JPH0426579B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data exchange having a line control device, and particularly to a test method for a backup line control device.

[Prior art] In conventional data exchanges, the main control system is duplicated, but the line control system is mainly single-layered.
The line control system was also duplicated in systems that could not afford to go down due to a failure in a part of the line control system. However, even if the line control system has a duplex or N+1 redundant configuration, the line is single-layered and it is necessary to confirm whether the spare line control system operates normally when connected to the line. In this situation, only the memory buffer in the standby line control device was turned around based on the command from the main control device, and sufficient consideration was not given.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, sufficient consideration is not given to checking the operation of the standby line control device in the standby state.
There was a problem that when switching from the current line controller to the backup line controller, it could not be guaranteed that some lines would not work or that all lines would not work unless the switch was actually made and tested.

An object of the present invention is to enable operation confirmation of a standby line control device when it is in a standby state.

[Means for solving problems]

The above object is achieved by providing a data return circuit in a backup line control device and a level conversion device interposed between the line control device and the line.

[Effect]

The loopback circuit in the standby line control device enables data loopback close to the line side interface of the same line control device, and the loopback circuit in the level conversion device enables data loopback close to the line, so that Enables operation confirmation.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 2 is a block diagram of a data switch according to the present invention. In Fig. 2, 1 is a main controller that controls the data exchange, 2, 3, and 4 are line controllers, 5 is a standby line controller, and 6, 7, and 8 are level converters for lines 19 and 20, respectively. , 21 and the line control devices 2 to 4.
The level converters 6, 7, 8 are also the line controller 5.
It is also becoming connected to 9 is a bus line connecting main controller 1 and line controllers 2 to 5;
10 to 12 are signal lines connecting the level converters 6 to 8 and the corresponding line control devices 2 to 4; 13 to 15;
are the level converters 6 to 8 and the spare line control device 5.
Signal lines 16 to 18 are control lines that connect the main control device 1 and the level conversion devices 6 to 8.

The operation will be briefly explained using FIG. Line 1
Data from 9 is sent to line control device 2 via level converter 6 and signal line 10. The line control device 2 analyzes the received data and, for example, if the data should be sent to the line 20, transmits the data to the line control device 3 via the bus signal line 9,
Line 2 via signal 11 and level converter 7
Send data to 0. On the other hand, if the line control device 2 is in trouble, the main control device 1 controls the line 19.
The data from the level converter 6, signal line 13,
It is transmitted to the line 20 through the route of the spare line control device 5, the bus signal line 9, the line control device 3, the signal line 11, and the level conversion device 7. Data flows through the backup line control device 5 only when switched under the control of the main control device 1, and normally data does not flow from the line.

Next, the configuration and operation of the folding circuit according to the present invention will be explained with reference to FIG. In Figure 1, the second
The same numbers as in the figure indicate the same parts. 22 to 24 are selectors, 25 to 27 are folding circuits, 28 is a data processing section, 29 is a control circuit, 30 and 31 are selectors, 32 is a folding circuit, 33 is a control circuit, and 34 is a processing section.

Under control performed from the main controller 1 via the signal line 16, the selector 30 is selected via the control circuit 33, and the selector 31 is in an inactive state. Data from the line 19 is transmitted to the line control device 2 via the selector 30. On the other hand, the backup line control device 5 is not transmitting or receiving data to the line, and in this state, the operation of the backup path is checked under the control of the main controller 1. That is, the main controller 1 controls the spare line controller 5 via the bus signal line 9, selects the selector 22 via the control circuit 29, controls the level converter 6 via the control line 16, and controls the The folding circuit 32 is made operational via the circuit 33. In this state, data is transmitted from the standby line control device 5, the returned data is received at the return circuit 32, and the data is compared to confirm whether or not the data transmission and reception up to the nearest point on the line is successful. Next, the selector 23 is selected via the control circuit 29, and the line control device 3 similarly checks whether the data transmission/reception up to the nearest line is successful.

In addition, if the level conversion device 8 is not installed and loopback cannot be performed at the nearest line, the selector 24 is selected via the control circuit 29, the loopback circuit 27 is made operational, and the loopback is confirmed at the exit of the backup line control device 5. .

Note that the test data may be transmitted from the main control device 1 to the backup line control device 5, and the returned data may be checked by the main control device 1.

〔Effect of the invention〕

According to the present invention, it is possible to check the return operation in the vicinity of the line while the standby line control device is in a standby state, thereby ensuring operation when switching due to a failure or the like.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a folding circuit according to an embodiment of the present invention, and FIG. 2 is a block diagram of a data exchanger according to the present invention. 1... Main control device, 2-4... Line control device, 5...
Line control device (spare), 6-8...level conversion device,
22-24, 30, 31...Selector, 25-2
7, 32, ... folding circuit.

Claims (1)

[Claims] 1 A plurality of line control devices having data processing units, a level conversion device interposed between the lines corresponding to the line control devices, and a failure in the line control device connected to all of the level conversion devices. A data exchange system comprising a backup line control device that operates in place of a line control device, and a main control device that controls all of the line control devices, wherein the backup line control device and the level conversion device are connected to each other. A first loopback circuit is provided at the end of the connected signal line on the line control device side, and a second loopback circuit is provided at the end of the signal line on the level conversion device side, and the main control device is controlled when the backup line control device is not in operation. The test data sent from the data processing section of the backup line control device is looped back by the first loopback circuit or the second loopback circuit via the signal line, and is then returned to the backup circuit. A line control device testing method characterized in that the data is returned to a data processing section of the line control device.