JPH0775352B2 - Loop-shaped transmission line reassembly method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used in a reassembly system of a loop-shaped data transmission line. In particular, if the loop monitoring device that maintains and monitors the data transmission line and the data transmission device fails during restoration of the data transmission device, the restored data transmission device is re-installed in the active data transmission line. It is about.

〔Overview〕

In the loop-shaped transmission line re-embedding method of the present invention, when each data transmission device receives a recovery signal during loopback, it inquires of the loop monitoring device whether loopback can be released, and a response signal indicating that the loop monitoring device can be released is sent. When the loop monitoring device is received normally, or after a lapse of a predetermined time after the loopback holding time has elapsed, a response signal indicating that recovery is possible is returned, and after confirming that this response signal was received normally, the loopback is released and the loop monitoring device operates normally. The loopback can be occasionally monitored, and the loopback state can be released without stopping the operation of the loop even when the loop monitoring device has a failure.

[Conventional technology]

Conventionally, the loop-shaped data transmission line re-embedded method sets a loopback state in the data transmission devices before and after (upstream and downstream) the faulty data transmission device when a data transmission device on the data transmission line fails. The faulty data transmission device is disconnected from the operating system to perform the fault recovery work.When the restoration work is completed, the loop monitoring device that is maintaining and monitoring the data transmission line and the data transmission device instructs the loopback cancellation. , The restored fault data transmission device was installed in the operating system. However, if the loop monitoring device breaks down during the recovery work, the loopback cancellation instruction cannot be issued, and unless the operation system is stopped, the failure is recovered but the data transmission device cannot be re-installed in the operation system.

[Patent Document 1] Japanese Unexamined Patent Publication No. 62-34440 [Problems to be Solved by the Invention] However, in such a conventional loop-shaped data transmission line re-incorporation method, a loop monitoring device When a failure occurs, it remains in a loopback state before and after the failed data transmission device (upstream and downstream), and even if the failure is recovered, the data transmission device is not returned to the active system while the loop is in operation. Since it cannot be installed, there is a drawback that the loopback state cannot be released unless the operation of the loop is stopped and the data transmission device in the loopback state is manually initialized.

In addition, as described above, in order to prevent the loop monitoring device from being unable to instruct loopback cancellation and being unable to re-install when the loop monitoring device fails, the loop monitoring device gives a loopback instruction to the data transmission device before and after the failure point. When the loopback hold time is set and the data transmission device in loopback receives the restoration signal of the faulty data transmission device and the loopback holding time has elapsed, it returns a response signal that can be restored and this response signal The inventor of the present application has proposed a method of canceling loopback after confirming that the signal is normally received (Japanese Patent Application No. 63-73883 and the drawings). However, this method has a drawback that the loop monitoring device cannot monitor the loopback at the normal time.

The present invention solves the above-mentioned drawbacks, and the loop monitoring device can normally monitor the loopback and can cancel the loopback state without stopping the operation of the loop even when the loop monitoring device fails. It is an object to provide a loop-shaped transmission line re-incorporation system.

[Means for solving problems]

The present invention relates to a data transmission system including a dual loop-shaped data transmission line composed of an active system and a standby system and a plurality of data transmission devices connected to the data transmission line, and one of the plural data transmission lines. A loop monitoring device connected to the data transmission device and including means for giving a loopback instruction and a specified loopback holding time to the data transmission device before and after the failure point via the data transmission path when the data transmission system fails. In the loop-shaped transmission line re-incorporation method provided,
Each of the data transmission devices includes a means for inquiring of the loop monitoring device whether loopback can be released when the recovery signal is received during loopback, and the loop monitoring device is configured to output the inquiry signal to the output of the inquiring device. The data transmission device includes means for transmitting a response signal indicating that cancellation is not possible within the loopback holding time, and a response signal indicating cancellation possible when exceeding the loopback holding time. A means for returning a recoverable response signal when a cancelable response signal is received in response to the output of the inquiry means, or a predetermined time after the loopback holding time has elapsed, and that the response signal is normally received. It is characterized by including a means for canceling the loopback after confirming.

[Action]

When the data transmission device receives the restoration signal of the faulty data transmission device by the inquiry means, it inquires of the loop monitoring device whether loopback can be released. The loop monitoring device sends a response signal indicating that cancellation is not possible within the loopback holding time to the output of the means for inquiring by means of transmitting, and returns a response signal indicating cancellation possible when the loopback holding time is exceeded. . The data transmission device returns a recoverable response signal when a cancelable reply signal is received in response to the output of the inquiry means by the returning means, or after a predetermined time has elapsed after the loopback holding time has elapsed, and a response is sent by the canceling means. Release loopback after confirming that the signal was received normally. With the above operation, the loop monitoring device can monitor the loop back when the loop monitoring device is normal, and the loop back can be released without stopping the operation of the loop even when the loop monitoring device has a failure.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. First
FIG. 1 is a block diagram of a loop-shaped transmission line re-embedding device according to an exemplary embodiment of the present invention. FIG. 2 is a block diagram of the data transmission device of the loop-shaped transmission path re-embedded device of the present invention. First
In FIG. 2 and FIG. 2, the loop-shaped transmission line re-embedded device is a double loop-shaped data transmission line 100 ₁ , 100 ₂ composed of an active system and a standby system and this data transmission line 100 ₁ , 100 ₂
A data transmission system 1 including a plurality of data transmission devices 10 ₁ to 10 ₄ connected to each other, and one of the plurality of data transmission devices
10 ₂ is connected via the data transmission device external interface 4 to the data transmission line 100 to indicate a loopback instruction and specify a loopback holding time when the data transmission system 1 fails.
Loop monitoring device 3 including means for giving to data transmission device 10 before and after the failure point via data transmission device, and data transmission devices 10 ₁ , 1
0 ₃ and 10 ₄ are each provided with an information processing device 2 connected via a data transmission device external interface 4.

