JPH0637672A - Line switching control system - Google Patents

Abstract

PURPOSE:To prevent bad affection from spreading to another part as possible at the time of stopping the function of optional switching part and a control part concerning a line switching control system in a line switching eqipment provided with the switching parts and the control part. CONSTITUTION:The switching part 2 is provided with a first invalidataion means 100 prohibiting the informing of a switching state to the control part 3 by manual operation at the time of stopping the function of its own switching part. Then, the control part 3 is provided with a second invalidation means 200 prohibiting the transmission of switching instruction to a control part by manual operation at the time of stopping the function of its own control part and a storage means 300 holding the newest switching state informed from the switching part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line switching control system in a line switching device having a switching unit and a control unit.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing an example of a line switching device to which the present invention is applied, and FIG. 4 is a diagram showing an example of a conventional line switching control system.

In FIG. 3, 1 is a host device, 2 is a switching unit, 3 is a control unit, 4 and 5 are communication lines, 6 and 7 are signal lines, and 10 is a line switching device. A plurality of switching units 2 and a control unit 3 are provided.

In FIG. 3, two sets of switching units 2 are shown, and in FIG. 4, one set of switching units 2 is shown. Based on an instruction from the control unit 3, the switching unit 2 switches and connects the communication line 4 connecting with the higher-level device 1 to the plurality of communication lines 5, and the control unit 3 communicates with each switching unit 2. Transmit line switching instructions.

3 and 4, each switching unit 2 is provided with a switching circuit 21, a forced switching circuit 22 and a forced changeover switch 23, and the control unit 3 is provided with a switching control circuit 31. ing.

The switching control circuit 31 receives the instruction information (C) transmitted from the host device 1 via the signal line 6 and the alarm information (AL) transmitted from each switching unit 2, and performs each switching. The switching information (SW) transmitted to the unit 2 is generated.

The switching circuit 21 receives the switching information (SW) transmitted from the control unit 3 via the signal line 7, and executes the switching connection between the communication line 4 and the communication line 5. On the other hand, the compulsory switching circuit 22 compulsorily controls the switching connection between the communication line 4 and the communication line 5 based on the manual operation of the compulsory changeover switch 23.

The forced changeover switch 23 is of a so-called non-lock type, and the forced changeover circuit 22 includes the forced changeover switch 2.
Each time 3 is operated, it changes to a new switching state, and the current switching state is maintained until the forced changeover switch 23 is operated next time.

Further, each switching unit 2 has a detachable package structure, and when the arbitrary switching unit 2 is maintained, the package of the target switching unit 2 is not removed, and it is the target during that period. Although the communication line 4 and the communication line 5 accommodated in the switching unit 2 are not connected, abnormal alarm information (AL) is transmitted to the control unit 3 when the switching unit 2 is attached / detached, and an erroneous alarm information is transmitted. Switching information (SW) may be generated, and as a result, other switching unit 2 may be adversely affected.

On the other hand, the control unit 3 does not have a detachable structure like the switching unit 2, and when the control unit 3 is maintained,
Since abnormal switching information (SW) is transmitted to all the switching units 2, each switching unit 2 also stops operating normally, and the function must be stopped, and the communication line accommodated in the line switching device 10 is inevitable. Four
Communication via and 5 will also be interrupted.

[0011]

As is apparent from the above description, in the conventional line switching device, each switching unit 2
When attaching / detaching for maintenance, the control unit 3 and other switching units 2 may be adversely affected.
However, there is a problem that all the switching units 2 may be adversely affected during maintenance, and communication via the communication lines 4 and 5 accommodated in the line switching device 10 is also interrupted.

It is an object of the present invention to prevent the adverse effects on other parts from being spread as much as possible when the function of any switching part and control part is stopped.

[0013]

FIG. 1 is a diagram showing the principle of the present invention. In FIG. 1, 2 is a switching unit, 3 is a control unit, and constitutes a line switching device.

The switching unit 2 switches the communication line according to an instruction from the control unit 3 and notifies the switching state to the control unit 3, and the control unit 3 collects the switching state of the communication line notified from the switching unit 2. Then, the communication unit switching instruction is transmitted to the switching unit 2.

