JPH11331168A - Line switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the redundancy of a switch part without affecting a normally connected port. SOLUTION: This line switching device constitutes an (n+m)×(n+m) matrix switch, by adding (m) (1<=m<=n) sets of auxiliary input ports 3 and auxiliary output ports 4 to an n×n matrix switch having (n) sets of input ports 1 and output ports 2, and returns the auxiliary output ports 4 to the auxiliary input ports 3. When a fault occurs at an intersection P of the n×n matrix switch, the input port 1, where the fault is detected, is connected to the auxiliary output port 4, and the auxiliary input port 3 is connected to the output port 2 where the fault is detected, so that a bypass route can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line switching apparatus for accommodating a plurality of ports and switching data between the ports.

[0002]

2. Description of the Related Art A matrix switch according to the present invention is used in a line switching apparatus which accommodates a plurality of ports and switches data between the ports. Such a line switching device generally has a problem that the switching unit lacks redundancy.

As means for solving this problem, for example, Japanese Unexamined Patent Publication No. Hei 7-264198 describes a matrix switch that realizes an N + 1 redundant configuration using one spare input port and a space switch. FIG. 4 is a block diagram showing an example of a conventional matrix switch redundant system.

A self-routing switch (same as a matrix switch) 11 is one of a plurality of input ports 12.
A book is used as a spare input port 16, the rest is used as a working port 15, and there is a space switch 17 for switching any one of the working ports 15 to a spare port 16.
When a failure occurs at the intersection 13 ′ of the self-routing switch 11, the self-routing switch 11 forms a detour by switching the space switch 17.

[0005]

As described above, FIG.
Is a N + 1 redundant configuration using one spare input port and a space switch. Therefore, this method has a problem that it cannot be remedied when a plurality of failures occur at the intersections of the matrix switches.

In addition, a plurality of matrix switches are prepared,
A configuration for switching to a spare matrix switch is also conceivable, but in this case, there is a problem that a normally connected port must also be switched.

A main object of the present invention is to provide a line switching apparatus which can increase the redundancy of a switch unit without affecting a normally connected port.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a line switching apparatus for accommodating n ports and switching between ports, wherein an n × n matrix switch having n sets of input ports and output ports includes m (1 ≦ 1). m ≦ n) sets of spare input ports and spare output ports are added (n + m) × (n + m)
Configuring a matrix switch, folding back the spare output port to the spare input port, and when a failure occurs at the intersection of the n × n matrix switches, connect the input port that has detected the failure to the spare output port; By connecting the spare input port to an output port that has detected a failure, a bypass route is formed to restore the line.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a basic configuration of a switch section of a line switching device according to the present invention.

In the switch section shown in FIG. 1, when the number of lines is n, the n × n matrix switch having n pairs of input ports 1 and output ports 2 has m (1 ≦ m ≦
(n) A (n + m) × (n + m) matrix switch in which a set of the spare input port 3 and the spare output port 4 is added, and the spare output port 4 is connected to the spare input port 3 by the return path 5 for each port. Has become.

When a failure occurs at the intersection P of the n × n matrix switch, first, the input port 1 where the failure is detected
Is output to the added auxiliary output port 4. The spare output port 4 is turned back to the spare input port 3, and by connecting the spare input port 3 to the output port 2 where the failure is detected, a detour is formed and the line can be restored.

[0013]

Next, an embodiment of the present invention will be described with reference to FIG. FIG. 2 is a block diagram showing one embodiment of the line switching device.

The matrix switch includes a switch control unit 8
Is controlled by The input port 1 has an input port monitoring unit 6, and the output port 2 has an output port monitoring unit 7. These port monitoring units perform data monitoring processing such as counting the number of packets input or output for each port. The input port monitoring unit 6 and the output port monitoring unit 7 output the processing result for each port to the switch control unit 8.
Notify.

The switch control unit 8 controls the matrix switch, and switches between the input port 1 (n port) and the output port 2 (n port). Further, the switch control unit 8 compares the processing results from the input port monitoring unit 6 and the output port monitoring unit 7 for each connected port, and verifies the operation of the matrix switch. When an operation abnormality is detected, the switch control unit 8 sets the standby output port 4
The following control is performed using the spare input port 3 and forming a detour.

The spare output port 4 is connected to the input port 1 where an abnormality is detected under the control of the switch control unit 8. Further, the spare input port 3 is connected to the output port 2 where an abnormality is detected under the control of the switch control unit 8. Since the spare output port 4 is turned back to the spare input port 3 in advance, the ports where the abnormality is detected are connected via the spare port.

Thus, the intersection P of the matrix switch
In the event of a failure, the connection between the ports is restored.

Next, the operation of the embodiment of FIG. 2 will be described.

The switch controller normally controls an n × n matrix switch. After that, in order to confirm that the operation of the switch is normal, the monitoring results from each input port monitoring unit 6 and the corresponding output port monitoring unit 7 are compared for each connected port. The operation of the switch is determined to be normal, and if not, it is determined to be abnormal.