Each data transmission device 10 has its own data transmission line.
A means for performing loopback on the basis of the above-mentioned loopback instruction, which is connected to 100 ₁ via the active transmission line interface unit 12 and connected to the standby data transmission line 100 ₂ via the standby transmission line interface unit 13. It includes a control unit 11 having.

Here, the feature of the present invention is that the data transmission device 10
When a failure is recovered, a recovery signal is sent to the control unit 11 of the loop via the active transmission line interface unit 12 and the active data transmission line 100 ₁ , or the standby transmission line interface unit 13 and the standby data transmission line 100 _2. It includes a means for sending to the data transmission device 10 in the back state and a means for inquiring the loop monitoring device 3 as to whether loopback can be released when the recovery signal is received during the loopback. Each data transmission device includes means for transmitting a response signal indicating that the release is not possible to the output within the loopback holding time and a response signal indicating that the release is possible when exceeding the loopback holding time. Each of the control units 11 of 10 receives a cancelable response signal to the output of the inquiring means, or at a predetermined time after the loopback holding time has elapsed. Means for returning a response signal can be recovered after the standing, the response signal is to include means for releasing the loopback after confirming that it was received successfully.

The operation of the loop-shaped transmission path reincorporating device having such a configuration will be described. FIG. 3 is a diagram showing a normal state of the loop-shaped transmission path re-embedding device of the present invention.

In FIG. 3, the data transmission line is an operational data transmission line.
It is composed of 100 ₁ and a standby data transmission path 100 ₂ , and in normal times, information processing data flows as packet frames to the operational data transmission path 100 ₁ .

FIG. 4 is a diagram showing a loopback state of the loop-shaped transmission line re-embedding device of the present invention. The data transmission device 10 ₄ is disconnected from the loop due to a failure, and the data transmission devices 10 ₁ and 10 ₃ are looped back. The data transmission system 1 in a state is shown. In FIG. 4, information processing data is used as a packet frame in the data transmission device 10 ₃ in the loopback state, from the data transmission line 100 ₂ in the standby system to the transmission line 100 ₁ in the active system, and the data transmission device 10 ₁ in the active system. It is shown that the data is transmitted from the data transmission line 100 _{1 of 1} to the data transmission line 100 ₂ of the standby system.

FIG. 5 is a diagram showing a loopback state of the data transmission device of the loop-shaped transmission line re-incorporation device of the present invention. FIG. 5 shows the internal structure of the data transmission devices 10 ₃ , 10 ₄ , 10 ₁ of the data transmission system 1 in the loopback state shown in FIG. In the data transmission device 10 ₃ that is in loopback, the packet frame is a standby data transmission line 100 ₂
It is shown that the data is flowing from the operating system to the data transmission path 100 ₁ of the operating system.

Similarly, in the data transmission device 10 ₁ in the loopback, it is shown that the packet frame is flowing from the data transmission line 100 _{1 of the} active system to the data transmission line 100 ₂ of the standby system. Data transmission apparatus ₁₀₄ is shown to be disconnected from the loop.

In the loopback state shown in FIGS. 4 and 5,
This is done by the loop monitoring device 3 giving a loopback instruction to the data transmission devices 10 ₃ and 10 ₁ . In this case, the time during which the loopback state is maintained is also designated by the loop monitoring device 3. This loopback holding time is ignored by the recovery signal from the data transmission device 10 ₄ which is logically separated from the data transmission paths 100 ₁ and 100 ₂ (physically connected by the restoration work). It is the time of whether or not it is set, and is set for the purpose of ignoring extra signals during the restoration work.

FIG. 6 is a diagram showing a flow of a recovery signal of the data transmission device of the loop-shaped transmission path re-embedding device of the present invention. In Figure 6,
The flow of a recovery signal indicating the release of the loopback is shown to the data transmission devices 10 ₃ and 10 _{1 in} which the data transmission device 10 ₄ separated from the loop is in the loopback state.

Recovery signal is created by the control unit 11 ₄ of the data transmission apparatus _104, via the operating system transmission line interface unit 12 _4, a normal time operation system adjacent data transmission device via a data transmission line 100 ₁ of 10 ₃ to and through the standby transmission line interface portion 13 _4, the data transmission line 1 of the normal time standby
It is issued to the adjacent data transmission device 10 ₁ via 00 ₂ .

