JPH0650872B2 - 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〕

According to the present invention, in the loop-shaped transmission line re-embedding method, the loop monitoring device gives a loopback instruction to the data transmission device before and after the failure point and specifies the loopback holding time, and the data transmission device at the failure point receives the failure recovery Send a recovery signal to the data transmission device in the loopback state,
If the loopback hold time has elapsed for this restoration signal, the data transmission device in the loopback state returns a restoration possible response signal, and after confirming that this response signal was received normally, loopback is performed. By releasing the loopback, the loopback is released and the normal operation can be restored without the instruction of the loop monitoring device or without stopping the operation of the loop.

[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.

[Reference: Japanese Patent Laid-Open 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.

The present invention solves the above-mentioned drawbacks, and provides a loop-shaped transmission line re-embedding method capable of canceling a loopback state at the time of failure recovery without the instruction of the loop monitoring device or without stopping the operation of the loop. The purpose is to do.

[Means for solving problems]

The present invention is a loopback type transmission line re-incorporation system,
The loop monitoring device includes means for designating a loopback holding time together with a loopback instruction, and each data transmission device sends a restoration signal to the data transmission device in the loopback state via the data transmission line when the failure is restored. Means, and when this recovery signal is received during loopback and the loopback holding time has elapsed, a recovery-enabled response signal is returned through the data transmission path, and this response signal is received normally. It is characterized by including means for canceling the loopback after confirming that.

[Operation] The loop monitoring device specifies the loopback holding time for holding the loopback state together with the instruction of the loopback by the specifying means. In the data transmission device, the sending means sends the restoration signal to the data transmission device in the loopback state when the failure is restored. The data transmission device in loopback is
When the recovery signal is received by the canceling means and the loopback holding time has elapsed, a recoverable response signal is returned, and after confirming that this response signal is normally received, the loopback is canceled. With the above operation, the loopback can be released without the instruction of the loop monitoring device or without stopping the operation of the loop.

〔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
And a data transmission system 1 including a plurality of data transmission devices 10 ₁ to 10 ₄ connected to the data transmission system, and a data transmission system connected to one of the plurality of data transmission devices 10 ₂ via a data transmission device external interface 4. In the case of the failure of 1, the loop monitoring apparatus 3 including means for giving a loopback instruction to the data transmission apparatus 10 before and after the failure point via the data transmission path 100 and the data transmission apparatus 10 ₁ , 10 ₃ , 10 ₄ respectively The information processing device 2 connected via the transmission device external interface 4 is provided.

Each data transmission device 10 has its own data transmission line.
100 _{1 connected} to the active system transmission line interface 12 and to the standby system data transmission line 100 _{2 connected} to the standby system transmission line interface 13 and includes means for performing loopback based on the loopback instruction. The control unit 11 is included.

Here, the feature of the present invention is that the loop monitoring device 3
Includes a means for designating the loopback holding time together with the loopback instruction, and the control unit of the data transmission device 10.
A recovery signal is sent to the transmission line interface 12 and the active data transmission line 100 ₁ or the standby transmission line interface 13 and the standby data transmission line 10 when a failure is recovered.
A means for sending to the data transmission device 10 in the loopback state via 0 ₂ and a response signal that can be restored when the restoration signal is received during the loopback and the loopback holding time has elapsed Loop interface 12 and the operating system data transmission line 100 ₁ or the standby system transmission line interface 13 and the standby system data transmission line 100 ₂ and then loop back after confirming that this response signal was received normally. It is to include means for releasing.

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 .

Figure 4 is a diagram showing the loop-back state of the loop-shaped transmission path reincorporation apparatus of the present invention, the data transmission device ₁₀₄ is disconnected from the loop fault, loopback at the data transmission device 10 _1, 10 ₃ The data transmission system 1 in a state is shown. In FIG. 4, as the information processing data as a packet frame, in the data transmission device 10 ₃ in the loopback state, from the standby data transmission line 100 ₂ to the active transmission line 100 ₁ ,
The data transmission path 100 ₁ of the active data transmission device 10 ₁
From the standby system 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 , and 10 ₁ of the data transmission system 1 in the loopback state shown in FIG. Data transmission device in loopback 10 ₃
, The packet frame is the data transmission path 10 of the standby system.
It is shown that the data is flowing from 0 ₂ to the data transmission path 100 ₁ of the operating system.

Similarly, in the data transmission device 10 ₁ in the loopback packet frame is shown to be flowing through the data transmission line 100 ₂ of the standby system from the data transmission line 100 ₁ of the active. 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 issuing 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 retention time, whether to ignore the recovery signal from the data transmission line 100 _1, 100 ₂ from a logically disconnected (state restoration physically by work connected) data transmission apparatus 10 ₄ This is the time and is set for the purpose of ignoring extra signals during 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,
A flow of a recovery signal indicating a loopback release 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 a 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,
Normal times to the data transmission apparatus ₁₀₃ of the adjacent via the data transmission line 100 ₁ of the active, also via the standby transmission line interface unit 13 _4, normal times via the data transmission line 100 ₂ of the standby system Te, is issued to the data transmission device 10 ₁ of the adjacent.

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.

If shows a loopback condition in the data transmission apparatus _103, the recovery signal issued by the control unit 11 ₄ of the transmission apparatus ₁₀₄ via the operation system transmission line interface portion 12 _4, the normal time operation system It is sent to the active transmission line interface unit 12 ₃ of the data transmission device 10 _{3 in} the loopback state via the transmission line 100 ₁ . In operation system transmission line interface portion 12 _3, the received signal After recognizing that it is a restoration signal, and notifies the own control unit 11 _3. Controller 11 ₃ which has received the notification, checks the loop-back retention time set during loopback specification has passed, when it has not reached the loopback retention time set ignores the restoration signal . 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, via a data transmission line 100 ₂ of normal time standby , through the standby transmission line interface portion 13 ₄ of the data transmission apparatus ₁₀₄ that has issued the recovery signal is sent to the control unit 11 _4. Control unit
In 11 _4, when receiving the response signal, and transmits the reply through the operating system transmission line interface unit 12 _4.
Loopback state data transmission apparatus ₁₀₃ of the release the loopback state when it receives the reply, incorporating a data transmission apparatus ₁₀₄ in a loop.

Similarly, the loopback of the data transmission device 10 ₁ is also canceled, and the data transmission device 10 ₄ is incorporated into a loop form as usual, resulting in the same result as the loopback cancellation instruction of the loop monitoring device 3. 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 has an excellent effect that the loopback can be released without the instruction of the monitoring device or without stopping the operation of the loop. Therefore, there is an advantage that it is possible to appropriately deal with an accidental failure of the monitoring device 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 ...... Operating system 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 loopback transmission including a loop monitoring device connected to one data transmission device and including a means for giving a loopback instruction to the data transmission device before and after the fault location via the data transmission path when the data transmission system fails. In the route re-incorporation method, the loop monitoring device includes means for designating 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 out to the data transmission device in the loopback state via the loopback holding time for receiving the restoration signal during the loopback. A loop-shaped transmission characterized by including means for returning a recoverable response signal via the above-mentioned data transmission path when it has elapsed, and for canceling the loopback after confirming that this response signal has been normally received. Road re-embedded method.