Reference numeral 100 is a first invalidating means provided in the switching unit 2 according to the present invention. Reference numeral 200 is a second invalidating unit provided in the control unit 3 according to the present invention. 300 is
The storage means is provided in the control unit 3 according to the present invention.

[0016]

The first invalidating means 100 prohibits the notification of the above-mentioned switching state to the control section 3 by a manual operation when the function of the self switching section 2 is stopped.

The second invalidating means 200 prohibits the transmission of the above-mentioned switching instruction to the control section 3 by a manual operation when the function of the self control section 3 is stopped. The storage unit 300 holds the latest switching state notified from the switching unit 2.

Therefore, when the function of the switching unit is stopped, there is no fear that the control unit is notified of the abnormal switching state, and when the function of the control unit is stopped, an abnormal switching instruction is transmitted to the switching unit. There is no danger of being affected, and even if the function of each part is stopped without stopping the function of the line switching device, the adverse effect on the whole line switching device will not be spread, and the reliability and maintainability of the line switching device will be greatly improved. improves.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a line switching control system according to an embodiment of the present invention. The same reference numerals denote the same objects throughout the drawings. Further, the target line switching device is as shown in FIG.

In FIG. 2, a maintenance switch 26 is provided in the switch section 8 corresponding to the switching section 2 as the first invalidating means 100 in FIG.
Is provided in the switching unit 2, a maintenance switch 35 is provided as the second invalidating unit 200 in FIG. 1 in the switch unit 8 corresponding to the control unit 3, and the gate circuit 33 is provided.
Is provided in the control unit 3, and further the storage means 3 in FIG.
The current configuration storage unit 32 and the setting circuit 34 are provided in the control unit 3 as 00.

In FIG. 2, one set of switching unit 2 and control unit 3 is shown as in FIG. 4, but one set is provided for a plurality of switching units 2 as shown in FIG. In the case where the control unit 3 is provided, the gate circuit 33 in the control unit 3 is provided.
The setting circuit 34 is provided corresponding to each switching unit 2.

While the switching units 2 and the control unit 3 are in operation, the maintenance switches 26 and 35 are both set to the cutoff state, and the arbitrary switching unit 2 or the control unit 3 is stopped for maintenance work or the like. In this case, the corresponding maintenance switches 26 and 35 are set to the conductive state.

The maintenance switch 26 is set in the signal line 8
1 through the corresponding recovery circuit 25 and gate circuit 3
3 and the setting state of the maintenance switch 35 is transmitted to the gate circuit 24, the restoration circuit 25, and the setting circuit 34 via the signal line 82.

The gate circuit 24 in the switching unit 2 is set to the conductive state when the maintenance switch 35 is set to the cutoff state, and the switching information (SW) transmitted from the control unit 3 to each switching unit 2. Is transmitted to the switching circuit 21, but when the maintenance switch 35 is set to the conductive state, it is set to the cutoff state,
Switching information (SW) transmitted from the control unit 3 to each switching unit 2
Is prohibited from being transmitted to the switching circuit 21.

The recovery circuit 25 in the switching unit 2 is provided with a recovery circuit 25 while the corresponding maintenance switch 26 is set to the cutoff state or the conduction state.
The reset signal (RS) for the forced switching circuit 22 is not generated, but when it is detected that the maintenance switch 26 that is being set to the conductive state is changed to the cutoff state, the reset signal (RS) for the forced switching circuit 22 is generated. .

The current configuration storage unit 32 in the control unit 3 stores the current switching connection status between the communication lines 4 and 5 for each switching unit 2 based on the switching information (SW) transmitted for each switching unit 2.
The gate circuit 33 in the control unit 3 is set to the conductive state when the corresponding maintenance switch 26 is set to the cutoff state, and the alarm information (A
L) is transmitted to the switching control circuit 31 in the control unit 3, but when the corresponding maintenance switch 26 is set to the conductive state, it is set to the cutoff state, and the alarm information (AL) transmitted from the corresponding switching unit 2 is transmitted. Is prohibited from being transmitted to the switching control circuit 31.

