JP2793476B2 - Communication network line rescue 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 communication network circuit rescue apparatus, and more particularly to a communication network circuit rescue apparatus in which inter-station communication becomes impossible due to a failure of a small station in an optical fiber cut-off state between large stations of an optical fiber network. It relates to a line rescue method.

[0002]

2. Description of the Related Art As a conventional line rescue system, there is a system called a line protection system. In this method, at least one backup line is prepared for a plurality of current lines, and in the case of a failure, the failed line is switched to the backup line to remedy the failure.

Further, when a fault occurs in a plurality of lines, another route is previously secured from the fault location, and the fault is remedied using the detour route.

In a small station where another route is not secured,
Another route is manually rearranged by rearranging patch cords on the patch panel, etc., to remedy the problem.

[0005]

In the line protection system which is a conventional line rescue system, only about one spare line is provided, and it is difficult to remedy faults of a plurality of lines.

In the alternative route method in which another route is secured, it is a prerequisite that an alternative route exists, and failure cannot be remedied without an alternative route.

[0007] When another route is not easily present, the patch cord is rearranged, and when another route is manually established to remedy the failure, a considerable amount of time and labor for executing the rearrangement are required. Is required.

It is an object of the present invention to provide a communication network line rescue apparatus which can rescue a line in a small station in which another route is not secured without changing a patch code.

[0009]

SUMMARY OF THE INVENTION A communication network circuit rescue apparatus according to the present invention has a small station connected between a first and a second large station by a single route line with the large station. A line rescue device in a communication network, wherein the single route line includes a direct line between the first large-scale station and the small station, and a direct line between the first and second large-scale stations. And having a second single route line connecting said first and second large-scale stations via a third large-scale station, wherein said second single-route line is provided between said first large-scale station and said small-scale station. When the single route line is disconnected, the small station transfers data to a direct line between the first and second large stations according to an operator's command, and further transfers the data to the second line. From a large station to the first large station via the second single route Characterized in that it comprises a means for signal.

[0010]

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

FIG. 1 is a configuration diagram of a communication network to which an embodiment of the present invention is applied. 1, 2, 3, 4, and 5 are relatively large-scale stations, and 10, 11, and 12 are small-scale stations. The stations are shown and are connected between the large stations 1 and 2 by a single route line. The data of the subscriber system at this small station is once sent to a nearby large station and then transmitted to the destination.

For example, when the subscriber system data of the small station 10 is to be sent to the large station 3, the data is once sent from the large station 4 to the large station 5 via the large station 1.

FIG. 2 is a detailed view of the state of the communication network line. The small stations 10, 1 existing between the large stations 1, 2 are shown in FIG.
1, a line 20 between the large station 1 and the small station 10, a line 21 between the large station 1 and the small station 12, and a line 22 between the large station 1 and the large station 2 are shown.

The line 20 is connected to the subscriber system from the large-scale station 1 to the small station 10, the line 21 is connected to the subscriber system at the small station 12, and the line 22 is connected to the large-scale station 1 and the large-scale station 2. The present invention requires a network configuration in which there is a direct line between such large-scale stations.

FIG. 3 is a diagram showing a line switching state in the case where a failure 100 due to complete disconnection of an optical fiber has occurred between the large-scale station 1 and the small-scale station 10.

When the fault 100 is detected in the small station 10, the line 20 and the line 21 are connected to the direct line 22 between the large stations in order to rescue the line between the small station 10 and the large station 1.
To transmit the data to the large-scale station 2 once.

The large-scale station 2 is a device equivalent to a cross-connect, for example, via the large-scale station 4 shown in FIG.
Enable communication with

FIG. 4 is a detailed diagram showing an execution state of line transfer in the embodiment of the present invention. Assuming a small station 10 in the event of a failure 100, data is transferred to a direct line 22 and a line 20 is transferred. To rescue.

The control section 31 controls the execution sections 32a and 32b in response to an instruction from the operator 30. Execution unit 32
a and 32b are selectors 33a and 33b for passing line data through the direct line 37 under the control of the control unit 31.
Control. The communication units 34a and 34b indicate communication units that actually perform optical communication, and the cable 35 is the execution units 32a and 32b.
Are connected.