FIG. 7 is a diagram showing a loopback cancellation procedure of the data transmission device of the loop-shaped transmission line re-embedding device of the present invention. With reference to FIG. 7, instead of the loop-back release method according loop monitoring unit 3 will be described loopback cancellation of the method according to the recovery of the transmission device _104.

When the data transmission device 10 ₃ indicates a loopback state, the restoration signal issued by the control unit 11 ₄ of the transmission device 10 ₄ is transmitted via the active transmission line interface unit 12 ₄ .
In normal times, it is sent to the operating system transmission line interface section 12 ₃ of the data transmission device 10 _{3 in} the loopback state via the operating system transmission line 100 ₁ . Working transmission line interface 1
In 2 _3, the received signal After recognizing that it is a restoration signal, and notifies the own control unit 11 _3. Control unit 1 that received the notification
1 ₃ transmits a signal for inquiring the loopback release whether by way of the transmission line 10 ₂ for the loop monitor 3. If the loop monitoring device 3 is down due to a failure, the control unit waits for a predetermined time because there is no response to the cancellation permission inquiry.
10 ₃ considers it as a loop monitoring device failure and checks whether the loopback holding time set when the loopback is specified has elapsed.If the set loopback holding time has not been reached, the recovery signal is ignored. To do. If you reach the set loopback retention time is the response signal can be recovered for the recovery signal via the standby transmission path interface 13 _3, the data transmission line 1 of the normal time standby
Data transmission device that issued a recovery signal via 00 ₂ 10 ₄
Control unit 11 ₄ via the standby transmission line interface unit 13 ₄ of
Sent to. The control unit 11 _4, when receiving the response signal, and transmits the reply through the operating system transmission line interface unit 12 _4. Loopback data transmission device
When 10 ₃ receives this reply, it releases the loopback state and incorporates the data transmission device 10 ₄ in a loop.

Further, similarly, the loopback of the data transmission device 10 ₁ is also canceled, and the data transmission device 10 ₄ is incorporated in a completely normal loop shape, whereby the same result as the loopback cancellation instruction of the loop monitoring device 3 is obtained. Loop monitoring device 3
It becomes unnecessary to release the loop back from the data transmission system, and even if a failure occurs in the loop monitoring device 3 during the recovery, the data transmission system 1 is not affected.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY As described above, the present invention is excellent in that the loop monitoring device can monitor the loopback at the normal time, and can cancel the loopback without stopping the operation of the loop even when the loop monitoring device has a failure. effective. Therefore, there is an advantage that it is possible to appropriately deal with an accidental failure of the loop monitoring apparatus that recovers in a short time.

[Brief description of drawings]

FIG. 1 is a block diagram of a loopback transmission line re-embedding device according to an embodiment of the present invention. FIG. 2 is a block diagram of a data transmission device of the loopback transmission line re-embedded device of the present invention. FIG. 3 is a view showing a normal state of the loopback transmission line re-embedded device of the present invention. FIG. 4 is a diagram showing a loopback state of the loopback transmission line re-embedding device of the present invention. FIG. 5 is a diagram showing a loopback state of the data transmission device of the loopback transmission line re-embedding device of the present invention. FIG. 6 is a diagram showing the flow of a recovery signal of the data transmission device of the loopback transmission line re-embedded 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 re-embedding device of the present invention. 1 ... Data transmission system, 2 ... Information processing device, 3 ... Loop monitoring device, 4 ... Data transmission device external interface, 10 ₁ to 10 ₄ ... Data transmission device, 11 ₁ , 11 ₃ , 11 ₄ ... …
Control unit, 12 ₁ , 12 ₃ , 12 ₄ ...... Operating transmission line interface unit (IF), 13 ₁ , 13 ₃ , 13 ₄ ...... Standby transmission line interface unit (SIF), 100 ₁ ...... Data transmission line, 100
₂ …… Standby data transmission line.

Claims (1)

[Claims] 1. A data transmission system including a double loop-shaped data transmission line comprising an active system and a standby system, and a plurality of data transmission devices connected to the data transmission line, and one of the plurality of data transmission systems. A loop monitoring device, which is connected to one data transmission device and includes means for giving a loopback instruction and a specified loopback holding time to the data transmission device before and after the failure point via the data transmission path when the data transmission system fails. In the loop-shaped transmission line re-incorporation method, each of the data transmission devices includes means for inquiring whether or not to cancel the loopback to the loop monitoring device when the restoration signal is received during the loopback. The monitoring device sends a non-cancellable reply signal to the output of the inquiring means within the loopback holding time, and When the loopback holding time is exceeded, the data transmission device includes means for transmitting a cancelable reply signal, and each of the above data transmission devices receives the cancelable reply signal for the output of the inquiring means, or Loop-like transmission characterized by including means for returning a recoverable response signal after a lapse of a predetermined time after the lapse of the loopback holding time, and means for canceling the loopback after confirming that the response signal is normally received. Road re-embedded method.