JP3059002B2 - Route 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 route switching device which is applied to, for example, a data communication system and performs selective switching of a duplicated transmission line.

[0002]

2. Description of the Related Art In a data communication system, a transmission line connecting data transmission devices is duplicated, and when an abnormality occurs in one transmission line, the other transmission line is selectively used to cause a line disconnection. The minimization period is minimized to improve reliability. When the transmission path is duplicated in this way, the transmission path connected to the data transmission apparatus must be switched, and a route switching apparatus is provided.

A route switching device switches a transmission line connected to a data transmission device using a high-frequency relay. The high-frequency relay uses a latching type because the power consumption becomes extremely large when the power is constantly supplied. In the latching type, when a set pulse and a reset pulse are given, a contact switches to a contact side corresponding to each of the set pulse and the reset pulse. The connection is mechanically maintained until the pulse is given, and continues to select the same side.

[0004] However, in the case of a latching type relay, the contact between the contact and the contact may be disconnected due to shock or vibration. When the contact between the contact and the contact is disconnected in this way, the route selection becomes abnormal and the line is disconnected.

[0005]

As described above, in the conventional route switching device, the same transmission path is continuously selected by mechanical connection by switching means such as a latching type relay. When a shock, vibration, or the like is applied, the connection between the contact and the contact is disconnected, and there is a problem that a line disconnection occurs.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method in which a contact between a contact of a switching means and a contact is disconnected due to shock or vibration. It is an object of the present invention to provide a highly reliable route switching device that can automatically restore a switching unit to a normal state and can prevent a malfunction such as a line disconnection.

[0007]

In order to achieve the above object, the present invention provides, for example, a first transmission line such as a connection line to a data transmission device, a second transmission line such as a 0-system data transmission line, and a second transmission line such as a 0-system data transmission line. It is alternatively connected to any one of the third transmission lines such as the 1-system data transmission line. For example, in response to a given first signal such as a set pulse, the second transmission line is Further, in response to a given second signal such as a reset pulse, switching is performed to select each of the third transmission paths, and after one of the first signal or the second signal is given, Switching means such as a high-frequency relay, which continues to select the same transmission path until the other signal is supplied, and setting to which of the second transmission path and the third transmission path the first transmission path is connected Examples for doing And setting means such as a place setting switch,
When the setting of the transmission path connected to the first transmission path is changed by the setting means, a signal corresponding to the changed transmission path of the first signal and the second signal is given to the switching means. A switching control unit such as a switching pulse generating circuit, and a first signal and a second signal in accordance with the setting by the setting unit.
And a malfunction prevention control means such as a malfunction protection pulse generation circuit for periodically providing a signal corresponding to a set transmission line among the signals to the switching control means.

[0008]

According to the present invention, when the setting of the first transmission path to be connected to the second transmission path or the third transmission path, which is set in the setting means, is changed, A signal corresponding to the changed transmission line among the first signal and the second signal is given to the switching unit from the switching control unit,
The switching means connects a transmission path corresponding to a given signal among the second transmission path and the third transmission path to the first transmission path. On the other hand, when there is no change in the setting of the setting means, a signal corresponding to the set transmission line among the first signal and the second signal is periodically supplied from the malfunction prevention control means to the switching control means. The connection operation between the set transmission path and the first transmission path is periodically performed.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration of a data communication system to which the route switching device according to the present embodiment is applied. In the figure, reference numerals 1 and 2 denote data transmission devices, a data transmission device 1 is a transmission side, and a data transmission device 2 is a reception side. The data transmission devices 1 and 2 are route switching devices 3
4 and a data transmission path 5.

The data transmission line 5 includes a 0-system data transmission line 5a.
And the 1-system data transmission line 5b are provided in parallel,
Make a redundant configuration. The 0-system data transmission paths 5a and 1
The system data transmission line 5b is alternatively selected and used by the route switching devices 3 and 4.

The route switching device 3 includes a high frequency relay 31,
It comprises a setting switch 32, a switching pulse generating circuit 33, a malfunction protection pulse generating circuit 34, and OR gates 35 and 36.

