JPH0534864B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-speed data communication monitoring device that monitors the communication status in bidirectional high-speed data communication.

[Prior Art] For example, in conventional high-speed data communication using optical space transmission, methods for determining whether or not transmitted data from one's own station have been transmitted to the other station include checking whether or not there are data errors in the data to be sent or received, and whether or not the line Many methods have been used for monitoring by transmitting and receiving information such as the status of

[Problems to be Solved by the Invention] However, according to the above method, it is necessary to add monitor data compared to simple data transmission and reception, which reduces transmission efficiency and requires software support. becomes complicated. Furthermore, in communications where transmission and reception operations are performed completely independently, it is difficult to add monitor data.

Another possible method is to transmit the transmitted data from one's own station to the other station, and the other station receives the returned data and compares it with the transmitted data, but this method requires twice as many high-speed communication lines, which is uneconomical.

The present invention was made in view of the above-mentioned circumstances, and does not require a data monitor line.
In addition, we have developed a high-speed data communication monitoring device that can monitor the status of data transmission and reception using simple means without complicating software support by adding monitor data to the transmitted data. The purpose is to provide.

[Means and effects for solving the problem] The present invention provides a device for bidirectional high-speed data communication between two distant points, and a signal transmission device having one channel each of a high-speed line and a low-speed line as transmission equipment. By using equipment to transmit communication data over a high-speed line and monitor signals over a low-speed line, it is possible to monitor whether or not the transmitted data of the own station has arrived at the other station. It is possible to monitor whether transmission data from a station is reliably transmitted to the other station and whether communication is being performed normally.

[Example] An example of the present invention will be described below with reference to the drawings.

Figure 1 shows the circuit configuration.
2 is a monitor device, 13 and 14 are light transmitters for optical spatial image transmission (hereinafter abbreviated as "light transmitters"), 15, 1
6 is a light receiver for optical spatial image transmission (hereinafter abbreviated as "light receiver"), and 17 and 18 are data terminal devices.

The light transmitters 13 and 14 and the light receivers 15 and 16 are devices that each transmit an image signal and an audio signal in one channel direction. In addition, the monitor devices 11 and 12
is a device that converts transmitted and received data into a data communication interface and an image signal interface, converts received data into a monitor signal, outputs it as an audio signal, and reproduces the monitor signal from the received audio data. be.

High-speed data output from the data terminal device 17 is input to the monitor device 11 via the signal line 19, and after level conversion is input to the image input terminal of the light transmitter 13 via the coaxial cable 20. The light transmitter 13 performs electrical/optical conversion on the input high-speed data and sends it to the optical space transmission line 21 as an optical signal.
The light receiver 15 optically/electrically converts the optical signal from the light transmitter 13 into original high-speed data, and then sends the data to the monitor device 12 via the coaxial cable 22 . The monitor device 12 converts the level of high-speed data and outputs it to the data terminal device 18 via the signal line 23, and converts the monitor data created via the monitor signal converter 24 into an audio signal via the audio cable 25. Input to the audio input terminal of the light transmitter 14. The light transmitter 14 performs electrical/optical conversion on the input monitor data and sends it to the light receiver 16 via the optical space transmission line 26 . The light receiver 16 performs optical/electrical conversion on the received optical signal, and then outputs it to the monitor device 11 via the audio cable 27. Monitor device 11
Now, display the input monitor data on the monitor display section 2.
8. In this way, the reception state of high-speed data output from the data terminal device 17 at the data terminal device 18 can be monitored by the monitor device 11 on the data terminal device 17 side.

Similarly, high-speed data output from the data terminal device 18 is sent to the signal line 29, the monitor device 12, the coaxial cable 30, the light transmitter 13, the optical space transmission line 31, the light receiver 16, the coaxial cable 32, the monitor device 11,
It is output to the data terminal device 17 via the signal line 33. Further, in the monitor device 11, the monitor signal converter 34 outputs the monitor data as an audio signal to the monitor device 12 via the audio cable 35, the light transmitter 13, the optical space transmission line 36, the light receiver 15, and the audio cable 37. . The monitor device 12 causes the monitor display section 38 to display the input monitor data. In this way, the reception state of high-speed data output from the data terminal device 18 at the data terminal device 17 can be monitored by the monitor device 12 on the data terminal device 18 side.
can be monitored with.

