JPS5854699B2 - Spare switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a backup switching device that performs switching between active and backup packet transfer devices and also forms a return circuit.

In a storage/switching device equipped with a packet transfer device, a backup packet transfer device is installed to switch to the backup packet transfer device when a failure occurs or maintenance is performed on the current packet transfer device. For example, the first
The configuration was shown in the figure.

In the figure, 1 is a backup switching device, 2 is a backup packet transfer device, 3-1 to 3-n are active packet transfer devices,
4-1 to 4-n are switch circuits consisting of relays, transistors, etc.; 5 and 6 are +o and +i lines accommodated in the backup packet transfer device 2; 7-1 to 7-n, 81 to 8-
n is the +0°-#-1 line accommodated in the packet transfer devices 3-1 to 3-n, 9-1 to 9-n, 10-1
10n is a transmission path, 20 is a common control device, and 21 and 22 are control lines.

For example, when a failure occurs in the packet transfer device 3-n or during maintenance and inspection, the common control device 20 controls the backup switching device 1 via the control line 22, and the switch circuit 4-n of the backup switching device 1 connects the transmission line 9-. n.

The packet transfer device 10-n and the packet transfer device 3-n are separated and connected to the backup packet transfer device 2 by switching.

In order to test the packet transfer device 3-n, a return circuit is formed on its output side, that is, on the line 7ny8n side, and this return circuit is formed by a maintenance person by changing connections.

Therefore, the work of changing connections is complicated, and there is a risk of erroneous connections.Furthermore, if the connections are repeated, the connection terminals may wear out, resulting in poor contact.

The present invention improves the conventional drawbacks as described above, and when switching from a currently used packet transfer device to a backup packet transfer device, a return circuit is automatically formed on the output side of the currently used packet transfer device. The purpose is to

Examples will be described in detail below.

FIG. 2 is a block diagram of an embodiment of the present invention.
Reference numerals 2-1 to 12-n are switch circuits composed of relays, transistors, etc. for forming a folding circuit, and the same reference numerals as in the other parts of FIG. 1 indicate the same parts.

The packet transfer devices 2.3i to 3-n accommodate an even number of full-duplex lines, and in this embodiment, -
#=O, i 2 lines 5, 6, 7-1 to 7 n, 8
-1,8-n, switch circuits 11,12-1~
12-n, the packet transfer devices 2, 3-1 to 3-n are separated from the packet transmission paths 9-1 to 9-n and 10-1 to 10-n by switch circuits 4-1 to 4-n. 2 lines 5, 6, 7-1~7 ny81~8 when
-n to form a folding circuit.

For example, when a failure occurs in the active packet transfer device 3-1 or during maintenance and inspection, the common control device 20
When the switch circuit 4-1 is controlled to switch and connect the backup packet transfer device 2 to the transmission paths 9-1 and 101 as shown in FIG. 3, the switch circuit 11 is turned off and the switch circuit 12-1 is switched off. is turned on, and the lines 71 and 8-1 accommodated in the packet transfer device 3-1 are connected by the switch circuit 12-1 to form a return circuit.

Then, the common control device 20 controls the packet transfer device 3-1 via the control line 21, and performs a return test in which, for example, data is sent from the line 7-1 and the data is received and processed on the line 8-1. , the operating state of the packet transfer device 3-1 is confirmed.

In the above-mentioned embodiment, there are currently n packet transfer devices 3-1.
~3- Although this is a case where one backup packet transfer device 2 is provided for n, it is of course applicable to a case where m backup packet transfer devices are provided.

As explained above, in the present invention, the currently used packet transfer devices 3-1 to 3-n are connected to the packet transmission lines 9-1 to 9-n.
, 101 to 10-n, a switch circuit is provided that forms a return circuit for two lines, so that
After switching between active and backup, a loopback circuit is automatically formed in the packet transfer equipment that was in use up until now, making it possible to perform loopback tests for fault isolation and maintenance inspection immediately after switching to active and backup. , it is possible to shorten the time required for troubleshooting and operation confirmation.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional backup switching device, FIGS. 2 and 3 are block diagrams of an embodiment of the present invention, and FIG. 3 shows a state of switching to a backup packet transfer device. . 1 is a backup switching device, 2 is a backup packet transfer device, 3-1
~3-n is the current packet transfer device, 4-1~4-n
are switch circuits, 5, 6, 71-7n, 81-8-0 are lines, 9-1-9-n. 10-1 to 10-n are transmission lines, 11, 12-1 to 12-
n is a switch circuit for forming a folding circuit, 20 is a common control device, and 21 and 22 are control lines.

Claims (1)

[Claims] 1 A single backup packet transfer device is provided for a plurality of packet transfer devices each accommodating and controlling an even number of full-duplex lines, and the packet transmission path is switched between the packet transfer device and the backup packet transfer device. In the backup switching device to be connected, a switch circuit that switches the currently used packet transfer device to the backup packet transfer device and forms a return circuit corresponding to two full-duplex lines accommodated in the currently used packet transfer device. A spare switching device characterized by being provided with.