JPH01245734A - Reassembling system for loop shape transmission line - Google Patents

Abstract

PURPOSE:To release the loopback without being commanded by a monitor and stopping the operation of the loop by providing a means returning a reply signal representing recovery enable through a data transmission line and releasing the loopback after the normal reception of the reply signal is confirmed. CONSTITUTION:A loop monitor 3 connecting to a data transmitter 102 designates a loopback holding time of holding the loopback state together with the command of loopback in a data transmission system provided with duplex loop data transmission lines 1001, 1002 comprising the operating system and the standby system and with plural data transmitters 101-104 connecting to the data transmission lines. The data transmission equipment sends a recovery signal at the recovery of a fault to the data transmitter in the loopback state. The data transmission equipment during loopback receives the recovery signal and returns the reply signal of recovery enable if the loopback hold time elapses and release the loopback after the normal reception of the reply signal in confirmed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applied to a reassembly method of a loop-shaped data transmission path. In particular, if a loop monitoring device that maintains and monitors data transmission paths and data transmission equipment fails during data transmission equipment restoration work, a method for re-integrating the restored data transmission equipment into the operational data transmission path. It is related to.

〔overview〕

The present invention provides a loop-shaped transmission path reassembly method in which a loop monitoring device gives a loopback instruction to the data transmission devices before and after a fault location and specifies a loopback retention time, and the data transmission device at the fault location A recovery signal is sent to the data transmission device in the loopback state, and if the loopback retention time has elapsed in response to the recovery signal, the data transmission device in the loopback state returns a response signal indicating that recovery is possible. By canceling the loopback after confirming that the signal has been received normally, the loopback can be canceled and normal operation can be resumed without following instructions from the loop monitoring device or without stopping loop operation. It was made so that it could be restored.

[Conventional technology]

Conventionally, in the loop-shaped data transmission path reassembly method, when a data transmission device on the data transmission path becomes faulty, the data transmission devices before and after (upstream and downstream) the faulty data transmission device are put into a loopback state. The faulty data transmission equipment is isolated from the active system and the fault recovery work is carried out. When the restoration work is completed, the loop monitoring equipment that maintains and monitors the data transmission path and data transmission equipment issues an instruction to cancel the loopback. The restored faulty data transmission equipment was incorporated into the operational system. However, if the loop monitoring device malfunctioned during the recovery process, it became impossible to issue an instruction to release the loop hack, and unless the active system was shut down, the data transmission device could not be reinserted into the active system even after the failure was recovered.

Reference: Japanese Patent Application Laid-Open No. 62-34440 [Problems to be Solved by the Invention] However, in such a conventional loop-shaped data transmission line re-assembly method, the loop monitoring device is If a failure occurs, the loopback state will remain before and after (upstream and downstream) the failed data transmission device, and even if the failure is recovered, the data transmission device will not return to the active system while the loop is in operation. Since it is no longer possible to integrate the system, there is a drawback that the loopback state cannot be released unless the loop operation is stopped and the data transmission device in the loopback state is manually returned to the initial state.

The present invention solves the above-mentioned drawbacks by providing a loop-shaped transmission line re-assembly method that can release the loopback state at the time of failure recovery without following instructions from a loop monitoring device or without stopping loop operation. The purpose is to provide.

[A must-have method to solve problems]

The present invention provides a loopback transmission path reassembly method that includes:
The loop monitoring device includes means for specifying a loopback holding time together with a loopback instruction, and each data transmission device sends a recovery signal to the data transmission device in the loopback state via the data transmission path when a failure is recovered. means, and when this recovery signal is received during loopback and the loopback holding time has elapsed, a response signal indicating that recovery is possible is returned via the data transmission path, and this response signal is normally received. The method is characterized in that it includes means for canceling the loopback after confirming that the loopback is correct.