The high-frequency relay 31 is of a latching type. In response to a pulse externally supplied to the set terminal S and the reset terminal R, the high-frequency relay 31 is connected to the contacts CS and CR corresponding to the terminal to which the pulse is supplied. Although the connection of the contact is switched, after one pulse is given, the connection is mechanically maintained until the other pulse is given, and the same side is continuously selected. The data transmission device 1 is connected to a common terminal of the high-frequency relay 31. The 0-system data transmission path 5a and the 1-system data transmission path 5b are connected to the contacts CS and CR of the high-frequency relay 31, respectively.

The setting switch 32 is connected to the 0-system data transmission path 5.
This is a switch for setting which of a and the 1-system data transmission line 5b is used. This setting switch 3
2 provides setting information to the switching pulse generation circuit 33 and the malfunction prevention pulse generation circuit 34.

When the setting of the transmission line to be used is changed based on the setting information given from the setting switch 32, the switching pulse generating circuit 33 outputs two output terminals O1 and O2.
A switching pulse is output from any of the above. The switching pulse output from the output terminal O1 is input to one input terminal of the OR gate 35. The switching pulse output from the output terminal O2 is input to one input terminal of the OR gate 36.

The malfunction preventing pulse generating circuit 34 includes a pulse oscillator 34a and a selector 34b. The pulse oscillator 34a oscillates a pulse at a predetermined cycle. The selector 34b outputs the pulse oscillated by the pulse oscillator 34a to one of the OR gates 35 and 36 as a malfunction prevention pulse based on the setting information given from the setting switch 32. The malfunction prevention pulse output from the selector 34b is input to the other input terminals of the OR gates 35 and 36.

The OR gate 35 is connected to the switching pulse generation circuit 3
The switching pulse output from 3 and the malfunction prevention pulse output from the malfunction prevention pulse generation circuit 34 are applied to the set terminal S of the high frequency relay 31. The OR gate 36
The switching pulse output from the switching pulse generation circuit 33 and the malfunction prevention pulse output from the malfunction prevention pulse generation circuit 34 are applied to the reset terminal R of the high-frequency relay 31. Although not shown, the route switching device 4 has the same configuration as the route switching device 3.

Next, the operation of the data communication system configured as described above will be described. First, set the setting switch 32 to 0
When the use of the system data transmission line 5a is set, the high-frequency relay 31 is connected to the contact CS side. Therefore, the data transmission apparatus 1 and the data transmission apparatus 2 are connected to each other via the 0-system data transmission path 5a, and the data output from the data transmission apparatus 1 is transmitted via the 0-system data transmission path 5a. It is transmitted to the device 2.

In this state, when the setting of the setting switch 32 is changed in order to switch the transmission path to be used to the first system data transmission path 5b, the switching pulse generating circuit 33 changes the setting information output from the setting switch 32. Recognizes the switching to the first-system data transmission line 5b, and outputs a switching pulse from the output terminal O2. This switching pulse is supplied to the OR gate 36.
Through the reset terminal R of the high-frequency relay 36 as a reset pulse. When a reset pulse is applied to the reset terminal R of the high-frequency relay 31, a contact is connected to a contact CR corresponding to the reset terminal R. Thus, the data transmission apparatus 1 and the data transmission apparatus 2 are connected via the 1-system data transmission path 5b, and thereafter, the data output from the data transmission apparatus 1 is transmitted via the 0-system data transmission path 5a. And transmitted to the data transmission device 2.

Conversely, when the setting of the setting switch 32 is changed in order to switch the transmission line to be used from the state in which the 1-system data transmission line 5b is used to the 0-system data transmission line 5a, the switching pulse generation circuit 33 Recognizes switching to the 0-system data transmission line 5a from a change in the setting information output from the setting switch 32, and outputs a switching pulse from the output terminal O1. This switching pulse is applied as a set pulse to the set terminal S of the high-frequency relay 36 via the OR gate 35. In the high-frequency relay 31, when a set pulse is given to the set terminal S, a contact is connected to a contact CS corresponding to the set terminal S. Thus, the data transmission device 1
And the data transmission apparatus 2 are connected via the 0-system data transmission path 5A.

