JPS6365725A - Alarm transfer system - Google Patents

Abstract

PURPOSE:To transfer an alarm in a direction opposite to a direction of information flow by coupling a means supplying a fault generating signal of a transmission system with a prescribed succeeding position in the information transmission of a transmission line and coupling a means detecting a fault generating signal with the transmission line. CONSTITUTION:The control information from a terminal 115 is used to generate a prescribed DC voltage in the sending state of normal information. It is detected by a BC voltage detector at the sender side in sending the information. If the fault relating to the information transmission is detected at the reception side of information, the impressed voltage by a DC voltage generator 18 is made zero by the control from the terminal 115. The DC voltage detector 15 at the sender recognizes the occurrence of a fault from the absence of the required voltage. In this system, it is possible to send an alarm if the transmission line between the terminals 113 and 114 is disconnected or not connected.

Description

[Detailed Description of the Invention] (Industrial Application Field) Conventionally, in most systems that transmit information, as shown in Figure 2, transmission is bidirectional, and information is transmitted along the information transmission route to the device that generated the information. Alarms related to such failures are transferred through an information transmission route that is opposite to the direction of the information transmission route. This operation will be specifically explained using the same figure. In the figure, 1 is the information source (I), 2.3 is the transmission device, and 4 is the information source (I).
f), 5 to 12 are transmission lines, and 101 to 112 are terminals.

For example, if some kind of failure occurs in the transmission line 7 indicated by the
(including cases in which the electrical characteristics of the information have deteriorated by the time the information is input to the transmitter 7 and is determined to be a failure) The transmission device @3 confirms the failure and generates a necessary alarm. At this time, the transmission device 2 learns of the occurrence of an alarm via the terminal 108, the transmission line 8, and the terminal 106, and the information source (I) 1 transmits subsequent information via the terminal 104, the transmission line 6, and the terminal 102. It is possible to know that a failure has occurred at at least one location on the route.

Of course, the downstream transmission device and information source (■) 4 can also learn of the occurrence of a failure.

In recent years, there have been an increase in the number of services in which information is transmitted in one direction (unidirectional), resulting in a configuration as shown in Figures 5 and 6 (In this case, the information source (■) 4 is used only for receiving information. )
. In the figure, the same components as those of the conventional example shown in FIG. 2 are denoted by the same reference numerals.

(Problems to be solved by the invention # and C) In these systems, there is no transmission route for transmitting alarms related to failures that occur after the occurrence of the above-mentioned failures to the information source (I), and there is no separate route for transmitting alarms. It is necessary to prepare a route. Furthermore, if the transmission path to the downstream side is not connected, it cannot be known.

(Objective of the Invention) The object of the present invention is to prevent failures that occur during the transmission of information in the intermediate transmission path, transmission device, or last-most device in a transmission system in which information is transmitted in only one direction using a transmission path. It is an object of the present invention to provide a system capable of transmitting an alarm to a higher-level information source without requiring a separate transmission system for transmitting the alarm or even when a downstream transmission line is not connected.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a transmission system that performs unidirectional transmission of information using a transmission path, in which a predetermined method for transmitting information on the transmission path is provided. A means for supplying an alarm signal related to the occurrence of a failure in the transmission system to the transmission line is connected to the position via a means that does not impede the flow of transmitted information, and a predetermined position at the front is connected to the means for supplying the alarm signal to the transmission line. The present invention is characterized in that a means for detecting a fault is coupled to the transmission path through a means that does not impede the flow of transmitted information, and an alarm related to a failure occurring at a later stage in information transmission is transferred to a higher level.

(Function) According to the present invention, the alarm is transferred to the upper level by detecting the alarm signal supplied later in the transmission path at the higher level.

(Example) The present invention will be described in detail below with reference to the drawings, but the specific operation will be explained, for example, between the information source (■) 1 and the transmission device 2, and between the transmission device 2 and the transmission bag M3. The operation of transferring H information between two devices will be explained. To transfer the alarm between multiple devices, the transfer operation between the two devices may be performed sequentially.

