remote control device (RMC) that remotely controls a line switching device.

First, when the main button 110-1 and the numeric keypad 110-8 "1" are simultaneously pressed (230)
1), the control device 101 displays the symbol D on the display device 109-1.
The display shown in 2301 is performed. Next, the numeric keypad 110-
When "3" of 8 is pressed (2302), the display device 109
-1 is displayed as indicated by reference numeral D2302, and a display for inputting the number of the remote control device is performed. Here, for example, when designating the number 2, the user presses “2” on the numeric keypad 110-8, and then presses the execution button 110-3 (2303). Then, on the display device 109-1,
As indicated by reference numeral D2303, a display is made indicating that the remote control device of number 2 has been designated. Note that the symbol D
In the display shown in 2303, the I of the remote control device is displayed.
The display shows that the SDN address is not set.

Next, a desired ISDN address is input by operating the numeric keypad 110-8 (2304). Then
The input ISDN address is displayed on the display device 109-1 as indicated by reference numeral D2304. next,
When the execute button 110-3 is pressed (2305), the ISDN address indicated by reference numeral D2304 is set. That is, the control device 101 stores the temporary storage device 10
The input ISDN address is set and registered in the area of No. 2 of the remote control device ISDN address table provided in 3. When the registration is completed, a display indicating that the registration is completed is displayed on the display device 109-1 as indicated by reference numeral D2305.

3.6 RMC ISDN Address Display FIG. 25 is a diagram showing a procedure for displaying the contents set in the remote control device ISDN address table.

First, the main button 110-1 and "1" of the numeric keypad 110-8 are simultaneously pressed (2).
501). Then, the control device 101 causes the display device 109
At −1, control for performing the display indicated by reference sign D2501 is performed. Next, when “4” of the numeric keypad 110-8 is pressed (2502), the symbol D25 is displayed on the display device 109-1.
As shown at 02, a display for inputting the number of the remote control device is made. Here, for example, when the content of the number 2 is displayed, “2” of the numeric keypad 110-8 is pressed, and then the execution button 110-3 is pressed (250).
3). Then, the control device 101 sets the temporary storage device 103
The control is performed to extract the ISDN address from the area of No. 2 of the remote control device ISDN address table provided therein and display it on the display device 109-1 as indicated by reference numeral D2503.

3.7 DTE Attribute Registration FIGS. 26 to 29 are diagrams showing a procedure for setting an attribute of a data terminal device (DTE) connected to the line switching device.

First, the main button 110-1 and "2" of the numeric keypad 110-8 are simultaneously pressed (2).
601). Then, the control device 101 recognizes this,
The display device 109-1 performs control for displaying as indicated by reference numeral D2601. Next, when "1" of ten keys 110-8 is depressed (2602), a display for selecting a data terminal device for which an attribute is to be registered is displayed as indicated by reference numeral D2602. This allows the user to select a data terminal device corresponding to either the connection destination A or the connection destination B. Here, for example, when setting the attribute of the data terminal device corresponding to the connection destination A, the connection destination A button 1
Press 10-6 (2603). Then, the display device 1
09-1, the connection destination A
Is displayed to the effect that the data terminal device corresponding to is selected. Here, when the execute button 110-3 is pressed (2
604), a display for designating the interface of the data terminal device is displayed on the display device 109-1 as indicated by reference numeral D2604. Here, V.1 of the CCITT recommendation is used. 24
Indicates that this is an interface.

In this state, when one of the buttons “0” to “9” of the numeric keypad 110-8 is pressed (260)
5), the display of the code D2605 changes from “V.24” to “···”.
・ ・ 」 Also here, similarly, the numeric keypad 110
When any one of the buttons “0” to “9” of “−8” is pressed, “V.24” is displayed. By pressing the numeric keypad 110-8, “V.24” and “...” are displayed. Is scrolled. Here, when "V.24" or "..." is specified and the execution button 110-3 is pressed (2606), the interface condition of the data terminal device is selected. Note that "...
Is displayed when the data terminal device is not connected.

As described above, when the interface condition of the data terminal device is selected, a display indicated by reference numeral D2606 is made. This is for setting the data format. By pressing the numeric keypad 110-8, the data formats that can be set are sequentially displayed in the same manner as described above. “SYNC” indicates synchronous format data, and “AS”
= 7, E, 1 "indicates that the data bits are 7 bits, parity is present, and the stop bit is 1 bit in an asynchronous format. There are a plurality (various types) of data formats that can be set in this way, as indicated by reference numeral D2607 in the figure. The desired data format is selected by operating the numeric keypad 110-8 (2607), and the execution button 110-3 is pressed. (26
08). Then, the data format of the displayed content is selected. At this time, the display device 109-1 displays the symbol D
It is displayed as shown at 2608 to allow the user to select the data speed. Similarly, any one of the buttons “0” to “9” of the numeric keypad 110-8 is pressed and the symbol D26 in FIG.
As shown in FIG. 09, a desired data speed is selected (26).
09), when the execute button 110-3 is pressed (261)
0), the display indicated by reference sign D2610 is displayed on the display device 109-1.
Is requested to select a transmission timing. Here, similarly, one of the buttons “0” to “9” of the numeric keypad 110-8 is pressed to select a desired transmission timing as indicated by reference numeral D2611 (2611), and the execute button 110-3 is pressed. Press (2612).

