JPH08204616A - Transmission line changeover device and method thereof - Google Patents

Abstract

PURPOSE: To simplify the selection and changeover of a desired transmission line and to surely select a transmission line. CONSTITUTION: The changeover device is provided with a changeover circuit 2 selecting either of two transmission paths X0, X1 or over interconnected between a transmission station N1 and a reception station N2, a storage circuit 3 storing connection information of the transmission station N1 and the reception station N2 interconnected with each other through the transmission paths X0, X1, a storage circuit 4 storing containing information of a transmission line containing the transmission paths X0, X1 and a control means 8 with the function of a 1st path extract means 5 extracting all transmission paths interconnecting the specific transmission station N1 and reception station N2 based on the connection information stored in the storage circuit 3, the function of a 2nd path extract means 6 extracting a transmission path not contained in a specific transmission line based on the connection information stored in the storage circuit 4, and the function of a control signal output means 7 outputting a control signal to the changeover circuit 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission line switching technique for selectively switching a desired transmission line.

[0002]

2. Description of the Related Art In the operation of a network for connecting a plurality of transmitting stations and receiving stations by a transmission path, for example,
When a specific transmission path becomes unavailable, such as when multiple transmission paths accommodated in the transmission path become unavailable due to construction of the transmission path section, network operation failure is somehow remedied. There is a need to. Therefore, conventionally, work has been performed in which a transmission path is duplicated in advance and the operation path is switched from the transmission path accommodated in the transmission path to another duplicated transmission path.

FIG. 4 is a network configuration diagram for explaining a conventional transmission line switching method of this type. In FIG. 4, the nodes A, B, and C have the functions of a transmitting station and a receiving station, and the transmission paths a, b, and c are two transmission paths X and X, respectively.
It is a bidirectional communication path that accommodates Y. Further, each of the transmission paths X and Y has two routes, that is, a 0-system and a 1-system, and thereby a duplicated transmission path is formed in the network. Specifically, in the transmission path X, the 0 system communicates with the route of the node A to the transmission line a to the node C, while the 1 system communicates with the node A to the transmission line b to the node B to the transmission line c to the node. Communication is performed through the route of C. Then, in the transmission path Y, communication is performed by the 0 system through the route of the node B-transmission line b-node A-transmission line a-node C, while the 1-system is performed by the route of node B-transmission line c-node C. Communication is performed.

Here, for example, when a failure occurs in the transmission path b, the node A and the node C, which are the end nodes of the transmission path X, detect the failure in the 1-system and switch the transmission path X to the 0-system. Furthermore, the node B and the node C, which are the end nodes of the transmission path Y, detect the 0-system failure and set the transmission path Y to 1
Switch to the system. This ensures communication within the network.

Further, for example, when it is known in advance that the transmission path b will be disconnected due to the construction of the transmission path b, the operator has the transmission path b with the 1 system of the transmission path X and the 0 system of the transmission path Y. After recognizing that it is accommodated, the operation system outputs a control command for switching the transmission path X to the 0-system side to the nodes A and C, and also transmits the transmission path Y to the nodes B and C. Communication within the network was secured by outputting a control command to switch to the 1-system side. The above operation has been switched individually by the operator by grasping the transmission path passing through the unavailable transmission path.

[0006]

However, such a conventional transmission line switching method has the following problems because the transmission path is switched based on the operator's judgment. That is, 0 in the transmission paths X and Y
When switching the system or the 1 system, the operator needs to confirm the transmission path passing through the transmission paths a, b, and c and the system of the path. In addition, since a plurality of transmission paths are individually designated and switched, it takes a long time to perform the switching operation, and there is a risk that the switching system may be mistaken for human judgment.

An object of the present invention is to solve the above problems, to simplify the transmission line switching operation, and to provide a technique for reliably switching the transmission lines.