The setting circuit 34 in the control unit 3 is configured so that the current configuration information (SS) transmitted from the corresponding switching unit 2 (that is, the communication line in the switching unit 2) while the maintenance switch 35 is set to the cutoff state or the conduction state. 4 indicating the current state of the switching connection between the communication line 4 and the communication line 5] is prohibited, but the maintenance switch 35 is set to the conductive state.
When it is detected that the setting is changed to the cutoff state, the current configuration information (SS) transmitted from the corresponding switching unit 2 at the time of detection is transmitted to the switching control circuit 31 only once, and then the current configuration information (SS) is transmitted again. Prohibit transmission.

When the maintenance switches 26 and 35 are set to the cutoff state and the switching unit 2 and the control unit 3 are operating normally, the switching information (SW) transmitted from the control unit 3 to each switching unit 2 is: It is transmitted to the switching circuit 21 via the gate circuit 24 (conductive state) in the switching unit 2, and the switching circuit 21 executes the switching connection of the communication lines 4 and 5 according to the switching information (SW), and the current switching connection state. Is transmitted to the control unit 3, and further alarm information (AL) generated in the switching unit 2 is transmitted to the control unit 3.

In the control unit 3, the alarm information (AL) transmitted from the switching unit 2 is transmitted to the switching control circuit 31 via the corresponding gate circuit 33 (conductive state), but transmitted from the switching unit 2. The transmitted current configuration information (SS) is blocked from being transmitted to the current configuration storage unit 32 by the setting circuit 34 (transmission prohibited state).

When maintaining the switching unit 2 in such a state,
When the setting is changed from the cutoff state to the conductive state by manually operating the maintenance switch 26 corresponding to the switching unit 2 to be maintained, the gate circuit 33 in the control unit 3 corresponding to the maintenance target switching unit 2 is set to the cutoff state. The alarm information (AL) set and transmitted from the maintenance target switching unit 2 is the switching control circuit 31.
The abnormal alarm information (AL) is not likely to be transmitted even if the package of the maintenance target switching unit 2 is attached or detached, and the switching control circuit 31 makes an incorrect switching due to the abnormal alarm information (AL). There is no fear of generating information (SW).

Since the setting circuit 34 in the control unit 3 is set to the transmission prohibited state, even if abnormal current configuration information (SS) is transmitted from the maintenance target switching unit 2, the current configuration storage unit 32 is used.
There is no fear of adversely affecting.

After the maintenance of the target switching unit 2 is completed, when the corresponding maintenance switch 26 is manually operated to change the setting from the conductive state to the cutoff state, the recovery circuit in the switching unit 2 targeted for maintenance is changed. 25 is a maintenance switch 26
Detects a change from a conductive state to a cutoff state, generates a reset signal (RS), and transmits the reset signal (RS) to the forced switching circuit 22.

As a result, even if the forced switching circuit 22 forcibly switches and connects the communication lines 4 and 5 to a certain state, the reset signal (RS) is received to cancel the forced switching connection state. After that, the switching circuit 21 switches and connects the communication lines 4 and 5 based on the switching information (SW) transmitted from the control unit 3 via the gate circuit 24 (conductive state).

The gate circuit 33 in the control unit 3 corresponding to the switching unit 2 to be maintained is again set to the conductive state, and the alarm information (AL) transmitted from the switching unit 2 to be maintained thereafter is It is transmitted to the switching control circuit 31.

Next, when maintaining the control unit 3, the control unit 3
When the setting is changed from the cutoff state to the conduction state by manually operating the maintenance switch 35 corresponding to
The gate circuit 24 is set to the cutoff state, and the switching information (SW) transmitted from the control unit 3 is not transmitted to the switching circuit 21. For example, even if the control unit 3 is set to various operating states on a trial basis, Abnormal switching information (SW) is displayed in each switching circuit 21.
Therefore, there is no possibility that each switching unit 2 is erroneously operated.

While the control unit 3 is under maintenance and the corresponding maintenance switch 35 is set to the conductive state, the switching unit 2 connects the communication lines 4 and 5 by manually operating the forced changeover switch 23, for example. For example, by forcibly maintaining the switching connection state as it is, the communication via the communication lines 4 and 5 continues without interruption unless a new switching connection is requested.