As a result, the attribute of the data terminal device displayed when the execute button 110-3 is pressed as shown by reference numeral D2611 (for example, the attribute displayed by reference numeral D2611), that is, the interface condition, data The format, data rate, and transmission timing are set. This is performed by the control device 101 setting attribute information indicating the attribute of the data terminal device displayed on the display device 109-1 in the data terminal attribute table corresponding to the connection destination A in the temporary storage device 103. You. For example, when the execution button 103 is pressed when the content indicated by the code D2611 is displayed, in the data terminal attribute table, the interface condition is “V.24”, the data format is “SYNC”, and the data speed is “ 9.6K ",
The transmission timing is set to “2”. As described above, when the setting of the attribute of the data terminal device is completed, a display indicated by reference numeral D2612 is made on the display device 109-1.

When the attribute of the data terminal device is set, the control device 101 sets the rate adaptation unit 115A or 115A based on the contents of the data terminal attribute table.
B is set, and parameters for matching the conversion of the communication speed of the signal are set.

3.8 DTE Attribute Display FIG. 30 is a diagram showing a procedure for displaying the contents stored and set in the data terminal attribute table in the temporary storage device 103.

First, the main button 110-1 and "2" of the numeric keypad 110-8 are simultaneously pressed (3).
001). Then, the control device 101 causes the display device 109
At −1, control is performed to perform the display indicated by reference sign D3001. Next, when "2" of the ten keys 110-8 is pressed (3002), the display device 109-1 displays the symbol D3.
As shown in 002, a display indicating a request to select one of the two connection destinations is displayed. Here, for example, when selecting the connection destination A, the user presses the connection destination A button 110-6 (3003). Then, a display indicating that the connection destination A has been selected is displayed on the display device 109-1 as indicated by reference numeral D3003. Next, the execute button 110-
3 (3004), the control device 101 extracts data from the data terminal attribute table corresponding to the connection destination A of the temporary storage device 103, and displays the data terminal device on the display device 109-1 as indicated by reference numeral D3004. Display the attributes of.

3.9 Dedicated Line Monitoring Start Condition Registration FIGS. 31 to 34 are diagrams showing the procedure for setting the dedicated line monitoring start condition for detecting a dedicated line failure.

First, the main button 110-1 and "2" of the numeric keypad 110-8 are simultaneously pressed (3).
101). Then, the control device 101 recognizes this,
Control is performed on the display device 109-1 to display as indicated by reference numeral D3101. Next, when "3" of the numeric keypad 110-8 is pressed (3102), a display for selecting a dedicated line for registering the failure monitoring start condition is displayed by a symbol D31.
02 is performed. Here, for example, when registering a dedicated line corresponding to the connection destination A, the connection destination A button 110-6 is pressed (3103). Then
As shown by reference numeral D3103, the display device 109-1 displays that the dedicated line corresponding to the connection destination A has been selected.

Here, when the execute button 110-3 is pressed (3104), the display device 109-1 displays the symbol D31.
As shown in FIG. 04, a display indicating the selected dedicated line and a display requesting the setting of whether to monitor the dedicated line are made. Here, when any button of the numeric keypad 110-8 is pressed (3105), the display indicated by reference numeral D3105 changes sequentially from “OFF” to “ON” and from “ON” to “OFF”. Request). Next, when the execute button 110-3 is pressed (3106),
On the display device 109-1, as indicated by reference numeral D3106,
A display requesting the input of the monitoring start time and the monitoring end time is displayed. The input of the monitoring start time and the monitoring end time is performed by the ten keys 110-8 (3107).
In the display of the symbol D3107, the inputs are “0”, “8”, “1”,
An example is shown in which “0”, “1”, “6”, “4”, and “0” are sequentially set.

