JPS62289029A - Test system for communication control unit - Google Patents

Abstract

PURPOSE:To attain the operation confirmation of a standby communication control unit in the standby state by providing a loopback circuit to a level converter side end of a signal lien tying the standby communication control unit and a level converter. CONSTITUTION:A main controller 1 controls the standby communication control unit 5 via a bus signal line 9, selects a selector 22 via a control circuit 29 and controls the level converter 6 via control lien 16 an activates the loopback circuit 32 via a control circuit 33. A data is sent from the standby communication control unit 5 in this state, a loopback data is received by the circuit 32 to collate the data thereby confirming the propriety of the data transmission/ reception just near the line. Then the selector 23 is selected by the control circuit 29 to apply the propriety communication for the data transmission/ reception the line similarly to the line controller 3.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a data exchanger having a line control device,
In particular, it relates to testing methods for backup line control equipment.

[Conventional technology]

In conventional data exchanges, the main control system is duplexed, but the line control system is mainly single-layered, and in systems where failures due to failures in some line control systems cannot be tolerated,
The line control system was also duplicated. However, the line control system is 2
Even if you have a redundant configuration of multiplexing or N+1 multiplexing, the line is single-layered, and it is necessary for the main controller to check whether the backup line control system operates normally when connected to the line. This was merely a matter of turning back the memory buffer in the standby line control device based on the command, and was not given sufficient consideration.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, sufficient consideration is not given to checking the operation of the backup line control device in the standby state, and some lines may not operate when switching from the current line control device to the backup line control device. There was a problem in that it could not be guaranteed that all lines would not work unless it was actually switched 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 converter enables loopback close to the line, so operation in the standby state is Enables 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 invention. In FIG. 2, 1 is a main controller that controls the data exchange, 2, 3.4 are line controllers, 5 is a backup line controller, and 6, 7.8 are level converters for lines 19 and 20, respectively. .21 and the signal levels of the line control devices 2 to 4 are converted.

The level conversion devices 6, 7.8 are also connected to the line control device 5. 9 is a bus line that connects the main controller 1 and line controllers 2 to 5, 10 to 12 are signal lines that connect the level converters 6 to 8 and the corresponding line controllers 2 to 4, and 13 to 15 are level lines. Signal lines 16 to 18 connect the conversion devices 6 to 8 and the standby line control device 5, and control lines 16 to 18 connect the main control device 1 and the level conversion devices 6 to 8.

The operation will be briefly explained using FIG. Data from line 19 is sent to line controller 2 via level converter 6 and signal line 10. The line control device 2 analyzes the received data, and if it is data that should be sent to the line 20, for example, transmits the data to the line control device 3 via the bus signal line 9, and the signal line 11 and the level converter 7. Send data to line 3/20 via -6 If the line control device 2 has a failure, the data from the line 19 is transferred to the level converter 6.6 under the control of the main control device 1. Signal line 13° Spare line control device 5. Bus signal line 99 line control device 3. The signal is transmitted to line 20 via signal line 1]- and level converter 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 FIG. 1, the same numbers as in FIG. 2 indicate the same parts. 22 to 24 are selectors, 25 to 27 are return circuits, 28 is a data processing section, 29 is a control circuit, 3
0.31, the selector 32 is a folding circuit, 33 is a control circuit, and 34 is a processing section.

Through control performed from the main controller 1 via the signal line 16,
Selector 30 is selected via control circuit 33, and selector 31 is inactive. Data from the line 19 is transmitted to the line 4 controller 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, the quality of data transmission and reception up to the nearest line is checked.

In addition, if the level conversion device 8 is not installed and loopback to the nearest line cannot be performed, 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 loopback operation in the vicinity of the line while the spare line control device is in standby mode.
Operation is guaranteed when switching occurs due to a failure, etc.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a folding circuit which is an embodiment of the present invention.
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 25-27
．． 32. ...Return circuit. , 7°

Claims (1)

[Claims] 1. A plurality of line control devices, a level conversion device interposed between the lines corresponding to the line control devices, and a line control device connected to all of the level conversion devices and in the event of a fault in the line control device; A signal line connecting the standby line control device and the level conversion device in a data exchange system comprising a standby line control device that operates in place of the line control device and a main control device that controls all of the line control devices. A return circuit is provided at the end of the level converter side of the signal line, so that when the standby line control unit is not in operation, the test data sent from the standby line control unit is transmitted through the signal line under the control of the main control unit. A line control device testing method characterized in that the line is looped back through the loopback circuit and then returned to the standby line control device.