JP2871816B2 - Redundant system switching status monitoring method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary of the Invention] The present invention relates to a method for monitoring a switching state between an active system and a non-active system in a redundant configuration system. The purpose of the present invention is to provide a switching state monitoring method in which the detection data of the system and the actual operation / non-operation state of each system are coincident with each other. And send them to each
The monitoring processor fetches the system selection information from the transmission device panel of each system to determine the operation / non-operation state of each system, and records the determination result in the operation management table. When it is not indicated that only one system is in the operation state, the record of the operation management table is configured to remain unchanged from the previous state.

[Industrial applications]

The present invention relates to a switching state monitoring method in a redundantly configured system.

With the recent advancement of transmission equipment functions, enhancement of equipment monitoring,
For high reliability, it is required to take a redundant configuration of the transmission panel. Therefore, it is necessary to determine which of the system 0 and system 1 is in operation.

[Conventional technology]

In a redundant communication system, two systems (0 system and 1 system) are used.
A transmission line and a transmission apparatus of (system) are prepared, and one of them, for example, system 0 is selected by the selector and set as active (operating), and the other system, in this example, system 1 is set as standby (non-operating). If a failure occurs in the active system, switch the system with the selector,
In this example, communication is continued with system 1 as the active system and system 0 as the standby system. Each transmission device and selector can be inserted and removed as a panel having an independent unit structure.

In such a system, which is currently used is determined based on the information of the selector. That is, the selector panel has switch switching information. If the 0-system transmission panel is selected, the 0-system is set to 1 (selected) and the 1-system is set to 0 (unselected). The monitoring processor obtains the switch information of the selector panel and determines which system is in operation.

By the way, each panel can be inserted and removed in the active state of the system, that is, in a power-on state, and the selector panel is no exception. When the selector panel is pulled out, the processor cannot take in the switch information from the selector panel, so the response time is over, and in normal cases, the system 0 is 0 (non-operation), and therefore the system 1 is 1 (operation). ) Is performed. Next, when the selector panel is inserted, the processor can take in the switch information of the selector panel again. If the contents of the fetched switch information are not different from those before, the system 0 is 1 (operation) and the system 1 is 0 (non-operation). As a result, in the monitoring of the processor, it is recognized as if the current use has changed from system 0 to system 1 to system 0.

[Problems to be solved by the invention]

As described above, in the conventional redundant system operation system determination method, since the 0 system operation or the 1 system operation is determined based on the switch information of the selector panel, when the selector panel is removed, the processor switches the selector switch. Information cannot be taken in, and the 0 system is determined to be 0 and the 1 system is determined to be 1. When the selector panel is re-inserted in such a state, the switch information enters the processor again and is determined to be in an operation state according to the switch information. What was determined to be system operation appears to have returned to system 0 again. However, such switching is not actually performed, but is merely an apparent change caused by the selector panel being inserted and removed in the active state. As described above, in the conventional method, when the selector panel is pulled out, there is a problem that the actual monitoring information of the processor does not match the operation state.

If the selector panel is removed, both system 0 and system 1 will be disconnected, and therefore will be practically non-operational. However, removal of the selector panel itself will be separately detected and processed with a selector failure. It is desirable that the switching state monitoring information is not affected by the insertion and removal of the selector panel,
It is not preferable that the system 0, which was in operation, is regarded as non-operation.

An object of the present invention is to improve such a point and to provide a switching state monitoring method capable of making the switching state of the monitoring information coincide with the actual operation state even when the selector panel is pulled out. .

[Means for solving the problem]

As shown in FIG.
The monitoring point (storage unit) L ₀ to provided, also 1-system transmission apparatus panel
Monitoring point 14 (storage unit) L ₁ is provided, the monitoring point L ₀ of the system selection information of the transmission device panels 12 from the selector panel 10,
It sent to the L ₁ to be stored.

The processor CPU monitors the monitoring points L ₀ and L _{1 on the} transmission device panels 12 and 14.
The operation and non-operation of each system are determined based on this information. At this time, if there is an inconsistency between the contents indicated by the information of each system such that each system is inactive or both are in operation, the monitoring information switching state is kept as before, It does not change.

TL ₀ is a transmission line (optical fiber) and is a transmission device panel 12 or 0
Configure the system, also TL ₁ constitutes a transmission device panel 14 as one system at a transmission line (optical fiber), these 0-system and 1-system is a redundant system. Selector panel 10 is set to 0 by switch SW.
Select system / system. Processor CPU collection map 16
And an operation / non-operation table 18.