Next, when the execution button 110-3 is pressed (3108), the display device 109-1 displays the symbol D310.
As shown in FIG. 9, a request is made to set whether or not to monitor the dedicated line only when the ER signal is in the ON state. Here, if any button of the numeric keypad 110-8 is pressed (3109),
The display indicated by reference sign D3109 changes from “ER-ON” to “···”.
.. "," ... "sequentially changes to" ER-ON ", so that the desired display is set. Here, "ER-O
When "N" is displayed, the dedicated line is monitored only when the ER signal is ON, and when "..." is displayed, the dedicated line is monitored regardless of the state of the ER signal. Next, when the execution button 110-3 is pressed (3110), a display requesting an input of a failure determination time is displayed on the display device 109-1 as indicated by reference numeral D3110. When any button of the numeric keypad 110-8 is pressed in this state (311
1), the display is "3", as indicated by the symbol D3111,
"5", "10", "20", "30", "40",
“60”, “180”, “300”, “420”, “6”
.., "3",..., So that the desired display is set. Next, when the execution button 110-3 is pressed (3112), the dedicated line monitoring start condition indicated by reference numeral D3111 is set. That is, the control device 101 stores, in the area of the dedicated line monitoring start condition table corresponding to the connection destination A provided in the temporary storage device 103,
Set and register the entered leased line monitoring start condition. When the registration is completed, a display indicating that the registration is completed is displayed on the display device 109-1 as indicated by reference numeral D3112.

3.10 Dedicated Line Monitoring Start Condition Display FIG. 35 is a diagram showing a procedure for displaying the contents stored and set in the dedicated line monitoring condition table in the temporary storage device 103.

First, the main button 110-1 and "2" of the numeric keypad 110-8 are simultaneously pressed (3).
501). Then, the control device 101 causes the display device 109
At −1, control for performing the display indicated by reference sign D3501 is performed. Next, when "4" of the numeric keypad 110-8 is pressed (3502), the display device 109-1 displays the symbol D3.
As shown at 502, a display indicating a request to select one of the two connection destinations is displayed. Here, for example, when selecting the connection destination A, the user presses the connection destination A button 110-6 (3503). Then, a display indicating that the connection destination A has been selected is displayed on the display device 109-1 as indicated by reference numeral D3503. Next, the execute button 110-
When the user presses 3 (3504), the control device 101 extracts data from the dedicated line monitoring condition table corresponding to the connection destination A of the temporary storage device 103, and displays the dedicated line on the display device 109-1 as indicated by reference numeral D3504. Displays monitoring conditions.

3.11 Dedicated Line Monitoring Method Registration FIGS. 36 to 41 are diagrams showing a procedure for setting a signal line to be monitored when detecting a failure in the dedicated line (dedicated line monitoring method registration).

First, the main button 110-1 and "2" of the numeric keypad 110-8 are simultaneously pressed (3).
601). Then, the control device 101 recognizes this,
Control is performed to cause the display device 109-1 to display as indicated by reference numeral D3601. Next, when "5" of the numeric keypad 110-8 is pressed (3602), a display for selecting a dedicated line for registering a dedicated line monitoring method is displayed by a symbol D36.
02 is performed. For example, when registering a dedicated line corresponding to the connection destination A, the connection destination A button 110-6 is pressed (3603). Then, as indicated by reference numeral D3603, a display indicating that the dedicated line corresponding to the connection destination A has been selected is displayed on the display device 109-1.
Next, when the execution button 110-3 is pressed (360
4), the name of the signal line (ER signal) is displayed on the display device 109-1 as indicated by reference numeral D3604.

In this state, when any button of the numeric keypad 110-8 is pressed (3605), the contents displayed under the name of the signal line are sequentially displayed as "-", "R", and "C". Is done. "-" In the display means that no monitoring is performed, "R" means that the content of the failure is recorded (logging) and backup control is performed when a failure occurs,
“C” means that when a failure occurs, a process of recording only the content of the failure is performed. Therefore, a desired process is selected by the ten keys 110-8. When the selection is completed, the execute button 110-3 is pressed (3606).
Then, as shown by reference numeral D3606, a display for selecting a method of monitoring the RS signal is displayed on the display device 109-1. This is also the same as the numeric keypad 11 described above.
The user presses 0-8 (3607), selects the desired processing content, and presses the execute button 110-3 (3608).
Then, similarly, the DR signal, the CS signal, the CD signal, the S signal
The monitoring method for the QD signal, the ST1 signal, and the RT signal is set (3609 to 3619), and the execution button 1
10-3 is pressed (3620).

Then, the control device 101 operates the display device 10
9-1 (for example, reference numeral D3619)
The dedicated line monitoring method is set based on the contents shown in (1).
This is performed by setting and registering the contents input in the dedicated line monitoring method table corresponding to the connection destination A provided in the temporary storage device 103. When the registration is completed, a display indicating that the registration is completed is displayed on the display device 109-1 as indicated by reference numeral D3620.

3.12 Dedicated Line Monitoring Method Display FIG. 42 is a diagram showing a procedure for displaying the contents stored and set in the dedicated line monitoring method table in the temporary storage device 103.