[0008]

As shown in FIG. 1, for example, an apparatus configuration of the present invention for solving the above-mentioned problems is a transmitting station N1 which transmits a predetermined information signal and an information signal transmitted from the transmitting station N1. A switching circuit (transmission path switching means) for selectively switching any one of the transmission paths X0 and X1 of at least two routes connected between the receiving stations N2 for receiving the call based on a control signal from the outside. 2, a storage circuit (connection information storage means) 3 for storing connection information of the source station N1 and the destination station N2 connected by the transmission paths X0, X1, and accommodation information of a transmission path in which the transmission paths X0, X1 are accommodated. A storage circuit (accommodation information storage means) 4 for storing
A function as a first path extracting means 5 for extracting all transmission paths connecting between a specific transmitting station N1 and a specific receiving station N2 based on the connection information stored in the storage circuit (connection information storing means) 3; A function as the second path extracting means 6 for extracting a transmission path other than the transmission path accommodated in the specific transmission path based on the accommodation information stored in the storage circuit (accommodation information storage means) 4, and a switching circuit ( Control means 8 having a function as a control signal output means 7 for outputting a control signal to the transmission path switching means 2).

[0009]

[Operation] Based on a plurality of transmission paths connected between the originating station and the terminating station, based on the connection information of the originating station and the terminating station connected by each transmission path, all the connections between the particular originating station and the terminating station are made. Of the transmission paths other than the transmission path accommodated in the specific transmission path is extracted from the accommodation information of the transmission path in which the transmission path is accommodated, and the common transmission path extracted together with these is extracted. , The transmission path connecting the source station and the destination station can be selectively switched as the operation path.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing a schematic configuration of a transmission line switching device 1 according to an embodiment of the present invention, and the same elements as those of FIG. 1 which is the principle diagram of the present invention are denoted by the same reference numerals. In FIG. 2, the transmission path switching device 1 includes a switching circuit 2 that is a transmission path switching unit, a storage circuit 3 that is a connection information storage unit, and a storage circuit 4 that is an accommodation information storage unit.
First path extracting means 5, second path extracting means 6, and
It is composed of a control circuit 8 having each function of the control signal output means 7.

The switching circuit 2 includes a transmitting station N1 and a receiving station N2.
Are provided in the nodes A, B, and C, and in the transmission paths X and Y based on a control signal from the control circuit 8 described later, the transmission paths X and Y of either the 0-system or the 1-system.
Is selectively switched. The memory circuit 2 and the memory circuit 3 are configured by, for example, a fixed magnetic memory device or the like, and the memory circuit 2 stores connection information of each node A, B, C connected by each transmission path X, Y, The storage circuit 3 includes a transmission path a, in which the transmission paths X and Y are accommodated,
The accommodation information of b and c is stored. The control circuit 8 extracts all the transmission paths X and Y that connect the specific nodes based on the connection information in the storage circuit 2, and the specific transmission path a (based on the accommodation information in the storage circuit 3). b, c)
To extract the transmission paths X and Y other than those accommodated in the above, and use the extracted common transmission paths X and Y as the operation paths when a specific transmission path a (b, c) becomes unavailable. Is output to the switching circuit 2.

Next, the operation of the transmission path switching device 1 having the above configuration will be described. FIG. 3 is a flowchart for explaining an operation example according to this embodiment, and S represents a processing step. Referring to FIG. 3, first, the transmission path b is set by the operator.
When the control circuit 8 is instructed to collectively switch the transmission paths in the transmission path b, the control circuit 8 causes the transmission path b
The transmission path accommodated therein is searched based on the accommodation information in the storage circuit 3 (S1). As a result, the transmission line b
It is determined that the 1-system of the transmission path X and the 0-system of the transmission path Y in the above are unusable, and the usable transmission path is the transmission path X.
Other than the 1-system and the 0-system of the transmission path Y, that is, the transmission path X
0 system and the 1 system of the transmission path Y, and the determination result is held in the control circuit 8 (S2).

Next, the control circuit 8 causes each transmission path X,
The node to which Y is connected is searched based on the connection information in the memory circuit 2 (S3). As a result, the transmission path X
Is recognized by the control circuit 8 that the node A and the node C are connected and the transmission path Y is connected between the node B and the node C, and the recognition result is held in the control circuit 8 (S
4). Then, in the control circuit 8, based on the results obtained in the processing of S2 and the processing of S4, the control circuit 8 controls the switching circuit 2 in the node B to switch the transmission path Y to the 1-system side. And a control signal for switching the transmission path X to the 0-system side and a control signal for switching the transmission path Y to the 1-system side are output to the node C (S5). As a result of the above, communication in the network is ensured while all the transmission paths accommodated in the transmission path b are in the non-operational state.

