JPS6238642A - Line loopback cable identifying system - Google Patents

Abstract

PURPOSE:To decrease a test time by providing a means displaying a transmission control procedure and a means displaying the content of a system generation of a line to a line loopback cable so a to compare outputs from both the means thereby checking whether or not the line loopback cable is in matching with the transmission control means. CONSTITUTION:Before a line control signal is controlled to apply line open, and a command from a host device sets the content of a transmission control procedure coded subject to system generation in a main memory or a buffer memory to a display circuit 7 through a bus control circuit 3. Further, the command is decoded by a microprocessor 2 of a line control section 100 and the content of a transmission control procedure display circuit 17 is set to a line data register 6 by controlling a bus selection circuit 11. A comparison circuit 8 checks a line loopback cable is in matching with the transmission control means or not. The result is informed to the host device 3 through the bus control circuit 3 by controlling the line control signal as to whether line open is applied or not thereby checking it in advance.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a communication control device connected between an information processing device and a communication line, and in particular, the present invention relates to a communication control device that connects between an information processing device and a communication line, and in particular, uses a line return cable to Relates to line return cable identification method for testing.

〔overview〕

The present invention provides a line return cable identification method that includes means for displaying a transmission control procedure on the line return cable, means for displaying the contents of the system generation of the line, and means for comparing outputs from these two display means. The purpose of this test was to shorten testing time by checking whether the line return cable complied with the transmission control procedure.

[Conventional technology]

A line return cable identification method in a conventional communication control device is a method that only identifies whether or not a line return cable is connected.

[Problem that the invention seeks to solve]

In the conventional method described above, the line return cable is not identified for transmission control procedures, so even though the line return cable matches the contents of the system generation corresponding to the line address, line control cannot be performed. It was not possible to determine whether the line could not be opened due to a malfunction in the unit or line adapter, or whether the line could not be opened because the cable was not using a cable that matched the transmission control procedure for each line address generated by the system. For this purpose, read the contents of the system generation of the line address for which you are going to conduct the test,
After checking the procedure, I had to execute the line control command to turn the control signal on and off, check the status of the line wrap cable, and check whether the line wrap cable matched the procedure. . Therefore, there was a drawback that the test took a waste of time and the original test could not be performed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a line return cable identification method that can shorten test time by eliminating the above-mentioned drawbacks.

[Means for solving problems]

The present invention provides a line return cable identification method for a communication control device that performs a test using a line return cable, wherein means is provided for displaying a transmission control procedure type on the line return cable, and the content of the system generation of the line is displayed. and means for comparing the outputs from the two display means.

[For production]

The present invention enables the line return cable to control transmission by comparing the output from the means for displaying the transmission control procedure on the line return cable with the output from the means for displaying the contents of the system generation of the line. Since it is possible to check in advance whether the test conforms to the procedure, the test time can be shortened.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. This embodiment includes a microprocessor 2 that controls the entire line control unit 100, a bus interface 1 that interfaces with a host device, a bus control circuit 3 that controls the bus interface 1, and an internal bus 4 of the line control unit 100.
, a line address control register 5 that controls the address of the line adapter, and line adapters (0) and (1) 200
．． 201 and the line control unit 100; a system generation display circuit 7 that temporarily stores transmission control information related to system generation in the main memory or buffer memory; It is comprised of a comparison circuit 8 that compares the contents of the transmission control procedure display circuit 17 that displays the control procedure with the contents of the system generation display circuit 7, and a bus selection circuit 11 that outputs data to the line adapter data bus 10.

The feature of the present invention is that, in FIG. 1, a system generation display circuit 7, a comparison circuit 8, and a transmission control procedure display circuit 17 are provided.

The operation of this embodiment will be explained below. When testing a communication control device using a line return cable, for example, the line adapter (0) 200 and line adapter (1) 201 in Fig. 1, the line return cable in Fig. 2 or 3, The line return cable 18 to which the transmission control procedure type display shown in FIG. 4 is added is connected. Before opening the line by controlling the line control signal, the contents of the coded transmission control procedure stored in the main memory or buffer memory are sent to the system generation via the bus control circuit 3 in response to a command from the host device. The command is set in the display circuit 7, the command is decoded by the microprocessor 2 of the line control unit 100, and the address specified by the command is given to the line address decoding circuit 12 through the line address control register 5 and line adapter address bus 9. The procedure type displayed on the line return cable, that is, the transmission control procedure display circuit 17
The content of is set in the line data register 6 by controlling the bus selection circuit 11, the comparison circuit 8 checks whether the line return cable is suitable for the transmission control procedure, and the result is sent to the upper level by the bus control circuit 3. Inform the device and check in advance whether the line can be opened by controlling the line control signal.

In addition, the procedure identification indicators A, B, and C in FIG. 4 are "0".
In the combination of level and level "1", "000" indicates an asynchronous half-duplex procedure, roolJ indicates no procedure, roloJ indicates a simple procedure, and ro 11J indicates frame synchronization.

〔Effect of the invention〕

As explained above, the present invention has the effect of shortening the test time by comparing the type of transmission control procedure of the line return cable and the content of system generation using the above means.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. FIGS. 2 and 3 are connection diagrams showing embodiments of line return cables. FIG. 4 is a circuit diagram showing details of the transmission control procedure display circuit of FIG. 1. DESCRIPTION OF SYMBOLS 1... Bus interface, 2... Microprocessor, 3... Bus control circuit, 4... Internal bus, 5...
... Line address control register, 6... Line data register, 7... System generation display circuit,
8... Comparison circuit, 9... Line adapter address bus, 10... Line adapter data bus, 11... Bus selection circuit, 12... Line address decoding circuit, 13
... Transmission control circuit, 14... Reception control circuit, 15.
... Peripheral control circuit, 16... Transmission/reception drive circuit, 17.
...Transmission control procedure display circuit, 18...Line return cable, 100...Line control section, 200...Line adapter (0), 201...Line adapter (1).

Claims (1)

[Claims] (1) In a line return cable identification method for a communication control device that performs testing using a line return cable, a means for displaying the transmission control procedure type on the line return cable is provided, and a means for displaying the contents of the system generation of the line. and means for comparing outputs from the two display means.