JPS62291237A - Loopback test system for data communication - Google Patents

Abstract

PURPOSE:To recognize a position, in which a loopback test is executed, and to facilitate the maintenance by multiple-transmitting the loop back instructing information with data and displaying it with a connecting destination data terminal interface device. CONSTITUTION:A data terminal interface device 1, when a terminal loopback instructing signal is received, makes a terminal folding means 10 into a loopback condition, multiplexes the data and a terminal loopback instructing signal from a communicating network loopback means 11 by a multiplexing circuit and sends them to an opponent terminal interface device. When the communicating network loopback means of the opponent terminal interface device is made into a loopback condition, a communicating network loopback instructing signal is transmitted. The terminal loop back instructing signal from the opponent terminal interface device is separated and displayed by a signal separating circuit 15. When the communicating network loopback instructing signal from the opponent is separated by the separating circuit 15, the communicating network loopback means 11 is made into the loopback condition and it is displayed.

Description

Detailed Description of the Invention Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a loopback test method in data communication for testing the normality of a communication network or equipment in data communication in a communication network using digital transmission. Regarding.

[Conventional technology]

In the conventional loop bank test method in data communication, test instructions are given to each data terminal device connected through a communication network using a switch or the like installed in the data terminal interface device. A loopback test within the own data terminal interface device based on this instruction.
This was done without notifying the connected data terminal interface device. Furthermore, when a call-back instruction is given to a connected data terminal interface device by remote control, the connected data terminal interface device performs a call-back operation without any display.

[Problem that the invention seeks to solve]

As mentioned above, the loopback test method in conventional data communication is a loopback test method between data terminal interface devices connected via a communication network. In some cases, the system notifies the operator of the instruction information, but does not indicate the state in which the loopback test is being performed. Therefore, the person operating the data terminal device connected to the data terminal interface device who has been given a return instruction should:
It is not possible to know in what state current loopback is being performed within the destination data terminal interface device, or whether data has reached the own data terminal interface device and is being looped back, and data communication suddenly becomes unavailable. There were problems in operation, such as confusion in terminal operations such as data loss, and the inability to accurately give loopback instructions in the opposite direction.

An object of the present invention is to provide a loopback test method for data communication that solves the above problems.

[Means for solving problems]

The loopback test method in data communication of the present invention has respective means for transmitting a terminal return signal at a terminal to a connection destination I\ and displaying each callback type according to a return signal received from a connection destination. . That is, the loopback test method for data communication of the present invention is such that when a data terminal interface device that is directly connected to a data terminal device in a digital transmission communication network and terminates a line of the communication network receives a terminal return instruction, a terminal return means for returning and outputting input information from the communication network; a communication network return means for returning and outputting input information from the communication network when receiving a communication network return instruction; and a terminal return instruction when receiving a terminal return instruction signal; to the terminal return means, and also outputs a terminal return signal indicating that the terminal is being returned to the communication network, while outputting a communication network return instruction signal to the communication network when a communication network return instruction signal is input. a signal multiplexing circuit for multiplexing and outputting the information output from the data terminal device to the communication network and the output signal of the return instruction transmitting means; and a signal multiplexing circuit for terminating the line of the communication network and multiplexing the signal multiplexing circuit. A line interface circuit that sends a signal output to a communication network and receives multiplexed signals from the communication network, and a signal separation circuit that separates the multiplexed signal received via this line interface circuit into information for the data terminal device and a return signal. If the return signal input from this signal separation circuit is a communication network return instruction signal, it outputs a communication network return instruction to the communication network return means and also outputs a communication network return display instruction, while the return signal indicates that the terminal is returning. In the case of a signal, the terminal has a return instruction reception control means that outputs a terminal return display instruction, and displays at least each piece of return information received from a connection destination.5 [Embodiment] Next, the present invention will be described with reference to the drawings. explain.

FIG. 1 is a professional diagram showing one embodiment of the present invention. In FIG. 1, a data terminal interface device 1 is directly connected to a data terminal device 2, terminates with a communication network 3 via a line, and terminal interfacing means 10. Communication network return means 11. Return instruction sending means 12. Signal multiplexing circuit 13. Line interface circuit 1-1° signal separation circuit 15. and a return instruction reception control means 16.

When terminal return instruction is received from the operating means (not shown) related to the own data terminal device or data terminal interface device, 10 returns the data information input from the data terminal device 2 to the same data terminal device. When the communication network return means 11 receives a communication network return instruction from the connected data terminal interface device connected via the communication M43, the communication network return means 11 returns the data information input from the communication W43 and sends the data information inputted from the communication W43 back through the communication network 3. Transmit to the data terminal interface device of the source.Terminal communication means 10
Both the communication network return means 11 and the communication network return means 11 may be the same means as in the prior art. The return instruction transmitting means 12 has been improved according to the present invention. That is, when the return instruction transmitting means 12 receives the terminal return instruction signal, it not only outputs the terminal return instruction to the terminal return means 10 but also transmits a terminal return signal indicating that the terminal is being returned to the communication network 3. Details will be described later with reference to FIG. The signal multiplexing circuit 13 receives transmission data information received from the data terminal device 2 via the terminal callback means 10 and the communication network return means 11 or received data information returned by the communication network return means 11 and from the callback instruction sending means 12. The output return signal is multiplexed and outputted from the line interface circuit 14/\. The line interface circuit 14 is connected to the communication network 3 by terminating the line, transmits the output of the signal multiplexing circuit 13 to the connected data terminal interface device, and connects the received input to the signal separation circuit 15. The signal separation circuit 15 connects the data information to the communication network return means 11 and outputs a return signal to the return instruction receiving/control means 16. The return instruction reception control means 16 is also improved according to the present invention.
A display instruction is output for each type of received return signal. Details will be described later with reference to FIG. The visual display for each type of fold 3% signal is displayed on a lamp, CRT display device, etc., and the display device is inside an instruction operation panel (not shown) that operates the fold instruction.
or be deployed nearby.