In the above embodiment, the transmission path X and the transmission path Y are switched at the same time. However, when the nodes to be used are specified, only the transmission path between the nodes is switched as the working path. You may do it.

As described above, in this embodiment, based on the plurality of transmission paths connected between the respective nodes, all the transmissions connected between the specific nodes based on the connection information of the nodes connected by the respective transmission paths. Operation to extract the paths, extract the transmission paths other than the transmission paths accommodated in a specific transmission path from the accommodation information of the transmission path in which the transmission paths are accommodated, and connect the transmission paths common to these to the relevant nodes. Switching is performed as a pass. Therefore, unlike the conventional case, it is not necessary for the operator to confirm the transmission path and the path system at the time of switching, and since the plurality of transmission paths are not individually specified and switched, the switching operation time can be shortened, Furthermore, it is possible to suppress the occurrence of mistakes that are likely to occur in human judgment processing.

[0016]

As is apparent from the above description, according to the present invention, when a predetermined transmission line is in a non-operational state, it is possible to secure a communication route by using another transmission line. The switching operation can be simplified and the transmission path can be reliably switched.

[Brief description of drawings]

FIG. 1 is a principle diagram of a transmission path switching device of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a transmission line switching device according to the present embodiment.

FIG. 3 is a flowchart for explaining an operation example of the present embodiment.

FIG. 4 is an explanatory diagram showing an example of a network for explaining a conventional transmission line switching method.

[Explanation of symbols]

 1 transmission path switching device 2 switching circuit (transmission path switching means) 3 storage circuit (connection information storage means) 4 storage circuit (accommodation information storage means) 5 first path extraction means 6 second path extraction means 7 control signal output Means 8 control circuit

Claims (3)

[Claims] 1. At least one transmission path of at least two or more routes connected from the outside between a transmitting station transmitting a predetermined information signal and a receiving station receiving the information signal transmitted from the transmitting station. Transmission path switching means for selectively switching based on the control signal, connection information storage means for storing connection information of a transmitting station and a receiving station connected by the transmission path, and a transmission path for accommodating the transmission path. Accommodation information storage means for storing accommodation information, and first path extraction means for extracting all transmission paths connecting between a specific originating station and a destination station based on the connection information stored in the connection information storage means A second path extracting means for extracting a transmission path other than a transmission path accommodated in a specific transmission path based on the accommodation information stored in the accommodation information storage means, and a specific transmission path in the transmission path. On the contrary, when transmitting and receiving the information signal between a predetermined transmitting station and a receiving station, the common transmission path extracted by the first and second path extracting means is selected by the transmission path switching means. A transmission path switching device comprising: a control signal output unit that outputs a control signal to be a transmission path to the transmission path switching unit. 2. An originating station and an incoming call connected by each transmission path of a plurality of transmission paths connected between an originating station that emits a predetermined information signal and an incoming station that receives the information signal transmitted from the originating station. A step of extracting all transmission paths that connect between a specific calling station and a called station based on the connection information of the stations, and based on the accommodation information of the transmission paths in which the transmission paths are accommodated in the extracted transmission paths. A step of extracting a transmission path other than the transmission path accommodated in a specific transmission path, and selecting the finally extracted transmission path as an operation path from a plurality of transmission paths connecting the source station and the destination station. And a step of dynamically switching. 3. A transmission path accommodating each transmission path of a plurality of transmission paths connected between a transmitting station transmitting a predetermined information signal and a receiving station receiving the information signal transmitted from the transmitting station. Extracting the transmission paths other than the transmission paths accommodated in the specific transmission path based on the information, and based on the connection information of the source station and the destination station connected by each transmission path in the extracted transmission path The step of extracting all the transmission paths that connect between a specific source station and the destination station, and the finally extracted transmission path as the working path from the multiple transmission paths that connect the source station and the destination station. A transmission path switching method comprising: a step of selectively switching.