When the transmission path is not changed as described above, no switching pulse is output from the switching pulse generating circuit 33. At this time, the malfunction prevention pulse is oscillated at a predetermined cycle in the pulse oscillator 24a, and is input to the OR gate 35 or the OR gate 36 via the selector 34b. When the 0-system data transmission line 5a is set as the transmission line to be used, the selector 34b sends the malfunction prevention pulse oscillated by the pulse oscillator 24a to the OR gate 35 and the 1-system data transmission line as the transmission line to be used. When the transmission path 5b is set,
The malfunction prevention pulse oscillated by the pulse oscillator 24a is output to the OR gate 36.

Therefore, when the 0-system data transmission line 5a is set as the transmission line to be used, a malfunction prevention pulse is supplied to the set terminal S of the high-frequency relay 31 via the OR gate 35. Thereby, the high frequency relay 31
Is repeatedly set at a predetermined cycle. When the first-system data transmission line 5 b is set as the transmission line to be used, the malfunction prevention pulse is supplied to the reset terminal R of the high-frequency relay 31 via the OR gate 36.
Thereby, the reset operation of the high-frequency relay 31 is repeatedly performed at a predetermined cycle.

Thus, if the high frequency relay 31 receives a shock or vibration and the contact is disengaged from the proper contact, the set operation is performed when the proper contact is the contact CS, and the setting operation is performed when the proper contact is the contact CR. Since the reset operation is repeatedly performed, the contact is automatically connected to the proper contact, thereby automatically returning to the normal state.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the route switching device according to the present invention is applied to a data communication system, but any system other than the data communication system may be used as long as the system transmits some signal using a duplicated transmission line. The application of the present invention is possible. In addition, various modifications can be made without departing from the spirit of the present invention.

[0024]

According to the present invention, for example, a first transmission line such as a connection line to a data transmission device is replaced with a second transmission line such as a 0-system data transmission line and a third transmission line such as a 1-system data transmission line. The second transmission path is selectively connected to any one of the transmission paths, for example, in response to a given first signal such as a set pulse, and the predetermined second signal such as a reset pulse. Switching is performed so as to select the third transmission path in response to the application of the two signals, and after one of the first signal or the second signal is applied, the same until the other signal is applied. Switching means such as a high-frequency relay for continuously selecting the transmission path, and setting such as a setting switch for setting to which of the second transmission path and the third transmission path the first transmission path is connected. Means When the setting of the transmission path connected to the first transmission path is changed by the setting means, a signal corresponding to the changed transmission path of the first signal and the second signal is given to the switching means. A switching control unit such as a switching pulse generating circuit, and a signal corresponding to the set transmission line among the first signal and the second signal is periodically supplied to the switching control unit in accordance with the setting by the setting unit. For example, a malfunction prevention control means such as a malfunction protection pulse generation circuit is provided, so that when the connection between the contact and the contact of the switching means is disconnected due to shock or vibration, the switching means is automatically set to a normal state. And a highly reliable route switching device capable of preventing occurrence of malfunction such as line disconnection.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a data communication system to which a route switching device according to one embodiment of the present invention is applied.

[Explanation of symbols]

1, 2, ... data transmission device 3, 4, ... route switching device, 5 ... data transmission line, 5a
... 0 system data transmission line, 5b ... 1 system data transmission line,
31: High frequency relay, 32: Setting switch,
33: switching pulse generation circuit, 34: malfunction protection pulse generation circuit, 34a: pulse oscillator, 34
b ... selector, 35, 36 ... OR gate.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04L 1/22 H04L 29/14

Claims (1)

(57) [Claims] A first transmission path connected to one of a second transmission path and a third transmission path, wherein the second transmission path is connected to a second transmission path in response to a predetermined first signal; The transmission path
Switching is performed to select the third transmission path in response to the given second signal, and after one of the first signal or the second signal is given, the other signal is given. Switching means for continuously selecting the same transmission path until the setting is made; setting means for setting which of the second transmission path and the third transmission path the first transmission path is to be connected to; Switching control means for providing, to the switching means, a signal corresponding to the changed transmission path of the first signal and the second signal in response to the change of the setting of the transmission path connected to the first transmission path. A malfunction prevention control means for periodically giving a signal corresponding to the set transmission line of the first signal and the second signal to the switching control means in accordance with the setting by the setting means. Featured routes Changing apparatus.