[Effect]

The loop monitoring device uses a specifying means to specify a loopback instruction and a loopback holding time for holding the loopback state. In the data transmission device, the sending means sends a recovery signal to the data transmission device in the loopback state when a failure is recovered. The data transmission device during loopback is
The canceling means receives a recovery signal, returns a response signal indicating that recovery is possible if the loopback holding time has elapsed, and cancels the loopback after confirming that the response signal has been received normally. Through the above operation, loopback can be canceled without depending on instructions from the loop monitoring device or without stopping loop operation.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. 1st
The figure is a block diagram of a loop-shaped transmission line reassembly device according to an embodiment of the present invention. FIG. 2 is a block diagram of the data transmission device of the loop-shaped transmission line reassembly device of the present invention. 1st
In the figures and FIG. 2, the loop-shaped transmission line reassembly device includes a double loop-shaped data transmission line 1001 and 1002 consisting of an active system and a standby system, and this data transmission line 10.
Multiple data transmission devices 1 connected to 01.1002
0. - 104 and one data transmission device 102 out of the plurality of data transmission devices 102 through the data transmission device external interface 4. A loop monitoring device 3 including means for providing data to the data transmission devices 10 before and after the failure point via the data transmission device 100.103.
104 and a data transmission device external interface 4, respectively.
The information processing device 2 is connected to the information processing device 2 via the information processing device 2.

Each data transmission device 10 is connected to an active data transmission path 100 via an active transmission path interface 12, and is connected to a standby data transmission path 1002 via a standby transmission path interface 13, and is connected to the above-mentioned loop. The control unit 11 includes means for performing loopback based on a backing instruction.

Here, the feature of the present invention is that the loop monitoring device 3
includes means for specifying a loopback hold time together with the loopback instruction, and transmits a recovery signal to the control unit 11 of the data transmission device 10 at the time of failure recovery to the active transmission line interface 12 and the active data transmission line 100. , or means for transmitting data to the data transmission device 10 in the loopback state via the standby transmission path interface 13 and the standby data transmission path 100°, and means for receiving the recovery signal during the loopback and maintaining the loopback holding time. If the period has elapsed, a response signal indicating that recovery is possible is returned via the active transmission line interface 12 and the active data transmission line 1001, or the standby transmission line interface 13 and the standby data transmission line 1002, and this response signal is returned. The method includes means for canceling the loopback after confirming that the message has been received normally.

The operation of the loop-shaped transmission line reassembly device having such a configuration will be explained. FIG. 3 is a diagram showing a normal state of the loop-shaped transmission line reassembly device of the present invention.

In FIG. 3, the data transmission path consists of an active data transmission path 1001 and a standby data transmission path 1002, and under normal conditions, information processing data flows as packet frames to the active data transmission path 100□. There is.

FIG. 4 is a diagram showing a loopback state of the loop-shaped transmission line reassembly device of the present invention, and shows the data transmission device 10. is disconnected from the loop due to a failure, and the data transmission device 10. ．． 10
3 shows the data transmission system 1 in a loopback state. In FIG. 4, information processing data is transferred as a packet frame from a standby data transmission path 1002 to an active transmission path 100 in a data transmission device 103 in a loopback state. Then, the data transmission device 10□ connects the active data transmission path 100 to the standby data transmission path 10.
02 is shown.

FIG. 5 is a diagram showing a loopback state of the data transmission device of the loop-shaped transmission line reassembly device of the present invention. FIG. 5 shows the data transmission device 10 of the data transmission system 1 in the loopback state shown in FIG. ．． 10. ．． 10. It shows the internal configuration of. In the data transmission device 103 during loopback, packet frames are shown flowing from the standby data transmission path 100° to the active data transmission path 1001.

Similarly, in the data transmission device 1 during loopback, packet frames are shown flowing from the active data transmission path 100 to the standby data transmission path 1002. Data transmission device 104 is shown disconnected from the loop.

In the loopback state shown in FIGS. 4 and 5,
The data transmission device 103.10.
This is done by issuing a loopback instruction to the In this case, the loop monitoring device 3 also specifies the time period during which this loopback state is maintained. This loopback holding time determines whether or not to ignore the recovery signal from the data transmission device 104 (a state in which the data transmission path 10S, 100□ is logically disconnected but is physically connected due to recovery work). This is set for the purpose of ignoring extraneous signals during recovery work.

FIG. 6 is a diagram showing the flow of restoration signals in the data transmission device of the loop-shaped transmission line reassembly device of the present invention.

FIG. 6 shows the flow of a recovery signal indicating loopback release for the data transmission device 103.10 in which the data transmission device 104, which has been disconnected from the loop, is in the loopback state.