Here, the optical space transmission line is an optical space transmission line 21 and an optical space transmission line 3 from the light transmitter 13 to the light receiver 15.
6, but in actual transmission, the optical transmitter 13 combines the audio signal and the image signal and transmits them as one line, and the optical receiver 15 separates and outputs them. Even with lines, transmission is actually performed using multiplexed single line transmission. Similarly, although the explanation has been made using two lines, the optical space transmission line 26 and the optical space transmission line 31, from the light transmitter 14 to the light receiver 16, in actual transmission, the audio signal and the image signal are combined in the light transmitter 14. and transmit it as one line,
By separating and outputting the signals at the photoreceiver 16, although functionally there are two lines, transmission is actually performed using one multiplexed line.

Next, details of the monitor device 11 (12) will be explained using FIG. 2.

The figure shows the configuration of the monitor device 11. High-speed data input from the signal line 19 is level-converted by the interface converter 39, converted into a signal that can be transmitted by the image signal system, and then sent to the coaxial cable 2.
Output to 0. Further, a signal input from the image signal system of the light receiver 16 via the coaxial cable 32 is converted into high-speed interface data by the interface converter 40 and output to the signal line 33.

The signal transmitted here is as shown in Figure 3.
This is CMI encoded data, and for example, if the transmission speed is 2Mbps, the maximum repetition frequency is 2Mbps.
Hz, the lowest frequency is 1MHz, and the overall frequency varies between 1 and 2MHz.

In the monitor device 11, the interface converter 4
The high-speed data passing through 0 is frequency-divided by 1024 by the frequency dividing section 41 and outputted from the audio signal output section 42 to the audio cable 35. The signal output here is approximately 1~2KHz
This is a signal that can be transmitted satisfactorily through a normal voice band transmission path.

In addition, the signal frequency-divided in the same way by the monitor device 12 on the partner station side is transmitted to the audio cable 2 via the audio line.
7 to the audio signal input section 43. The input signal is further frequency-divided by 1024 in the frequency divider 44 to obtain a low-frequency signal with a visually visible blinking frequency, that is, about 1 to 2 Hz. LED for display with this low frequency signal
By blinking 45, the communication status can be monitored.

In addition, if the optical space transmission line is cut or the wiring cable is disconnected, the signal input to the image line and audio line will be interrupted or random noise will occur, and the LED 4 for display in case of a line abnormality will
The blinking number 5 will either stop or blink at a high speed. This allows it to be distinguished from normal times, making it possible to check the communication status.

Although the above is an explanation regarding the monitor device 11 side, the same applies to the monitor device 12 side, so the explanation thereof will be omitted.

[Effect of the invention] As described above, according to the present invention, two
In equipment that performs bidirectional high-speed data communication between points, signal transmission equipment that has one high-speed line and one low-speed line is used as the transmission equipment, and the communication data is transmitted over the high-speed line and the monitor signal is transmitted over the low-speed line. By transmitting data, it is possible to monitor whether or not the transmitted data of the own station has arrived at the other station, so there is no need for a special line for data monitoring, and monitor data can be included in the transmitted data. To avoid complicating the software response due to additional transmission, and to use simple means to reliably transmit data from one's own station to the other station and monitor whether communication is being performed normally. It is possible to provide a high-speed data communication monitoring device that can perform high-speed data communication.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention. Fig. 1 is a block diagram showing the overall configuration of the communication circuit, Fig. 2 is a block diagram showing the detailed structure of the monitor device, and Fig. 3 shows the waveform of the CMI code. FIG. 11, 12... Monitor device, 13, 14...
(For optical space transmission) Light transmitter, 15, 16... (For optical space transmission) Light receiver, 17, 18... Data terminal device, 19, 23, 29, 32, 33... Signal line,
20, 22, 30, 32...Coaxial cable, 2
1, 26, 31, 36...optical space transmission line, 24,
34...Monitor signal converter, 25, 27, 35,
37... Audio cable, 28, 38... Monitor display section, 39, 40... Interface conversion section, 4
1, 44... Frequency division section, 42... Audio signal output section,
43...Audio signal input section, 45...Display LED.

Claims (1)

[Scope of Claims] 1. In a high-speed data communication monitoring device that has one bidirectional high-speed line and one low-speed line each between two points and is capable of high-speed data communication, receiving on the high-speed line. The first frequency divides the data to a frequency that can be transmitted over a low-speed line and sends it to the low-speed line.
It is equipped with a frequency divider that divides data received over a low-speed line to a visible frequency and outputs it for display, allowing communication data to be transmitted over a high-speed line while using a low-speed line. A high-speed data communication monitor device, characterized in that it transmits a monitor signal.