First, the main button 110-1 and "2" of the numeric keypad 110-8 are simultaneously pressed (4).
201). Then, the control device 101 displays the display device 109-
1 controls to perform the display indicated by reference numeral D4201.
Next, when "6" of the numeric keypad 110-8 is pressed (4202), the code D420 is displayed on the display device 109-1.
As shown in FIG. 3, a display indicating a request to select one of the two connection destinations is made. Here, for example, when selecting the connection destination A, the user presses the connection destination A button 110-6 (4203). Then, a display indicating that the connection destination A has been selected is displayed on the display device 109-1 as indicated by reference numeral D4203. Next, when the execution button 110-3 is pressed (4204), the control device 101 extracts data from the dedicated line monitoring method table corresponding to the connection destination A of the temporary storage device 103, and displays the data as indicated by reference numeral D4204. The content of the dedicated line monitoring method is displayed on the device 109-1.

3.13 Registration of Master-Slave Relationship FIGS. 43 and 44 register the relationship (master-slave relationship) of the initiative of backup control when a failure occurs in the leased line in the system configuration shown in FIG. It is a figure showing a procedure.

First, the main button 110-1 and "3" of the numeric keypad 110-8 are simultaneously pressed (4).
301). Then, the control device 101 displays the display device 109-
1 controls to perform the display indicated by reference numeral D4301.
Next, when "1" of the numeric keypad 110-8 is pressed (4302), a display meaning registration of the master-slave relationship is displayed on the display device 109-1 as indicated by reference numeral D4302. Next, when the execute button 110-3 is pressed, the code D
A display is made as shown in 4303. Here, when any button of the numeric keypad 110-8 is pressed (430)
4), the content of the display is “MA
Since "STAR" changes sequentially to "SLAVE" or "SLAVE" to "MASTER", a desired condition is selected and the execution button 110-3 is pressed (4305).
Then, the selected condition is set as indicated by reference numeral D4304. That is, the control device 101 stores, in the area of the master-slave relationship table provided in the temporary storage device 103,
Set and register conditions for master-slave relationships. Next, when the registration is completed, a display indicating that the registration is completed is displayed on the display device 109-1 as indicated by reference numeral D4305.

The line switching device set to “MASTER” immediately controls the backup when a failure occurs, and the line switching device set to “SLAVE” sets the backup after a certain period of time. Perform control.
By performing such processing, transmission collision is prevented, and if the MASTER side cannot perform transmission for backup control due to some kind of failure, transmission for backup control is performed from the SLAVE side.

3.14 Master-Slave Relationship Display FIG. 45 is a diagram showing a procedure for displaying the contents stored and set in the master-slave relationship table in the temporary storage device 103.

First, the main button 110-1 and "3" of the numeric keypad 110-8 are simultaneously pressed (4).
501). Then, the control device 101 causes the display device 109
At −1, control for performing the display indicated by reference sign D4501 is performed. Next, when "2" of the numeric keypad 110-8 is pressed (4502), the display device 109-1 displays the symbol D4.
As shown at 502, a display indicating that the master-slave relationship has been selected is displayed. Subsequently, when the execute button 110-3 is pressed (4
503), the control device 101 extracts data from the master-slave relationship table in the temporary storage device 103, and
The master-slave relationship set on the display device 109-1 is displayed as shown in FIG.

3.15 Backup Control Registration FIGS. 46 and 47 are diagrams showing a procedure for setting a backup control method.

First, the main button 110-1 and "3" of the numeric keypad 110-8 are simultaneously pressed (4).
601). Then, the control device 101 causes the display device 109
For −1, control is performed so that the display indicated by reference numeral D4601 is performed. Next, when "3" of the numeric keypad 110-8 is pressed (4602), a display indicating that the backup control is selected is displayed on the display device 109-1 as indicated by reference numeral D4602. Then, an execute button 110-
When 3 is pressed (4603), a display is made as shown by reference numeral D4603, and a selection of a backup control method is requested. Here, when one of the buttons of the numeric keypad 110-8 is pressed (4604), the display contents are "BACK UP" and "REP" as indicated by reference numeral D4604.
"ORT", "...", "BACK UP", ...
And so on, so select the desired control method. Subsequently, when the execution button 110-3 is pressed (46
05), the selected contents are stored in the backup control table in the temporary storage device 103 as a backup control method.

If "BACK UP" is selected, the line switching device automatically performs backup control when a failure occurs in the leased line. When "REPORT" is selected, when a failure occurs in the leased line, the line switching device connects a call to the remote control device and controls the remote control device to notify the failure of the leased line to the remote control device. Do. When "..." is selected, the line switching device performs control to simply notify that a failure has occurred when a failure occurs in the dedicated line. Therefore,
When "REPORT" and "..." are set, when a failure occurs in the dedicated line, the line is manually switched by operating the maintenance panel or the line is instructed from the remote control device. Switching is performed.

3.16 Backup Control Display FIG. 48 is a diagram showing a procedure for displaying the contents stored and set in the backup control table in the temporary storage device 103.