Figure 1 shows a case where information is transmitted using an unbalanced line (for example, a coaxial cable), 13 is an output side transformer (the name is given to the information transmission operation, and the same applies hereinafter), 16 is an input transformer, 113 and 114 are output terminals and input terminals, respectively, 14.17 is a capacitor that grounds one of the two terminals for information transmission, 15 is a DC voltage detector, and 18 is a DC voltage generator. It is. In the same figure (
In a), the ground side point of the two terminals for information transmission is biased in terms of direct current, and in (b) of the same figure, the ground side point of the two terminals for information transmission is biased. This is the case when a potential difference is provided. In either case, this applied DC potential is not transmitted to the internal circuit via the transformer 13 or transformer 16. Note that 115 is an alarm control input terminal, and 116 is an alarm control output terminal.

In a normal information transmission state, a required DC voltage is generated by control information from the terminal 115. This is detected by the DC voltage detector 15 on the sending side in information transmission. If the information receiver detects a failure related to information transmission, the DC voltage generator 18 is controlled by the terminal 115.
The applied voltage is reduced to zero. Since the required voltage does not arrive, the DC voltage detector 15 on the sending side can know that a failure has occurred.

With this method, an alarm can be transmitted even when the transmission path between the terminals 113 and 114 is disconnected or disconnected.

The required operation based on the control information from the terminal 116 is as follows.
For example, information transmission may be stopped at the information source (■) 1, or if the information source (I) 1 is an exchange, the line may be disconnected.

Note that the control information of the terminal 116 in the intermediate transmission device is usually not used.

FIG. 3 shows an embodiment in which a balanced line (for example, a balanced pair cable) is used to transmit information, and the method of transmitting the alarm is the same as that in FIG. 1, so a description thereof will be omitted. In addition,
In the figure, 19 is the output side transformer, 22 is the output side transformer, 1
17.118 are output terminals, 119 and 120 are input terminals,
20. 23 is a capacitor that busses information signals, 21
24 is a DC voltage generator, 121 is an alarm control input terminal, and 122 is an alarm control output terminal.

The embodiment shown in FIG. 4 is an example using a directional coupler (a general term for elements and circuits in which the signal flow is directional as shown in the figure), and the information to be transmitted is transmitted by light, Regardless of electricity.

Here, 25.27 is a directional coupler, 26 is an alarm signal detector, 28 is an alarm signal transmitter, 28 is an alarm signal transmitter,
127 is an alarm control input terminal, and 128 is an alarm control output terminal.

In this embodiment as well, the alarm signal from the sender 28 is detected by the detector 26 and transferred as described above, but the first
Unlike the embodiments shown in FIGS.
If the directionality of alarm transmission is sufficiently ensured, even if false alarms with the same or part of the frequency components as the information are used for transmission, the transmission of the information will not be affected, and there will be a large degree of freedom in selecting the signal for alarm transmission. .

(Effects of the Invention) As explained above, according to the present invention, when information is transmitted in one direction, an alarm can be transmitted in the opposite direction to the direction of information flow, and a separate This has the advantage that it is possible to transfer information using a transmission path without providing a transmission path.

[Brief explanation of the drawing]

FIGS. 1(a) and 4(b) are conceptual diagrams of main parts of a transmission system showing an embodiment of the present invention, FIG. 2 is a conceptual diagram of a conventional bidirectional transmission system, and FIGS. 3 and 4 are conceptual diagrams of a conventional bidirectional transmission system. A conceptual diagram of main parts of a transmission system showing another embodiment, and FIGS. 5 and 6 are conceptual diagrams of a conventional unidirectional transmission system. In the diagram, 1...information? l! (I), 2.3... Transmission device, 4... Information source (II), 5.6.7.8', 9.
10゜11.12... Transmission line, 13... Output side transformer, 14... Capacitor, 15... DC voltage detector, 16... Input side transformer, 17... Capacitor, 18... ...DC voltage generator.

Claims (1)

[Claims] In a transmission system that transmits information in one direction using a transmission line, a means for supplying an alarm signal related to the occurrence of a failure in the transmission system to the transmission line is provided at a predetermined position downstream of the information transmission on the transmission line. A means for detecting the alarm signal is coupled to the transmission line via a means that does not impede the flow of transmitted information, and a means for detecting the alarm signal is coupled to the transmission path at a predetermined position in front of the transmission line through means that does not inhibit the flow of transmitted information. An alarm transfer method characterized by transferring an alarm related to a failure occurring at a later stage in transmission to a higher level.