After the maintenance of the control unit 3 is finished, the setting switch from the conductive state to the cutoff state is changed by manually operating the corresponding maintenance switch 35. After detecting the change from the conductive state to the cutoff state and transmitting the current configuration information (SS) transmitted from the corresponding switching unit 2 to the switching control circuit 31, thereafter, the transmission of the current configuration information (SS) is prohibited. .

As a result, the switching control circuit 31 includes the switching unit 2
The current switching connection status between the communication lines 4 and 5 is notified, and the switching control circuit 31 sets the current configuration information (SS) in the current configuration storage unit 32 at the same time as generating the switching information (SW).

The recovery circuit 25 in the switching unit 2 detects that the maintenance switch 35 has changed from the conductive state to the cutoff state, generates a reset signal (RS), and outputs the forced switching circuit 22.
Communicate to.

As a result, even if the forced switching circuit 22 forcibly switches and connects the communication lines 4 and 5 to a certain state, the reset signal (RS) is received to cancel the forced switching connection state. After that, the switching circuit 21 determines the communication line 4 and the communication line 5 based on the switching information (SW) transmitted from the control unit 3 via the gate circuit 24 (conductive state).
Switch and connect.

Further, the gate circuit 24 in the switching unit 2 is set to the cutoff state, and the switching information (S) generated and transmitted by the control unit 3 based on the current configuration information (SS) from the switching unit 2 is transmitted.
W) is transmitted to the switching circuit 21, and the switching circuit 21 switches and connects the communication lines 4 and 5 based on the switching information (SW).

As is clear from the above description, according to the present embodiment, when the switching section 2 or the control section 3 is maintained, the corresponding maintenance switch 26 or 35 is set to the conductive state, so that Even if abnormal alarm information (AL) is generated from the switching unit 2 to be maintained, it is not transmitted to the control unit 3, and even if abnormal switching information (SW) is generated from the control unit 3, each switching unit 2 Will not be transmitted to each other, and there is no fear of adverse effects.

It is to be noted that FIG. 2 is merely an embodiment of the present invention, and for example, the configurations of the switching unit 2 and the control unit 3 are not limited to those shown in the drawings, and many other modifications are considered. However, the effect of the present invention does not change in any case.

[0044]

As described above, according to the present invention, in the line switching device, there is no fear that an abnormal switching state is notified to the control unit when the function of the switching unit is stopped, and the function of the control unit is stopped. There is no fear that an abnormal switching instruction will be transmitted to the switching unit when doing so, and even if the function of each unit is stopped without stopping the function of the line switching device, there is no risk of adversely affecting the entire line switching device. , The reliability and maintainability of the line switching device are significantly improved.

[Brief description of drawings]

FIG. 1 is a diagram showing the principle of the present invention.

FIG. 2 is a diagram showing a line switching control system according to an embodiment of the present invention.

FIG. 3 is a diagram showing an example of a line switching device to which the present invention is applied.

FIG. 4 is a diagram showing an example of a conventional line switching control system.

[Explanation of symbols]

 1 Upper device 2 Switching unit 3 Control unit 4, 5 Communication line 6, 7, 81, 82 Signal line 10 Line switching device 21 Switching circuit 22 Forced switching circuit 23 Forced switching switch 24, 33 Gate circuit 25 Recovery circuit 26, 35 Maintenance Switch 31 Switching control circuit 32 Current configuration storage unit 34 Setting circuit 100 First invalidating unit 200 Second invalidating unit 300 Storage unit

Claims (1)

[Claims] 1. One or a plurality of switching units (2) for switching a communication line according to an instruction from the control unit (3) and notifying the switching state to the control unit (3), and a notification from the switching unit (2). A line switching device comprising a control unit (3) for collecting the switching state of the communication line and transmitting a communication line switching instruction to the switching unit (2). A first invalidating unit (100) for prohibiting notification of the switching state to the control unit (3) is provided by a manual operation when the switching unit (2) stops functioning. A second invalidating unit (200) for prohibiting transmission of the switching instruction to the control unit (3) and a notification from the switching unit (2) by a manual operation when the control unit (3) stops functioning. A storage means (300) for holding the latest switching state is provided. A line switching control method that is characterized by turning off.