The operation will be described below. Now, obstacle 100
(Optical cable disconnection) occurs, the small station 10,1
Communication between the large-scale stations 1 and 2 including the stations 1 and 12 cannot be performed. In such a case, the data 36 from the subscriber system in the small station 10 must be transmitted to the large station 1 by any method to secure communication.

The direct line 22 includes the large-scale station 1 and the large-scale station 2
Are connected directly to each other. Even if a failure 100 occurs, the line on the right side (see FIG. 3) can be communicated from the small station 10 and the communication between the small station 10 and the large station 1 is disconnected. If done, this line becomes an empty line.

Therefore, the operator 30 of the small station 10
In order to rescue the line 20 (see FIG. 3), the operator 30 issues a command to the control unit 31, and the control unit 31 sends the selectors 33a, 33b existing in the execution units to the execution units 32a, 32b. To control the data 3 from the subscriber.
6 is controlled to pass through the direct line 22.

The direct line 22 is always connected to the selector 33b of the execution unit 32b of FIG. Similarly, the subscriber data 36 is always connected to the selector 33a of the execution unit 32a.

The flow of data when the failure 100 occurs is represented by bold lines A and B. The bold line A is a flow for transferring the subscriber data 36 to the direct line 22. The execution unit 32a operates the selector 33a to transfer the subscriber data to the direct line 22 in response to a command from the control unit 31.

Conversely, as indicated by the thick line B, the data from the direct line 22 controls the execution unit 32b in accordance with a command from the control unit 31, and the execution unit 32b operates the selector 33b to be transmitted as subscriber data 36.

Of course, when the failure 100 has not occurred (during normal communication), the selector 33a does not select the subscriber data 36, and similarly, the selector 33b does not select the data of the direct line 22.

The data transferred to the direct line 22 in this way is transmitted to the large-scale station 2 (see FIG. 3), and is transmitted via the large-scale station 4 (see FIG. 1), which is a device equivalent to a cross-connect. Reaching the large station 1, communication between the large station 1 and the small station 10 is secured.

For this reason, communication is normally performed between the large-scale stations 1 and 2. However, in a network configuration in which a communication line 37 that can be used only when a failure occurs can be secured, the transmission apparatus shown in FIG. Relief of the line.

[0029]

According to the present invention, when a line disconnection occurs in a small station where another route is not secured, the line is switched using the network configuration in which a vacant line is created without creating another route. Thus, there is an effect that a line failure can be remedied.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a communication network to which an embodiment of the present invention is applied.

FIG. 2 is a detailed diagram of a communication network line state according to the embodiment of the present invention.

FIG. 3 is a diagram for switching lines when the line is completely disconnected in the embodiment of the present invention.

FIG. 4 is a detailed diagram showing an execution state of line transfer according to the embodiment of the present invention.

[Explanation of symbols]

 1, 2, 3, 4, 5 Large station 10, 11, 12 Small station 20 Line 20 (between large station 1 and small station 10) 21 Line 21 (of large station 1 and small station 12) 22) Line 22 (between large-scale station 1 and large-scale station 2) 30 Operator 31 Control unit 32a, 32b Execution unit 33a, 33b Selector 34a, 34b Communication unit 35 Cable 36 Subscriber data 100 Failure (fully disconnected state) )

Claims (2)

(57) [Claims] Claims 1. A small station connected between a first and a second large station by a single route line with the large station,
The single route line is a line rescue device in a communication network composed of a direct line between the first large-scale station and the small station and a direct line between the first and second large-scale stations. And having a second single route line connecting said first and second large-scale stations via a third large-scale station, wherein said second single-route line is provided between said first large-scale station and said small-scale station . When a single route line is disconnected, the small station transfers data to a direct line between the first and second large stations according to an operator's command, and further transfers the data to the second large station. A communication network circuit rescue apparatus, comprising means for transmitting from a large-scale station to the first large-scale station via the second single route. 2. The small-sized station is provided in plurality between the first and second large-scale stations, and each of these small-sized stations has the means. The communication network line rescue device according to the above.