If it is determined that there is an abnormality, the switch control unit 8
Uses a spare port and controls to form a detour. For example, in FIG. 2, input port 1 (I-
i), when a failure occurs at or around the intersection Pij of the output port 2 (Oj), the switch control unit 8 sets the input port 1 (Ii) of the input port monitoring unit 6 and the output port monitoring unit 7 As a result of monitoring between the output ports 2 (O-j), a mismatch is detected.

Next, the switch control unit 8 forms a detour by using an unused spare port. First, the input port 1 (Ii) is output to the spare output port 4 (Ok), and then the spare input port 3 (Ik) is output to the output port 2 (Ok).
(O-j). Spare output port 4 (O-k)
Are connected to the preliminary input port 3 (Ik) in advance, so that the input port 1 (Ii) is connected to the output port 2 (Ik).
(O-j) via a spare port.

Next, another embodiment of the circuit switching device will be described with reference to the drawings. FIG. 3 is a block diagram showing another embodiment of the switch unit of the line switching device.

The basic configuration of the switch unit shown in FIG. 3 is the same as that of the switch unit shown in FIG. 1, but the switch unit shown in FIG. 3 has a spare port turned back between a plurality of matrix switches. In FIG. 3, matrix switch A
Is connected to the spare input port 3 of the matrix switch B, and the spare output port 4 of the matrix switch B is connected to the spare input port 3 of the matrix switch A.
Connected to

In this embodiment, ports can be switched between independent matrix switches. Note that FIG.
In the embodiment shown in FIG. 1, the case where the number of matrix switches is two has been described. However, it is needless to say that the present invention is not limited to the case where the number of matrix switches is two, but includes the case where there are a plurality of matrix switches.

[0025]

As described above, according to the present invention, when a failure occurs at the intersection of the matrix switches, the line can be restored. In the case of a matrix switch having no spare port, a connection between failed ports cannot be made. By preparing a plurality of spare ports, it is possible to remedy even if failures occur simultaneously by the number of spare ports.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a switch unit of a line switching device according to the present invention.

FIG. 2 is a block diagram illustrating a configuration of a switch unit as one embodiment of a line switching device;

FIG. 3 is a block diagram showing another embodiment of the switch unit of the line switching device.

FIG. 4 is a block diagram showing an example of a conventional matrix switch redundant system.

[Explanation of symbols]

 1 input port 2 output port 3 spare input port 4 spare output port 5 return path P intersection

Claims (7)

[Claims] 1. A line switching apparatus for accommodating a plurality of ports and switching between ports, comprising a matrix switch having a plurality of spare input ports and a plurality of spare output ports, wherein the spare output port of the matrix switch is connected to the spare input port. A line switching device characterized by forming a detour route and restoring a line when a failure occurs at an intersection of matrix switches by turning back to a port. 2. A line switching apparatus accommodating n ports and switching between ports, wherein m (1 ≦ m ≦ n) sets of spare inputs are applied to an n × n matrix switch having n sets of input ports and output ports. port,
A spare output port is added to form a (n + m) × (n + m) matrix switch, and the spare output port is turned back to the spare input port. If a failure occurs at the intersection of the n × n matrix switch, a failure occurs. A line switching apparatus, wherein an input port that has detected a failure is connected to the standby output port, and the standby input port is connected to an output port that has detected a failure, thereby forming a detour route and restoring the line. 3. A line switching apparatus for accommodating a plurality of ports and switching between the ports, comprising a plurality of matrix switches each having a plurality of spare input ports and a plurality of spare output ports, wherein the plurality of matrix switches have the spare output. A line switching device, wherein a port is switched between a plurality of matrix switches by turning a port back to the spare input port. 4. A line switching apparatus accommodating a plurality of ports and switching between the ports, comprising: a first matrix switch having a plurality of spare input ports and a plurality of spare output ports; A second matrix switch having a spare output port, wherein a spare output port of the first matrix switch is turned back to a spare input port of the second matrix switch, and a spare output port of the second matrix switch is A line switching device, wherein a port is switched between the first and second matrix switches by turning back to a spare input port of a first matrix switch. 5. A line switching method for switching between a plurality of ports, wherein the spare output port of a matrix switch having a plurality of spare input ports and a plurality of spare output ports is folded back to the spare input port. A line switching method characterized by forming a detour route and restoring a line when a failure occurs at an intersection of switches. 6. A line switching method for switching between n ports, wherein an n × n matrix switch having n sets of input ports and output ports is provided with m (1 ≦ m ≦ n) sets of spare input ports,
A (n + m) .times. (N + m) matrix switch having a spare output port is configured. If a failure occurs at the intersection of the n.times.n matrix switch, an input port that has detected the failure is connected to the spare output port. A line switching method for forming a detour route and restoring a line by returning the standby output port to the standby input port and connecting the standby input port to an output port in which a failure is detected. 7. A line switching method for switching between ports, wherein a plurality of spare input ports are returned to the spare input ports between a plurality of matrix switches having a plurality of spare input ports and a plurality of spare output ports. Switching a port between the matrix switches.