First, the main button 110-1 and "3" of the numeric keypad 110-8 are simultaneously pressed (4).
801). Then, the control device 101 causes the display device 109
At −1, control for performing the display indicated by reference sign D4801 is performed. Next, when "4" of the numeric keypad 110-8 is pressed (4802), the display device 109-1 displays the code D4.
As indicated by reference numeral 802, a message indicating that backup control has been selected is displayed. Subsequently, when the execution button 110-3 is pressed (4803), the control device 101 causes the temporary storage device 1
03 is extracted from the backup control table in the display device 109-1 as indicated by reference numeral D4803.
Displays the backup control method set in.

3.17 Clock Setting FIGS. 49 and 50 show the clock device (RT) of the line switching device.
FIG. 5C is a diagram showing a procedure for setting a time in C) 104 (FIG. 4).

First, the main button 110-1 and "5" of the numeric keypad 110-8 are simultaneously pressed (4).
901). Then, the control device 101 causes the display device 109
-1 is controlled, and the display indicated by reference numeral D4901 is performed. Next, when "1" of the numeric keypad 110-8 is pressed (4902), the display content of the display device 109-1 becomes as indicated by reference numeral D4902. Next, execute button 110
When -3 is pressed (4903), a display requesting setting of the date and time is displayed on the display device 109-1 as indicated by reference numeral D4903. Here, the date and time are input using the numeric keypad 110-8 (4904). For example, '91
If you set 19:32 on April 20th, "9",
"1", "0", "4", "2", "0", "1",
"9", "3", and "2" are sequentially input. Code D4
Reference numeral 904 indicates the state of the display content after the input. Subsequently, when the execute button 110-3 is pressed (49
05), the input date and time are set. That is, control device 101 transfers the input date and time to clock device 104 and performs control for operating the clock device.

Thereafter, the clock device 104 operates independently to count the time and day.

3.18 Clock Display FIG. 51 is a diagram showing a procedure for displaying the current date and time.

First, the main button 110-1 and "5" of the numeric keypad 110-8 are simultaneously pressed (5).
101). Then, the control device 101 causes the display device 109
−1 is indicated by reference numeral D5101. Next, when "2" of the numeric keypad 110-8 is pressed (510
2) The content displayed on the display device 109-1 is a code D
It changes as shown in 5102. Then, the execution button 11
When 0-3 is pressed (5103), the control device 101
The clock device 104 is accessed to read the current date and time data. Then, the read date and time data are displayed on the display device 109-1 as indicated by reference numeral D5103.

3.19 Error Logging FIG. 52 is a diagram showing a procedure for displaying the contents of an error that has occurred in the past.

In the configuration shown in FIGS. 1 and 2, when the line switching device detects a failure in the leased line, it performs backup control. In addition to the backup control, the content and occurrence of the failure Is stored in an error table in the temporary storage device 103. Therefore, the content shown in FIG. 52 shows the procedure for displaying the content of the fault stored in the error table on the display device 109-1.

In FIG. 52, when the user presses the MAINT button 110-1 and “4” of the numeric keypad 110-8 at the same time (5201), the control device 101 causes the display device 109-1 to display the content indicated by reference numeral D5201. Is displayed. Next, when "2" of the numeric keypad 110-8 is pressed (5202), the display content of the display device 109-1 changes as indicated by reference numeral D5202. Subsequently, when the execution button 110-3 is pressed (5203), the control device 101
Extracts data from the error table in the temporary storage device 103, and displays error information including the management number, the error code, and the date and time of occurrence on the display device 109-1 as indicated by reference numeral D5203. Here, the execution button 110-3
When the button is continuously pressed, the management number changes (decreases by one), and error data is sequentially displayed. The display order is configured to be the newest order of occurrence of the failure. Thus, the state of the dedicated line can be monitored and checked at any time.

§4. Backup Control 4.1 Fault Detection FIG. 12 is a flowchart showing an operation for the control device 101 to detect a fault in the leased line.

First, the control device 101 accesses the I / O of a signal to be monitored and reads the signal into an internal register (step 1201).

That is, the control device 101 reads data from the register (A) 117A or the register (B) 117B. FIG. 13 is a diagram showing the state of the read operation. Data indicating the state of each signal line stored in the register (A) 117A is read into an internal register of the control device 101.

Next, the control device 101 checks the read data to determine whether or not a failure has occurred (step 1202).

That is, when the read data indicates that the state of the signal line is "OFF", it is recognized that a failure (abnormal) has occurred. Since a signal that has caused a failure may cause a failure of another signal, a signal that is not the root signal of the failure may be determined as the root signal of the failure. Therefore, according to the present invention, when a monitoring target signal is monitored, when a failure occurs, the presence or absence of the failure is checked from a signal that is highly likely to induce a failure of another signal. FIG. 14 is a diagram showing the check order, in which the ER signal, the DR signal, and the RS
Signal, CS signal, CD signal, ST1 / ST2 signal, RT
The signal and the SQD signal are checked in this order.