Therefore, for example, when a terminal callback instruction is given, it is displayed on the instruction panel of the connection destination, so that the connection destination only executes the communication network return instruction without instructing data information transfer. For example, when the communication network return display is recognized, it is possible to instruct only to return the terminal, thereby preventing unnecessary operations.

Next, referring to FIG. 2, the return instruction transmitting means 12 shown in FIG. 1 will be explained. FIG. 2 is a block diagram showing an example of a return instruction sending means.

In FIG. 2, the return instruction transmitting means 12 includes a terminal return control circuit 1211, a communication network communication network return means 22°, and a return signal transmitting circuit 123. When the terminal loopback control circuit 121 receives a terminal loopback instruction, it outputs the terminal loopback instruction as is, and also outputs a terminal loopback signal to be transmitted to the connection destination via the communication network. As in the conventional case, the communication network return instruction circuit 122 outputs a communication network return signal that causes the transmitted data information to be returned at a connection destination via the communication network. The return signal transmission circuit 123 outputs a terminal return signal and a communication network return instruction signal as return signals.

Next, referring to FIG. 3, the return instruction reception control means 1 of FIG.
6 will be explained. FIG. 3 is a block diagram showing an example of a return instruction reception control means. In FIG. 3, the return instruction reception control means 16 includes a received signal analysis circuit 1611, a communication network communication network return instruction 162, and a terminal return signal reception circuit. It has 163. The received signal analysis circuit 161 separates the return signal received via the communication network into a communication network return instruction signal and a terminal return signal, and outputs the signals. Communication network return control circuit 16
2 not only instructs communication network return, but also instructs communication network return display and lights up a lamp or displays characters on a CRT display device or the like. Further, the terminal loopback signal receiving circuit 163 is an additional circuit of the present invention, which receives the terminal loopback signal, instructs the display amount of the terminal loopback, and displays it on the display device. Transmitting means for transmitting a terminal return signal indicating that the terminal is being returned in response to an instruction, and display means for displaying whether the terminal is being returned or a communication network return instruction is received when the return signal is received. has been added.

In the above embodiment, the return instruction operating means and the return status display means are illustrated and explained as being disposed outside the data terminal interface device, but they may also be disposed inside the data terminal interface device. In addition to the return information from the connection destination, your own operation information may be additionally displayed.
Further, although switch contacts are shown in FIG. 1 on each of the folding means, a switch made of a semiconductor element may be used, and many known techniques can be used as conventional techniques, such as switching the switch to one of the transmitting and receiving paths. The present invention is not limited to the above description.

〔Effect of the invention〕

As explained above, the present invention multiplexes loopback instruction information with data and displays the information on the connected data terminal interface device, so that it is possible to know at which position the loopback test is being performed, and the data terminal interface This has an operational effect in that the operator or maintainer of the data terminal device connected to the device can efficiently perform a loopback test.

[Brief explanation of the drawing]

FIG. 1 is a Brolik diagram showing an embodiment of the loopback test method in data communication of the present invention, and FIGS.
The figure is a program diagram showing an example of partial details of FIG. 1. DESCRIPTION OF SYMBOLS 1... Data terminal interface device, 2... Data terminal device, 3... Communication network, 11... Communication network return means, 12... Return instruction transmitting means, 13...: Signal multiplexing 11 circuit , 14... line-interface circuit,
15... Signal separation circuit, 16... Return instruction reception control means. Part I: The last work of the village, where the wealth is broken, is 4.

Claims (1)

[Claims] A data terminal interface device that is directly connected to a data terminal device in a digital transmission communication network and terminates a line of the communication network, a terminal return means for returning and outputting input information from the data terminal device when receiving a terminal return instruction; A communication network return means that returns and outputs input information from a communication network when a network return instruction is received, and when a terminal return instruction signal is input, outputs a terminal return instruction to the terminal return means and indicates that the terminal is being returned. While outputting the terminal return signal to the communication network,
A return instruction transmitting means for outputting a communication network return instruction signal to the communication network when a communication network return instruction signal is input, and information output from the data terminal device to the communication network and the output signal of the return instruction transmitting means are multiplexed and output. a signal multiplexing circuit for
A line interface circuit that terminates the line of the communication network and transmits the multiplexed signal output of the signal multiplexing circuit to the communication network and receives the multiplexed signal from the communication network, and a line interface circuit that transmits the multiplexed signal output from the signal multiplexing circuit to the communication network and receives the multiplexed signal from the communication network; a signal separation circuit that separates information to the terminal device and return signal;
If the loopback signal input from this signal separation circuit is a communication network loopback instruction signal, it outputs a communication network loopback instruction to the communication network loopback means and also outputs a communication network loopback display instruction, while the loopback signal is a terminal loopback signal. A loopback test method for data communication, characterized in that the loopback test method includes a return instruction reception control means for outputting a terminal return display instruction, and displays at least each piece of return information received from a connection destination.