[Action]

The processor CPU monitors the monitoring points L ₀ and L _{1 on the} transmission device panels 12 and 14.
Is periodically taken in and stored in the corresponding area of the table 18. Now, 0 system non-operational, the appropriate highway when one system is to operate table 18, the operation / non-operational information IH _W in this example is 0,1. As a result, the system 0 is determined to be inactive and the system 1 is determined to be in operation. Note the redundant system is generally in a plurality, each system is called a highway (H _W).

When the selector panel 10 is removed, there is no system selection (switching) information from the panel to the transmission device panels 12, 14. Where the information of the monitoring point L ₀ of the transmission device panel 12 in this embodiment also becomes 0, operational / non-operational information IH _W becomes 0,0. Either 0 system or 1 system should be selected.
0 (inactive) is a contradiction. In this case, the processor changes the state to the invariable state, and in this example, the 0-system is not operated,
1 system operation.

Then the selector panel 10 is inserted again, the system selection information is sent to the transmission unit panels 12, monitoring point L _0, information L ₁ is if remains of the previous _{L 0 = 0, L 1 =} 1, before In the opposite case, L ₀ = 1 and L ₁ = 0, which are fetched and the corresponding area of the table 18 is set to 0,
1 or 1,0. Thus, it is determined that the system 1 is selected and the system 0 is selected.

Thus, according to the present invention, it is possible to provide a switch bit addition / switching state determination method that can match the actual operation state even when the selector panel is pulled out.

〔Example〕

FIG. 2 shows a flowchart of the operation / non-operation determination processing of the present invention. Processor As shown, with information of the monitoring point L ₀ of 0 based panel L ₀ column of table 18 of the work area, also contain information of the monitoring point L ₁ of 1 line panel to L ₁ column of the table. And in L ₀ column of table 1, L ₁ field is set to 0-based operation if 0, L ₀ column is L ₀ field is 1-based operation if 1 0. If both L ₀ and L ₁ are 0 or both L ₀ and L ₁ are 1 and this is a contradiction, the operation state is not changed and the operation state is maintained.

The sequence in this process is as shown in Table 1 below.

Table 1 Occurrence of REC (failure) in system 0 during operation of system 0, switch operation to system 1 Switch to switch to system 1 Recovery: operation of system 0 Occurrence: system 0 not operating Here, the selector is inserted. Even if the selector panel is inserted and removed in this way, no change occurs in the monitoring of the operation state.
When the selector panel is inserted again, the system returns to the system 1 and the monitoring information in the operation state is unnecessarily fluttered.

When the processor determines that the system is in operation 0 or not in the operation / non-operation determination, the processor enters L ₀ ACT into the collection map 16 when it determines that the system is in operation ₁ or L ₁ ACT ·
·························································································································· −− From the data of this collection map,
Know the non-failure, non-operational failure / non-failure, and use it as the base for system switching.

The transmission device panels 12 and 14 are, for example, 50 MHz optical transmission devices, and a plurality of these sets are connected to a 600 MHz multiplexer (not shown).

In the conventional method, the switch SW information is stored in the selector panel 10, and the processor takes in the information to determine the operation / non-operation.

〔The invention's effect〕

As described above, according to the present invention, there is no flapping of the operation state due to the insertion / removal of the selector panel. Is big.

[Brief description of the drawings]

FIG. 1 is a principle diagram of the present invention, and FIG. 2 is a flowchart showing an embodiment of the present invention. In FIG. 1, TL is a transmission line, 12 and 14 are transmission device panels, and 10 is a selector panel.

Claims (1)

(57) [Claims] A transmission line and a transmission device are provided in a plurality of systems and selected by a selector. Each of the selector and the transmission device is a panel having an independent unit structure, and each panel can be inserted into and removed from the system in an active state of the system. In the redundant system switching state monitoring method, system selector information indicating the presence or absence of system selection is transmitted from the selector panel (10) to the transmission device panels (12, 14) of each system and stored therein, and the monitoring processor The system selection information is fetched from the transmission equipment panel of each system to determine the operation / non-operation status of each system, and the determination result is recorded in the operation management table. A method for monitoring a switching state of a redundant system, characterized in that, when it does not indicate that the system is in the operation state, the record of the operation management table is kept unchanged from the previous state.