The recovery signal is sent to the control unit 11. of the data transmission device 104. is created by the active transmission line interface unit 124, and in normal conditions is transmitted to the adjacent data transmission device 103 via the active data transmission line 1001, and to the standby transmission line interface unit 13. During normal times, the data transmission device 10. is connected to the adjacent data transmission device 10. issued to.

FIG. 7 is a diagram showing a loopback cancellation procedure of the data transmission device of the loop-shaped transmission line reassembly device of the present invention. Using FIG. 7, a method for canceling a loopback by restoring the transmission device 104, rather than a method for canceling the loopback by the loop monitoring device 3, will be described.

If the data transmission device 103 indicates a loopback state, the transmission device 10. The recovery signal issued by the control unit 114 of the active transmission line interface unit 12
4, the active transmission line 100. The data is sent to the active transmission path interface section 123 of the data transmission device 103 in the loopback state. When the active transmission line interface section 123 recognizes that the received signal is a restoration signal, it notifies its own control section 113. The control unit 113 that has received the notification checks whether the loopback holding time set at the time of loopback designation has elapsed, and if the set loopback holding time has not been reached, ignores the recovery signal. When the set loopback holding time has been reached, a response signal indicating that recovery is possible is sent to the recovery signal via the standby transmission line ink face 133, and normally via the standby data transmission line 1002. The recovery signal is sent to the control unit 114 via the standby transmission path interface unit 134 of the data transmission device 104 that issued the recovery signal. In the control unit 114,
When receiving this response signal, it transmits the response via the active transmission line interface section 124. When the data transmission device 103 in the loopback state receives this response, the data transmission device 103 releases the loopback state, and the data transmission device 10
Incorporate ゜ in a loop.

Similarly, the data transmission device 10. By also canceling the loopback of , and incorporating the data transmission device 104 into a completely normal loop, the same result as the loopback cancellation instruction from the loop monitoring device 3 is obtained, and the loopback from the loop monitoring device 3 is canceled. This is no longer necessary, and even if a failure occurs in the loop monitoring device 3 during restoration, the data transmission system 1 will not be affected.

〔Effect of the invention〕

As explained above, the present invention has the excellent effect of being able to cancel the loopback without depending on instructions from the monitoring device or without stopping the operation of the loop. Therefore, there is an advantage that an accidental failure of the monitoring device that can be recovered in a short time can be appropriately dealt with.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a loop pack transmission line reassembly device according to an embodiment of the present invention. FIG. 2 is a block diagram of the data transmission device of the loopback transmission path reassembly device of the present invention. FIG. 3 is a diagram showing a normal state of the loop hack transmission line reassembly device of the present invention. FIG. 4 is a diagram showing a loopback state of the loopback transmission line reassembly device of the present invention. FIG. 5 is a diagram showing a loopback state of the data transmission device of the loopback transmission path reassembly device of the present invention. FIG. 6 is a diagram showing the flow of restoration signals of the data transmission device of the loopback transmission path reassembly device of the present invention. FIG. 7 is a diagram showing a loopback cancellation procedure of the data transmission device of the loopback transmission line reassembly device of the present invention. 1...Data transmission system, 2...Information processing device, 3...
- Loop monitoring device, 4... Data transmission device external interface, 101-104... Data transmission device, 11
1.113.114...control unit, 12□, 123.1
24...Operational transmission path ink face unit (IP),
130.133.13. . . . Standby system transmission path interface unit (SIF), 1'0 (L: Active system data transmission path, 1002: Standby system data transmission path.

Claims (1)

[Claims] 1. A data transmission system including a double loop-shaped data transmission path consisting of an active system and a standby system, and a plurality of data transmission devices connected to this data transmission path; a loop monitoring device that is connected to one of the data transmission devices and includes means for giving a loopback instruction to the data transmission devices before and after the point of failure via the data transmission path in the event of a failure in this data transmission system; In the back type transmission path reassembly method, the loop monitoring device includes means for specifying a loopback holding time together with the loopback instruction, and each of the data transmission devices transmits a recovery signal to the data at the time of failure recovery. means for sending a response signal indicating that recovery is possible when the recovery signal is received during loopback and the loopback holding time has elapsed; A loop-shaped transmission path re-assembly method characterized in that the method includes means for canceling the loopback after confirming that the response signal is normally received.