As described above, when the signal lines are checked, and as a result it is recognized that a fault has occurred, the dedicated line monitoring method table is referred to and the faulty signal line is the monitored signal line. Determine if there is. As a result, if it is out of the monitoring target, the failure is ignored. In the case of a signal line to be monitored, if logging is set, the content of the fault is recorded in an error table, and if line switching is set, the content of the fault is stored in an error table. And backup control is performed.

When the occurrence of a failure is identified, the dedicated line monitoring condition table is also referred to in parallel with the reference to the dedicated line monitoring method table, and the contents of the dedicated line failure are included in the monitoring conditions. Is determined.

That is, it is first determined from the dedicated line monitoring start condition table stored in the temporary storage device 103 whether the setting for monitoring the dedicated line has been made. Here, if the condition for not monitoring is set, the failure is ignored. On the other hand, when the condition for monitoring the leased line is set, the time data is read from the clock device 104 to determine whether or not it is during the monitoring time. If it is not during the monitoring time, the failure is ignored. If it is during the monitoring time, it is determined whether the failure is determined only when the condition of the ER signal is “ON”. Finally, it is determined whether a failure has occurred continuously during the failure determination time. If a failure has occurred continuously during the determination time, it is recognized that a failure has occurred in the dedicated line.

As described above, it is determined by the dedicated line monitoring method table whether the signal line is a signal line to be monitored, and the dedicated line monitoring condition table is used to determine whether to monitor, the monitoring time condition, and the ER signal condition. , And whether or not the condition of the fault determination time is satisfied, and the occurrence of the fault of the dedicated line is identified.

FIG. 15 is a diagram for explaining an example of an operation in which the line switching device detects a failure in the leased line. FIG.
In the example 5, the condition for detecting a failure when the ER signal is “ON” is set as an example, and the signal to be monitored is a CD signal.

In FIG. 15, the time denoted by reference numeral 1501 is
Although the ER signal is “ON” and the CD signal is “OFF”, no fault is detected because it is not in the monitoring time zone. Further, reference numeral 1502 indicates that the ER signal is “ON” and the fault is in the monitoring time zone, but no fault is detected because the fault does not continue until the fault determination time. In reference numeral 1503, R
Although the S signal becomes “OFF” and an abnormality is found in the dedicated line, no failure is detected because the RS signal is not a signal to be monitored.

In the reference numeral 1504, the ER signal is in the “ON” state and the CD signal is in the failure determination time (T
1) Since "OFF" continues during the operation, it is recognized that a failure has occurred in the dedicated line. Then, the line switching device performs a backup control process.

4.2 Backup Control 4.2.1 Backup Control by Automatic Switching The operation of the backup control in the system configuration shown in FIG. 1 will be described below with reference to the flowcharts of FIGS.

In FIG. 1, the line switching device 10
(LSC-A) on the MASTER side, and the line switching device 2
0 (LSC-B) is the SLAVE side.

First, when the control device 101 of the LSC-A recognizes that a failure has occurred in the dedicated line (for example, the dedicated line on the connection destination A side) according to the procedure described in the previous section (70).
1) The buzzer 102 is controlled via the panel control unit 106 to make the buzzer sound continuously (702). Next, the line interface unit 116 is controlled to make a call to the ISDN (903). The call destination at this time is determined by the call destination stored in the automatic connection destination table. on the other hand,
Upon recognizing the incoming call from LSC-A, LSC-B determines whether the address included in the incoming call information is stored in the automatic connection destination ISDN address table, and performs a security check (704). If the security check is OK, a normal response is made (705). Then, the LSC-A analyzes the contents of the response information and determines whether or not the response is busy or no response (706). As a result of this determination, when it is determined that normal response information has been received, the relay driver (A) 107 is driven to switch the line from the dedicated line side to the ISDN network 30 side. On the other hand, in the LSC-B, the line is similarly switched to the ISDN network 30 and the buzzer is sounded continuously,
Notifies that backup control has been performed.

If LSC-A recognizes busy or no response in step 706, it performs a process of calling again. If a call cannot be set up normally via the ISDN network 30 even after performing this retry nine times (709), it is determined whether or not the address of the remote control device has been set by referring to the remote control device ISDN address table (709). 710). If the address of the remote control device is not set, the ISDN lamp 11
1-5 is lit red (717), and the buzzer sounds continuously (718) to notify that the connection of the ISDN line cannot be made normally.

On the other hand, if the address is registered in the remote control device ISDN address table in step 710, a call is made to the address (713).
As a result of calling, it is determined whether the call is busy or no response (71).
4). As a result, if it is busy or no response, the call is made again and the call can be made normally, and if the normal response information is received, it is determined whether or not the report can be made to the remote control device (715). As a result of the determination, if the report is not possible, a process of making a call again is performed.
The contents of the failure and the fact that switching to ISDN network 30 (backup control) cannot be performed normally are reported (71).
6), end the process.

When an incoming call is detected while a retry operation is being performed on the remote control device (711, 11).
712), the reporting operation to the remote control device is terminated, and the automatic backup operation is performed.

4.2.2 Backup Control by Remote Controller Next, the operation of the backup control in the system configuration shown in FIG. 2 will be described with reference to the flowcharts of FIGS. 9, 10 and 11.

First, when the LSC-A recognizes that a failure has occurred in the dedicated line (for example, the dedicated line on the connection destination A side) (901), it controls the buzzer 102 and makes the buzzer sound continuously (902). ). Next, the remote control device ISD
The address of the remote controller 40 (RMC) is extracted from the N table, and the line interface unit 116 is controlled to make a call to the address (903). On the other hand, R
The MC performs a security check using the address included in the call information (904), and responds to the call (905). In LSC-A, when a call is made, when the call is busy or no response, and when the report cannot be made to the RMC, the call operation is performed again, a normal response is received, and the report can be made to the RMC. Sometimes, (90
6, 907), set up a call, and notify the trouble (9).
08). The contents of the notification include the display of the dedicated line that is the obstacle and the details of the obstacle. When the communication of the failure ends, the LSC-A disconnects the call (9
09).

On the other hand, when the RMC receives the notification of the failure, it issues a backup control instruction automatically or manually (the operator operates the RMC). To elaborate on this,
RMC makes a call to LSC-B (91
0). Then, the LSC-B performs a security check (911) and responds to the call (9).
12). As a result, IS is established between RMC and LSC-B.
A call is set via the DN network 30. Next, RMC
Issues a line switching instruction to the LSC-B automatically or manually (913), and disconnects the call (914).

Also, in the LSC-B, when the line switching is instructed from the RMC, the line interface unit 116 is controlled and a call is made to the LSC-A (915). On the other hand, upon detecting the incoming call, the LSC-A performs a security check (916) and responds to the incoming call (917). Also, after making a call to LSC-A, LSC-B checks whether LSC-A is busy or LSC-A.
It is determined whether there is no response from A (918), and when a normal response is received, the line is backed up (91).
9). In the case of a busy or no response, a call (retry) is made again. At the ninth retry (92
0), the LSC-B makes a call to the RMC and performs a process for reporting an alarm to the RMC indicating that backup cannot be performed normally. To explain this in detail, LSC
-B first makes a call to the RMC (92
1). Then, the RMC detects the incoming call, performs a security check (922), and responds to the incoming call (923). After making the call, the LSC-B determines whether the RMC is busy or there is no response from the RMC (924). If the RMC is busy or no response, the LSC-B performs the calling operation again. On the other hand, when a normal response is received, it is determined whether the report is possible to the RMC (925). If the report is not possible, the calling operation is performed again. When the call is set up normally, R
An alarm report indicating that backup cannot be performed is sent to the MC (926), and the process ends.

When a failure occurs in the leased line,
A line backup operation (control) is performed.

§5. Conclusion As described above, according to the present invention, it is possible to provide a line switching device capable of detecting a failure in various cases and performing backup control with a high degree of freedom.

[0116]

According to the present invention, failure detection of a dedicated line can be performed under various conditions (signal line conditions to be monitored, monitoring time conditions,
Failure determination time, etc.), and can flexibly respond to the purpose of use of the user.

[Brief description of the drawings]

FIG. 1 is a first system configuration diagram illustrating an embodiment of the present invention.

FIG. 2 is a second system configuration diagram illustrating an embodiment of the present invention.

FIG. 3 is a configuration diagram showing an operation panel of the line switching device.

FIG. 4 is a hardware configuration diagram of a line switching device (1/2).
It is.

FIG. 5 is a hardware configuration diagram of a line switching device (2/2).
It is.

FIG. 6 is a diagram illustrating details of a hardware configuration of the line switching device.

FIG. 7 is a diagram (1/2) for explaining the operation of the first backup control;

FIG. 8 is a diagram (2/2) for explaining the operation of the first backup control;

FIG. 9 is a diagram (1/3) for explaining the operation of the second backup control;

FIG. 10 is a diagram (2/3) for explaining the operation of the second backup control;

FIG. 11 is a diagram (3/3) for explaining the operation of the second backup control;

FIG. 12 is a flowchart illustrating a method for monitoring a dedicated line.

FIG. 13 is a diagram illustrating a method for monitoring a dedicated line.

FIG. 14 is a diagram illustrating a method for monitoring a dedicated line.

FIG. 15 is a time chart illustrating a method for monitoring a dedicated line.

FIG. 16 is a diagram (1/2) illustrating a procedure for registering an ISDN address of a line switching device;

FIG. 17 is a diagram (2/2) showing a procedure for registering the ISDN address of the line switching device.

FIG. 18 is a diagram showing a procedure for displaying an ISDN address of a line switching device.

FIG. 19 is a diagram (1/2) illustrating a procedure for registering an ISDN address of a connection destination for backing up a line.

FIG. 20 is a diagram (2/2) showing a procedure of registering a connection destination ISDN address for backing up a line.

FIG. 21 is a diagram (1/2) showing a procedure for displaying an ISDN address of a connection destination for backing up a line;

FIG. 22 is a diagram (2/2) showing a procedure for displaying an ISDN address of a connection destination for backing up a line.

FIG. 23 is a diagram (1/2) illustrating a procedure for setting an ISDN address of a remote control device.

FIG. 24 is a diagram (2/2) showing a procedure for setting an ISDN address of the remote control device.

FIG. 25 is a diagram showing a procedure for displaying the ISDN address of the remote control device.

FIG. 26 is a diagram (1/4) illustrating a procedure for setting an attribute of a data terminal device connected to the line switching device.

FIG. 27 is a diagram (2/4) illustrating a procedure for setting an attribute of a data terminal device connected to the line switching device.

FIG. 28 is a diagram (3/4) illustrating a procedure for setting the attribute of the data terminal device connected to the line switching device.

FIG. 29 is a diagram (4/4) illustrating a procedure for setting the attribute of the data terminal device connected to the line switching device.

FIG. 30 is a diagram showing a procedure for displaying an attribute of a data terminal device connected to the line switching device.

FIG. 31 is a diagram (1/4) showing a procedure for setting a monitoring condition for a dedicated line;

FIG. 32 is a diagram (2/4) illustrating a procedure for setting a monitoring condition for a dedicated line.

FIG. 33 is a diagram (3/4) showing the procedure for setting the monitoring condition of the dedicated line.

FIG. 34 is a diagram (4/4) showing the procedure for setting the monitoring condition of the dedicated line.

FIG. 35 is a diagram showing a display for setting a monitoring condition for a dedicated line.

FIG. 36 is a diagram (1/6) showing a procedure for setting a signal line to be monitored among the dedicated lines.

FIG. 37 is a diagram (2/6) illustrating a procedure for setting a monitoring target signal line among the dedicated lines.

FIG. 38 is a diagram (3/6) illustrating a procedure for setting a monitoring target signal line among the dedicated lines.

FIG. 39 is a diagram (4/6) illustrating a procedure of setting a monitoring target signal line among the dedicated lines.

FIG. 40 is a diagram (5/6) illustrating a procedure of setting a monitoring target signal line among the dedicated lines.

FIG. 41 is a diagram (6/6) illustrating a procedure for setting a monitoring target signal line among the dedicated lines.

FIG. 42 is a diagram showing a procedure for displaying a monitoring target signal line among dedicated lines.

FIG. 43 is a diagram (1/2) illustrating a procedure for setting the relationship (master-slave relationship) of the initiative of backup control.

FIG. 44 is a diagram (2/2) showing a procedure for setting the relationship (master-slave relationship) of the initiative of backup control.

FIG. 45 is a diagram showing a procedure for displaying a relationship (master-slave relationship) of the initiative of backup control.

FIG. 46 is a diagram (1/2) illustrating a procedure for setting a backup control method;

FIG. 47 is a diagram (2/2) illustrating a procedure for setting a backup control method;

FIG. 48 is a diagram showing a procedure for displaying a backup control method.

FIG. 49 is a diagram (1/2) illustrating a procedure for setting the date and time in the line switching device.

FIG. 50 is a diagram (2/2) illustrating a procedure for setting the date and time in the line switching device.

FIG. 51 is a diagram showing a procedure for displaying the date and time on the line switching device.

FIG. 52 is a diagram showing a procedure for displaying the content of an error that has occurred in the past.

[Explanation of symbols]

10, 20 ... line switching device, 11, 12, 21, and 2
2 ... data terminal equipment, 13, 14, 23 and 24 ... modem equipment, 30 ... ISDN network, 31, 32 ... dedicated line, 3
3, 34, and 35: an ISDN line; 40: a remote control device.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04L 1/22 H04B 1/74 H04L 29/14

Claims (1)

(57) [Claims] 1. A time-only line is failed, the switching example the communication line to the public line, one or more the fault-format among a plurality of elements
A line switching device that can determine
Selection means for selecting <br/> at least any one, selected elements in the selection means failure of the plurality of elements
Storage means for storing as a determination condition, the serial in the storage means
Determining the failure of the dedicated line based on 憶conditions, dedicated line
A switching unit that switches a communication line from a dedicated line to a public line when it is determined that the communication line is a failure .